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platform_system_core/logcat/logcat.cpp
Mark Salyzyn c74f8d91a5 logcat: -v thread help missing 
KISS documentation for -v thread added

Test: manual logcat -v --help
Bug: 37030280
Change-Id: If1ad9d3862a68dfe570b524c36efd4fae5b03262
2017-05-15 13:41:16 -07:00

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/*
* Copyright (C) 2006-2017 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.
*/
#include <arpa/inet.h>
#include <assert.h>
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <math.h>
#include <pthread.h>
#include <sched.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/cdefs.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#include <atomic>
#include <memory>
#include <string>
#include <vector>
#include <android-base/file.h>
#include <android-base/properties.h>
#include <android-base/stringprintf.h>
#include <android-base/strings.h>
#include <cutils/sched_policy.h>
#include <cutils/sockets.h>
#include <log/event_tag_map.h>
#include <log/getopt.h>
#include <log/logcat.h>
#include <log/logprint.h>
#include <private/android_logger.h>
#include <system/thread_defs.h>
#include <pcrecpp.h>
#define DEFAULT_MAX_ROTATED_LOGS 4
struct log_device_t {
const char* device;
bool binary;
struct logger* logger;
struct logger_list* logger_list;
bool printed;
log_device_t* next;
log_device_t(const char* d, bool b) {
device = d;
binary = b;
next = nullptr;
printed = false;
logger = nullptr;
logger_list = nullptr;
}
};
struct android_logcat_context_internal {
// status
volatile std::atomic_int retval; // valid if thread_stopped set
// Arguments passed in, or copies and storage thereof if a thread.
int argc;
char* const* argv;
char* const* envp;
std::vector<std::string> args;
std::vector<const char*> argv_hold;
std::vector<std::string> envs;
std::vector<const char*> envp_hold;
int output_fd; // duplication of fileno(output) (below)
int error_fd; // duplication of fileno(error) (below)
// library
int fds[2]; // From popen call
FILE* output; // everything writes to fileno(output), buffer unused
FILE* error; // unless error == output.
pthread_t thr;
volatile std::atomic_bool stop; // quick exit flag
volatile std::atomic_bool thread_stopped;
bool stderr_null; // shell "2>/dev/null"
bool stderr_stdout; // shell "2>&1"
// global variables
AndroidLogFormat* logformat;
const char* outputFileName;
// 0 means "no log rotation"
size_t logRotateSizeKBytes;
// 0 means "unbounded"
size_t maxRotatedLogs;
size_t outByteCount;
int printBinary;
int devCount; // >1 means multiple
pcrecpp::RE* regex;
log_device_t* devices;
EventTagMap* eventTagMap;
// 0 means "infinite"
size_t maxCount;
size_t printCount;
bool printItAnyways;
bool debug;
bool hasOpenedEventTagMap;
};
// Creates a context associated with this logcat instance
android_logcat_context create_android_logcat() {
android_logcat_context_internal* context;
context = (android_logcat_context_internal*)calloc(
1, sizeof(android_logcat_context_internal));
if (!context) return nullptr;
context->fds[0] = -1;
context->fds[1] = -1;
context->output_fd = -1;
context->error_fd = -1;
context->maxRotatedLogs = DEFAULT_MAX_ROTATED_LOGS;
context->argv_hold.clear();
context->args.clear();
context->envp_hold.clear();
context->envs.clear();
return (android_logcat_context)context;
}
// logd prefixes records with a length field
#define RECORD_LENGTH_FIELD_SIZE_BYTES sizeof(uint32_t)
namespace android {
enum helpType { HELP_FALSE, HELP_TRUE, HELP_FORMAT };
// if showHelp is set, newline required in fmt statement to transition to usage
static void logcat_panic(android_logcat_context_internal* context,
enum helpType showHelp, const char* fmt, ...)
__printflike(3, 4);
static int openLogFile(const char* pathname) {
return open(pathname, O_WRONLY | O_APPEND | O_CREAT, S_IRUSR | S_IWUSR);
}
static void close_output(android_logcat_context_internal* context) {
// split output_from_error
if (context->error == context->output) {
context->output = nullptr;
context->output_fd = -1;
}
if (context->error && (context->output_fd == fileno(context->error))) {
context->output_fd = -1;
}
if (context->output_fd == context->error_fd) {
context->output_fd = -1;
}
// close output channel
if (context->output) {
if (context->output != stdout) {
if (context->output_fd == fileno(context->output)) {
context->output_fd = -1;
}
if (context->fds[1] == fileno(context->output)) {
context->fds[1] = -1;
}
fclose(context->output);
}
context->output = nullptr;
}
if (context->output_fd >= 0) {
if (context->output_fd != fileno(stdout)) {
if (context->fds[1] == context->output_fd) {
context->fds[1] = -1;
}
close(context->output_fd);
}
context->output_fd = -1;
}
}
static void close_error(android_logcat_context_internal* context) {
// split error_from_output
if (context->output == context->error) {
context->error = nullptr;
context->error_fd = -1;
}
if (context->output && (context->error_fd == fileno(context->output))) {
context->error_fd = -1;
}
if (context->error_fd == context->output_fd) {
context->error_fd = -1;
}
// close error channel
if (context->error) {
if ((context->error != stderr) && (context->error != stdout)) {
if (context->error_fd == fileno(context->error)) {
context->error_fd = -1;
}
if (context->fds[1] == fileno(context->error)) {
context->fds[1] = -1;
}
fclose(context->error);
}
context->error = nullptr;
}
if (context->error_fd >= 0) {
if ((context->error_fd != fileno(stdout)) &&
(context->error_fd != fileno(stderr))) {
if (context->fds[1] == context->error_fd) context->fds[1] = -1;
close(context->error_fd);
}
context->error_fd = -1;
}
}
static void rotateLogs(android_logcat_context_internal* context) {
int err;
// Can't rotate logs if we're not outputting to a file
if (!context->outputFileName) return;
close_output(context);
// Compute the maximum number of digits needed to count up to
// maxRotatedLogs in decimal. eg:
// maxRotatedLogs == 30
// -> log10(30) == 1.477
// -> maxRotationCountDigits == 2
int maxRotationCountDigits =
(context->maxRotatedLogs > 0)
? (int)(floor(log10(context->maxRotatedLogs) + 1))
: 0;
for (int i = context->maxRotatedLogs; i > 0; i--) {
std::string file1 = android::base::StringPrintf(
"%s.%.*d", context->outputFileName, maxRotationCountDigits, i);
std::string file0;
if (!(i - 1)) {
file0 = android::base::StringPrintf("%s", context->outputFileName);
} else {
file0 =
android::base::StringPrintf("%s.%.*d", context->outputFileName,
maxRotationCountDigits, i - 1);
}
if (!file0.length() || !file1.length()) {
perror("while rotating log files");
break;
}
err = rename(file0.c_str(), file1.c_str());
if (err < 0 && errno != ENOENT) {
perror("while rotating log files");
}
}
