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platform_system_core/adb/sysdeps_win32.cpp

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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define TRACE_TAG SYSDEPS
#include "sysdeps.h"
#include <winsock2.h> /* winsock.h *must* be included before windows.h. */
#include <windows.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <algorithm>
#include <memory>
#include <string>
#include <unordered_map>
#include <cutils/sockets.h>
#include <android-base/errors.h>
#include <android-base/logging.h>
#include <android-base/stringprintf.h>
#include <android-base/strings.h>
#include <android-base/utf8.h>
#include "adb.h"
extern void fatal(const char *fmt, ...);
/* forward declarations */
typedef const struct FHClassRec_* FHClass;
typedef struct FHRec_* FH;
typedef struct EventHookRec_* EventHook;
typedef struct FHClassRec_ {
void (*_fh_init)(FH);
int (*_fh_close)(FH);
int (*_fh_lseek)(FH, int, int);
int (*_fh_read)(FH, void*, int);
int (*_fh_write)(FH, const void*, int);
void (*_fh_hook)(FH, int, EventHook);
} FHClassRec;
static void _fh_file_init(FH);
static int _fh_file_close(FH);
static int _fh_file_lseek(FH, int, int);
static int _fh_file_read(FH, void*, int);
static int _fh_file_write(FH, const void*, int);
static void _fh_file_hook(FH, int, EventHook);
static const FHClassRec _fh_file_class = {
_fh_file_init,
_fh_file_close,
_fh_file_lseek,
_fh_file_read,
_fh_file_write,
_fh_file_hook
};
static void _fh_socket_init(FH);
static int _fh_socket_close(FH);
static int _fh_socket_lseek(FH, int, int);
static int _fh_socket_read(FH, void*, int);
static int _fh_socket_write(FH, const void*, int);
static void _fh_socket_hook(FH, int, EventHook);
static const FHClassRec _fh_socket_class = {
_fh_socket_init,
_fh_socket_close,
_fh_socket_lseek,
_fh_socket_read,
_fh_socket_write,
_fh_socket_hook
};
#define assert(cond) \
do { \
if (!(cond)) fatal("assertion failed '%s' on %s:%d\n", #cond, __FILE__, __LINE__); \
} while (0)
void handle_deleter::operator()(HANDLE h) {
// CreateFile() is documented to return INVALID_HANDLE_FILE on error,
// implying that NULL is a valid handle, but this is probably impossible.
// Other APIs like CreateEvent() are documented to return NULL on error,
// implying that INVALID_HANDLE_VALUE is a valid handle, but this is also
// probably impossible. Thus, consider both NULL and INVALID_HANDLE_VALUE
// as invalid handles. std::unique_ptr won't call a deleter with NULL, so we
// only need to check for INVALID_HANDLE_VALUE.
if (h != INVALID_HANDLE_VALUE) {
if (!CloseHandle(h)) {
D("CloseHandle(%p) failed: %s", h,
android::base::SystemErrorCodeToString(GetLastError()).c_str());
}
}
}
/**************************************************************************/
/**************************************************************************/
/***** *****/
/***** replaces libs/cutils/load_file.c *****/
/***** *****/
/**************************************************************************/
/**************************************************************************/
void *load_file(const char *fn, unsigned *_sz)
{
HANDLE file;
char *data;
DWORD file_size;
std::wstring fn_wide;
if (!android::base::UTF8ToWide(fn, &fn_wide))
return NULL;
file = CreateFileW( fn_wide.c_str(),
GENERIC_READ,
FILE_SHARE_READ,
NULL,
OPEN_EXISTING,
0,
NULL );
if (file == INVALID_HANDLE_VALUE)
return NULL;
file_size = GetFileSize( file, NULL );
data = NULL;
if (file_size > 0) {
data = (char*) malloc( file_size + 1 );
if (data == NULL) {
D("load_file: could not allocate %ld bytes", file_size );
file_size = 0;
} else {
DWORD out_bytes;
if ( !ReadFile( file, data, file_size, &out_bytes, NULL ) ||
out_bytes != file_size )
{
D("load_file: could not read %ld bytes from '%s'", file_size, fn);
free(data);
data = NULL;
file_size = 0;
}
}
}
CloseHandle( file );
*_sz = (unsigned) file_size;
return data;
}
/**************************************************************************/
/**************************************************************************/
/***** *****/
/***** common file descriptor handling *****/
/***** *****/
/**************************************************************************/
/**************************************************************************/
/* used to emulate unix-domain socket pairs */
typedef struct SocketPairRec_* SocketPair;
typedef struct FHRec_
{
FHClass clazz;
int used;
int eof;
union {
HANDLE handle;
SOCKET socket;
SocketPair pair;
} u;
HANDLE event;
int mask;
char name[32];
} FHRec;
#define fh_handle u.handle
#define fh_socket u.socket
#define fh_pair u.pair
#define WIN32_FH_BASE 100
#define WIN32_MAX_FHS 128
static adb_mutex_t _win32_lock;
static FHRec _win32_fhs[ WIN32_MAX_FHS ];
static int _win32_fh_next; // where to start search for free FHRec
static FH
_fh_from_int( int fd, const char* func )
{
FH f;
fd -= WIN32_FH_BASE;
if (fd < 0 || fd >= WIN32_MAX_FHS) {
D( "_fh_from_int: invalid fd %d passed to %s", fd + WIN32_FH_BASE,
func );
errno = EBADF;
return NULL;
}
f = &_win32_fhs[fd];
if (f->used == 0) {
D( "_fh_from_int: invalid fd %d passed to %s", fd + WIN32_FH_BASE,
func );
errno = EBADF;
return NULL;
}
return f;
}
static int
_fh_to_int( FH f )
{
if (f && f->used && f >= _win32_fhs && f < _win32_fhs + WIN32_MAX_FHS)
return (int)(f - _win32_fhs) + WIN32_FH_BASE;
return -1;
}
static FH
_fh_alloc( FHClass clazz )
{
FH f = NULL;
adb_mutex_lock( &_win32_lock );
// Search entire array, starting from _win32_fh_next.
for (int nn = 0; nn < WIN32_MAX_FHS; nn++) {
// Keep incrementing _win32_fh_next to avoid giving out an index that
// was recently closed, to try to avoid use-after-free.
const int index = _win32_fh_next++;
// Handle wrap-around of _win32_fh_next.
if (_win32_fh_next == WIN32_MAX_FHS) {
_win32_fh_next = 0;
}
if (_win32_fhs[index].clazz == NULL) {
f = &_win32_fhs[index];
goto Exit;
}
}
D( "_fh_alloc: no more free file descriptors" );
errno = EMFILE; // Too many open files
Exit:
if (f) {
f->clazz = clazz;
f->used = 1;
f->eof = 0;
f->name[0] = '\0';
clazz->_fh_init(f);
}
adb_mutex_unlock( &_win32_lock );
return f;
}
static int
_fh_close( FH f )
{
// Use lock so that closing only happens once and so that _fh_alloc can't
// allocate a FH that we're in the middle of closing.
adb_mutex_lock(&_win32_lock);
if (f->used) {
f->clazz->_fh_close( f );
f->name[0] = '\0';
f->eof = 0;
f->used = 0;
f->clazz = NULL;
}
adb_mutex_unlock(&_win32_lock);
return 0;
}
// Deleter for unique_fh.
class fh_deleter {
public:
void operator()(struct FHRec_* fh) {
// We're called from a destructor and destructors should not overwrite
// errno because callers may do:
// errno = EBLAH;
// return -1; // calls destructor, which should not overwrite errno
const int saved_errno = errno;
_fh_close(fh);
errno = saved_errno;
}
};
// Like std::unique_ptr, but calls _fh_close() instead of operator delete().
typedef std::unique_ptr<struct FHRec_, fh_deleter> unique_fh;
/**************************************************************************/
/**************************************************************************/
/***** *****/
/***** file-based descriptor handling *****/
/***** *****/
/**************************************************************************/
/**************************************************************************/
static void _fh_file_init( FH f ) {
f->fh_handle = INVALID_HANDLE_VALUE;
}
static int _fh_file_close( FH f ) {
CloseHandle( f->fh_handle );
f->fh_handle = INVALID_HANDLE_VALUE;
return 0;
}
static int _fh_file_read( FH f, void* buf, int len ) {
DWORD read_bytes;
if ( !ReadFile( f->fh_handle, buf, (DWORD)len, &read_bytes, NULL ) ) {
D( "adb_read: could not read %d bytes from %s", len, f->name );
errno = EIO;
return -1;
} else if (read_bytes < (DWORD)len) {
f->eof = 1;
}
return (int)read_bytes;
}
static int _fh_file_write( FH f, const void* buf, int len ) {
DWORD wrote_bytes;
if ( !WriteFile( f->fh_handle, buf, (DWORD)len, &wrote_bytes, NULL ) ) {
D( "adb_file_write: could not write %d bytes from %s", len, f->name );
errno = EIO;
return -1;
} else if (wrote_bytes < (DWORD)len) {
f->eof = 1;
}
return (int)wrote_bytes;
}
static int _fh_file_lseek( FH f, int pos, int origin ) {
DWORD method;
DWORD result;
switch (origin)
{
case SEEK_SET: method = FILE_BEGIN; break;
case SEEK_CUR: method = FILE_CURRENT; break;
case SEEK_END: method = FILE_END; break;
default:
errno = EINVAL;
return -1;
}
result = SetFilePointer( f->fh_handle, pos, NULL, method );
if (result == INVALID_SET_FILE_POINTER) {
errno = EIO;
return -1;
} else {
f->eof = 0;
}
return (int)result;
}
/**************************************************************************/
/**************************************************************************/
/***** *****/
/***** file-based descriptor handling *****/
/***** *****/
/**************************************************************************/
/**************************************************************************/
int adb_open(const char* path, int options)
{
FH f;
DWORD desiredAccess = 0;
DWORD shareMode = FILE_SHARE_READ | FILE_SHARE_WRITE;
switch (options) {
case O_RDONLY:
desiredAccess = GENERIC_READ;
break;
case O_WRONLY:
desiredAccess = GENERIC_WRITE;
break;
case O_RDWR:
desiredAccess = GENERIC_READ | GENERIC_WRITE;
break;
default:
D("adb_open: invalid options (0x%0x)", options);
errno = EINVAL;
return -1;
}
f = _fh_alloc( &_fh_file_class );
if ( !f ) {
return -1;
}
std::wstring path_wide;
if (!android::base::UTF8ToWide(path, &path_wide)) {
return -1;
}
f->fh_handle = CreateFileW( path_wide.c_str(), desiredAccess, shareMode,
NULL, OPEN_EXISTING, 0, NULL );
if ( f->fh_handle == INVALID_HANDLE_VALUE ) {
const DWORD err = GetLastError();
_fh_close(f);
D( "adb_open: could not open '%s': ", path );
switch (err) {
case ERROR_FILE_NOT_FOUND:
D( "file not found" );
errno = ENOENT;
return -1;
case ERROR_PATH_NOT_FOUND:
D( "path not found" );
errno = ENOTDIR;
return -1;
default:
D("unknown error: %s", android::base::SystemErrorCodeToString(err).c_str());
errno = ENOENT;
return -1;
}
}
snprintf( f->name, sizeof(f->name), "%d(%s)", _fh_to_int(f), path );
D( "adb_open: '%s' => fd %d", path, _fh_to_int(f) );
return _fh_to_int(f);
}
/* ignore mode on Win32 */
int adb_creat(const char* path, int mode)
{
FH f;
f = _fh_alloc( &_fh_file_class );
if ( !f ) {
return -1;
}
std::wstring path_wide;
if (!android::base::UTF8ToWide(path, &path_wide)) {
return -1;
}
f->fh_handle = CreateFileW( path_wide.c_str(), GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL,
NULL );
if ( f->fh_handle == INVALID_HANDLE_VALUE ) {
const DWORD err = GetLastError();
_fh_close(f);
D( "adb_creat: could not open '%s': ", path );
switch (err) {
case ERROR_FILE_NOT_FOUND:
D( "file not found" );
errno = ENOENT;
return -1;
case ERROR_PATH_NOT_FOUND:
D( "path not found" );
errno = ENOTDIR;
return -1;
default:
D("unknown error: %s", android::base::SystemErrorCodeToString(err).c_str());
errno = ENOENT;
return -1;
}
}
snprintf( f->name, sizeof(f->name), "%d(%s)", _fh_to_int(f), path );
D( "adb_creat: '%s' => fd %d", path, _fh_to_int(f) );
return _fh_to_int(f);
}
int adb_read(int fd, void* buf, int len)
{
FH f = _fh_from_int(fd, __func__);
if (f == NULL) {
return -1;
}
return f->clazz->_fh_read( f, buf, len );
}
int adb_write(int fd, const void* buf, int len)
{
FH f = _fh_from_int(fd, __func__);
if (f == NULL) {
return -1;
}
return f->clazz->_fh_write(f, buf, len);
}
int adb_lseek(int fd, int pos, int where)
{
FH f = _fh_from_int(fd, __func__);
if (!f) {
return -1;
}
return f->clazz->_fh_lseek(f, pos, where);
}
int adb_close(int fd)
{
FH f = _fh_from_int(fd, __func__);
if (!f) {
return -1;
}
D( "adb_close: %s", f->name);
_fh_close(f);
return 0;
}
// Overrides strerror() to handle error codes not supported by the Windows C
// Runtime (MSVCRT.DLL).
char* adb_strerror(int err) {
// sysdeps.h defines strerror to adb_strerror, but in this function, we
// want to call the real C Runtime strerror().
#pragma push_macro("strerror")
#undef strerror
const int saved_err = errno; // Save because we overwrite it later.
// Lookup the string for an unknown error.
char* errmsg = strerror(-1);
const std::string unknown_error = (errmsg == nullptr) ? "" : errmsg;
// Lookup the string for this error to see if the C Runtime has it.
errmsg = strerror(err);
if (errmsg != nullptr && unknown_error != errmsg) {
// The CRT returned an error message and it is different than the error
// message for an unknown error, so it is probably valid, so use it.
} else {
// Check if we have a string for this error code.
const char* custom_msg = nullptr;
switch (err) {
#pragma push_macro("ERR")
#undef ERR
#define ERR(errnum, desc) case errnum: custom_msg = desc; break
// These error strings are from AOSP bionic/libc/include/sys/_errdefs.h.
// Note that these cannot be longer than 94 characters because we
// pass this to _strerror() which has that requirement.
ERR(ECONNRESET, "Connection reset by peer");
ERR(EHOSTUNREACH, "No route to host");
ERR(ENETDOWN, "Network is down");
ERR(ENETRESET, "Network dropped connection because of reset");
ERR(ENOBUFS, "No buffer space available");
ERR(ENOPROTOOPT, "Protocol not available");
ERR(ENOTCONN, "Transport endpoint is not connected");
ERR(ENOTSOCK, "Socket operation on non-socket");
ERR(EOPNOTSUPP, "Operation not supported on transport endpoint");
#pragma pop_macro("ERR")
}
if (custom_msg != nullptr) {
// Use _strerror() to write our string into the writable per-thread
// buffer used by strerror()/_strerror(). _strerror() appends the
// msg for the current value of errno, so set errno to a consistent
// value for every call so that our code-path is always the same.
errno = 0;
errmsg = _strerror(custom_msg);
const size_t custom_msg_len = strlen(custom_msg);
// Just in case _strerror() returned a read-only string, check if
// the returned string starts with our custom message because that
// implies that the string is not read-only.
if ((errmsg != nullptr) &&
!strncmp(custom_msg, errmsg, custom_msg_len)) {
// _strerror() puts other text after our custom message, so
// remove that by terminating after our message.
errmsg[custom_msg_len] = '\0';
} else {
// For some reason nullptr was returned or a pointer to a
// read-only string was returned, so fallback to whatever
// strerror() can muster (probably "Unknown error" or some
// generic CRT error string).
errmsg = strerror(err);
}
} else {
// We don't have a custom message, so use whatever strerror(err)
// returned earlier.
