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gvfs/daemon/pty_open.c

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/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2006-2007 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
* Author: Alexander Larsson <alexl@redhat.com>
*/
/*
* Copyright (C) 2001,2002,2004 Red Hat, Inc.
*
* This is free software; you can redistribute it and/or modify it under
* the terms of the GNU Library General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* Originally from vte */
#include "config.h"
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <sys/wait.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef HAVE_SYS_UN_H
#include <sys/un.h>
#endif
#ifdef HAVE_STROPTS_H
#include <stropts.h>
#endif
#ifdef HAVE_TERMIOS_H
#include <termios.h>
#endif
#ifdef HAVE_UTMP_H
#include <utmp.h>
#endif
#ifdef HAVE_UTIL_H
#include <util.h>
#endif
#include <glib.h>
#include "pty_open.h"
#if defined(HAVE_PTSNAME_R) || defined(HAVE_PTSNAME) || defined(TIOCGPTN)
#define HAVE_UNIX98_PTY
#else
#undef HAVE_UNIX98_PTY
#endif
/*
* force openpty(3) on BSD
* https://bugzilla.gnome.org/show_bug.cgi?id=722001
*/
#if defined(__FreeBSD__) || defined(__OpenBSD__)
#undef HAVE_UNIX98_PTY
#endif
/* Solaris does not have the login_tty() function so implement locally. */
#ifndef HAVE_LOGIN_TTY
static int login_tty(int pts)
{
#if defined(HAVE_STROPTS_H)
/* push a terminal onto stream head */
if (ioctl(pts, I_PUSH, "ptem") == -1) return -1;
if (ioctl(pts, I_PUSH, "ldterm") == -1) return -1;
#endif
setsid();
#if defined(TIOCSCTTY)
ioctl(pts, TIOCSCTTY, 0);
#endif
dup2(pts, 0);
dup2(pts, 1);
dup2(pts, 2);
if (pts > 2) close(pts);
return 0;
}
#endif
/* Reset the handlers for all known signals to their defaults. The parent
* (or one of the libraries it links to) may have changed one to be ignored. */
static void
_pty_reset_signal_handlers(void)
{
signal(SIGHUP, SIG_DFL);
signal(SIGINT, SIG_DFL);
signal(SIGILL, SIG_DFL);
signal(SIGABRT, SIG_DFL);
signal(SIGFPE, SIG_DFL);
signal(SIGKILL, SIG_DFL);
signal(SIGSEGV, SIG_DFL);
signal(SIGPIPE, SIG_DFL);
signal(SIGALRM, SIG_DFL);
signal(SIGTERM, SIG_DFL);
signal(SIGCHLD, SIG_DFL);
signal(SIGCONT, SIG_DFL);
signal(SIGSTOP, SIG_DFL);
signal(SIGTSTP, SIG_DFL);
signal(SIGTTIN, SIG_DFL);
signal(SIGTTOU, SIG_DFL);
#ifdef SIGBUS
signal(SIGBUS, SIG_DFL);
#endif
#ifdef SIGPOLL
signal(SIGPOLL, SIG_DFL);
#endif
#ifdef SIGPROF
signal(SIGPROF, SIG_DFL);
#endif
#ifdef SIGSYS
signal(SIGSYS, SIG_DFL);
#endif
#ifdef SIGTRAP
signal(SIGTRAP, SIG_DFL);
#endif
#ifdef SIGURG
signal(SIGURG, SIG_DFL);
#endif
#ifdef SIGVTALARM
signal(SIGVTALARM, SIG_DFL);
#endif
#ifdef SIGXCPU
signal(SIGXCPU, SIG_DFL);
#endif
#ifdef SIGXFSZ
signal(SIGXFSZ, SIG_DFL);
#endif
#ifdef SIGIOT
signal(SIGIOT, SIG_DFL);
#endif
#ifdef SIGEMT
signal(SIGEMT, SIG_DFL);
#endif
#ifdef SIGSTKFLT
signal(SIGSTKFLT, SIG_DFL);
#endif
#ifdef SIGIO
signal(SIGIO, SIG_DFL);
#endif
#ifdef SIGCLD
signal(SIGCLD, SIG_DFL);
#endif
#ifdef SIGPWR
signal(SIGPWR, SIG_DFL);
#endif
#ifdef SIGINFO
signal(SIGINFO, SIG_DFL);
#endif
#ifdef SIGLOST
signal(SIGLOST, SIG_DFL);
#endif
#ifdef SIGWINCH
signal(SIGWINCH, SIG_DFL);
#endif
#ifdef SIGUNUSED
signal(SIGUNUSED, SIG_DFL);
#endif
}
#ifdef HAVE_UNIX98_PTY
#ifdef HAVE_SOCKETPAIR
static int
_pty_pipe_open(int *a, int *b)
{
int p[2], ret = -1;
#ifdef PF_UNIX
#ifdef SOCK_STREAM
ret = socketpair(PF_UNIX, SOCK_STREAM, 0, p);
#else
#ifdef SOCK_DGRAM
ret = socketpair(PF_UNIX, SOCK_DGRAM, 0, p);
#endif
#endif
if (ret == 0) {
*a = p[0];
*b = p[1];
return 0;
}
#endif
return ret;
}
#else
static int
_pty_pipe_open(int *a, int *b)
{
int p[2], ret = -1;
ret = pipe(p);
if (ret == 0) {