context->output_fd = openLogFile(context->outputFileName);
if (context->output_fd < 0) {
logcat_panic(context, HELP_FALSE, "couldn't open output file");
return;
}
context->output = fdopen(context->output_fd, "web");
if (!context->output) {
logcat_panic(context, HELP_FALSE, "couldn't fdopen output file");
return;
}
if (context->stderr_stdout) {
close_error(context);
context->error = context->output;
context->error_fd = context->output_fd;
}
context->outByteCount = 0;
}
void printBinary(android_logcat_context_internal* context, struct log_msg* buf) {
size_t size = buf->len();
TEMP_FAILURE_RETRY(write(context->output_fd, buf, size));
}
static bool regexOk(android_logcat_context_internal* context,
const AndroidLogEntry& entry) {
if (!context->regex) return true;
std::string messageString(entry.message, entry.messageLen);
return context->regex->PartialMatch(messageString);
}
static void processBuffer(android_logcat_context_internal* context,
log_device_t* dev, struct log_msg* buf) {
int bytesWritten = 0;
int err;
AndroidLogEntry entry;
char binaryMsgBuf[1024];
if (dev->binary) {
if (!context->eventTagMap && !context->hasOpenedEventTagMap) {
context->eventTagMap = android_openEventTagMap(nullptr);
context->hasOpenedEventTagMap = true;
}
err = android_log_processBinaryLogBuffer(
&buf->entry_v1, &entry, context->eventTagMap, binaryMsgBuf,
sizeof(binaryMsgBuf));
// printf(">>> pri=%d len=%d msg='%s'\n",
// entry.priority, entry.messageLen, entry.message);
} else {
err = android_log_processLogBuffer(&buf->entry_v1, &entry);
}
if ((err < 0) && !context->debug) return;
if (android_log_shouldPrintLine(
context->logformat, std::string(entry.tag, entry.tagLen).c_str(),
entry.priority)) {
bool match = regexOk(context, entry);
context->printCount += match;
if (match || context->printItAnyways) {
bytesWritten = android_log_printLogLine(context->logformat,
context->output_fd, &entry);
if (bytesWritten < 0) {
logcat_panic(context, HELP_FALSE, "output error");
return;
}
}
}
context->outByteCount += bytesWritten;
if (context->logRotateSizeKBytes > 0 &&
(context->outByteCount / 1024) >= context->logRotateSizeKBytes) {
rotateLogs(context);
}
}
static void maybePrintStart(android_logcat_context_internal* context,
log_device_t* dev, bool printDividers) {
if (!dev->printed || printDividers) {
if (context->devCount > 1 && !context->printBinary) {
char buf[1024];
snprintf(buf, sizeof(buf), "--------- %s %s\n",
dev->printed ? "switch to" : "beginning of", dev->device);
if (write(context->output_fd, buf, strlen(buf)) < 0) {
logcat_panic(context, HELP_FALSE, "output error");
return;
}
}
dev->printed = true;
}
}
static void setupOutputAndSchedulingPolicy(
android_logcat_context_internal* context, bool blocking) {
if (!context->outputFileName) return;
if (blocking) {
// Lower priority and set to batch scheduling if we are saving
// the logs into files and taking continuous content.
if ((set_sched_policy(0, SP_BACKGROUND) < 0) && context->error) {
fprintf(context->error,
"failed to set background scheduling policy\n");
}
struct sched_param param;
memset(&param, 0, sizeof(param));
if (sched_setscheduler((pid_t)0, SCHED_BATCH, &param) < 0) {
fprintf(stderr, "failed to set to batch scheduler\n");
}
if ((setpriority(PRIO_PROCESS, 0, ANDROID_PRIORITY_BACKGROUND) < 0) &&
context->error) {
fprintf(context->error, "failed set to priority\n");
}
}
close_output(context);
context->output_fd = openLogFile(context->outputFileName);
if (context->output_fd < 0) {
logcat_panic(context, HELP_FALSE, "couldn't open output file");
return;
}
struct stat statbuf;
if (fstat(context->output_fd, &statbuf) == -1) {
close_output(context);
logcat_panic(context, HELP_FALSE, "couldn't get output file stat\n");
return;
}
if ((size_t)statbuf.st_size > SIZE_MAX || statbuf.st_size < 0) {
close_output(context);
logcat_panic(context, HELP_FALSE, "invalid output file stat\n");
return;
}
context->output = fdopen(context->output_fd, "web");
context->outByteCount = statbuf.st_size;
}
// clang-format off
static void show_help(android_logcat_context_internal* context) {
if (!context->error) return;
const char* cmd = strrchr(context->argv[0], '/');
cmd = cmd ? cmd + 1 : context->argv[0];
fprintf(context->error, "Usage: %s [options] [filterspecs]\n", cmd);
fprintf(context->error, "options include:\n"
" -s Set default filter to silent. Equivalent to filterspec '*:S'\n"
" -f <file>, --file=<file> Log to file. Default is stdout\n"
" -r <kbytes>, --rotate-kbytes=<kbytes>\n"
" Rotate log every kbytes. Requires -f option\n"
" -n <count>, --rotate-count=<count>\n"
" Sets max number of rotated logs to <count>, default 4\n"
" --id=<id> If the signature id for logging to file changes, then clear\n"
" the fileset and continue\n"
" -v <format>, --format=<format>\n"
" Sets log print format verb and adverbs, where <format> is:\n"
" brief help long process raw tag thread threadtime time\n"
" and individually flagged modifying adverbs can be added:\n"
" color descriptive epoch monotonic printable uid\n"
" usec UTC year zone\n"
" Multiple -v parameters or comma separated list of format and\n"
" format modifiers are allowed.\n"
// private and undocumented nsec, no signal, too much noise
// useful for -T or -t <timestamp> accurate testing though.
" -D, --dividers Print dividers between each log buffer\n"
" -c, --clear Clear (flush) the entire log and exit\n"
" if Log to File specified, clear fileset instead\n"
" -d Dump the log and then exit (don't block)\n"
" -e <expr>, --regex=<expr>\n"
" Only print lines where the log message matches <expr>\n"
" where <expr> is a regular expression\n"
// Leave --head undocumented as alias for -m
" -m <count>, --max-count=<count>\n"
" Quit after printing <count> lines. This is meant to be\n"
" paired with --regex, but will work on its own.\n"
" --print Paired with --regex and --max-count to let content bypass\n"
" regex filter but still stop at number of matches.\n"
// Leave --tail undocumented as alias for -t
" -t <count> Print only the most recent <count> lines (implies -d)\n"
" -t '<time>' Print most recent lines since specified time (implies -d)\n"
" -T <count> Print only the most recent <count> lines (does not imply -d)\n"
" -T '<time>' Print most recent lines since specified time (not imply -d)\n"
" count is pure numerical, time is 'MM-DD hh:mm:ss.mmm...'\n"
" 'YYYY-MM-DD hh:mm:ss.mmm...' or 'sssss.mmm...' format\n"
" -g, --buffer-size Get the size of the ring buffer.\n"
" -G <size>, --buffer-size=<size>\n"
" Set size of log ring buffer, may suffix with K or M.\n"
" -L, --last Dump logs from prior to last reboot\n"
// Leave security (Device Owner only installations) and
// kernel (userdebug and eng) buffers undocumented.