}
}
errno = saved_err; // restore
return errmsg;
#pragma pop_macro("strerror")
}
/**************************************************************************/
/**************************************************************************/
/***** *****/
/***** socket-based file descriptors *****/
/***** *****/
/**************************************************************************/
/**************************************************************************/
#undef setsockopt
static void _socket_set_errno( const DWORD err ) {
// Because the Windows C Runtime (MSVCRT.DLL) strerror() does not support a
// lot of POSIX and socket error codes, some of the resulting error codes
// are mapped to strings by adb_strerror() above.
switch ( err ) {
case 0: errno = 0; break;
// Don't map WSAEINTR since that is only for Winsock 1.1 which we don't use.
// case WSAEINTR: errno = EINTR; break;
case WSAEFAULT: errno = EFAULT; break;
case WSAEINVAL: errno = EINVAL; break;
case WSAEMFILE: errno = EMFILE; break;
// Mapping WSAEWOULDBLOCK to EAGAIN is absolutely critical because
// non-blocking sockets can cause an error code of WSAEWOULDBLOCK and
// callers check specifically for EAGAIN.
case WSAEWOULDBLOCK: errno = EAGAIN; break;
case WSAENOTSOCK: errno = ENOTSOCK; break;
case WSAENOPROTOOPT: errno = ENOPROTOOPT; break;
case WSAEOPNOTSUPP: errno = EOPNOTSUPP; break;
case WSAENETDOWN: errno = ENETDOWN; break;
case WSAENETRESET: errno = ENETRESET; break;
// Map WSAECONNABORTED to EPIPE instead of ECONNABORTED because POSIX seems
// to use EPIPE for these situations and there are some callers that look
// for EPIPE.
case WSAECONNABORTED: errno = EPIPE; break;
case WSAECONNRESET: errno = ECONNRESET; break;
case WSAENOBUFS: errno = ENOBUFS; break;
case WSAENOTCONN: errno = ENOTCONN; break;
// Don't map WSAETIMEDOUT because we don't currently use SO_RCVTIMEO or
// SO_SNDTIMEO which would cause WSAETIMEDOUT to be returned. Future
// considerations: Reportedly send() can return zero on timeout, and POSIX
// code may expect EAGAIN instead of ETIMEDOUT on timeout.
// case WSAETIMEDOUT: errno = ETIMEDOUT; break;
case WSAEHOSTUNREACH: errno = EHOSTUNREACH; break;
default:
errno = EINVAL;
D( "_socket_set_errno: mapping Windows error code %lu to errno %d",
err, errno );
}
}
static void _fh_socket_init( FH f ) {
f->fh_socket = INVALID_SOCKET;
f->event = WSACreateEvent();
if (f->event == WSA_INVALID_EVENT) {
D("WSACreateEvent failed: %s",
android::base::SystemErrorCodeToString(WSAGetLastError()).c_str());
// _event_socket_start assumes that this field is INVALID_HANDLE_VALUE
// on failure, instead of NULL which is what Windows really returns on
// error. It might be better to change all the other code to look for
// NULL, but that is a much riskier change.
f->event = INVALID_HANDLE_VALUE;
}
f->mask = 0;
}
static int _fh_socket_close( FH f ) {
if (f->fh_socket != INVALID_SOCKET) {
/* gently tell any peer that we're closing the socket */
if (shutdown(f->fh_socket, SD_BOTH) == SOCKET_ERROR) {
// If the socket is not connected, this returns an error. We want to
// minimize logging spam, so don't log these errors for now.
#if 0
D("socket shutdown failed: %s",
android::base::SystemErrorCodeToString(WSAGetLastError()).c_str());
#endif
}
if (closesocket(f->fh_socket) == SOCKET_ERROR) {
D("closesocket failed: %s",
android::base::SystemErrorCodeToString(WSAGetLastError()).c_str());
}
f->fh_socket = INVALID_SOCKET;
}
if (f->event != NULL) {
if (!CloseHandle(f->event)) {
D("CloseHandle failed: %s",
android::base::SystemErrorCodeToString(GetLastError()).c_str());
}
f->event = NULL;
}
f->mask = 0;
return 0;
}
static int _fh_socket_lseek( FH f, int pos, int origin ) {
errno = EPIPE;
return -1;
}
static int _fh_socket_read(FH f, void* buf, int len) {
int result = recv(f->fh_socket, reinterpret_cast<char*>(buf), len, 0);
if (result == SOCKET_ERROR) {
const DWORD err = WSAGetLastError();
// WSAEWOULDBLOCK is normal with a non-blocking socket, so don't trace
// that to reduce spam and confusion.
if (err != WSAEWOULDBLOCK) {
D("recv fd %d failed: %s", _fh_to_int(f),
android::base::SystemErrorCodeToString(err).c_str());
}
_socket_set_errno(err);
result = -1;
}
return result;
}
static int _fh_socket_write(FH f, const void* buf, int len) {
int result = send(f->fh_socket, reinterpret_cast<const char*>(buf), len, 0);
if (result == SOCKET_ERROR) {
const DWORD err = WSAGetLastError();
// WSAEWOULDBLOCK is normal with a non-blocking socket, so don't trace
// that to reduce spam and confusion.
if (err != WSAEWOULDBLOCK) {
D("send fd %d failed: %s", _fh_to_int(f),
android::base::SystemErrorCodeToString(err).c_str());
}
_socket_set_errno(err);
result = -1;
} else {
// According to https://code.google.com/p/chromium/issues/detail?id=27870
// Winsock Layered Service Providers may cause this.
CHECK_LE(result, len) << "Tried to write " << len << " bytes to "
<< f->name << ", but " << result
<< " bytes reportedly written";
}
return result;
}
/**************************************************************************/
/**************************************************************************/
/***** *****/
/***** replacement for libs/cutils/socket_xxxx.c *****/
/***** *****/
/**************************************************************************/
/**************************************************************************/
#include <winsock2.h>
static int _winsock_init;
static void
_init_winsock( void )
{
// TODO: Multiple threads calling this may potentially cause multiple calls
// to WSAStartup() which offers no real benefit.
if (!_winsock_init) {
WSADATA wsaData;
int rc = WSAStartup( MAKEWORD(2,2), &wsaData);
if (rc != 0) {
fatal("adb: could not initialize Winsock: %s",
android::base::SystemErrorCodeToString(rc).c_str());
}
_winsock_init = 1;
// Note that we do not call atexit() to register WSACleanup to be called
// at normal process termination because:
// 1) When exit() is called, there are still threads actively using
// Winsock because we don't cleanly shutdown all threads, so it
// doesn't make sense to call WSACleanup() and may cause problems
// with those threads.
// 2) A deadlock can occur when exit() holds a C Runtime lock, then it
// calls WSACleanup() which tries to unload a DLL, which tries to
// grab the LoaderLock. This conflicts with the device_poll_thread
// which holds the LoaderLock because AdbWinApi.dll calls
// setupapi.dll which tries to load wintrust.dll which tries to load
// crypt32.dll which calls atexit() which tries to acquire the C
// Runtime lock that the other thread holds.
}
}
// Map a socket type to an explicit socket protocol instead of using the socket
// protocol of 0. Explicit socket protocols are used by most apps and we should
// do the same to reduce the chance of exercising uncommon code-paths that might
// have problems or that might load different Winsock service providers that
// have problems.
static int GetSocketProtocolFromSocketType(int type) {
switch (type) {
case SOCK_STREAM:
return IPPROTO_TCP;
case SOCK_DGRAM:
return IPPROTO_UDP;
default:
LOG(FATAL) << "Unknown socket type: " << type;
return 0;
}
}
int network_loopback_client(int port, int type, std::string* error) {
struct sockaddr_in addr;
SOCKET s;
unique_fh f(_fh_alloc(&_fh_socket_class));
if (!f) {
*error = strerror(errno);
return -1;
}
if (!_winsock_init)
_init_winsock();
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
s = socket(AF_INET, type, GetSocketProtocolFromSocketType(type));
if(s == INVALID_SOCKET) {
*error = android::base::StringPrintf("cannot create socket: %s",
android::base::SystemErrorCodeToString(WSAGetLastError()).c_str());
D("%s", error->c_str());
return -1;
}
f->fh_socket = s;
if(connect(s, (struct sockaddr *) &addr, sizeof(addr)) == SOCKET_ERROR) {
// Save err just in case inet_ntoa() or ntohs() changes the last error.
const DWORD err = WSAGetLastError();
*error = android::base::StringPrintf("cannot connect to %s:%u: %s",
inet_ntoa(addr.sin_addr), ntohs(addr.sin_port),
android::base::SystemErrorCodeToString(err).c_str());
D("could not connect to %s:%d: %s",
type != SOCK_STREAM ? "udp" : "tcp", port, error->c_str());
return -1;
}
const int fd = _fh_to_int(f.get());
snprintf( f->name, sizeof(f->name), "%d(lo-client:%s%d)", fd,
type != SOCK_STREAM ? "udp:" : "", port );
D( "port %d type %s => fd %d", port, type != SOCK_STREAM ? "udp" : "tcp",
fd );
f.release();
return fd;
}
#define LISTEN_BACKLOG 4
// interface_address is INADDR_LOOPBACK or INADDR_ANY.
static int _network_server(int port, int type, u_long interface_address,
std::string* error) {
struct sockaddr_in addr;
SOCKET s;
int n;
unique_fh f(_fh_alloc(&_fh_socket_class));
if (!f) {
*error = strerror(errno);
return -1;
}
if (!_winsock_init)
_init_winsock();
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = htonl(interface_address);
// TODO: Consider using dual-stack socket that can simultaneously listen on
// IPv4 and IPv6.
s = socket(AF_INET, type, GetSocketProtocolFromSocketType(type));
if (s == INVALID_SOCKET) {
*error = android::base::StringPrintf("cannot create socket: %s",
android::base::SystemErrorCodeToString(WSAGetLastError()).c_str());
D("%s", error->c_str());
return -1;
}
f->fh_socket = s;
// Note: SO_REUSEADDR on Windows allows multiple processes to bind to the
// same port, so instead use SO_EXCLUSIVEADDRUSE.
n = 1;
if (setsockopt(s, SOL_SOCKET, SO_EXCLUSIVEADDRUSE, (const char*)&n,
sizeof(n)) == SOCKET_ERROR) {
*error = android::base::StringPrintf(
"cannot set socket option SO_EXCLUSIVEADDRUSE: %s",
android::base::SystemErrorCodeToString(WSAGetLastError()).c_str());
D("%s", error->c_str());
return -1;
}
if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) == SOCKET_ERROR) {
// Save err just in case inet_ntoa() or ntohs() changes the last error.
const DWORD err = WSAGetLastError();
*error = android::base::StringPrintf("cannot bind to %s:%u: %s",
inet_ntoa(addr.sin_addr), ntohs(addr.sin_port),
android::base::SystemErrorCodeToString(err).c_str());
D("could not bind to %s:%d: %s",
type != SOCK_STREAM ? "udp" : "tcp", port, error->c_str());
return -1;
}
if (type == SOCK_STREAM) {
if (listen(s, LISTEN_BACKLOG) == SOCKET_ERROR) {
*error = android::base::StringPrintf("cannot listen on socket: %s",
android::base::SystemErrorCodeToString(WSAGetLastError()).c_str());
D("could not listen on %s:%d: %s",
type != SOCK_STREAM ? "udp" : "tcp", port, error->c_str());
return -1;
}
}
const int fd = _fh_to_int(f.get());
snprintf( f->name, sizeof(f->name), "%d(%s-server:%s%d)", fd,
interface_address == INADDR_LOOPBACK ? "lo" : "any",
type != SOCK_STREAM ? "udp:" : "", port );
D( "port %d type %s => fd %d", port, type != SOCK_STREAM ? "udp" : "tcp",
fd );
f.release();
return fd;
}
int network_loopback_server(int port, int type, std::string* error) {
return _network_server(port, type, INADDR_LOOPBACK, error);
}
int network_inaddr_any_server(int port, int type, std::string* error) {
return _network_server(port, type, INADDR_ANY, error);
}
int network_connect(const std::string& host, int port, int type, int timeout, std::string* error) {
unique_fh f(_fh_alloc(&_fh_socket_class));
if (!f) {
*error = strerror(errno);
return -1;
}
if (!_winsock_init) _init_winsock();
struct addrinfo hints;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = type;
hints.ai_protocol = GetSocketProtocolFromSocketType(type);
char port_str[16];
snprintf(port_str, sizeof(port_str), "%d", port);
struct addrinfo* addrinfo_ptr = nullptr;
#if (NTDDI_VERSION >= NTDDI_WINXPSP2) || (_WIN32_WINNT >= _WIN32_WINNT_WS03)
// TODO: When the Android SDK tools increases the Windows system
// requirements >= WinXP SP2, switch to android::base::UTF8ToWide() + GetAddrInfoW().
#else
// Otherwise, keep using getaddrinfo(), or do runtime API detection
// with GetProcAddress("GetAddrInfoW").
#endif
if (getaddrinfo(host.c_str(), port_str, &hints, &addrinfo_ptr) != 0) {
*error = android::base::StringPrintf(
"cannot resolve host '%s' and port %s: %s", host.c_str(),
port_str, android::base::SystemErrorCodeToString(WSAGetLastError()).c_str());
D("%s", error->c_str());
return -1;
}
std::unique_ptr<struct addrinfo, decltype(freeaddrinfo)*>
addrinfo(addrinfo_ptr, freeaddrinfo);
addrinfo_ptr = nullptr;
// TODO: Try all the addresses if there's more than one? This just uses
// the first. Or, could call WSAConnectByName() (Windows Vista and newer)
// which tries all addresses, takes a timeout and more.
SOCKET s = socket(addrinfo->ai_family, addrinfo->ai_socktype,
addrinfo->ai_protocol);
if(s == INVALID_SOCKET) {
*error = android::base::StringPrintf("cannot create socket: %s",
android::base::SystemErrorCodeToString(WSAGetLastError()).c_str());
D("%s", error->c_str());
return -1;
}
f->fh_socket = s;
// TODO: Implement timeouts for Windows. Seems like the default in theory
// (according to http://serverfault.com/a/671453) and in practice is 21 sec.
if(connect(s, addrinfo->ai_addr, addrinfo->ai_addrlen) == SOCKET_ERROR) {
// TODO: Use WSAAddressToString or inet_ntop on address.