*a = p[0];
*b = p[1];
}
return ret;
}
#endif
static int
_pty_pipe_open_bi(int *a, int *b, int *c, int *d)
{
int ret;
ret = _pty_pipe_open(a, b);
if (ret != 0) {
return ret;
}
ret = _pty_pipe_open(c, d);
if (ret != 0) {
close(*a);
close(*b);
}
return ret;
}
/* Like read, but hide EINTR and EAGAIN. */
static ssize_t
n_read(int fd, void *buffer, size_t count)
{
size_t n = 0;
char *buf = buffer;
int i;
while (n < count) {
i = read(fd, buf + n, count - n);
switch (i) {
case 0:
return n;
break;
case -1:
switch (errno) {
case EINTR:
case EAGAIN:
#ifdef ERESTART
case ERESTART:
#endif
break;
default:
return -1;
}
break;
default:
n += i;
break;
}
}
return n;
}
/* Like write, but hide EINTR and EAGAIN. */
static ssize_t
n_write(int fd, const void *buffer, size_t count)
{
size_t n = 0;
const char *buf = buffer;
int i;
while (n < count) {
i = write(fd, buf + n, count - n);
switch (i) {
case 0:
return n;
break;
case -1:
switch (errno) {
case EINTR:
case EAGAIN:
#ifdef ERESTART
case ERESTART:
#endif
break;
default:
return -1;
}
break;
default:
n += i;
break;
}
}
return n;
}
/* Run the given command (if specified), using the given descriptor as the
* controlling terminal. */
static int
_pty_run_on_pty(int fd, gboolean login,
int stdin_fd, int stdout_fd, int stderr_fd,
int ready_reader, int ready_writer,
char **env_add, const char *command, char **argv,
const char *directory)
{
int i;
char c;
char **args, *arg;
#ifdef HAVE_STROPTS_H
if (!ioctl (fd, I_FIND, "ptem") && ioctl (fd, I_PUSH, "ptem") == -1) {
close (fd);
_exit (0);
return -1;
}
if (!ioctl (fd, I_FIND, "ldterm") && ioctl (fd, I_PUSH, "ldterm") == -1) {
close (fd);
_exit (0);
return -1;
}
if (!ioctl (fd, I_FIND, "ttcompat") && ioctl (fd, I_PUSH, "ttcompat") == -1) {
perror ("ioctl (fd, I_PUSH, \"ttcompat\")");
close (fd);
_exit (0);
return -1;
}
#endif /* HAVE_STROPTS_H */
/* Set any environment variables. */
for (i = 0; (env_add != NULL) && (env_add[i] != NULL); i++) {
if (putenv(g_strdup(env_add[i])) != 0) {
g_warning("Error adding `%s' to environment, "
"continuing.", env_add[i]);
}
}
/* Reset our signals -- our parent may have done any number of
* weird things to them. */
_pty_reset_signal_handlers();
/* Change to the requested directory. */
if (directory != NULL) {
if (chdir(directory) == -1) {
g_warning ("Error changing directory.");
}
}
#ifdef HAVE_UTMP_H
/* This sets stdin, stdout, stderr to the socket */
if (login && login_tty (fd) == -1) {
g_printerr ("mount child process login_tty failed: %s\n", g_strerror (errno));
return -1;
}
#endif
/* Signal to the parent that we've finished setting things up by
* sending an arbitrary byte over the status pipe and waiting for
* a response. This synchronization step ensures that the pty is
* fully initialized before the parent process attempts to do anything
* with it, and is required on systems where additional setup, beyond
* merely opening the device, is required. This is at least the case
* on Solaris. */
/* Initialize so valgrind doesn't complain */
c = 0;
n_write(ready_writer, &c, 1);
fsync(ready_writer);
n_read(ready_reader, &c, 1);
close(ready_writer);
if (ready_writer != ready_reader) {
close(ready_reader);
}
/* If the caller provided a command, we can't go back, ever. */
if (command != NULL) {
/* Outta here. */
if (argv != NULL) {
for (i = 0; (argv[i] != NULL); i++) ;
args = g_malloc0(sizeof(char*) * (i + 1));
for (i = 0; (argv[i] != NULL); i++) {
args[i] = g_strdup(argv[i]);
}
execvp(command, args);
} else {
arg = g_strdup(command);
execlp(command, arg, NULL);
}
/* Avoid calling any atexit() code. */
_exit(0);
g_assert_not_reached();
}
return 0;
}
static int _pty_set_size(int master, int columns, int rows);