" -b <buffer>, --buffer=<buffer> Request alternate ring buffer, 'main',\n"
" 'system', 'radio', 'events', 'crash', 'default' or 'all'.\n"
" Multiple -b parameters or comma separated list of buffers are\n"
" allowed. Buffers interleaved. Default -b main,system,crash.\n"
" -B, --binary Output the log in binary.\n"
" -S, --statistics Output statistics.\n"
" -p, --prune Print prune white and ~black list. Service is specified as\n"
" UID, UID/PID or /PID. Weighed for quicker pruning if prefix\n"
" with ~, otherwise weighed for longevity if unadorned. All\n"
" other pruning activity is oldest first. Special case ~!\n"
" represents an automatic quicker pruning for the noisiest\n"
" UID as determined by the current statistics.\n"
" -P '<list> ...', --prune='<list> ...'\n"
" Set prune white and ~black list, using same format as\n"
" listed above. Must be quoted.\n"
" --pid=<pid> Only prints logs from the given pid.\n"
// Check ANDROID_LOG_WRAP_DEFAULT_TIMEOUT value for match to 2 hours
" --wrap Sleep for 2 hours or when buffer about to wrap whichever\n"
" comes first. Improves efficiency of polling by providing\n"
" an about-to-wrap wakeup.\n");
fprintf(context->error, "\nfilterspecs are a series of \n"
" <tag>[:priority]\n\n"
"where <tag> is a log component tag (or * for all) and priority is:\n"
" V Verbose (default for <tag>)\n"
" D Debug (default for '*')\n"
" I Info\n"
" W Warn\n"
" E Error\n"
" F Fatal\n"
" S Silent (suppress all output)\n"
"\n'*' by itself means '*:D' and <tag> by itself means <tag>:V.\n"
"If no '*' filterspec or -s on command line, all filter defaults to '*:V'.\n"
"eg: '*:S <tag>' prints only <tag>, '<tag>:S' suppresses all <tag> log messages.\n"
"\nIf not specified on the command line, filterspec is set from ANDROID_LOG_TAGS.\n"
"\nIf not specified with -v on command line, format is set from ANDROID_PRINTF_LOG\n"
"or defaults to \"threadtime\"\n\n");
}
static void show_format_help(android_logcat_context_internal* context) {
if (!context->error) return;
fprintf(context->error,
"-v <format>, --format=<format> options:\n"
" Sets log print format verb and adverbs, where <format> is:\n"
" brief long process raw tag thread threadtime time\n"
" and individually flagged modifying adverbs can be added:\n"
" color descriptive epoch monotonic printable uid usec UTC year zone\n"
"\nSingle format verbs:\n"
" brief — Display priority/tag and PID of the process issuing the message.\n"
" long — Display all metadata fields, separate messages with blank lines.\n"
" process — Display PID only.\n"
" raw — Display the raw log message, with no other metadata fields.\n"
" tag — Display the priority/tag only.\n"
" thread — Display priority, PID and TID of process issuing the message.\n"
" threadtime — Display the date, invocation time, priority, tag, and the PID\n"
" and TID of the thread issuing the message. (the default format).\n"
" time — Display the date, invocation time, priority/tag, and PID of the\n"
" process issuing the message.\n"
"\nAdverb modifiers can be used in combination:\n"
" color — Display in highlighted color to match priority. i.e. \x1B[38;5;231mVERBOSE\n"
" \x1B[38;5;75mDEBUG \x1B[38;5;40mINFO \x1B[38;5;166mWARNING \x1B[38;5;196mERROR FATAL\x1B[0m\n"
" descriptive — events logs only, descriptions from event-log-tags database.\n"
" epoch — Display time as seconds since Jan 1 1970.\n"
" monotonic — Display time as cpu seconds since last boot.\n"
" printable — Ensure that any binary logging content is escaped.\n"
" uid — If permitted, display the UID or Android ID of logged process.\n"
" usec — Display time down the microsecond precision.\n"
" UTC — Display time as UTC.\n"
" year — Add the year to the displayed time.\n"
" zone — Add the local timezone to the displayed time.\n"
" \"<zone>\" — Print using this public named timezone (experimental).\n\n"
);
}
// clang-format on
static int setLogFormat(android_logcat_context_internal* context,
const char* formatString) {
AndroidLogPrintFormat format;
format = android_log_formatFromString(formatString);
// invalid string?
if (format == FORMAT_OFF) return -1;
return android_log_setPrintFormat(context->logformat, format);
}
static const char multipliers[][2] = { { "" }, { "K" }, { "M" }, { "G" } };
static unsigned long value_of_size(unsigned long value) {
for (unsigned i = 0;
(i < sizeof(multipliers) / sizeof(multipliers[0])) && (value >= 1024);
value /= 1024, ++i)
;
return value;
}
static const char* multiplier_of_size(unsigned long value) {
unsigned i;
for (i = 0;
(i < sizeof(multipliers) / sizeof(multipliers[0])) && (value >= 1024);
value /= 1024, ++i)
;
return multipliers[i];
}
// String to unsigned int, returns -1 if it fails
static bool getSizeTArg(const char* ptr, size_t* val, size_t min = 0,
size_t max = SIZE_MAX) {
if (!ptr) return false;
char* endp;
errno = 0;
size_t ret = (size_t)strtoll(ptr, &endp, 0);
if (endp[0] || errno) return false;
if ((ret > max) || (ret < min)) return false;
*val = ret;
return true;
}
static void logcat_panic(android_logcat_context_internal* context,
enum helpType showHelp, const char* fmt, ...) {
context->retval = EXIT_FAILURE;
if (!context->error) {
context->stop = true;
return;
}
va_list args;
va_start(args, fmt);
vfprintf(context->error, fmt, args);
va_end(args);
switch (showHelp) {
case HELP_TRUE:
show_help(context);
break;
case HELP_FORMAT:
show_format_help(context);
break;
case HELP_FALSE:
default:
break;
}
context->stop = true;
}
static char* parseTime(log_time& t, const char* cp) {
char* ep = t.strptime(cp, "%m-%d %H:%M:%S.%q");
if (ep) return ep;
ep = t.strptime(cp, "%Y-%m-%d %H:%M:%S.%q");
if (ep) return ep;
return t.strptime(cp, "%s.%q");
}
// Find last logged line in <outputFileName>, or <outputFileName>.1
static log_time lastLogTime(const char* outputFileName) {
log_time retval(log_time::EPOCH);
if (!outputFileName) return retval;
std::string directory;
const char* file = strrchr(outputFileName, '/');
if (!file) {
directory = ".";
file = outputFileName;
} else {
directory = std::string(outputFileName, file - outputFileName);
++file;
}
std::unique_ptr<DIR, int (*)(DIR*)> dir(opendir(directory.c_str()),
closedir);
if (!dir.get()) return retval;
log_time now(android_log_clockid());
size_t len = strlen(file);
log_time modulo(0, NS_PER_SEC);
struct dirent* dp;
while (!!(dp = readdir(dir.get()))) {
if ((dp->d_type != DT_REG) || !!strncmp(dp->d_name, file, len) ||
(dp->d_name[len] && ((dp->d_name[len] != '.') ||
(strtoll(dp->d_name + 1, nullptr, 10) != 1)))) {
continue;
}
std::string file_name = directory;
file_name += "/";
file_name += dp->d_name;
std::string file;
if (!android::base::ReadFileToString(file_name, &file)) continue;
bool found = false;
for (const auto& line : android::base::Split(file, "\n")) {
log_time t(log_time::EPOCH);
char* ep = parseTime(t, line.c_str());
if (!ep || (*ep != ' ')) continue;
// determine the time precision of the logs (eg: msec or usec)
for (unsigned long mod = 1UL; mod < modulo.tv_nsec; mod *= 10) {
if (t.tv_nsec % (mod * 10)) {
modulo.tv_nsec = mod;
break;
}
}
// We filter any times later than current as we may not have the
// year stored with each log entry. Also, since it is possible for
// entries to be recorded out of order (very rare) we select the
// maximum we find just in case.