*error = android::base::StringPrintf("cannot connect to %s:%s: %s",
host.c_str(), port_str,
android::base::SystemErrorCodeToString(WSAGetLastError()).c_str());
D("could not connect to %s:%s:%s: %s",
type != SOCK_STREAM ? "udp" : "tcp", host.c_str(), port_str,
error->c_str());
return -1;
}
const int fd = _fh_to_int(f.get());
snprintf( f->name, sizeof(f->name), "%d(net-client:%s%d)", fd,
type != SOCK_STREAM ? "udp:" : "", port );
D( "host '%s' port %d type %s => fd %d", host.c_str(), port,
type != SOCK_STREAM ? "udp" : "tcp", fd );
f.release();
return fd;
}
#undef accept
int adb_socket_accept(int serverfd, struct sockaddr* addr, socklen_t *addrlen)
{
FH serverfh = _fh_from_int(serverfd, __func__);
if ( !serverfh || serverfh->clazz != &_fh_socket_class ) {
D("adb_socket_accept: invalid fd %d", serverfd);
errno = EBADF;
return -1;
}
unique_fh fh(_fh_alloc( &_fh_socket_class ));
if (!fh) {
PLOG(ERROR) << "adb_socket_accept: failed to allocate accepted socket "
"descriptor";
return -1;
}
fh->fh_socket = accept( serverfh->fh_socket, addr, addrlen );
if (fh->fh_socket == INVALID_SOCKET) {
const DWORD err = WSAGetLastError();
LOG(ERROR) << "adb_socket_accept: accept on fd " << serverfd <<
" failed: " + android::base::SystemErrorCodeToString(err);
_socket_set_errno( err );
return -1;
}
const int fd = _fh_to_int(fh.get());
snprintf( fh->name, sizeof(fh->name), "%d(accept:%s)", fd, serverfh->name );
D( "adb_socket_accept on fd %d returns fd %d", serverfd, fd );
fh.release();
return fd;
}
int adb_setsockopt( int fd, int level, int optname, const void* optval, socklen_t optlen )
{
FH fh = _fh_from_int(fd, __func__);
if ( !fh || fh->clazz != &_fh_socket_class ) {
D("adb_setsockopt: invalid fd %d", fd);
errno = EBADF;
return -1;
}
// TODO: Once we can assume Windows Vista or later, if the caller is trying
// to set SOL_SOCKET, SO_SNDBUF/SO_RCVBUF, ignore it since the OS has
// auto-tuning.
int result = setsockopt( fh->fh_socket, level, optname,
reinterpret_cast<const char*>(optval), optlen );
if ( result == SOCKET_ERROR ) {
const DWORD err = WSAGetLastError();
D("adb_setsockopt: setsockopt on fd %d level %d optname %d failed: %s\n",
fd, level, optname, android::base::SystemErrorCodeToString(err).c_str());
_socket_set_errno( err );
result = -1;
}
return result;
}
int adb_shutdown(int fd)
{
FH f = _fh_from_int(fd, __func__);
if (!f || f->clazz != &_fh_socket_class) {
D("adb_shutdown: invalid fd %d", fd);
errno = EBADF;
return -1;
}
D( "adb_shutdown: %s", f->name);
if (shutdown(f->fh_socket, SD_BOTH) == SOCKET_ERROR) {
const DWORD err = WSAGetLastError();
D("socket shutdown fd %d failed: %s", fd,
android::base::SystemErrorCodeToString(err).c_str());
_socket_set_errno(err);
return -1;
}
return 0;
}
/**************************************************************************/
/**************************************************************************/
/***** *****/
/***** emulated socketpairs *****/
/***** *****/
/**************************************************************************/
/**************************************************************************/
/* we implement socketpairs directly in use space for the following reasons:
* - it avoids copying data from/to the Nt kernel
* - it allows us to implement fdevent hooks easily and cheaply, something
* that is not possible with standard Win32 pipes !!
*
* basically, we use two circular buffers, each one corresponding to a given
* direction.
*
* each buffer is implemented as two regions:
*
* region A which is (a_start,a_end)
* region B which is (0, b_end) with b_end <= a_start
*
* an empty buffer has: a_start = a_end = b_end = 0
*
* a_start is the pointer where we start reading data
* a_end is the pointer where we start writing data, unless it is BUFFER_SIZE,
* then you start writing at b_end
*
* the buffer is full when b_end == a_start && a_end == BUFFER_SIZE
*
* there is room when b_end < a_start || a_end < BUFER_SIZE
*
* when reading, a_start is incremented, it a_start meets a_end, then
* we do: a_start = 0, a_end = b_end, b_end = 0, and keep going on..
*/
#define BIP_BUFFER_SIZE 4096
#if 0
#include <stdio.h>
# define BIPD(x) D x
# define BIPDUMP bip_dump_hex
static void bip_dump_hex( const unsigned char* ptr, size_t len )
{
int nn, len2 = len;
if (len2 > 8) len2 = 8;
for (nn = 0; nn < len2; nn++)
printf("%02x", ptr[nn]);
printf(" ");
for (nn = 0; nn < len2; nn++) {
int c = ptr[nn];
if (c < 32 || c > 127)
c = '.';
printf("%c", c);
}
printf("\n");
fflush(stdout);
}
#else
# define BIPD(x) do {} while (0)
# define BIPDUMP(p,l) BIPD(p)
#endif
typedef struct BipBufferRec_
{
int a_start;
int a_end;
int b_end;
int fdin;
int fdout;
int closed;
int can_write; /* boolean */
HANDLE evt_write; /* event signaled when one can write to a buffer */
int can_read; /* boolean */
HANDLE evt_read; /* event signaled when one can read from a buffer */
CRITICAL_SECTION lock;
unsigned char buff[ BIP_BUFFER_SIZE ];
} BipBufferRec, *BipBuffer;
static void
bip_buffer_init( BipBuffer buffer )
{
D( "bit_buffer_init %p", buffer );
buffer->a_start = 0;
buffer->a_end = 0;
buffer->b_end = 0;
buffer->can_write = 1;
buffer->can_read = 0;
buffer->fdin = 0;
buffer->fdout = 0;
buffer->closed = 0;
buffer->evt_write = CreateEvent( NULL, TRUE, TRUE, NULL );
buffer->evt_read = CreateEvent( NULL, TRUE, FALSE, NULL );
InitializeCriticalSection( &buffer->lock );
}
static void
bip_buffer_close( BipBuffer bip )
{
bip->closed = 1;
if (!bip->can_read) {
SetEvent( bip->evt_read );
}
if (!bip->can_write) {
SetEvent( bip->evt_write );
}
}
static void
bip_buffer_done( BipBuffer bip )
{
BIPD(( "bip_buffer_done: %d->%d", bip->fdin, bip->fdout ));
CloseHandle( bip->evt_read );
CloseHandle( bip->evt_write );
DeleteCriticalSection( &bip->lock );
}
static int
bip_buffer_write( BipBuffer bip, const void* src, int len )
{
int avail, count = 0;
if (len <= 0)
return 0;
BIPD(( "bip_buffer_write: enter %d->%d len %d", bip->fdin, bip->fdout, len ));
BIPDUMP( src, len );
if (bip->closed) {
errno = EPIPE;
return -1;
}
EnterCriticalSection( &bip->lock );
while (!bip->can_write) {
int ret;
LeaveCriticalSection( &bip->lock );
if (bip->closed) {
errno = EPIPE;
return -1;
}
/* spinlocking here is probably unfair, but let's live with it */
ret = WaitForSingleObject( bip->evt_write, INFINITE );
if (ret != WAIT_OBJECT_0) { /* buffer probably closed */
D( "bip_buffer_write: error %d->%d WaitForSingleObject returned %d, error %ld", bip->fdin, bip->fdout, ret, GetLastError() );
return 0;
}
if (bip->closed) {
errno = EPIPE;
return -1;
}
EnterCriticalSection( &bip->lock );
}
BIPD(( "bip_buffer_write: exec %d->%d len %d", bip->fdin, bip->fdout, len ));
avail = BIP_BUFFER_SIZE - bip->a_end;
if (avail > 0)
{
/* we can append to region A */
if (avail > len)
avail = len;
memcpy( bip->buff + bip->a_end, src, avail );
src = (const char *)src + avail;
count += avail;
len -= avail;
bip->a_end += avail;
if (bip->a_end == BIP_BUFFER_SIZE && bip->a_start == 0) {
bip->can_write = 0;
ResetEvent( bip->evt_write );
goto Exit;
}
}
if (len == 0)
goto Exit;
avail = bip->a_start - bip->b_end;
assert( avail > 0 ); /* since can_write is TRUE */
if (avail > len)
avail = len;
memcpy( bip->buff + bip->b_end, src, avail );
count += avail;
bip->b_end += avail;
if (bip->b_end == bip->a_start) {
bip->can_write = 0;
ResetEvent( bip->evt_write );
}
Exit:
assert( count > 0 );
if ( !bip->can_read ) {
bip->can_read = 1;
SetEvent( bip->evt_read );
}
BIPD(( "bip_buffer_write: exit %d->%d count %d (as=%d ae=%d be=%d cw=%d cr=%d",
bip->fdin, bip->fdout, count, bip->a_start, bip->a_end, bip->b_end, bip->can_write, bip->can_read ));
LeaveCriticalSection( &bip->lock );
return count;
}
static int
bip_buffer_read( BipBuffer bip, void* dst, int len )
{
int avail, count = 0;
if (len <= 0)
return 0;
BIPD(( "bip_buffer_read: enter %d->%d len %d", bip->fdin, bip->fdout, len ));
EnterCriticalSection( &bip->lock );
while ( !bip->can_read )
{
#if 0
LeaveCriticalSection( &bip->lock );
errno = EAGAIN;
return -1;
#else
int ret;
LeaveCriticalSection( &bip->lock );
if (bip->closed) {
errno = EPIPE;
return -1;
}
ret = WaitForSingleObject( bip->evt_read, INFINITE );
if (ret != WAIT_OBJECT_0) { /* probably closed buffer */
D( "bip_buffer_read: error %d->%d WaitForSingleObject returned %d, error %ld", bip->fdin, bip->fdout, ret, GetLastError());
return 0;
}
if (bip->closed) {
errno = EPIPE;
return -1;
}
EnterCriticalSection( &bip->lock );
#endif
}
BIPD(( "bip_buffer_read: exec %d->%d len %d", bip->fdin, bip->fdout, len ));
avail = bip->a_end - bip->a_start;
assert( avail > 0 ); /* since can_read is TRUE */
if (avail > len)
avail = len;
memcpy( dst, bip->buff + bip->a_start, avail );
dst = (char *)dst + avail;
count += avail;
len -= avail;
bip->a_start += avail;
if (bip->a_start < bip->a_end)
goto Exit;
bip->a_start = 0;
bip->a_end = bip->b_end;
bip->b_end = 0;
avail = bip->a_end;
if (avail > 0) {
if (avail > len)
avail = len;
memcpy( dst, bip->buff, avail );
count += avail;
bip->a_start += avail;
if ( bip->a_start < bip->a_end )
goto Exit;
bip->a_start = bip->a_end = 0;
}
bip->can_read = 0;
ResetEvent( bip->evt_read );
Exit:
assert( count > 0 );
if (!bip->can_write ) {
bip->can_write = 1;
SetEvent( bip->evt_write );
}
BIPDUMP( (const unsigned char*)dst - count, count );
BIPD(( "bip_buffer_read: exit %d->%d count %d (as=%d ae=%d be=%d cw=%d cr=%d",
bip->fdin, bip->fdout, count, bip->a_start, bip->a_end, bip->b_end, bip->can_write, bip->can_read ));
LeaveCriticalSection( &bip->lock );
return count;
}
typedef struct SocketPairRec_
{
BipBufferRec a2b_bip;
BipBufferRec b2a_bip;
FH a_fd;
int used;
} SocketPairRec;
void _fh_socketpair_init( FH f )
{
f->fh_pair = NULL;
}
static int
_fh_socketpair_close( FH f )
{
if ( f->fh_pair ) {
SocketPair pair = f->fh_pair;
if ( f == pair->a_fd ) {
pair->a_fd = NULL;
}
bip_buffer_close( &pair->b2a_bip );
bip_buffer_close( &pair->a2b_bip );
if ( --pair->used == 0 ) {
bip_buffer_done( &pair->b2a_bip );
bip_buffer_done( &pair->a2b_bip );
free( pair );
}
f->fh_pair = NULL;
}
return 0;
}
static int
_fh_socketpair_lseek( FH f, int pos, int origin )
{
errno = ESPIPE;
return -1;
}
static int
_fh_socketpair_read( FH f, void* buf, int len )
{
SocketPair pair = f->fh_pair;
BipBuffer bip;
if (!pair)
return -1;
if ( f == pair->a_fd )
bip = &pair->b2a_bip;
else
bip = &pair->a2b_bip;
return bip_buffer_read( bip, buf, len );
}
static int
_fh_socketpair_write( FH f, const void* buf, int len )
{
SocketPair pair = f->fh_pair;
BipBuffer bip;
if (!pair)
return -1;
if ( f == pair->a_fd )
bip = &pair->a2b_bip;
else
bip = &pair->b2a_bip;
return bip_buffer_write( bip, buf, len );
}
static void _fh_socketpair_hook( FH f, int event, EventHook hook ); /* forward */
static const FHClassRec _fh_socketpair_class =
{
_fh_socketpair_init,
_fh_socketpair_close,
_fh_socketpair_lseek,
_fh_socketpair_read,
_fh_socketpair_write,
_fh_socketpair_hook
};
int adb_socketpair(int sv[2]) {
SocketPair pair;
unique_fh fa(_fh_alloc(&_fh_socketpair_class));
if (!fa) {
return -1;
}
unique_fh fb(_fh_alloc(&_fh_socketpair_class));
if (!fb) {
return -1;
}
pair = reinterpret_cast<SocketPair>(malloc(sizeof(*pair)));
if (pair == NULL) {
D("adb_socketpair: not enough memory to allocate pipes" );
return -1;
}
bip_buffer_init( &pair->a2b_bip );
bip_buffer_init( &pair->b2a_bip );
fa->fh_pair = pair;
fb->fh_pair = pair;
pair->used = 2;
pair->a_fd = fa.get();
sv[0] = _fh_to_int(fa.get());
sv[1] = _fh_to_int(fb.get());
pair->a2b_bip.fdin = sv[0];
pair->a2b_bip.fdout = sv[1];
pair->b2a_bip.fdin = sv[1];
pair->b2a_bip.fdout = sv[0];
snprintf( fa->name, sizeof(fa->name), "%d(pair:%d)", sv[0], sv[1] );
snprintf( fb->name, sizeof(fb->name), "%d(pair:%d)", sv[1], sv[0] );
D( "adb_socketpair: returns (%d, %d)", sv[0], sv[1] );
fa.release();
fb.release();
return 0;
}
/**************************************************************************/
/**************************************************************************/
/***** *****/
/***** fdevents emulation *****/
/***** *****/
/***** this is a very simple implementation, we rely on the fact *****/
/***** that ADB doesn't use FDE_ERROR. *****/
/***** *****/
/**************************************************************************/
/**************************************************************************/
#define FATAL(fmt, ...) fatal("%s: " fmt, __FUNCTION__, ##__VA_ARGS__)
#if DEBUG
static void dump_fde(fdevent *fde, const char *info)
{
fprintf(stderr,"FDE #%03d %c%c%c %s\n", fde->fd,
fde->state & FDE_READ ? 'R' : ' ',
fde->state & FDE_WRITE ? 'W' : ' ',
fde->state & FDE_ERROR ? 'E' : ' ',
info);
}
#else
#define dump_fde(fde, info) do { } while(0)
#endif
#define FDE_EVENTMASK 0x00ff
#define FDE_STATEMASK 0xff00
#define FDE_ACTIVE 0x0100
#define FDE_PENDING 0x0200
#define FDE_CREATED 0x0400
static void fdevent_plist_enqueue(fdevent *node);
static void fdevent_plist_remove(fdevent *node);
static fdevent *fdevent_plist_dequeue(void);
static fdevent list_pending = {
.next = &list_pending,
.prev = &list_pending,
};
static fdevent **fd_table = 0;
static int fd_table_max = 0;
typedef struct EventLooperRec_* EventLooper;
typedef struct EventHookRec_
{
EventHook next;
FH fh;
HANDLE h;
int wanted; /* wanted event flags */
int ready; /* ready event flags */
void* aux;
void (*prepare)( EventHook hook );
int (*start) ( EventHook hook );
void (*stop) ( EventHook hook );
int (*check) ( EventHook hook );
int (*peek) ( EventHook hook );
} EventHookRec;
static EventHook _free_hooks;
static EventHook
event_hook_alloc(FH fh) {
EventHook hook = _free_hooks;
if (hook != NULL) {
_free_hooks = hook->next;
} else {
hook = reinterpret_cast<EventHook>(malloc(sizeof(*hook)));
if (hook == NULL)
fatal( "could not allocate event hook\n" );
}
hook->next = NULL;
hook->fh = fh;
hook->wanted = 0;
hook->ready = 0;
hook->h = INVALID_HANDLE_VALUE;
hook->aux = NULL;
hook->prepare = NULL;
hook->start = NULL;
hook->stop = NULL;
hook->check = NULL;
hook->peek = NULL;
return hook;
}
static void
event_hook_free( EventHook hook )
{
hook->fh = NULL;
hook->wanted = 0;
hook->ready = 0;
hook->next = _free_hooks;
_free_hooks = hook;
}
static void
event_hook_signal( EventHook hook )
{
FH f = hook->fh;
int fd = _fh_to_int(f);
fdevent* fde = fd_table[ fd - WIN32_FH_BASE ];
if (fde != NULL && fde->fd == fd) {
if ((fde->state & FDE_PENDING) == 0) {
fde->state |= FDE_PENDING;
fdevent_plist_enqueue( fde );
}
fde->events |= hook->wanted;
}
}
#define MAX_LOOPER_HANDLES WIN32_MAX_FHS
typedef struct EventLooperRec_
{
EventHook hooks;
HANDLE htab[ MAX_LOOPER_HANDLES ];
int htab_count;
} EventLooperRec;
static EventHook*
event_looper_find_p( EventLooper looper, FH fh )
{
EventHook *pnode = &looper->hooks;
EventHook node = *pnode;
for (;;) {
if ( node == NULL || node->fh == fh )
break;
pnode = &node->next;
node = *pnode;
}
return pnode;
}
static void
event_looper_hook( EventLooper looper, int fd, int events )
{
FH f = _fh_from_int(fd, __func__);
EventHook *pnode;
EventHook node;
if (f == NULL) /* invalid arg */ {
D("event_looper_hook: invalid fd=%d", fd);
return;
}
pnode = event_looper_find_p( looper, f );
node = *pnode;
if ( node == NULL ) {
node = event_hook_alloc( f );
node->next = *pnode;
*pnode = node;
}
if ( (node->wanted & events) != events ) {
/* this should update start/stop/check/peek */
D("event_looper_hook: call hook for %d (new=%x, old=%x)",
fd, node->wanted, events);
f->clazz->_fh_hook( f, events & ~node->wanted, node );
node->wanted |= events;
} else {
D("event_looper_hook: ignoring events %x for %d wanted=%x)",
events, fd, node->wanted);
}
}
static void
event_looper_unhook( EventLooper looper, int fd, int events )
{
FH fh = _fh_from_int(fd, __func__);
EventHook *pnode = event_looper_find_p( looper, fh );
EventHook node = *pnode;
if (node != NULL) {
int events2 = events & node->wanted;
if ( events2 == 0 ) {
D( "event_looper_unhook: events %x not registered for fd %d", events, fd );
return;
}
node->wanted &= ~events2;
if (!node->wanted) {
*pnode = node->next;
event_hook_free( node );
}
}
}
/*
* A fixer for WaitForMultipleObjects on condition that there are more than 64
* handles to wait on.
