4916706cfe
Also clean up the implementation of all the pty functions, add tests, and fix the stub implementations of ttyname(3) and ttyname_r(3). Bug: https://code.google.com/p/android/issues/detail?id=58888 Change-Id: I0fb36438cd1abf8d4e87c29415f03db9ba13c3c2
107 lines
2.7 KiB
C++
107 lines
2.7 KiB
C++
/*
|
|
* Copyright (C) 2008 The Android Open Source Project
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
|
|
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <sys/ioctl.h>
|
|
#include <termios.h>
|
|
#include <unistd.h>
|
|
|
|
int getpt(void) {
|
|
return posix_openpt(O_RDWR|O_NOCTTY);
|
|
}
|
|
|
|
int grantpt(int) {
|
|
return 0;
|
|
}
|
|
|
|
int posix_openpt(int flags) {
|
|
return open("/dev/ptmx", flags);
|
|
}
|
|
|
|
char* ptsname(int fd) {
|
|
static char buf[64];
|
|
return ptsname_r(fd, buf, sizeof(buf)) == 0 ? buf : NULL;
|
|
}
|
|
|
|
int ptsname_r(int fd, char* buf, size_t len) {
|
|
if (buf == NULL) {
|
|
errno = EINVAL;
|
|
return errno;
|
|
}
|
|
|
|
unsigned int pty_num;
|
|
if (ioctl(fd, TIOCGPTN, &pty_num) != 0) {
|
|
errno = ENOTTY;
|
|
return errno;
|
|
}
|
|
|
|
if (snprintf(buf, len, "/dev/pts/%u", pty_num) >= static_cast<int>(len)) {
|
|
errno = ERANGE;
|
|
return errno;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
char* ttyname(int fd) {
|
|
static char buf[64];
|
|
return ttyname_r(fd, buf, sizeof(buf)) == 0 ? buf : NULL;
|
|
}
|
|
|
|
int ttyname_r(int fd, char* buf, size_t len) {
|
|
if (buf == NULL) {
|
|
errno = EINVAL;
|
|
return errno;
|
|
}
|
|
|
|
if (!isatty(fd)) {
|
|
return errno;
|
|
}
|
|
|
|
char path[64];
|
|
snprintf(path, sizeof(path), "/proc/self/fd/%d", fd);
|
|
|
|
ssize_t count = readlink(path, buf, len);
|
|
if (count == -1) {
|
|
return errno;
|
|
}
|
|
if (static_cast<size_t>(count) == len) {
|
|
errno = ERANGE;
|
|
return errno;
|
|
}
|
|
buf[count] = '\0';
|
|
return 0;
|
|
}
|
|
|
|
int unlockpt(int fd) {
|
|
int unlock = 0;
|
|
return ioctl(fd, TIOCSPTLCK, &unlock);
|
|
}
|