if ((t < now) && (t > retval)) {
retval = t;
found = true;
}
}
// We count on the basename file to be the definitive end, so stop here.
if (!dp->d_name[len] && found) break;
}
if (retval == log_time::EPOCH) return retval;
// tail_time prints matching or higher, round up by the modulo to prevent
// a replay of the last entry we have just checked.
retval += modulo;
return retval;
}
const char* getenv(android_logcat_context_internal* context, const char* name) {
if (!context->envp || !name || !*name) return nullptr;
for (size_t len = strlen(name), i = 0; context->envp[i]; ++i) {
if (strncmp(context->envp[i], name, len)) continue;
if (context->envp[i][len] == '=') return &context->envp[i][len + 1];
}
return nullptr;
}
} // namespace android
void reportErrorName(const char** current, const char* name,
bool blockSecurity) {
if (*current) return;
if (!blockSecurity || (android_name_to_log_id(name) != LOG_ID_SECURITY)) {
*current = name;
}
}
static int __logcat(android_logcat_context_internal* context) {
using namespace android;
int err;
bool hasSetLogFormat = false;
bool clearLog = false;
bool allSelected = false;
bool getLogSize = false;
bool getPruneList = false;
bool printStatistics = false;
bool printDividers = false;
unsigned long setLogSize = 0;
const char* setPruneList = nullptr;
const char* setId = nullptr;
int mode = ANDROID_LOG_RDONLY;
std::string forceFilters;
log_device_t* dev;
struct logger_list* logger_list;
size_t tail_lines = 0;
log_time tail_time(log_time::EPOCH);
size_t pid = 0;
bool got_t = false;
// object instantiations before goto's can happen
log_device_t unexpected("unexpected", false);
const char* openDeviceFail = nullptr;
const char* clearFail = nullptr;
const char* setSizeFail = nullptr;
const char* getSizeFail = nullptr;
int argc = context->argc;
char* const* argv = context->argv;
context->output = stdout;
context->error = stderr;
for (int i = 0; i < argc; ++i) {
// Simulate shell stderr redirect parsing
if ((argv[i][0] != '2') || (argv[i][1] != '>')) continue;
// Append to file not implemented, just open file
size_t skip = (argv[i][2] == '>') + 2;
if (!strcmp(&argv[i][skip], "/dev/null")) {
context->stderr_null = true;
} else if (!strcmp(&argv[i][skip], "&1")) {
context->stderr_stdout = true;
} else {
// stderr file redirections are not supported
fprintf(context->stderr_stdout ? stdout : stderr,
"stderr redirection to file %s unsupported, skipping\n",
&argv[i][skip]);
}
// Only the first one
break;
}
const char* filename = nullptr;
for (int i = 0; i < argc; ++i) {
// Simulate shell stdout redirect parsing
if (argv[i][0] != '>') continue;
// Append to file not implemented, just open file
filename = &argv[i][(argv[i][1] == '>') + 1];
// Only the first one
break;
}
// Deal with setting up file descriptors and FILE pointers
if (context->error_fd >= 0) { // Is an error file descriptor supplied?
if (context->error_fd == context->output_fd) {
context->stderr_stdout = true;
} else if (context->stderr_null) { // redirection told us to close it
close(context->error_fd);
context->error_fd = -1;
} else { // All Ok, convert error to a FILE pointer
context->error = fdopen(context->error_fd, "web");
if (!context->error) {
context->retval = -errno;
fprintf(context->stderr_stdout ? stdout : stderr,
"Failed to fdopen(error_fd=%d) %s\n", context->error_fd,
strerror(errno));
goto exit;
}
}
}
if (context->output_fd >= 0) { // Is an output file descriptor supplied?
if (filename) { // redirect to file, close supplied file descriptor.
close(context->output_fd);
context->output_fd = -1;
} else { // All Ok, convert output to a FILE pointer
context->output = fdopen(context->output_fd, "web");
if (!context->output) {
context->retval = -errno;
fprintf(context->stderr_stdout ? stdout : context->error,
"Failed to fdopen(output_fd=%d) %s\n",
context->output_fd, strerror(errno));
goto exit;
}
}
}
if (filename) { // We supplied an output file redirected in command line
context->output = fopen(filename, "web");
}
// Deal with 2>&1
if (context->stderr_stdout) context->error = context->output;
// Deal with 2>/dev/null
if (context->stderr_null) {
context->error_fd = -1;
context->error = nullptr;
}
// Only happens if output=stdout or output=filename
if ((context->output_fd < 0) && context->output) {
context->output_fd = fileno(context->output);
}
// Only happens if error=stdout || error=stderr
if ((context->error_fd < 0) && context->error) {
context->error_fd = fileno(context->error);
}
context->logformat = android_log_format_new();
if (argc == 2 && !strcmp(argv[1], "--help")) {
show_help(context);
context->retval = EXIT_SUCCESS;
goto exit;
}
// meant to catch comma-delimited values, but cast a wider
// net for stability dealing with possible mistaken inputs.