*
* In cetain cases DDMS may establish more than 64 connections with ADB. For
* instance, this may happen if there are more than 64 processes running on a
* device, or there are multiple devices connected (including the emulator) with
* the combined number of running processes greater than 64. In this case using
* WaitForMultipleObjects to wait on connection events simply wouldn't cut,
* because of the API limitations (64 handles max). So, we need to provide a way
* to scale WaitForMultipleObjects to accept an arbitrary number of handles. The
* easiest (and "Microsoft recommended") way to do that would be dividing the
* handle array into chunks with the chunk size less than 64, and fire up as many
* waiting threads as there are chunks. Then each thread would wait on a chunk of
* handles, and will report back to the caller which handle has been set.
* Here is the implementation of that algorithm.
*/
/* Number of handles to wait on in each wating thread. */
#define WAIT_ALL_CHUNK_SIZE 63
/* Descriptor for a wating thread */
typedef struct WaitForAllParam {
/* A handle to an event to signal when waiting is over. This handle is shared
* accross all the waiting threads, so each waiting thread knows when any
* other thread has exited, so it can exit too. */
HANDLE main_event;
/* Upon exit from a waiting thread contains the index of the handle that has
* been signaled. The index is an absolute index of the signaled handle in
* the original array. This pointer is shared accross all the waiting threads
* and it's not guaranteed (due to a race condition) that when all the
* waiting threads exit, the value contained here would indicate the first
* handle that was signaled. This is fine, because the caller cares only
* about any handle being signaled. It doesn't care about the order, nor
* about the whole list of handles that were signaled. */
LONG volatile *signaled_index;
/* Array of handles to wait on in a waiting thread. */
HANDLE* handles;
/* Number of handles in 'handles' array to wait on. */
int handles_count;
/* Index inside the main array of the first handle in the 'handles' array. */
int first_handle_index;
/* Waiting thread handle. */
HANDLE thread;
} WaitForAllParam;
/* Waiting thread routine. */
static unsigned __stdcall
_in_waiter_thread(void* arg)
{
HANDLE wait_on[WAIT_ALL_CHUNK_SIZE + 1];
int res;
WaitForAllParam* const param = (WaitForAllParam*)arg;
/* We have to wait on the main_event in order to be notified when any of the
* sibling threads is exiting. */
wait_on[0] = param->main_event;
/* The rest of the handles go behind the main event handle. */
memcpy(wait_on + 1, param->handles, param->handles_count * sizeof(HANDLE));
res = WaitForMultipleObjects(param->handles_count + 1, wait_on, FALSE, INFINITE);
if (res > 0 && res < (param->handles_count + 1)) {
/* One of the original handles got signaled. Save its absolute index into
* the output variable. */
InterlockedCompareExchange(param->signaled_index,
res - 1L + param->first_handle_index, -1L);
}
/* Notify the caller (and the siblings) that the wait is over. */
SetEvent(param->main_event);
_endthreadex(0);
return 0;
}
/* WaitForMultipeObjects fixer routine.
* Param:
* handles Array of handles to wait on.
* handles_count Number of handles in the array.
* Return:
* (>= 0 && < handles_count) - Index of the signaled handle in the array, or
* WAIT_FAILED on an error.
*/
static int
_wait_for_all(HANDLE* handles, int handles_count)
{
WaitForAllParam* threads;
HANDLE main_event;
int chunks, chunk, remains;
/* This variable is going to be accessed by several threads at the same time,
* this is bound to fail randomly when the core is run on multi-core machines.
* To solve this, we need to do the following (1 _and_ 2):
* 1. Use the "volatile" qualifier to ensure the compiler doesn't optimize
* out the reads/writes in this function unexpectedly.
* 2. Ensure correct memory ordering. The "simple" way to do that is to wrap
* all accesses inside a critical section. But we can also use
* InterlockedCompareExchange() which always provide a full memory barrier
* on Win32.
*/
volatile LONG sig_index = -1;
/* Calculate number of chunks, and allocate thread param array. */
chunks = handles_count / WAIT_ALL_CHUNK_SIZE;
remains = handles_count % WAIT_ALL_CHUNK_SIZE;
threads = (WaitForAllParam*)malloc((chunks + (remains ? 1 : 0)) *
sizeof(WaitForAllParam));
if (threads == NULL) {
D("Unable to allocate thread array for %d handles.", handles_count);
return (int)WAIT_FAILED;
}
/* Create main event to wait on for all waiting threads. This is a "manualy
* reset" event that will remain set once it was set. */
main_event = CreateEvent(NULL, TRUE, FALSE, NULL);
if (main_event == NULL) {
D("Unable to create main event. Error: %ld", GetLastError());
free(threads);
return (int)WAIT_FAILED;
}
/*
* Initialize waiting thread parameters.
*/
for (chunk = 0; chunk < chunks; chunk++) {
threads[chunk].main_event = main_event;
threads[chunk].signaled_index = &sig_index;
threads[chunk].first_handle_index = WAIT_ALL_CHUNK_SIZE * chunk;
threads[chunk].handles = handles + threads[chunk].first_handle_index;
threads[chunk].handles_count = WAIT_ALL_CHUNK_SIZE;
}
if (remains) {
threads[chunk].main_event = main_event;
threads[chunk].signaled_index = &sig_index;
threads[chunk].first_handle_index = WAIT_ALL_CHUNK_SIZE * chunk;
threads[chunk].handles = handles + threads[chunk].first_handle_index;
threads[chunk].handles_count = remains;
chunks++;
}
/* Start the waiting threads. */
for (chunk = 0; chunk < chunks; chunk++) {
/* Note that using adb_thread_create is not appropriate here, since we
* need a handle to wait on for thread termination. */
threads[chunk].thread = (HANDLE)_beginthreadex(NULL, 0, _in_waiter_thread,
&threads[chunk], 0, NULL);
if (threads[chunk].thread == NULL) {
/* Unable to create a waiter thread. Collapse. */
D("Unable to create a waiting thread %d of %d. errno=%d",
chunk, chunks, errno);
chunks = chunk;
SetEvent(main_event);
break;
}
}
/* Wait on any of the threads to get signaled. */
WaitForSingleObject(main_event, INFINITE);
/* Wait on all the waiting threads to exit. */
for (chunk = 0; chunk < chunks; chunk++) {
WaitForSingleObject(threads[chunk].thread, INFINITE);
CloseHandle(threads[chunk].thread);
}
CloseHandle(main_event);
free(threads);
const int ret = (int)InterlockedCompareExchange(&sig_index, -1, -1);
return (ret >= 0) ? ret : (int)WAIT_FAILED;
}
static EventLooperRec win32_looper;
static void fdevent_init(void)
{
win32_looper.htab_count = 0;
win32_looper.hooks = NULL;
}
static void fdevent_connect(fdevent *fde)
{
EventLooper looper = &win32_looper;
int events = fde->state & FDE_EVENTMASK;
if (events != 0)
event_looper_hook( looper, fde->fd, events );
}
static void fdevent_disconnect(fdevent *fde)
{
EventLooper looper = &win32_looper;
int events = fde->state & FDE_EVENTMASK;
if (events != 0)
event_looper_unhook( looper, fde->fd, events );
}
static void fdevent_update(fdevent *fde, unsigned events)
{
EventLooper looper = &win32_looper;
unsigned events0 = fde->state & FDE_EVENTMASK;
if (events != events0) {
int removes = events0 & ~events;
int adds = events & ~events0;
if (removes) {
D("fdevent_update: remove %x from %d", removes, fde->fd);
event_looper_unhook( looper, fde->fd, removes );
}
if (adds) {
D("fdevent_update: add %x to %d", adds, fde->fd);
event_looper_hook ( looper, fde->fd, adds );
}
}
}
static void fdevent_process()
{
EventLooper looper = &win32_looper;
EventHook hook;
int gotone = 0;
/* if we have at least one ready hook, execute it/them */
for (hook = looper->hooks; hook; hook = hook->next) {
hook->ready = 0;
if (hook->prepare) {
hook->prepare(hook);
if (hook->ready != 0) {
event_hook_signal( hook );
gotone = 1;
}
}
}
/* nothing's ready yet, so wait for something to happen */
if (!gotone)
{
looper->htab_count = 0;
for (hook = looper->hooks; hook; hook = hook->next)
{
if (hook->start && !hook->start(hook)) {
D( "fdevent_process: error when starting a hook" );
return;
}
if (hook->h != INVALID_HANDLE_VALUE) {
int nn;
for (nn = 0; nn < looper->htab_count; nn++)
{
if ( looper->htab[nn] == hook->h )
goto DontAdd;
}
looper->htab[ looper->htab_count++ ] = hook->h;
DontAdd:
;
}
}
if (looper->htab_count == 0) {
D( "fdevent_process: nothing to wait for !!" );
return;
}
do
{
int wait_ret;
D( "adb_win32: waiting for %d events", looper->htab_count );
if (looper->htab_count > MAXIMUM_WAIT_OBJECTS) {
D("handle count %d exceeds MAXIMUM_WAIT_OBJECTS.", looper->htab_count);
wait_ret = _wait_for_all(looper->htab, looper->htab_count);
} else {
wait_ret = WaitForMultipleObjects( looper->htab_count, looper->htab, FALSE, INFINITE );
}
if (wait_ret == (int)WAIT_FAILED) {
D( "adb_win32: wait failed, error %ld", GetLastError() );
} else {
D( "adb_win32: got one (index %d)", wait_ret );
/* according to Cygwin, some objects like consoles wake up on "inappropriate" events
* like mouse movements. we need to filter these with the "check" function
*/
if ((unsigned)wait_ret < (unsigned)looper->htab_count)
{
for (hook = looper->hooks; hook; hook = hook->next)
{
if ( looper->htab[wait_ret] == hook->h &&
(!hook->check || hook->check(hook)) )
{
D( "adb_win32: signaling %s for %x", hook->fh->name, hook->ready );
event_hook_signal( hook );
gotone = 1;
break;
}
}
}
}
}
while (!gotone);
for (hook = looper->hooks; hook; hook = hook->next) {
if (hook->stop)
hook->stop( hook );
}
}
for (hook = looper->hooks; hook; hook = hook->next) {
if (hook->peek && hook->peek(hook))
event_hook_signal( hook );
}
}
static void fdevent_register(fdevent *fde)
{
int fd = fde->fd - WIN32_FH_BASE;
if(fd < 0) {
FATAL("bogus negative fd (%d)\n", fde->fd);
}
if(fd >= fd_table_max) {
int oldmax = fd_table_max;
if(fde->fd > 32000) {
FATAL("bogus huuuuge fd (%d)\n", fde->fd);
}
if(fd_table_max == 0) {
fdevent_init();
fd_table_max = 256;
}
while(fd_table_max <= fd) {
fd_table_max *= 2;
}
fd_table = reinterpret_cast<fdevent**>(realloc(fd_table, sizeof(fdevent*) * fd_table_max));
if(fd_table == 0) {
FATAL("could not expand fd_table to %d entries\n", fd_table_max);
}
memset(fd_table + oldmax, 0, sizeof(int) * (fd_table_max - oldmax));
}
fd_table[fd] = fde;
}
static void fdevent_unregister(fdevent *fde)
{
int fd = fde->fd - WIN32_FH_BASE;
if((fd < 0) || (fd >= fd_table_max)) {
FATAL("fd out of range (%d)\n", fde->fd);
}
if(fd_table[fd] != fde) {
FATAL("fd_table out of sync");
}
fd_table[fd] = 0;
if(!(fde->state & FDE_DONT_CLOSE)) {
dump_fde(fde, "close");
adb_close(fde->fd);
}
}
static void fdevent_plist_enqueue(fdevent *node)
{
fdevent *list = &list_pending;
node->next = list;
node->prev = list->prev;
node->prev->next = node;
list->prev = node;
}
static void fdevent_plist_remove(fdevent *node)
{
node->prev->next = node->next;
node->next->prev = node->prev;
node->next = 0;
node->prev = 0;
}
static fdevent *fdevent_plist_dequeue(void)
{
fdevent *list = &list_pending;
fdevent *node = list->next;
if(node == list) return 0;
list->next = node->next;
list->next->prev = list;
node->next = 0;
node->prev = 0;
return node;
}
fdevent *fdevent_create(int fd, fd_func func, void *arg)
{
fdevent *fde = (fdevent*) malloc(sizeof(fdevent));
if(fde == 0) return 0;
fdevent_install(fde, fd, func, arg);
fde->state |= FDE_CREATED;
return fde;
}
void fdevent_destroy(fdevent *fde)
{
if(fde == 0) return;
if(!(fde->state & FDE_CREATED)) {
FATAL("fde %p not created by fdevent_create()\n", fde);
}
fdevent_remove(fde);
}
void fdevent_install(fdevent *fde, int fd, fd_func func, void *arg)
{
memset(fde, 0, sizeof(fdevent));
fde->state = FDE_ACTIVE;
fde->fd = fd;
fde->func = func;
fde->arg = arg;
fdevent_register(fde);
dump_fde(fde, "connect");
fdevent_connect(fde);
fde->state |= FDE_ACTIVE;
}
void fdevent_remove(fdevent *fde)
{
if(fde->state & FDE_PENDING) {
fdevent_plist_remove(fde);
}
if(fde->state & FDE_ACTIVE) {
fdevent_disconnect(fde);
dump_fde(fde, "disconnect");
fdevent_unregister(fde);
}
fde->state = 0;
fde->events = 0;
}
void fdevent_set(fdevent *fde, unsigned events)
{
events &= FDE_EVENTMASK;
if((fde->state & FDE_EVENTMASK) == (int)events) return;
if(fde->state & FDE_ACTIVE) {
fdevent_update(fde, events);
dump_fde(fde, "update");
}
fde->state = (fde->state & FDE_STATEMASK) | events;