static const char delimiters[] = ",:; \t\n\r\f";
struct getopt_context optctx;
INIT_GETOPT_CONTEXT(optctx);
optctx.opterr = !!context->error;
optctx.optstderr = context->error;
for (;;) {
int ret;
int option_index = 0;
// list of long-argument only strings for later comparison
static const char pid_str[] = "pid";
static const char debug_str[] = "debug";
static const char id_str[] = "id";
static const char wrap_str[] = "wrap";
static const char print_str[] = "print";
// clang-format off
static const struct option long_options[] = {
{ "binary", no_argument, nullptr, 'B' },
{ "buffer", required_argument, nullptr, 'b' },
{ "buffer-size", optional_argument, nullptr, 'g' },
{ "clear", no_argument, nullptr, 'c' },
{ debug_str, no_argument, nullptr, 0 },
{ "dividers", no_argument, nullptr, 'D' },
{ "file", required_argument, nullptr, 'f' },
{ "format", required_argument, nullptr, 'v' },
// hidden and undocumented reserved alias for --regex
{ "grep", required_argument, nullptr, 'e' },
// hidden and undocumented reserved alias for --max-count
{ "head", required_argument, nullptr, 'm' },
{ "help", no_argument, nullptr, 'h' },
{ id_str, required_argument, nullptr, 0 },
{ "last", no_argument, nullptr, 'L' },
{ "max-count", required_argument, nullptr, 'm' },
{ pid_str, required_argument, nullptr, 0 },
{ print_str, no_argument, nullptr, 0 },
{ "prune", optional_argument, nullptr, 'p' },
{ "regex", required_argument, nullptr, 'e' },
{ "rotate-count", required_argument, nullptr, 'n' },
{ "rotate-kbytes", required_argument, nullptr, 'r' },
{ "statistics", no_argument, nullptr, 'S' },
// hidden and undocumented reserved alias for -t
{ "tail", required_argument, nullptr, 't' },
// support, but ignore and do not document, the optional argument
{ wrap_str, optional_argument, nullptr, 0 },
{ nullptr, 0, nullptr, 0 }
};
// clang-format on
ret = getopt_long_r(argc, argv, ":cdDhLt:T:gG:sQf:r:n:v:b:BSpP:m:e:",
long_options, &option_index, &optctx);
if (ret < 0) break;
switch (ret) {
case 0:
// only long options
if (long_options[option_index].name == pid_str) {
// ToDo: determine runtime PID_MAX?
if (!getSizeTArg(optctx.optarg, &pid, 1)) {
logcat_panic(context, HELP_TRUE, "%s %s out of range\n",
long_options[option_index].name,
optctx.optarg);
goto exit;
}
break;
}
if (long_options[option_index].name == wrap_str) {
mode |= ANDROID_LOG_WRAP | ANDROID_LOG_RDONLY |
ANDROID_LOG_NONBLOCK;
// ToDo: implement API that supports setting a wrap timeout
size_t dummy = ANDROID_LOG_WRAP_DEFAULT_TIMEOUT;
if (optctx.optarg &&
!getSizeTArg(optctx.optarg, &dummy, 1)) {
logcat_panic(context, HELP_TRUE, "%s %s out of range\n",
long_options[option_index].name,
optctx.optarg);
goto exit;
}
if ((dummy != ANDROID_LOG_WRAP_DEFAULT_TIMEOUT) &&
context->error) {
fprintf(context->error,
"WARNING: %s %u seconds, ignoring %zu\n",
long_options[option_index].name,
ANDROID_LOG_WRAP_DEFAULT_TIMEOUT, dummy);
}
break;
}
if (long_options[option_index].name == print_str) {
context->printItAnyways = true;
break;
}
if (long_options[option_index].name == debug_str) {
context->debug = true;
break;
}
if (long_options[option_index].name == id_str) {
setId = (optctx.optarg && optctx.optarg[0]) ? optctx.optarg
: nullptr;
}
break;
case 's':
// default to all silent
android_log_addFilterRule(context->logformat, "*:s");
break;
case 'c':
clearLog = true;
mode |= ANDROID_LOG_WRONLY;
break;
case 'L':
mode |= ANDROID_LOG_RDONLY | ANDROID_LOG_PSTORE |
ANDROID_LOG_NONBLOCK;
break;
case 'd':
mode |= ANDROID_LOG_RDONLY | ANDROID_LOG_NONBLOCK;
break;
case 't':
got_t = true;
mode |= ANDROID_LOG_RDONLY | ANDROID_LOG_NONBLOCK;
// FALLTHRU
case 'T':
if (strspn(optctx.optarg, "0123456789") !=
strlen(optctx.optarg)) {
char* cp = parseTime(tail_time, optctx.optarg);
if (!cp) {
logcat_panic(context, HELP_FALSE,
"-%c \"%s\" not in time format\n", ret,
optctx.optarg);
goto exit;
}
if (*cp) {
char c = *cp;
*cp = '\0';
if (context->error) {
fprintf(
context->error,
"WARNING: -%c \"%s\"\"%c%s\" time truncated\n",
ret, optctx.optarg, c, cp + 1);
}
*cp = c;
}
} else {
if (!getSizeTArg(optctx.optarg, &tail_lines, 1)) {
if (context->error) {
fprintf(context->error,
"WARNING: -%c %s invalid, setting to 1\n",
ret, optctx.optarg);
}
tail_lines = 1;
}
}
break;
case 'D':
printDividers = true;
break;
case 'e':
context->regex = new pcrecpp::RE(optctx.optarg);
break;
case 'm': {
char* end = nullptr;
if (!getSizeTArg(optctx.optarg, &context->maxCount)) {
logcat_panic(context, HELP_FALSE,
"-%c \"%s\" isn't an "
"integer greater than zero\n",
ret, optctx.optarg);
goto exit;
}
} break;
case 'g':
if (!optctx.optarg) {
getLogSize = true;
break;
}
// FALLTHRU
case 'G': {
char* cp;
if (strtoll(optctx.optarg, &cp, 0) > 0) {
setLogSize = strtoll(optctx.optarg, &cp, 0);
} else {
setLogSize = 0;
}
switch (*cp) {
case 'g':
case 'G':
setLogSize *= 1024;
// FALLTHRU
case 'm':
case 'M':
setLogSize *= 1024;
// FALLTHRU
case 'k':
case 'K':
setLogSize *= 1024;
// FALLTHRU
case '\0':
break;
default:
setLogSize = 0;
}
if (!setLogSize) {
logcat_panic(context, HELP_FALSE,
"ERROR: -G <num><multiplier>\n");
goto exit;
}
} break;
case 'p':
if (!optctx.optarg) {
getPruneList = true;
break;
}
// FALLTHRU
case 'P':
setPruneList = optctx.optarg;
break;
case 'b': {
std::unique_ptr<char, void (*)(void*)> buffers(
strdup(optctx.optarg), free);
char* arg = buffers.get();
unsigned idMask = 0;
char* sv = nullptr; // protect against -ENOMEM above
while (!!(arg = strtok_r(arg, delimiters, &sv))) {
if (!strcmp(arg, "default")) {
idMask |= (1 << LOG_ID_MAIN) | (1 << LOG_ID_SYSTEM) |
(1 << LOG_ID_CRASH);
} else if (!strcmp(arg, "all")) {
allSelected = true;
idMask = (unsigned)-1;
} else {
log_id_t log_id = android_name_to_log_id(arg);
const char* name = android_log_id_to_name(log_id);
if (!!strcmp(name, arg)) {
logcat_panic(context, HELP_TRUE,
"unknown buffer %s\n", arg);
goto exit;
}
if (log_id == LOG_ID_SECURITY) allSelected = false;
idMask |= (1 << log_id);
}
arg = nullptr;
}
for (int i = LOG_ID_MIN; i < LOG_ID_MAX; ++i) {
const char* name = android_log_id_to_name((log_id_t)i);
log_id_t log_id = android_name_to_log_id(name);
if (log_id != (log_id_t)i) continue;
if (!(idMask & (1 << i))) continue;
bool found = false;
for (dev = context->devices; dev; dev = dev->next) {
if (!strcmp(name, dev->device)) {
found = true;
break;
}
if (!dev->next) break;
}
if (found) continue;
bool binary =
!strcmp(name, "events") || !strcmp(name, "security");
log_device_t* d = new log_device_t(name, binary);
if (dev) {
dev->next = d;
dev = d;
} else {
context->devices = dev = d;
}
context->devCount++;
}
} break;
case 'B':
context->printBinary = 1;
break;
case 'f':
if ((tail_time == log_time::EPOCH) && !tail_lines) {
tail_time = lastLogTime(optctx.optarg);
}
// redirect output to a file
context->outputFileName = optctx.optarg;
break;
case 'r':
if (!getSizeTArg(optctx.optarg, &context->logRotateSizeKBytes,
1)) {
logcat_panic(context, HELP_TRUE,
"Invalid parameter \"%s\" to -r\n",
optctx.optarg);
goto exit;
}
break;
case 'n':
if (!getSizeTArg(optctx.optarg, &context->maxRotatedLogs, 1)) {
logcat_panic(context, HELP_TRUE,
"Invalid parameter \"%s\" to -n\n",
optctx.optarg);
goto exit;
}
break;
case 'v': {
if (!strcmp(optctx.optarg, "help") ||
!strcmp(optctx.optarg, "--help")) {
show_format_help(context);
context->retval = EXIT_SUCCESS;
goto exit;
}
std::unique_ptr<char, void (*)(void*)> formats(
strdup(optctx.optarg), free);
char* arg = formats.get();
unsigned idMask = 0;
char* sv = nullptr; // protect against -ENOMEM above
while (!!(arg = strtok_r(arg, delimiters, &sv))) {
err = setLogFormat(context, arg);
if (err < 0) {
logcat_panic(context, HELP_FORMAT,
"Invalid parameter \"%s\" to -v\n", arg);
goto exit;
}
arg = nullptr;
if (err) hasSetLogFormat = true;
}
} break;
case 'Q':
#define LOGCAT_FILTER "androidboot.logcat="
#define CONSOLE_PIPE_OPTION "androidboot.consolepipe="
#define CONSOLE_OPTION "androidboot.console="
#define QEMU_PROPERTY "ro.kernel.qemu"
#define QEMU_CMDLINE "qemu.cmdline"
// This is a *hidden* option used to start a version of logcat
// in an emulated device only. It basically looks for
// androidboot.logcat= on the kernel command line. If
// something is found, it extracts a log filter and uses it to
// run the program. The logcat output will go to consolepipe if
// androiboot.consolepipe (e.g. qemu_pipe) is given, otherwise,
// it goes to androidboot.console (e.g. tty)
{
// if not in emulator, exit quietly
if (false == android::base::GetBoolProperty(QEMU_PROPERTY, false)) {
context->retval = EXIT_SUCCESS;
goto exit;
}
std::string cmdline = android::base::GetProperty(QEMU_CMDLINE, "");
if (cmdline.empty()) {
android::base::ReadFileToString("/proc/cmdline", &cmdline);
}
const char* logcatFilter = strstr(cmdline.c_str(), LOGCAT_FILTER);
// if nothing found or invalid filters, exit quietly
if (!logcatFilter) {
context->retval = EXIT_SUCCESS;
goto exit;
}
const char* p = logcatFilter + strlen(LOGCAT_FILTER);
const char* q = strpbrk(p, " \t\n\r");
if (!q) q = p + strlen(p);
forceFilters = std::string(p, q);
// redirect our output to the emulator console pipe or console
const char* consolePipe =
strstr(cmdline.c_str(), CONSOLE_PIPE_OPTION);
const char* console =
strstr(cmdline.c_str(), CONSOLE_OPTION);
if (consolePipe) {
p = consolePipe + strlen(CONSOLE_PIPE_OPTION);
} else if (console) {
p = console + strlen(CONSOLE_OPTION);
} else {
context->retval = EXIT_FAILURE;
goto exit;
}
q = strpbrk(p, " \t\n\r");
int len = q ? q - p : strlen(p);
std::string devname = "/dev/" + std::string(p, len);
std::string pipePurpose("pipe:logcat");
if (consolePipe) {
// example: "qemu_pipe,pipe:logcat"
// upon opening of /dev/qemu_pipe, the "pipe:logcat"
// string with trailing '\0' should be written to the fd
size_t pos = devname.find(",");
if (pos != std::string::npos) {
pipePurpose = devname.substr(pos + 1);
devname = devname.substr(0, pos);
}
}
cmdline.erase();
if (context->error) {
fprintf(context->error, "logcat using %s\n",
devname.c_str());
}
FILE* fp = fopen(devname.c_str(), "web");
devname.erase();
if (!fp) break;
if (consolePipe) {
// need the trailing '\0'
if(!android::base::WriteFully(fileno(fp), pipePurpose.c_str(),
pipePurpose.size() + 1)) {
fclose(fp);
context->retval = EXIT_FAILURE;
goto exit;
}
}
// close output and error channels, replace with console
android::close_output(context);
android::close_error(context);
context->stderr_stdout = true;
context->output = fp;
context->output_fd = fileno(fp);
if (context->stderr_null) break;
context->stderr_stdout = true;
context->error = fp;
context->error_fd = fileno(fp);
}
break;
case 'S':
printStatistics = true;
break;
case ':':
logcat_panic(context, HELP_TRUE,
"Option -%c needs an argument\n", optctx.optopt);
goto exit;
case 'h':
show_help(context);
show_format_help(context);
goto exit;
default:
logcat_panic(context, HELP_TRUE, "Unrecognized Option %c\n",
optctx.optopt);
goto exit;
}
}
if (context->maxCount && got_t) {
logcat_panic(context, HELP_TRUE,
"Cannot use -m (--max-count) and -t together\n");
goto exit;
}
if (context->printItAnyways && (!context->regex || !context->maxCount)) {
// One day it would be nice if --print -v color and --regex <expr>
// could play with each other and show regex highlighted content.