if(fde->state & FDE_PENDING) {
/* if we're pending, make sure
** we don't signal an event that
** is no longer wanted.
*/
fde->events &= (~events);
if(fde->events == 0) {
fdevent_plist_remove(fde);
fde->state &= (~FDE_PENDING);
}
}
}
void fdevent_add(fdevent *fde, unsigned events)
{
fdevent_set(
fde, (fde->state & FDE_EVENTMASK) | (events & FDE_EVENTMASK));
}
void fdevent_del(fdevent *fde, unsigned events)
{
fdevent_set(
fde, (fde->state & FDE_EVENTMASK) & (~(events & FDE_EVENTMASK)));
}
void fdevent_loop()
{
fdevent *fde;
for(;;) {
#if DEBUG
fprintf(stderr,"--- ---- waiting for events\n");
#endif
fdevent_process();
while((fde = fdevent_plist_dequeue())) {
unsigned events = fde->events;
fde->events = 0;
fde->state &= (~FDE_PENDING);
dump_fde(fde, "callback");
fde->func(fde->fd, events, fde->arg);
}
}
}
/** FILE EVENT HOOKS
**/
static void _event_file_prepare( EventHook hook )
{
if (hook->wanted & (FDE_READ|FDE_WRITE)) {
/* we can always read/write */
hook->ready |= hook->wanted & (FDE_READ|FDE_WRITE);
}
}
static int _event_file_peek( EventHook hook )
{
return (hook->wanted & (FDE_READ|FDE_WRITE));
}
static void _fh_file_hook( FH f, int events, EventHook hook )
{
hook->h = f->fh_handle;
hook->prepare = _event_file_prepare;
hook->peek = _event_file_peek;
}
/** SOCKET EVENT HOOKS
**/
static void _event_socket_verify( EventHook hook, WSANETWORKEVENTS* evts )
{
if ( evts->lNetworkEvents & (FD_READ|FD_ACCEPT|FD_CLOSE) ) {
if (hook->wanted & FDE_READ)
hook->ready |= FDE_READ;
if ((evts->iErrorCode[FD_READ] != 0) && hook->wanted & FDE_ERROR)
hook->ready |= FDE_ERROR;
}
if ( evts->lNetworkEvents & (FD_WRITE|FD_CONNECT|FD_CLOSE) ) {
if (hook->wanted & FDE_WRITE)
hook->ready |= FDE_WRITE;
if ((evts->iErrorCode[FD_WRITE] != 0) && hook->wanted & FDE_ERROR)
hook->ready |= FDE_ERROR;
}
if ( evts->lNetworkEvents & FD_OOB ) {
if (hook->wanted & FDE_ERROR)
hook->ready |= FDE_ERROR;
}
}
static void _event_socket_prepare( EventHook hook )
{
WSANETWORKEVENTS evts;
/* look if some of the events we want already happened ? */
if (!WSAEnumNetworkEvents( hook->fh->fh_socket, NULL, &evts ))
_event_socket_verify( hook, &evts );
}
static int _socket_wanted_to_flags( int wanted )
{
int flags = 0;
if (wanted & FDE_READ)
flags |= FD_READ | FD_ACCEPT | FD_CLOSE;
if (wanted & FDE_WRITE)
flags |= FD_WRITE | FD_CONNECT | FD_CLOSE;
if (wanted & FDE_ERROR)
flags |= FD_OOB;
return flags;
}
static int _event_socket_start( EventHook hook )
{
/* create an event which we're going to wait for */
FH fh = hook->fh;
long flags = _socket_wanted_to_flags( hook->wanted );
hook->h = fh->event;
if (hook->h == INVALID_HANDLE_VALUE) {
D( "_event_socket_start: no event for %s", fh->name );
return 0;
}
if ( flags != fh->mask ) {
D( "_event_socket_start: hooking %s for %x (flags %ld)", hook->fh->name, hook->wanted, flags );
if ( WSAEventSelect( fh->fh_socket, hook->h, flags ) ) {
D( "_event_socket_start: WSAEventSelect() for %s failed, error %d", hook->fh->name, WSAGetLastError() );
CloseHandle( hook->h );
hook->h = INVALID_HANDLE_VALUE;
exit(1);
return 0;
}
fh->mask = flags;
}
return 1;
}
static void _event_socket_stop( EventHook hook )
{
hook->h = INVALID_HANDLE_VALUE;
}
static int _event_socket_check( EventHook hook )
{
int result = 0;
FH fh = hook->fh;
WSANETWORKEVENTS evts;
if (!WSAEnumNetworkEvents( fh->fh_socket, hook->h, &evts ) ) {
_event_socket_verify( hook, &evts );
result = (hook->ready != 0);
if (result) {
ResetEvent( hook->h );
}
}
D( "_event_socket_check %s returns %d", fh->name, result );
return result;
}
static int _event_socket_peek( EventHook hook )
{
WSANETWORKEVENTS evts;
FH fh = hook->fh;
/* look if some of the events we want already happened ? */
if (!WSAEnumNetworkEvents( fh->fh_socket, NULL, &evts )) {
_event_socket_verify( hook, &evts );
if (hook->ready)
ResetEvent( hook->h );
}
return hook->ready != 0;
}
static void _fh_socket_hook( FH f, int events, EventHook hook )
{
hook->prepare = _event_socket_prepare;
hook->start = _event_socket_start;
hook->stop = _event_socket_stop;
hook->check = _event_socket_check;
hook->peek = _event_socket_peek;
// TODO: check return value?
_event_socket_start( hook );
}
/** SOCKETPAIR EVENT HOOKS
**/
static void _event_socketpair_prepare( EventHook hook )
{
FH fh = hook->fh;
SocketPair pair = fh->fh_pair;
BipBuffer rbip = (pair->a_fd == fh) ? &pair->b2a_bip : &pair->a2b_bip;
BipBuffer wbip = (pair->a_fd == fh) ? &pair->a2b_bip : &pair->b2a_bip;
if (hook->wanted & FDE_READ && rbip->can_read)
hook->ready |= FDE_READ;
if (hook->wanted & FDE_WRITE && wbip->can_write)
hook->ready |= FDE_WRITE;
}
static int _event_socketpair_start( EventHook hook )
{
FH fh = hook->fh;
SocketPair pair = fh->fh_pair;
BipBuffer rbip = (pair->a_fd == fh) ? &pair->b2a_bip : &pair->a2b_bip;
BipBuffer wbip = (pair->a_fd == fh) ? &pair->a2b_bip : &pair->b2a_bip;
if (hook->wanted == FDE_READ)
hook->h = rbip->evt_read;
else if (hook->wanted == FDE_WRITE)
hook->h = wbip->evt_write;
else {
D("_event_socketpair_start: can't handle FDE_READ+FDE_WRITE" );
return 0;
}
D( "_event_socketpair_start: hook %s for %x wanted=%x",
hook->fh->name, _fh_to_int(fh), hook->wanted);
return 1;
}
static int _event_socketpair_peek( EventHook hook )
{
_event_socketpair_prepare( hook );
return hook->ready != 0;
}
static void _fh_socketpair_hook( FH fh, int events, EventHook hook )
{
hook->prepare = _event_socketpair_prepare;
hook->start = _event_socketpair_start;
hook->peek = _event_socketpair_peek;
}
static adb_mutex_t g_console_output_buffer_lock;
void
adb_sysdeps_init( void )
{
#define ADB_MUTEX(x) InitializeCriticalSection( & x );
#include "mutex_list.h"
InitializeCriticalSection( &_win32_lock );
InitializeCriticalSection( &g_console_output_buffer_lock );
}
/**************************************************************************/
/**************************************************************************/
/***** *****/
/***** Console Window Terminal Emulation *****/
/***** *****/
/**************************************************************************/
/**************************************************************************/
// This reads input from a Win32 console window and translates it into Unix
// terminal-style sequences. This emulates mostly Gnome Terminal (in Normal
// mode, not Application mode), which itself emulates xterm. Gnome Terminal
// is emulated instead of xterm because it is probably more popular than xterm:
// Ubuntu's default Ctrl-Alt-T shortcut opens Gnome Terminal, Gnome Terminal
// supports modern fonts, etc. It seems best to emulate the terminal that most
// Android developers use because they'll fix apps (the shell, etc.) to keep
// working with that terminal's emulation.
//
// The point of this emulation is not to be perfect or to solve all issues with
// console windows on Windows, but to be better than the original code which
// just called read() (which called ReadFile(), which called ReadConsoleA())
// which did not support Ctrl-C, tab completion, shell input line editing
// keys, server echo, and more.
//
// This implementation reconfigures the console with SetConsoleMode(), then
// calls ReadConsoleInput() to get raw input which it remaps to Unix
// terminal-style sequences which is returned via unix_read() which is used
// by the 'adb shell' command.
//
// Code organization:
//
// * _get_console_handle() and unix_isatty() provide console information.
// * stdin_raw_init() and stdin_raw_restore() reconfigure the console.
// * unix_read() detects console windows (as opposed to pipes, files, etc.).
// * _console_read() is the main code of the emulation.
// Returns a console HANDLE if |fd| is a console, otherwise returns nullptr.
// If a valid HANDLE is returned and |mode| is not null, |mode| is also filled
// with the console mode. Requires GENERIC_READ access to the underlying HANDLE.
static HANDLE _get_console_handle(int fd, DWORD* mode=nullptr) {
// First check isatty(); this is very fast and eliminates most non-console
// FDs, but returns 1 for both consoles and character devices like NUL.
#pragma push_macro("isatty")
#undef isatty
if (!isatty(fd)) {
return nullptr;
}
#pragma pop_macro("isatty")
// To differentiate between character devices and consoles we need to get
// the underlying HANDLE and use GetConsoleMode(), which is what requires
// GENERIC_READ permissions.
const intptr_t intptr_handle = _get_osfhandle(fd);
if (intptr_handle == -1) {
return nullptr;
}
const HANDLE handle = reinterpret_cast<const HANDLE>(intptr_handle);
DWORD temp_mode = 0;
if (!GetConsoleMode(handle, mode ? mode : &temp_mode)) {
return nullptr;
}
return handle;
}
// Returns a console handle if |stream| is a console, otherwise returns nullptr.
static HANDLE _get_console_handle(FILE* const stream) {
// Save and restore errno to make it easier for callers to prevent from overwriting errno.
android::base::ErrnoRestorer er;
const int fd = fileno(stream);
if (fd < 0) {
return nullptr;
}
return _get_console_handle(fd);
}
int unix_isatty(int fd) {
return _get_console_handle(fd) ? 1 : 0;
}
// Get the next KEY_EVENT_RECORD that should be processed.
static bool _get_key_event_record(const HANDLE console, INPUT_RECORD* const input_record) {
for (;;) {
DWORD read_count = 0;
memset(input_record, 0, sizeof(*input_record));
if (!ReadConsoleInputA(console, input_record, 1, &read_count)) {
D("_get_key_event_record: ReadConsoleInputA() failed: %s\n",
android::base::SystemErrorCodeToString(GetLastError()).c_str());
errno = EIO;
return false;
}
if (read_count == 0) { // should be impossible
fatal("ReadConsoleInputA returned 0");
}
if (read_count != 1) { // should be impossible
fatal("ReadConsoleInputA did not return one input record");
}
// If the console window is resized, emulate SIGWINCH by breaking out
// of read() with errno == EINTR. Note that there is no event on
// vertical resize because we don't give the console our own custom
// screen buffer (with CreateConsoleScreenBuffer() +
// SetConsoleActiveScreenBuffer()). Instead, we use the default which
// supports scrollback, but doesn't seem to raise an event for vertical
// window resize.
if (input_record->EventType == WINDOW_BUFFER_SIZE_EVENT) {
errno = EINTR;
return false;
}
if ((input_record->EventType == KEY_EVENT) &&
(input_record->Event.KeyEvent.bKeyDown)) {
if (input_record->Event.KeyEvent.wRepeatCount == 0) {
fatal("ReadConsoleInputA returned a key event with zero repeat"
" count");
}
// Got an interesting INPUT_RECORD, so return
return true;
}
}
}
static __inline__ bool _is_shift_pressed(const DWORD control_key_state) {
return (control_key_state & SHIFT_PRESSED) != 0;
}
static __inline__ bool _is_ctrl_pressed(const DWORD control_key_state) {
return (control_key_state & (LEFT_CTRL_PRESSED | RIGHT_CTRL_PRESSED)) != 0;
}
static __inline__ bool _is_alt_pressed(const DWORD control_key_state) {
return (control_key_state & (LEFT_ALT_PRESSED | RIGHT_ALT_PRESSED)) != 0;
}
static __inline__ bool _is_numlock_on(const DWORD control_key_state) {
return (control_key_state & NUMLOCK_ON) != 0;
}
static __inline__ bool _is_capslock_on(const DWORD control_key_state) {
return (control_key_state & CAPSLOCK_ON) != 0;
}
static __inline__ bool _is_enhanced_key(const DWORD control_key_state) {
return (control_key_state & ENHANCED_KEY) != 0;
}
// Constants from MSDN for ToAscii().
static const BYTE TOASCII_KEY_OFF = 0x00;
static const BYTE TOASCII_KEY_DOWN = 0x80;
static const BYTE TOASCII_KEY_TOGGLED_ON = 0x01; // for CapsLock
// Given a key event, ignore a modifier key and return the character that was
// entered without the modifier. Writes to *ch and returns the number of bytes
// written.
static size_t _get_char_ignoring_modifier(char* const ch,
const KEY_EVENT_RECORD* const key_event, const DWORD control_key_state,
const WORD modifier) {
// If there is no character from Windows, try ignoring the specified
// modifier and look for a character. Note that if AltGr is being used,
// there will be a character from Windows.
if (key_event->uChar.AsciiChar == '\0') {
// Note that we read the control key state from the passed in argument
// instead of from key_event since the argument has been normalized.
if (((modifier == VK_SHIFT) &&
_is_shift_pressed(control_key_state)) ||
((modifier == VK_CONTROL) &&
_is_ctrl_pressed(control_key_state)) ||
((modifier == VK_MENU) && _is_alt_pressed(control_key_state))) {
BYTE key_state[256] = {0};
key_state[VK_SHIFT] = _is_shift_pressed(control_key_state) ?
TOASCII_KEY_DOWN : TOASCII_KEY_OFF;
key_state[VK_CONTROL] = _is_ctrl_pressed(control_key_state) ?
TOASCII_KEY_DOWN : TOASCII_KEY_OFF;
key_state[VK_MENU] = _is_alt_pressed(control_key_state) ?
TOASCII_KEY_DOWN : TOASCII_KEY_OFF;
key_state[VK_CAPITAL] = _is_capslock_on(control_key_state) ?
TOASCII_KEY_TOGGLED_ON : TOASCII_KEY_OFF;
// cause this modifier to be ignored
key_state[modifier] = TOASCII_KEY_OFF;
WORD translated = 0;
if (ToAscii(key_event->wVirtualKeyCode,
key_event->wVirtualScanCode, key_state, &translated, 0) == 1) {
// Ignoring the modifier, we found a character.