// clang-format off
if (context->error) {
fprintf(context->error, "WARNING: "
"--print ignored, to be used in combination with\n"
" "
"--regex <expr> and --max-count <N>\n");
}
context->printItAnyways = false;
}
if (!context->devices) {
dev = context->devices = new log_device_t("main", false);
context->devCount = 1;
if (android_name_to_log_id("system") == LOG_ID_SYSTEM) {
dev = dev->next = new log_device_t("system", false);
context->devCount++;
}
if (android_name_to_log_id("crash") == LOG_ID_CRASH) {
dev = dev->next = new log_device_t("crash", false);
context->devCount++;
}
}
if (!!context->logRotateSizeKBytes && !context->outputFileName) {
logcat_panic(context, HELP_TRUE, "-r requires -f as well\n");
goto exit;
}
if (!!setId) {
if (!context->outputFileName) {
logcat_panic(context, HELP_TRUE,
"--id='%s' requires -f as well\n", setId);
goto exit;
}
std::string file_name = android::base::StringPrintf(
"%s.id", context->outputFileName);
std::string file;
bool file_ok = android::base::ReadFileToString(file_name, &file);
android::base::WriteStringToFile(setId, file_name, S_IRUSR | S_IWUSR,
getuid(), getgid());
if (!file_ok || !file.compare(setId)) setId = nullptr;
}
if (!hasSetLogFormat) {
const char* logFormat = android::getenv(context, "ANDROID_PRINTF_LOG");
if (!!logFormat) {
std::unique_ptr<char, void (*)(void*)> formats(strdup(logFormat),
free);
char* sv = nullptr; // protect against -ENOMEM above
char* arg = formats.get();
while (!!(arg = strtok_r(arg, delimiters, &sv))) {
err = setLogFormat(context, arg);
// environment should not cause crash of logcat
if ((err < 0) && context->error) {
fprintf(context->error,
"invalid format in ANDROID_PRINTF_LOG '%s'\n", arg);
}
arg = nullptr;
if (err > 0) hasSetLogFormat = true;
}
}
if (!hasSetLogFormat) {
setLogFormat(context, "threadtime");
}
}
if (forceFilters.size()) {
err = android_log_addFilterString(context->logformat,
forceFilters.c_str());
if (err < 0) {
logcat_panic(context, HELP_FALSE,
"Invalid filter expression in logcat args\n");
goto exit;
}
} else if (argc == optctx.optind) {
// Add from environment variable
const char* env_tags_orig = android::getenv(context, "ANDROID_LOG_TAGS");
if (!!env_tags_orig) {
err = android_log_addFilterString(context->logformat,
env_tags_orig);
if (err < 0) {
logcat_panic(context, HELP_TRUE,
"Invalid filter expression in ANDROID_LOG_TAGS\n");
goto exit;
}
}
} else {
// Add from commandline
for (int i = optctx.optind ; i < argc ; i++) {
// skip stderr redirections of _all_ kinds
if ((argv[i][0] == '2') && (argv[i][1] == '>')) continue;
// skip stdout redirections of _all_ kinds
if (argv[i][0] == '>') continue;
err = android_log_addFilterString(context->logformat, argv[i]);
if (err < 0) {
logcat_panic(context, HELP_TRUE,
"Invalid filter expression '%s'\n", argv[i]);
goto exit;
}
}
}
dev = context->devices;
if (tail_time != log_time::EPOCH) {
logger_list = android_logger_list_alloc_time(mode, tail_time, pid);
} else {
logger_list = android_logger_list_alloc(mode, tail_lines, pid);
}
// We have three orthogonal actions below to clear, set log size and
// get log size. All sharing the same iteration loop.
while (dev) {
dev->logger_list = logger_list;
dev->logger = android_logger_open(logger_list,
android_name_to_log_id(dev->device));
if (!dev->logger) {
reportErrorName(&openDeviceFail, dev->device, allSelected);
dev = dev->next;
continue;
}
if (clearLog || setId) {
if (context->outputFileName) {
int maxRotationCountDigits =
(context->maxRotatedLogs > 0) ?
(int)(floor(log10(context->maxRotatedLogs) + 1)) :
0;
for (int i = context->maxRotatedLogs ; i >= 0 ; --i) {
std::string file;
if (!i) {
file = android::base::StringPrintf(
"%s", context->outputFileName);
} else {
file = android::base::StringPrintf("%s.%.*d",
context->outputFileName, maxRotationCountDigits, i);
}
if (!file.length()) {
perror("while clearing log files");
reportErrorName(&clearFail, dev->device, allSelected);
break;
}
err = unlink(file.c_str());
if (err < 0 && errno != ENOENT && !clearFail) {
perror("while clearing log files");
reportErrorName(&clearFail, dev->device, allSelected);
}
}
} else if (android_logger_clear(dev->logger)) {
reportErrorName(&clearFail, dev->device, allSelected);
}
}
if (setLogSize) {
if (android_logger_set_log_size(dev->logger, setLogSize)) {
reportErrorName(&setSizeFail, dev->device, allSelected);
}
}
if (getLogSize) {
long size = android_logger_get_log_size(dev->logger);
long readable = android_logger_get_log_readable_size(dev->logger);
if ((size < 0) || (readable < 0)) {
reportErrorName(&getSizeFail, dev->device, allSelected);
} else {
std::string str = android::base::StringPrintf(
"%s: ring buffer is %ld%sb (%ld%sb consumed),"
" max entry is %db, max payload is %db\n",
dev->device,
value_of_size(size), multiplier_of_size(size),
value_of_size(readable), multiplier_of_size(readable),
(int)LOGGER_ENTRY_MAX_LEN,
(int)LOGGER_ENTRY_MAX_PAYLOAD);
TEMP_FAILURE_RETRY(write(context->output_fd,
str.data(), str.length()));
}
}
dev = dev->next;
}
context->retval = EXIT_SUCCESS;
// report any errors in the above loop and exit
if (openDeviceFail) {
logcat_panic(context, HELP_FALSE,
"Unable to open log device '%s'\n", openDeviceFail);
goto close;
}
if (clearFail) {
logcat_panic(context, HELP_FALSE,
"failed to clear the '%s' log\n", clearFail);
goto close;
}
if (setSizeFail) {
logcat_panic(context, HELP_FALSE,
"failed to set the '%s' log size\n", setSizeFail);
goto close;
}
if (getSizeFail) {
logcat_panic(context, HELP_FALSE,
"failed to get the readable '%s' log size", getSizeFail);
goto close;
}
if (setPruneList) {
size_t len = strlen(setPruneList);
// extra 32 bytes are needed by android_logger_set_prune_list
size_t bLen = len + 32;
char* buf = nullptr;
if (asprintf(&buf, "%-*s", (int)(bLen - 1), setPruneList) > 0) {
buf[len] = '\0';
if (android_logger_set_prune_list(logger_list, buf, bLen)) {
logcat_panic(context, HELP_FALSE,
"failed to set the prune list");
}
free(buf);
} else {
logcat_panic(context, HELP_FALSE,
"failed to set the prune list (alloc)");
}
goto close;
}
if (printStatistics || getPruneList) {
size_t len = 8192;
char* buf;
for (int retry = 32; (retry >= 0) && ((buf = new char[len]));
delete[] buf, buf = nullptr, --retry) {
if (getPruneList) {
android_logger_get_prune_list(logger_list, buf, len);
} else {
android_logger_get_statistics(logger_list, buf, len);
}
buf[len - 1] = '\0';
if (atol(buf) < 3) {
delete[] buf;
buf = nullptr;
break;
}
size_t ret = atol(buf) + 1;
if (ret <= len) {
len = ret;
break;
}
len = ret;
}
if (!buf) {
logcat_panic(context, HELP_FALSE, "failed to read data");
goto close;
}
// remove trailing FF
char* cp = buf + len - 1;
*cp = '\0';
bool truncated = *--cp != '\f';
if (!truncated) *cp = '\0';
// squash out the byte count
cp = buf;
if (!truncated) {
while (isdigit(*cp)) ++cp;
if (*cp == '\n') ++cp;
}
len = strlen(cp);
TEMP_FAILURE_RETRY(write(context->output_fd, cp, len));
delete[] buf;
goto close;
}
if (getLogSize || setLogSize || clearLog) goto close;
setupOutputAndSchedulingPolicy(context, !(mode & ANDROID_LOG_NONBLOCK));
if (context->stop) goto close;
// LOG_EVENT_INT(10, 12345);
// LOG_EVENT_LONG(11, 0x1122334455667788LL);
// LOG_EVENT_STRING(0, "whassup, doc?");
dev = nullptr;
while (!context->stop &&
(!context->maxCount || (context->printCount < context->maxCount))) {
struct log_msg log_msg;
int ret = android_logger_list_read(logger_list, &log_msg);
if (!ret) {
logcat_panic(context, HELP_FALSE, "read: unexpected EOF!\n");
break;
}
if (ret < 0) {
if (ret == -EAGAIN) break;
if (ret == -EIO) {
logcat_panic(context, HELP_FALSE, "read: unexpected EOF!\n");
break;
}
if (ret == -EINVAL) {
logcat_panic(context, HELP_FALSE, "read: unexpected length.\n");
break;
}
logcat_panic(context, HELP_FALSE, "logcat read failure");
break;
}
log_device_t* d;
for (d = context->devices; d; d = d->next) {
if (android_name_to_log_id(d->device) == log_msg.id()) break;
}
if (!d) {
context->devCount = 2; // set to Multiple
d = &unexpected;
d->binary = log_msg.id() == LOG_ID_EVENTS;
}
if (dev != d) {
dev = d;
maybePrintStart(context, dev, printDividers);
if (context->stop) break;
}
if (context->printBinary) {
printBinary(context, &log_msg);
} else {
processBuffer(context, dev, &log_msg);
}
}
close:
// Short and sweet. Implemented generic version in android_logcat_destroy.