*ch = (CHAR)translated;
return 1;
}
}
}
// Just use whatever Windows told us originally.
*ch = key_event->uChar.AsciiChar;
// If the character from Windows is NULL, return a size of zero.
return (*ch == '\0') ? 0 : 1;
}
// If a Ctrl key is pressed, lookup the character, ignoring the Ctrl key,
// but taking into account the shift key. This is because for a sequence like
// Ctrl-Alt-0, we want to find the character '0' and for Ctrl-Alt-Shift-0,
// we want to find the character ')'.
//
// Note that Windows doesn't seem to pass bKeyDown for Ctrl-Shift-NoAlt-0
// because it is the default key-sequence to switch the input language.
// This is configurable in the Region and Language control panel.
static __inline__ size_t _get_non_control_char(char* const ch,
const KEY_EVENT_RECORD* const key_event, const DWORD control_key_state) {
return _get_char_ignoring_modifier(ch, key_event, control_key_state,
VK_CONTROL);
}
// Get without Alt.
static __inline__ size_t _get_non_alt_char(char* const ch,
const KEY_EVENT_RECORD* const key_event, const DWORD control_key_state) {
return _get_char_ignoring_modifier(ch, key_event, control_key_state,
VK_MENU);
}
// Ignore the control key, find the character from Windows, and apply any
// Control key mappings (for example, Ctrl-2 is a NULL character). Writes to
// *pch and returns number of bytes written.
static size_t _get_control_character(char* const pch,
const KEY_EVENT_RECORD* const key_event, const DWORD control_key_state) {
const size_t len = _get_non_control_char(pch, key_event,
control_key_state);
if ((len == 1) && _is_ctrl_pressed(control_key_state)) {
char ch = *pch;
switch (ch) {
case '2':
case '@':
case '`':
ch = '\0';
break;
case '3':
case '[':
case '{':
ch = '\x1b';
break;
case '4':
case '\\':
case '|':
ch = '\x1c';
break;
case '5':
case ']':
case '}':
ch = '\x1d';
break;
case '6':
case '^':
case '~':
ch = '\x1e';
break;
case '7':
case '-':
case '_':
ch = '\x1f';
break;
case '8':
ch = '\x7f';
break;
case '/':
if (!_is_alt_pressed(control_key_state)) {
ch = '\x1f';
}
break;
case '?':
if (!_is_alt_pressed(control_key_state)) {
ch = '\x7f';
}
break;
}
*pch = ch;
}
return len;
}
static DWORD _normalize_altgr_control_key_state(
const KEY_EVENT_RECORD* const key_event) {
DWORD control_key_state = key_event->dwControlKeyState;
// If we're in an AltGr situation where the AltGr key is down (depending on
// the keyboard layout, that might be the physical right alt key which
// produces a control_key_state where Right-Alt and Left-Ctrl are down) or
// AltGr-equivalent keys are down (any Ctrl key + any Alt key), and we have
// a character (which indicates that there was an AltGr mapping), then act
// as if alt and control are not really down for the purposes of modifiers.
// This makes it so that if the user with, say, a German keyboard layout
// presses AltGr-] (which we see as Right-Alt + Left-Ctrl + key), we just
// output the key and we don't see the Alt and Ctrl keys.
if (_is_ctrl_pressed(control_key_state) &&
_is_alt_pressed(control_key_state)
&& (key_event->uChar.AsciiChar != '\0')) {
// Try to remove as few bits as possible to improve our chances of
// detecting combinations like Left-Alt + AltGr, Right-Ctrl + AltGr, or
// Left-Alt + Right-Ctrl + AltGr.
if ((control_key_state & RIGHT_ALT_PRESSED) != 0) {
// Remove Right-Alt.
control_key_state &= ~RIGHT_ALT_PRESSED;
// If uChar is set, a Ctrl key is pressed, and Right-Alt is
// pressed, Left-Ctrl is almost always set, except if the user
// presses Right-Ctrl, then AltGr (in that specific order) for
// whatever reason. At any rate, make sure the bit is not set.
control_key_state &= ~LEFT_CTRL_PRESSED;
} else if ((control_key_state & LEFT_ALT_PRESSED) != 0) {
// Remove Left-Alt.
control_key_state &= ~LEFT_ALT_PRESSED;
// Whichever Ctrl key is down, remove it from the state. We only
// remove one key, to improve our chances of detecting the
// corner-case of Left-Ctrl + Left-Alt + Right-Ctrl.
if ((control_key_state & LEFT_CTRL_PRESSED) != 0) {
// Remove Left-Ctrl.
control_key_state &= ~LEFT_CTRL_PRESSED;
} else if ((control_key_state & RIGHT_CTRL_PRESSED) != 0) {
// Remove Right-Ctrl.
control_key_state &= ~RIGHT_CTRL_PRESSED;
}
}
// Note that this logic isn't 100% perfect because Windows doesn't
// allow us to detect all combinations because a physical AltGr key
// press shows up as two bits, plus some combinations are ambiguous
// about what is actually physically pressed.
}
return control_key_state;
}
// If NumLock is on and Shift is pressed, SHIFT_PRESSED is not set in
// dwControlKeyState for the following keypad keys: period, 0-9. If we detect
// this scenario, set the SHIFT_PRESSED bit so we can add modifiers
// appropriately.
static DWORD _normalize_keypad_control_key_state(const WORD vk,
const DWORD control_key_state) {
if (!_is_numlock_on(control_key_state)) {
return control_key_state;
}
if (!_is_enhanced_key(control_key_state)) {
switch (vk) {
case VK_INSERT: // 0
case VK_DELETE: // .
case VK_END: // 1
case VK_DOWN: // 2
case VK_NEXT: // 3
case VK_LEFT: // 4
case VK_CLEAR: // 5
case VK_RIGHT: // 6
case VK_HOME: // 7
case VK_UP: // 8
case VK_PRIOR: // 9
return control_key_state | SHIFT_PRESSED;
}
}
return control_key_state;
}
static const char* _get_keypad_sequence(const DWORD control_key_state,
const char* const normal, const char* const shifted) {
if (_is_shift_pressed(control_key_state)) {
// Shift is pressed and NumLock is off
return shifted;
} else {
// Shift is not pressed and NumLock is off, or,
// Shift is pressed and NumLock is on, in which case we want the
// NumLock and Shift to neutralize each other, thus, we want the normal
// sequence.
return normal;
}
// If Shift is not pressed and NumLock is on, a different virtual key code
// is returned by Windows, which can be taken care of by a different case
// statement in _console_read().
}
// Write sequence to buf and return the number of bytes written.
static size_t _get_modifier_sequence(char* const buf, const WORD vk,
DWORD control_key_state, const char* const normal) {
// Copy the base sequence into buf.
const size_t len = strlen(normal);
memcpy(buf, normal, len);
int code = 0;
control_key_state = _normalize_keypad_control_key_state(vk,
control_key_state);
if (_is_shift_pressed(control_key_state)) {
code |= 0x1;
}
if (_is_alt_pressed(control_key_state)) { // any alt key pressed
code |= 0x2;
}
if (_is_ctrl_pressed(control_key_state)) { // any control key pressed
code |= 0x4;
}
// If some modifier was held down, then we need to insert the modifier code
if (code != 0) {
if (len == 0) {
// Should be impossible because caller should pass a string of
// non-zero length.
return 0;
}
size_t index = len - 1;
const char lastChar = buf[index];
if (lastChar != '~') {
buf[index++] = '1';
}
buf[index++] = ';'; // modifier separator
// 2 = shift, 3 = alt, 4 = shift & alt, 5 = control,
// 6 = shift & control, 7 = alt & control, 8 = shift & alt & control
buf[index++] = '1' + code;
buf[index++] = lastChar; // move ~ (or other last char) to the end
return index;
}
return len;
}
// Write sequence to buf and return the number of bytes written.
static size_t _get_modifier_keypad_sequence(char* const buf, const WORD vk,
const DWORD control_key_state, const char* const normal,
const char shifted) {
if (_is_shift_pressed(control_key_state)) {
// Shift is pressed and NumLock is off
if (shifted != '\0') {
buf[0] = shifted;
return sizeof(buf[0]);
} else {
return 0;
}
} else {
// Shift is not pressed and NumLock is off, or,
// Shift is pressed and NumLock is on, in which case we want the
// NumLock and Shift to neutralize each other, thus, we want the normal
// sequence.
return _get_modifier_sequence(buf, vk, control_key_state, normal);
}
// If Shift is not pressed and NumLock is on, a different virtual key code
// is returned by Windows, which can be taken care of by a different case
// statement in _console_read().
}
// The decimal key on the keypad produces a '.' for U.S. English and a ',' for
// Standard German. Figure this out at runtime so we know what to output for
// Shift-VK_DELETE.
static char _get_decimal_char() {
return (char)MapVirtualKeyA(VK_DECIMAL, MAPVK_VK_TO_CHAR);
}
// Prefix the len bytes in buf with the escape character, and then return the
// new buffer length.
size_t _escape_prefix(char* const buf, const size_t len) {
// If nothing to prefix, don't do anything. We might be called with
// len == 0, if alt was held down with a dead key which produced nothing.
if (len == 0) {
return 0;
}
memmove(&buf[1], buf, len);
buf[0] = '\x1b';
return len + 1;
}
// Internal buffer to satisfy future _console_read() calls.
static auto& g_console_input_buffer = *new std::vector<char>();
// Writes to buffer buf (of length len), returning number of bytes written or -1 on error. Never
// returns zero on console closure because Win32 consoles are never 'closed' (as far as I can tell).
static int _console_read(const HANDLE console, void* buf, size_t len) {
for (;;) {
// Read of zero bytes should not block waiting for something from the console.
if (len == 0) {
return 0;
}
// Flush as much as possible from input buffer.
if (!g_console_input_buffer.empty()) {
const int bytes_read = std::min(len, g_console_input_buffer.size());
memcpy(buf, g_console_input_buffer.data(), bytes_read);
const auto begin = g_console_input_buffer.begin();
g_console_input_buffer.erase(begin, begin + bytes_read);
return bytes_read;
}
// Read from the actual console. This may block until input.
INPUT_RECORD input_record;
if (!_get_key_event_record(console, &input_record)) {
return -1;
}
KEY_EVENT_RECORD* const key_event = &input_record.Event.KeyEvent;
const WORD vk = key_event->wVirtualKeyCode;
const CHAR ch = key_event->uChar.AsciiChar;
const DWORD control_key_state = _normalize_altgr_control_key_state(
key_event);
// The following emulation code should write the output sequence to
// either seqstr or to seqbuf and seqbuflen.
const char* seqstr = NULL; // NULL terminated C-string
// Enough space for max sequence string below, plus modifiers and/or
// escape prefix.
char seqbuf[16];
size_t seqbuflen = 0; // Space used in seqbuf.
#define MATCH(vk, normal) \
case (vk): \
{ \
seqstr = (normal); \
} \
break;
// Modifier keys should affect the output sequence.
#define MATCH_MODIFIER(vk, normal) \
case (vk): \
{ \
seqbuflen = _get_modifier_sequence(seqbuf, (vk), \
control_key_state, (normal)); \
} \
break;
// The shift key should affect the output sequence.
#define MATCH_KEYPAD(vk, normal, shifted) \
case (vk): \
{ \
seqstr = _get_keypad_sequence(control_key_state, (normal), \
(shifted)); \
} \
break;
// The shift key and other modifier keys should affect the output
// sequence.
#define MATCH_MODIFIER_KEYPAD(vk, normal, shifted) \
case (vk): \
{ \
seqbuflen = _get_modifier_keypad_sequence(seqbuf, (vk), \
control_key_state, (normal), (shifted)); \
} \
break;
#define ESC "\x1b"
#define CSI ESC "["
#define SS3 ESC "O"
// Only support normal mode, not application mode.
// Enhanced keys:
// * 6-pack: insert, delete, home, end, page up, page down
// * cursor keys: up, down, right, left
// * keypad: divide, enter
// * Undocumented: VK_PAUSE (Ctrl-NumLock), VK_SNAPSHOT,
// VK_CANCEL (Ctrl-Pause/Break), VK_NUMLOCK
if (_is_enhanced_key(control_key_state)) {
switch (vk) {
case VK_RETURN: // Enter key on keypad
if (_is_ctrl_pressed(control_key_state)) {
seqstr = "\n";
} else {
seqstr = "\r";
}
break;
MATCH_MODIFIER(VK_PRIOR, CSI "5~"); // Page Up
MATCH_MODIFIER(VK_NEXT, CSI "6~"); // Page Down
// gnome-terminal currently sends SS3 "F" and SS3 "H", but that
// will be fixed soon to match xterm which sends CSI "F" and
// CSI "H". https://bugzilla.redhat.com/show_bug.cgi?id=1119764
MATCH(VK_END, CSI "F");
MATCH(VK_HOME, CSI "H");
MATCH_MODIFIER(VK_LEFT, CSI "D");
MATCH_MODIFIER(VK_UP, CSI "A");
MATCH_MODIFIER(VK_RIGHT, CSI "C");
MATCH_MODIFIER(VK_DOWN, CSI "B");
MATCH_MODIFIER(VK_INSERT, CSI "2~");
MATCH_MODIFIER(VK_DELETE, CSI "3~");
MATCH(VK_DIVIDE, "/");
}
} else { // Non-enhanced keys:
switch (vk) {
case VK_BACK: // backspace
if (_is_alt_pressed(control_key_state)) {
seqstr = ESC "\x7f";
} else {
seqstr = "\x7f";
}
break;
case VK_TAB:
if (_is_shift_pressed(control_key_state)) {
seqstr = CSI "Z";
} else {
seqstr = "\t";
}
break;
// Number 5 key in keypad when NumLock is off, or if NumLock is
// on and Shift is down.
MATCH_KEYPAD(VK_CLEAR, CSI "E", "5");
case VK_RETURN: // Enter key on main keyboard
if (_is_alt_pressed(control_key_state)) {
seqstr = ESC "\n";
} else if (_is_ctrl_pressed(control_key_state)) {
seqstr = "\n";
} else {
seqstr = "\r";
}
break;
// VK_ESCAPE: Don't do any special handling. The OS uses many
// of the sequences with Escape and many of the remaining
// sequences don't produce bKeyDown messages, only !bKeyDown
// for whatever reason.
case VK_SPACE:
if (_is_alt_pressed(control_key_state)) {
seqstr = ESC " ";
} else if (_is_ctrl_pressed(control_key_state)) {
seqbuf[0] = '\0'; // NULL char
seqbuflen = 1;
} else {
seqstr = " ";
}
break;
MATCH_MODIFIER_KEYPAD(VK_PRIOR, CSI "5~", '9'); // Page Up
MATCH_MODIFIER_KEYPAD(VK_NEXT, CSI "6~", '3'); // Page Down
MATCH_KEYPAD(VK_END, CSI "4~", "1");
MATCH_KEYPAD(VK_HOME, CSI "1~", "7");
MATCH_MODIFIER_KEYPAD(VK_LEFT, CSI "D", '4');
MATCH_MODIFIER_KEYPAD(VK_UP, CSI "A", '8');
MATCH_MODIFIER_KEYPAD(VK_RIGHT, CSI "C", '6');
MATCH_MODIFIER_KEYPAD(VK_DOWN, CSI "B", '2');
MATCH_MODIFIER_KEYPAD(VK_INSERT, CSI "2~", '0');
MATCH_MODIFIER_KEYPAD(VK_DELETE, CSI "3~",
_get_decimal_char());
case 0x30: // 0
case 0x31: // 1
case 0x39: // 9
case VK_OEM_1: // ;:
case VK_OEM_PLUS: // =+
case VK_OEM_COMMA: // ,<
case VK_OEM_PERIOD: // .>
case VK_OEM_7: // '"
case VK_OEM_102: // depends on keyboard, could be <> or \|
case VK_OEM_2: // /?
case VK_OEM_3: // `~
case VK_OEM_4: // [{
case VK_OEM_5: // \|
case VK_OEM_6: // ]}
{
seqbuflen = _get_control_character(seqbuf, key_event,
control_key_state);
if (_is_alt_pressed(control_key_state)) {
seqbuflen = _escape_prefix(seqbuf, seqbuflen);
}
}
break;
case 0x32: // 2
case 0x33: // 3
case 0x34: // 4
case 0x35: // 5
case 0x36: // 6
case 0x37: // 7
case 0x38: // 8
case VK_OEM_MINUS: // -_
{
seqbuflen = _get_control_character(seqbuf, key_event,
control_key_state);
// If Alt is pressed and it isn't Ctrl-Alt-ShiftUp, then
// prefix with escape.
if (_is_alt_pressed(control_key_state) &&
!(_is_ctrl_pressed(control_key_state) &&
!_is_shift_pressed(control_key_state))) {
seqbuflen = _escape_prefix(seqbuf, seqbuflen);
}
}
break;
case 0x41: // a
case 0x42: // b
case 0x43: // c
case 0x44: // d
case 0x45: // e
case 0x46: // f
case 0x47: // g
case 0x48: // h
case 0x49: // i
case 0x4a: // j
case 0x4b: // k
case 0x4c: // l
case 0x4d: // m
case 0x4e: // n
case 0x4f: // o
case 0x50: // p
case 0x51: // q
case 0x52: // r
case 0x53: // s
case 0x54: // t
case 0x55: // u
case 0x56: // v
case 0x57: // w
case 0x58: // x
case 0x59: // y
case 0x5a: // z
{
seqbuflen = _get_non_alt_char(seqbuf, key_event,
control_key_state);
// If Alt is pressed, then prefix with escape.
if (_is_alt_pressed(control_key_state)) {
seqbuflen = _escape_prefix(seqbuf, seqbuflen);
}
}
break;
// These virtual key codes are generated by the keys on the
// keypad *when NumLock is on* and *Shift is up*.