while (!!(dev = context->devices)) {
context->devices = dev->next;
delete dev;
}
android_logger_list_free(logger_list);
exit:
// close write end of pipe to help things along
if (context->output_fd == context->fds[1]) {
android::close_output(context);
}
if (context->error_fd == context->fds[1]) {
android::close_error(context);
}
if (context->fds[1] >= 0) {
// NB: should be closed by the above
int save_errno = errno;
close(context->fds[1]);
errno = save_errno;
context->fds[1] = -1;
}
context->thread_stopped = true;
return context->retval;
}
// Can block
int android_logcat_run_command(android_logcat_context ctx,
int output, int error,
int argc, char* const* argv,
char* const* envp) {
android_logcat_context_internal* context = ctx;
context->output_fd = output;
context->error_fd = error;
context->argc = argc;
context->argv = argv;
context->envp = envp;
context->stop = false;
context->thread_stopped = false;
return __logcat(context);
}
// starts a thread, opens a pipe, returns reading end.
int android_logcat_run_command_thread(android_logcat_context ctx,
int argc, char* const* argv,
char* const* envp) {
android_logcat_context_internal* context = ctx;
int save_errno = EBUSY;
if ((context->fds[0] >= 0) || (context->fds[1] >= 0)) goto exit;
if (pipe(context->fds) < 0) {
save_errno = errno;
goto exit;
}
pthread_attr_t attr;
if (pthread_attr_init(&attr)) {
save_errno = errno;
goto close_exit;
}
struct sched_param param;
memset(&param, 0, sizeof(param));
pthread_attr_setschedparam(&attr, &param);
pthread_attr_setschedpolicy(&attr, SCHED_BATCH);
if (pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED)) {
int save_errno = errno;
goto pthread_attr_exit;
}
context->stop = false;
context->thread_stopped = false;
context->output_fd = context->fds[1];
// save off arguments so they remain while thread is active.
for (int i = 0; i < argc; ++i) {
context->args.push_back(std::string(argv[i]));
}
// save off environment so they remain while thread is active.
if (envp) for (size_t i = 0; envp[i]; ++i) {
context->envs.push_back(std::string(envp[i]));
}
for (auto& str : context->args) {
context->argv_hold.push_back(str.c_str());
}
context->argv_hold.push_back(nullptr);
for (auto& str : context->envs) {
context->envp_hold.push_back(str.c_str());
}
context->envp_hold.push_back(nullptr);
context->argc = context->argv_hold.size() - 1;
context->argv = (char* const*)&context->argv_hold[0];
context->envp = (char* const*)&context->envp_hold[0];
#ifdef DEBUG
fprintf(stderr, "argv[%d] = {", context->argc);
for (auto str : context->argv_hold) {
fprintf(stderr, " \"%s\"", str ?: "nullptr");
}
fprintf(stderr, " }\n");
fflush(stderr);
#endif
context->retval = EXIT_SUCCESS;
if (pthread_create(&context->thr, &attr,
(void*(*)(void*))__logcat, context)) {
int save_errno = errno;
goto argv_exit;
}
pthread_attr_destroy(&attr);
return context->fds[0];
argv_exit:
context->argv_hold.clear();
context->args.clear();
context->envp_hold.clear();
context->envs.clear();
pthread_attr_exit:
pthread_attr_destroy(&attr);
close_exit:
close(context->fds[0]);
context->fds[0] = -1;
close(context->fds[1]);
context->fds[1] = -1;
exit:
errno = save_errno;
context->stop = true;
context->thread_stopped = true;
context->retval = EXIT_FAILURE;
return -1;
}
// test if the thread is still doing 'stuff'
int android_logcat_run_command_thread_running(android_logcat_context ctx) {
android_logcat_context_internal* context = ctx;
return context->thread_stopped == false;
}
// Finished with context
int android_logcat_destroy(android_logcat_context* ctx) {
android_logcat_context_internal* context = *ctx;
if (!context) return -EBADF;
*ctx = nullptr;
context->stop = true;
while (context->thread_stopped == false) {
// Makes me sad, replace thread_stopped with semaphore. Short lived.
sched_yield();
}
delete context->regex;
context->argv_hold.clear();
context->args.clear();
context->envp_hold.clear();
context->envs.clear();
if (context->fds[0] >= 0) {
close(context->fds[0]);
context->fds[0] = -1;
}
android::close_output(context);
android::close_error(context);
if (context->fds[1] >= 0) {
// NB: could be closed by the above fclose(s), ignore error.
int save_errno = errno;
close(context->fds[1]);
errno = save_errno;
context->fds[1] = -1;
}
android_closeEventTagMap(context->eventTagMap);
// generic cleanup of devices list to handle all possible dirty cases
log_device_t* dev;
while (!!(dev = context->devices)) {
struct logger_list* logger_list = dev->logger_list;
if (logger_list) {
for (log_device_t* d = dev; d; d = d->next) {
if (d->logger_list == logger_list) d->logger_list = nullptr;
}
android_logger_list_free(logger_list);
}
context->devices = dev->next;
delete dev;
}
int retval = context->retval;
free(context);
return retval;
}
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