MATCH(VK_NUMPAD0, "0");
MATCH(VK_NUMPAD1, "1");
MATCH(VK_NUMPAD2, "2");
MATCH(VK_NUMPAD3, "3");
MATCH(VK_NUMPAD4, "4");
MATCH(VK_NUMPAD5, "5");
MATCH(VK_NUMPAD6, "6");
MATCH(VK_NUMPAD7, "7");
MATCH(VK_NUMPAD8, "8");
MATCH(VK_NUMPAD9, "9");
MATCH(VK_MULTIPLY, "*");
MATCH(VK_ADD, "+");
MATCH(VK_SUBTRACT, "-");
// VK_DECIMAL is generated by the . key on the keypad *when
// NumLock is on* and *Shift is up* and the sequence is not
// Ctrl-Alt-NoShift-. (which causes Ctrl-Alt-Del and the
// Windows Security screen to come up).
case VK_DECIMAL:
// U.S. English uses '.', Germany German uses ','.
seqbuflen = _get_non_control_char(seqbuf, key_event,
control_key_state);
break;
MATCH_MODIFIER(VK_F1, SS3 "P");
MATCH_MODIFIER(VK_F2, SS3 "Q");
MATCH_MODIFIER(VK_F3, SS3 "R");
MATCH_MODIFIER(VK_F4, SS3 "S");
MATCH_MODIFIER(VK_F5, CSI "15~");
MATCH_MODIFIER(VK_F6, CSI "17~");
MATCH_MODIFIER(VK_F7, CSI "18~");
MATCH_MODIFIER(VK_F8, CSI "19~");
MATCH_MODIFIER(VK_F9, CSI "20~");
MATCH_MODIFIER(VK_F10, CSI "21~");
MATCH_MODIFIER(VK_F11, CSI "23~");
MATCH_MODIFIER(VK_F12, CSI "24~");
MATCH_MODIFIER(VK_F13, CSI "25~");
MATCH_MODIFIER(VK_F14, CSI "26~");
MATCH_MODIFIER(VK_F15, CSI "28~");
MATCH_MODIFIER(VK_F16, CSI "29~");
MATCH_MODIFIER(VK_F17, CSI "31~");
MATCH_MODIFIER(VK_F18, CSI "32~");
MATCH_MODIFIER(VK_F19, CSI "33~");
MATCH_MODIFIER(VK_F20, CSI "34~");
// MATCH_MODIFIER(VK_F21, ???);
// MATCH_MODIFIER(VK_F22, ???);
// MATCH_MODIFIER(VK_F23, ???);
// MATCH_MODIFIER(VK_F24, ???);
}
}
#undef MATCH
#undef MATCH_MODIFIER
#undef MATCH_KEYPAD
#undef MATCH_MODIFIER_KEYPAD
#undef ESC
#undef CSI
#undef SS3
const char* out;
size_t outlen;
// Check for output in any of:
// * seqstr is set (and strlen can be used to determine the length).
// * seqbuf and seqbuflen are set
// Fallback to ch from Windows.
if (seqstr != NULL) {
out = seqstr;
outlen = strlen(seqstr);
} else if (seqbuflen > 0) {
out = seqbuf;
outlen = seqbuflen;
} else if (ch != '\0') {
// Use whatever Windows told us it is.
seqbuf[0] = ch;
seqbuflen = 1;
out = seqbuf;
outlen = seqbuflen;
} else {
// No special handling for the virtual key code and Windows isn't
// telling us a character code, then we don't know how to translate
// the key press.
//
// Consume the input and 'continue' to cause us to get a new key
// event.
D("_console_read: unknown virtual key code: %d, enhanced: %s",
vk, _is_enhanced_key(control_key_state) ? "true" : "false");
continue;
}
// put output wRepeatCount times into g_console_input_buffer
while (key_event->wRepeatCount-- > 0) {
g_console_input_buffer.insert(g_console_input_buffer.end(), out, out + outlen);
}
// Loop around and try to flush g_console_input_buffer
}
}
static DWORD _old_console_mode; // previous GetConsoleMode() result
static HANDLE _console_handle; // when set, console mode should be restored
void stdin_raw_init() {
const HANDLE in = _get_console_handle(STDIN_FILENO, &_old_console_mode);
if (in == nullptr) {
return;
}
// Disable ENABLE_PROCESSED_INPUT so that Ctrl-C is read instead of
// calling the process Ctrl-C routine (configured by
// SetConsoleCtrlHandler()).
// Disable ENABLE_LINE_INPUT so that input is immediately sent.
// Disable ENABLE_ECHO_INPUT to disable local echo. Disabling this
// flag also seems necessary to have proper line-ending processing.
DWORD new_console_mode = _old_console_mode & ~(ENABLE_PROCESSED_INPUT |
ENABLE_LINE_INPUT |
ENABLE_ECHO_INPUT);
// Enable ENABLE_WINDOW_INPUT to get window resizes.
new_console_mode |= ENABLE_WINDOW_INPUT;
if (!SetConsoleMode(in, new_console_mode)) {
// This really should not fail.
D("stdin_raw_init: SetConsoleMode() failed: %s",
android::base::SystemErrorCodeToString(GetLastError()).c_str());
}
// Once this is set, it means that stdin has been configured for
// reading from and that the old console mode should be restored later.
_console_handle = in;
// Note that we don't need to configure C Runtime line-ending
// translation because _console_read() does not call the C Runtime to
// read from the console.
}
void stdin_raw_restore() {
if (_console_handle != NULL) {
const HANDLE in = _console_handle;
_console_handle = NULL; // clear state
if (!SetConsoleMode(in, _old_console_mode)) {
// This really should not fail.
D("stdin_raw_restore: SetConsoleMode() failed: %s",
android::base::SystemErrorCodeToString(GetLastError()).c_str());
}
}
}
// Called by 'adb shell' and 'adb exec-in' (via unix_read()) to read from stdin.
int unix_read_interruptible(int fd, void* buf, size_t len) {
if ((fd == STDIN_FILENO) && (_console_handle != NULL)) {
// If it is a request to read from stdin, and stdin_raw_init() has been
// called, and it successfully configured the console, then read from
// the console using Win32 console APIs and partially emulate a unix
// terminal.
return _console_read(_console_handle, buf, len);
} else {
// On older versions of Windows (definitely 7, definitely not 10),
// ReadConsole() with a size >= 31367 fails, so if |fd| is a console
// we need to limit the read size.
if (len > 4096 && unix_isatty(fd)) {
len = 4096;
}
// Just call into C Runtime which can read from pipes/files and which
// can do LF/CR translation (which is overridable with _setmode()).
// Undefine the macro that is set in sysdeps.h which bans calls to
// plain read() in favor of unix_read() or adb_read().
#pragma push_macro("read")
#undef read
return read(fd, buf, len);
#pragma pop_macro("read")
}
}
/**************************************************************************/
/**************************************************************************/
/***** *****/
/***** Unicode support *****/
/***** *****/
/**************************************************************************/
/**************************************************************************/
// This implements support for using files with Unicode filenames and for
// outputting Unicode text to a Win32 console window. This is inspired from
// http://utf8everywhere.org/.
//
// Background
// ----------
//
// On POSIX systems, to deal with files with Unicode filenames, just pass UTF-8
// filenames to APIs such as open(). This works because filenames are largely
// opaque 'cookies' (perhaps excluding path separators).
//
// On Windows, the native file APIs such as CreateFileW() take 2-byte wchar_t
// UTF-16 strings. There is an API, CreateFileA() that takes 1-byte char
// strings, but the strings are in the ANSI codepage and not UTF-8. (The
// CreateFile() API is really just a macro that adds the W/A based on whether
// the UNICODE preprocessor symbol is defined).
//
// Options
// -------
//
// Thus, to write a portable program, there are a few options:
//
// 1. Write the program with wchar_t filenames (wchar_t path[256];).
// For Windows, just call CreateFileW(). For POSIX, write a wrapper openW()
// that takes a wchar_t string, converts it to UTF-8 and then calls the real
// open() API.
//
// 2. Write the program with a TCHAR typedef that is 2 bytes on Windows and
// 1 byte on POSIX. Make T-* wrappers for various OS APIs and call those,
// potentially touching a lot of code.
//
// 3. Write the program with a 1-byte char filenames (char path[256];) that are
// UTF-8. For POSIX, just call open(). For Windows, write a wrapper that
// takes a UTF-8 string, converts it to UTF-16 and then calls the real OS
// or C Runtime API.
//
// The Choice
// ----------
//
// The code below chooses option 3, the UTF-8 everywhere strategy. It uses
// android::base::WideToUTF8() which converts UTF-16 to UTF-8. This is used by the
// NarrowArgs helper class that is used to convert wmain() args into UTF-8
// args that are passed to main() at the beginning of program startup. We also use
// android::base::UTF8ToWide() which converts from UTF-8 to UTF-16. This is used to
// implement wrappers below that call UTF-16 OS and C Runtime APIs.
//
// Unicode console output
// ----------------------
//
// The way to output Unicode to a Win32 console window is to call
// WriteConsoleW() with UTF-16 text. (The user must also choose a proper font
// such as Lucida Console or Consolas, and in the case of East Asian languages
// (such as Chinese, Japanese, Korean), the user must go to the Control Panel
// and change the "system locale" to Chinese, etc., which allows a Chinese, etc.
// font to be used in console windows.)
//
// The problem is getting the C Runtime to make fprintf and related APIs call
// WriteConsoleW() under the covers. The C Runtime API, _setmode() sounds
// promising, but the various modes have issues:
//
// 1. _setmode(_O_TEXT) (the default) does not use WriteConsoleW() so UTF-8 and
// UTF-16 do not display properly.
// 2. _setmode(_O_BINARY) does not use WriteConsoleW() and the text comes out
// totally wrong.
// 3. _setmode(_O_U8TEXT) seems to cause the C Runtime _invalid_parameter
// handler to be called (upon a later I/O call), aborting the process.
// 4. _setmode(_O_U16TEXT) and _setmode(_O_WTEXT) cause non-wide printf/fprintf
// to output nothing.
//
// So the only solution is to write our own adb_fprintf() that converts UTF-8
// to UTF-16 and then calls WriteConsoleW().
// Constructor for helper class to convert wmain() UTF-16 args to UTF-8 to
// be passed to main().
NarrowArgs::NarrowArgs(const int argc, wchar_t** const argv) {
narrow_args = new char*[argc + 1];
for (int i = 0; i < argc; ++i) {
std::string arg_narrow;
if (!android::base::WideToUTF8(argv[i], &arg_narrow)) {
fatal_errno("cannot convert argument from UTF-16 to UTF-8");
}
narrow_args[i] = strdup(arg_narrow.c_str());
}
narrow_args[argc] = nullptr; // terminate
}
NarrowArgs::~NarrowArgs() {
if (narrow_args != nullptr) {
for (char** argp = narrow_args; *argp != nullptr; ++argp) {
free(*argp);
}
delete[] narrow_args;
narrow_args = nullptr;
}
}
int unix_open(const char* path, int options, ...) {
std::wstring path_wide;
if (!android::base::UTF8ToWide(path, &path_wide)) {
return -1;
}
if ((options & O_CREAT) == 0) {
return _wopen(path_wide.c_str(), options);
} else {
int mode;
va_list args;
va_start(args, options);
mode = va_arg(args, int);
va_end(args);
return _wopen(path_wide.c_str(), options, mode);
}
}
// Version of stat() that takes a UTF-8 path.
int adb_stat(const char* path, struct adb_stat* s) {
#pragma push_macro("wstat")
// This definition of wstat seems to be missing from <sys/stat.h>.
#if defined(_FILE_OFFSET_BITS) && (_FILE_OFFSET_BITS == 64)
#ifdef _USE_32BIT_TIME_T
#define wstat _wstat32i64
#else
#define wstat _wstat64
#endif
#else
// <sys/stat.h> has a function prototype for wstat() that should be available.
#endif
std::wstring path_wide;
if (!android::base::UTF8ToWide(path, &path_wide)) {
return -1;
}
return wstat(path_wide.c_str(), s);
#pragma pop_macro("wstat")
}
// Version of opendir() that takes a UTF-8 path.
DIR* adb_opendir(const char* path) {
std::wstring path_wide;
if (!android::base::UTF8ToWide(path, &path_wide)) {
return nullptr;
}
// Just cast _WDIR* to DIR*. This doesn't work if the caller reads any of
// the fields, but right now all the callers treat the structure as
// opaque.
return reinterpret_cast<DIR*>(_wopendir(path_wide.c_str()));
}
// Version of readdir() that returns UTF-8 paths.
struct dirent* adb_readdir(DIR* dir) {
_WDIR* const wdir = reinterpret_cast<_WDIR*>(dir);
struct _wdirent* const went = _wreaddir(wdir);
if (went == nullptr) {
return nullptr;
}
// Convert from UTF-16 to UTF-8.
std::string name_utf8;
if (!android::base::WideToUTF8(went->d_name, &name_utf8)) {
return nullptr;
}
// Cast the _wdirent* to dirent* and overwrite the d_name field (which has
// space for UTF-16 wchar_t's) with UTF-8 char's.
struct dirent* ent = reinterpret_cast<struct dirent*>(went);
if (name_utf8.length() + 1 > sizeof(went->d_name)) {
// Name too big to fit in existing buffer.
errno = ENOMEM;
return nullptr;
}
// Note that sizeof(_wdirent::d_name) is bigger than sizeof(dirent::d_name)
// because _wdirent contains wchar_t instead of char. So even if name_utf8
// can fit in _wdirent::d_name, the resulting dirent::d_name field may be
// bigger than the caller expects because they expect a dirent structure
// which has a smaller d_name field. Ignore this since the caller should be
// resilient.
// Rewrite the UTF-16 d_name field to UTF-8.
strcpy(ent->d_name, name_utf8.c_str());
return ent;
}
// Version of closedir() to go with our version of adb_opendir().
int adb_closedir(DIR* dir) {
return _wclosedir(reinterpret_cast<_WDIR*>(dir));
}
// Version of unlink() that takes a UTF-8 path.
int adb_unlink(const char* path) {
std::wstring wpath;
if (!android::base::UTF8ToWide(path, &wpath)) {
return -1;
}
int rc = _wunlink(wpath.c_str());
if (rc == -1 && errno == EACCES) {
/* unlink returns EACCES when the file is read-only, so we first */
/* try to make it writable, then unlink again... */
rc = _wchmod(wpath.c_str(), _S_IREAD | _S_IWRITE);
if (rc == 0)
rc = _wunlink(wpath.c_str());
}
return rc;
}
// Version of mkdir() that takes a UTF-8 path.
int adb_mkdir(const std::string& path, int mode) {
std::wstring path_wide;
if (!android::base::UTF8ToWide(path, &path_wide)) {
return -1;
}
return _wmkdir(path_wide.c_str());
}
// Version of utime() that takes a UTF-8 path.
int adb_utime(const char* path, struct utimbuf* u) {
std::wstring path_wide;
if (!android::base::UTF8ToWide(path, &path_wide)) {
return -1;
}
static_assert(sizeof(struct utimbuf) == sizeof(struct _utimbuf),
"utimbuf and _utimbuf should be the same size because they both "
"contain the same types, namely time_t");
return _wutime(path_wide.c_str(), reinterpret_cast<struct _utimbuf*>(u));
}
// Version of chmod() that takes a UTF-8 path.
int adb_chmod(const char* path, int mode) {
std::wstring path_wide;
if (!android::base::UTF8ToWide(path, &path_wide)) {
return -1;
}
return _wchmod(path_wide.c_str(), mode);
}
// From libutils/Unicode.cpp, get the length of a UTF-8 sequence given the lead byte.
static inline size_t utf8_codepoint_len(uint8_t ch) {
return ((0xe5000000 >> ((ch >> 3) & 0x1e)) & 3) + 1;
}
namespace internal {
// Given a sequence of UTF-8 bytes (denoted by the range [first, last)), return the number of bytes
// (from the beginning) that are complete UTF-8 sequences and append the remaining bytes to
// remaining_bytes.
size_t ParseCompleteUTF8(const char* const first, const char* const last,
std::vector<char>* const remaining_bytes) {
// Walk backwards from the end of the sequence looking for the beginning of a UTF-8 sequence.
// Current_after points one byte past the current byte to be examined.
for (const char* current_after = last; current_after != first; --current_after) {
const char* const current = current_after - 1;
const char ch = *current;
const char kHighBit = 0x80u;
const char kTwoHighestBits = 0xC0u;
if ((ch & kHighBit) == 0) { // high bit not set
// The buffer ends with a one-byte UTF-8 sequence, possibly followed by invalid trailing
// bytes with no leading byte, so return the entire buffer.
break;
} else if ((ch & kTwoHighestBits) == kTwoHighestBits) { // top two highest bits set
// Lead byte in UTF-8 sequence, so check if we have all the bytes in the sequence.
const size_t bytes_available = last - current;
if (bytes_available < utf8_codepoint_len(ch)) {
// We don't have all the bytes in the UTF-8 sequence, so return all the bytes
// preceding the current incomplete UTF-8 sequence and append the remaining bytes
// to remaining_bytes.
remaining_bytes->insert(remaining_bytes->end(), current, last);
return current - first;
} else {
// The buffer ends with a complete UTF-8 sequence, possibly followed by invalid
// trailing bytes with no lead byte, so return the entire buffer.
break;
}
} else {
// Trailing byte, so keep going backwards looking for the lead byte.
}
}
// Return the size of the entire buffer. It is possible that we walked backward past invalid
// trailing bytes with no lead byte, in which case we want to return all those invalid bytes
// so that they can be processed.
return last - first;
}
}
// Bytes that have not yet been output to the console because they are incomplete UTF-8 sequences.
// Note that we use only one buffer even though stderr and stdout are logically separate streams.
// This matches the behavior of Linux.
// Protected by g_console_output_buffer_lock.
static auto& g_console_output_buffer = *new std::vector<char>();
// Internal helper function to write UTF-8 bytes to a console. Returns -1 on error.
static int _console_write_utf8(const char* const buf, const size_t buf_size, FILE* stream,
HANDLE console) {
const int saved_errno = errno;
std::vector<char> combined_buffer;
// Complete UTF-8 sequences that should be immediately written to the console.
const char* utf8;
size_t utf8_size;
adb_mutex_lock(&g_console_output_buffer_lock);
if (g_console_output_buffer.empty()) {
// If g_console_output_buffer doesn't have a buffered up incomplete UTF-8 sequence (the
// common case with plain ASCII), parse buf directly.
utf8 = buf;
utf8_size = internal::ParseCompleteUTF8(buf, buf + buf_size, &g_console_output_buffer);
} else {
// If g_console_output_buffer has a buffered up incomplete UTF-8 sequence, move it to
// combined_buffer (and effectively clear g_console_output_buffer) and append buf to
// combined_buffer, then parse it all together.
combined_buffer.swap(g_console_output_buffer);
combined_buffer.insert(combined_buffer.end(), buf, buf + buf_size);
utf8 = combined_buffer.data();
utf8_size = internal::ParseCompleteUTF8(utf8, utf8 + combined_buffer.size(),
&g_console_output_buffer);
}
adb_mutex_unlock(&g_console_output_buffer_lock);
std::wstring utf16;
// Try to convert from data that might be UTF-8 to UTF-16, ignoring errors (just like Linux
// which does not return an error on bad UTF-8). Data might not be UTF-8 if the user cat's
// random data, runs dmesg (which might have non-UTF-8), etc.
// This could throw std::bad_alloc.
(void)android::base::UTF8ToWide(utf8, utf8_size, &utf16);
// Note that this does not do \n => \r\n translation because that
// doesn't seem necessary for the Windows console. For the Windows
// console \r moves to the beginning of the line and \n moves to a new
// line.
// Flush any stream buffering so that our output is afterwards which
// makes sense because our call is afterwards.
(void)fflush(stream);
// Write UTF-16 to the console.
DWORD written = 0;
if (!WriteConsoleW(console, utf16.c_str(), utf16.length(), &written, NULL)) {
errno = EIO;
return -1;
}
// Return the size of the original buffer passed in, signifying that we consumed it all, even
// if nothing was displayed, in the case of being passed an incomplete UTF-8 sequence. This
// matches the Linux behavior.
errno = saved_errno;
return buf_size;
}
// Function prototype because attributes cannot be placed on func definitions.
static int _console_vfprintf(const HANDLE console, FILE* stream,
const char *format, va_list ap)
__attribute__((__format__(ADB_FORMAT_ARCHETYPE, 3, 0)));
// Internal function to format a UTF-8 string and write it to a Win32 console.
// Returns -1 on error.
static int _console_vfprintf(const HANDLE console, FILE* stream,
const char *format, va_list ap) {
const int saved_errno = errno;
std::string output_utf8;
// Format the string.
// This could throw std::bad_alloc.
android::base::StringAppendV(&output_utf8, format, ap);
const int result = _console_write_utf8(output_utf8.c_str(), output_utf8.length(), stream,
console);
if (result != -1) {
errno = saved_errno;
} else {
// If -1 was returned, errno has been set.
}
return result;
}
// Version of vfprintf() that takes UTF-8 and can write Unicode to a
// Windows console.
int adb_vfprintf(FILE *stream, const char *format, va_list ap) {
const HANDLE console = _get_console_handle(stream);
// If there is an associated Win32 console, write to it specially,
// otherwise defer to the regular C Runtime, passing it UTF-8.
if (console != NULL) {
return _console_vfprintf(console, stream, format, ap);
} else {
// If vfprintf is a macro, undefine it, so we can call the real
// C Runtime API.
#pragma push_macro("vfprintf")
#undef vfprintf
return vfprintf(stream, format, ap);
#pragma pop_macro("vfprintf")
}
}
// Version of vprintf() that takes UTF-8 and can write Unicode to a Windows console.
int adb_vprintf(const char *format, va_list ap) {
return adb_vfprintf(stdout, format, ap);
}
// Version of fprintf() that takes UTF-8 and can write Unicode to a
// Windows console.
int adb_fprintf(FILE *stream, const char *format, ...) {
va_list ap;
va_start(ap, format);
const int result = adb_vfprintf(stream, format, ap);
va_end(ap);
return result;
}
// Version of printf() that takes UTF-8 and can write Unicode to a
// Windows console.
int adb_printf(const char *format, ...) {
va_list ap;
va_start(ap, format);
const int result = adb_vfprintf(stdout, format, ap);
va_end(ap);
return result;
}
// Version of fputs() that takes UTF-8 and can write Unicode to a
// Windows console.
int adb_fputs(const char* buf, FILE* stream) {
// adb_fprintf returns -1 on error, which is conveniently the same as EOF
// which fputs (and hence adb_fputs) should return on error.
static_assert(EOF == -1, "EOF is not -1, so this code needs to be fixed");
return adb_fprintf(stream, "%s", buf);
}
// Version of fputc() that takes UTF-8 and can write Unicode to a
// Windows console.
int adb_fputc(int ch, FILE* stream) {
const int result = adb_fprintf(stream, "%c", ch);
if (result == -1) {
return EOF;
}
// For success, fputc returns the char, cast to unsigned char, then to int.
return static_cast<unsigned char>(ch);
}
// Version of putchar() that takes UTF-8 and can write Unicode to a Windows console.
int adb_putchar(int ch) {
return adb_fputc(ch, stdout);
}
// Version of puts() that takes UTF-8 and can write Unicode to a Windows console.
int adb_puts(const char* buf) {
// adb_printf returns -1 on error, which is conveniently the same as EOF
// which puts (and hence adb_puts) should return on error.
static_assert(EOF == -1, "EOF is not -1, so this code needs to be fixed");
return adb_printf("%s\n", buf);
}
// Internal function to write UTF-8 to a Win32 console. Returns the number of
// items (of length size) written. On error, returns a short item count or 0.
static size_t _console_fwrite(const void* ptr, size_t size, size_t nmemb,
FILE* stream, HANDLE console) {
const int result = _console_write_utf8(reinterpret_cast<const char*>(ptr), size * nmemb, stream,
console);
if (result == -1) {
return 0;
}
return result / size;
}
// Version of fwrite() that takes UTF-8 and can write Unicode to a
// Windows console.
size_t adb_fwrite(const void* ptr, size_t size, size_t nmemb, FILE* stream) {
const HANDLE console = _get_console_handle(stream);
// If there is an associated Win32 console, write to it specially,
// otherwise defer to the regular C Runtime, passing it UTF-8.
if (console != NULL) {
return _console_fwrite(ptr, size, nmemb, stream, console);
} else {
// If fwrite is a macro, undefine it, so we can call the real
// C Runtime API.
#pragma push_macro("fwrite")
#undef fwrite
return fwrite(ptr, size, nmemb, stream);
#pragma pop_macro("fwrite")
}
}
// Version of fopen() that takes a UTF-8 filename and can access a file with
// a Unicode filename.
FILE* adb_fopen(const char* path, const char* mode) {
std::wstring path_wide;
if (!android::base::UTF8ToWide(path, &path_wide)) {
return nullptr;
}
std::wstring mode_wide;
if (!android::base::UTF8ToWide(mode, &mode_wide)) {
return nullptr;
}
return _wfopen(path_wide.c_str(), mode_wide.c_str());
}
// Return a lowercase version of the argument. Uses C Runtime tolower() on
// each byte which is not UTF-8 aware, and theoretically uses the current C
// Runtime locale (which in practice is not changed, so this becomes a ASCII
// conversion).
static std::string ToLower(const std::string& anycase) {
// copy string
std::string str(anycase);
// transform the copy
std::transform(str.begin(), str.end(), str.begin(), tolower);
return str;
}
extern "C" int main(int argc, char** argv);
// Link with -municode to cause this wmain() to be used as the program
// entrypoint. It will convert the args from UTF-16 to UTF-8 and call the
// regular main() with UTF-8 args.
extern "C" int wmain(int argc, wchar_t **argv) {
// Convert args from UTF-16 to UTF-8 and pass that to main().
NarrowArgs narrow_args(argc, argv);
return main(argc, narrow_args.data());
}
// Shadow UTF-8 environment variable name/value pairs that are created from
// _wenviron the first time that adb_getenv() is called. Note that this is not
// currently updated if putenv, setenv, unsetenv are called. Note that no
// thread synchronization is done, but we're called early enough in
// single-threaded startup that things work ok.
static auto& g_environ_utf8 = *new std::unordered_map<std::string, char*>();
// Make sure that shadow UTF-8 environment variables are setup.
static void _ensure_env_setup() {
// If some name/value pairs exist, then we've already done the setup below.
if (g_environ_utf8.size() != 0) {
return;
}
if (_wenviron == nullptr) {
// If _wenviron is null, then -municode probably wasn't used. That
// linker flag will cause the entry point to setup _wenviron. It will
// also require an implementation of wmain() (which we provide above).
fatal("_wenviron is not set, did you link with -municode?");
}
// Read name/value pairs from UTF-16 _wenviron and write new name/value
// pairs to UTF-8 g_environ_utf8. Note that it probably does not make sense
// to use the D() macro here because that tracing only works if the
// ADB_TRACE environment variable is setup, but that env var can't be read
// until this code completes.
for (wchar_t** env = _wenviron; *env != nullptr; ++env) {
wchar_t* const equal = wcschr(*env, L'=');
if (equal == nullptr) {
// Malformed environment variable with no equal sign. Shouldn't
// really happen, but we should be resilient to this.
continue;
}
// If we encounter an error converting UTF-16, don't error-out on account of a single env
// var because the program might never even read this particular variable.
std::string name_utf8;
if (!android::base::WideToUTF8(*env, equal - *env, &name_utf8)) {
continue;
}
// Store lowercase name so that we can do case-insensitive searches.
name_utf8 = ToLower(name_utf8);
std::string value_utf8;
if (!android::base::WideToUTF8(equal + 1, &value_utf8)) {
continue;
}
char* const value_dup = strdup(value_utf8.c_str());
// Don't overwrite a previus env var with the same name. In reality,
// the system probably won't let two env vars with the same name exist
// in _wenviron.
g_environ_utf8.insert({name_utf8, value_dup});
}
}
// Version of getenv() that takes a UTF-8 environment variable name and
// retrieves a UTF-8 value. Case-insensitive to match getenv() on Windows.
char* adb_getenv(const char* name) {
_ensure_env_setup();
// Case-insensitive search by searching for lowercase name in a map of
// lowercase names.
const auto it = g_environ_utf8.find(ToLower(std::string(name)));
if (it == g_environ_utf8.end()) {
return nullptr;
}
return it->second;
}
// Version of getcwd() that returns the current working directory in UTF-8.
char* adb_getcwd(char* buf, int size) {
wchar_t* wbuf = _wgetcwd(nullptr, 0);
if (wbuf == nullptr) {
return nullptr;
}
std::string buf_utf8;
const bool narrow_result = android::base::WideToUTF8(wbuf, &buf_utf8);
free(wbuf);
wbuf = nullptr;
if (!narrow_result) {
return nullptr;
}
// If size was specified, make sure all the chars will fit.
if (size != 0) {
if (size < static_cast<int>(buf_utf8.length() + 1)) {
errno = ERANGE;
return nullptr;
}
}
// If buf was not specified, allocate storage.
if (buf == nullptr) {
if (size == 0) {
size = buf_utf8.length() + 1;
}
buf = reinterpret_cast<char*>(malloc(size));
if (buf == nullptr) {
return nullptr;
}
}
// Destination buffer was allocated with enough space, or we've already
// checked an existing buffer size for enough space.
strcpy(buf, buf_utf8.c_str());
return buf;
}
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