/* Open the named PTY slave, fork off a child (storing its PID in child),
* and exec the named command in its own session as a process group leader */
static int
_pty_fork_on_pty_name(const char *path, int parent_fd, char **env_add,
const char *command, char **argv,
const char *directory,
int columns, int rows,
int *stdin_fd, int *stdout_fd, int *stderr_fd, int *slave_fd,
pid_t *child, gboolean reapchild, gboolean login)
{
int fd, i;
char c;
int ready_a[2] = { 0, 0 };
int ready_b[2] = { 0, 0 };
pid_t pid, grandchild_pid;
int pid_pipe[2];
int stdin_pipe[2];
int stdout_pipe[2];
int stderr_pipe[2];
/* Open pipes for synchronizing between parent and child. */
if (_pty_pipe_open_bi(&ready_a[0], &ready_a[1],
&ready_b[0], &ready_b[1]) == -1) {
/* Error setting up pipes. Bail. */
goto bail_ready;
}
if (reapchild && pipe(pid_pipe)) {
/* Error setting up pipes. Bail. */
goto bail_pid;
}
if (pipe(stdin_pipe)) {
/* Error setting up pipes. Bail. */
goto bail_stdin;
}
if (pipe(stdout_pipe)) {
/* Error setting up pipes. Bail. */
goto bail_stdout;
}
if (pipe(stderr_pipe)) {
/* Error setting up pipes. Bail. */
goto bail_stderr;
}
/* Open the slave PTY in the parent (but not as a controlling terminal)
* otherwise later when we want to poll the master fd, POLLHUP is
* returned if the process hasn't opened the slave side yet.
*/
*slave_fd = open(path, O_RDWR | O_NOCTTY);
if (*slave_fd == -1)
goto bail_slavefd;
/* Start up a child. */
pid = fork();
switch (pid) {
case -1:
/* Error fork()ing. Bail. */
*child = -1;
return -1;
break;
case 0:
/* Child. Close the parent's ends of the pipes. */
close(parent_fd);
close(ready_a[0]);
close(ready_b[1]);
close(stdin_pipe[1]);
close(stdout_pipe[0]);
close(stderr_pipe[0]);
/* Close the slave PTY opened in the parent. It is later
* opened as a controlling terminal. */
close (*slave_fd);
if(reapchild) {
close(pid_pipe[0]);
/* Fork a intermediate child. This is needed to not
* produce zombies! */
grandchild_pid = fork();
if (grandchild_pid < 0) {
/* Error during fork! */
n_write (pid_pipe[1], &grandchild_pid,
sizeof (grandchild_pid));
_exit (1);
} else if (grandchild_pid > 0) {
/* Parent! (This is the actual intermediate child;
* so write the pid to the parent and then exit */
n_write (pid_pipe[1], &grandchild_pid,
sizeof (grandchild_pid));
close (pid_pipe[1]);
_exit (0);
}
/* Start a new session and become process-group leader. */
setsid();
setpgid(0, 0);
}
/* Close most descriptors. */
for (i = 0; i < sysconf(_SC_OPEN_MAX); i++) {
if ((i != ready_b[0]) &&
(i != ready_a[1]) &&
(i != stdin_pipe[0]) &&
(i != stdout_pipe[1]) &&
(i != stderr_pipe[1])) {
close(i);
}
}
/* Set up stdin/out/err */
dup2(stdin_pipe[0], STDIN_FILENO);
close (stdin_pipe[0]);
dup2(stdout_pipe[1], STDOUT_FILENO);
close (stdout_pipe[1]);
dup2(stderr_pipe[1], STDERR_FILENO);
close (stderr_pipe[1]);
/* Open the slave PTY, acquiring it as the controlling terminal
* for this process and its children. */
fd = open(path, O_RDWR);
if (fd == -1) {
return -1;
}
#ifdef TIOCSCTTY
/* TIOCSCTTY is defined? Let's try that, too. */
ioctl(fd, TIOCSCTTY, fd);
#endif
/* Store 0 as the "child"'s ID to indicate to the caller that
* it is now the child. */
*child = 0;
return _pty_run_on_pty(fd, login,
stdin_pipe[1], stdout_pipe[1], stderr_pipe[1],
ready_b[0], ready_a[1],
env_add, command, argv, directory);
break;
default:
/* Parent. Close the child's ends of the pipes, do the ready
* handshake, and return the child's PID. */
close(ready_b[0]);
close(ready_a[1]);
close(stdin_pipe[0]);
close(stdout_pipe[1]);
close(stderr_pipe[1]);
if (reapchild) {
close(pid_pipe[1]);
/* Reap the intermediate child */
wait_again:
if (waitpid (pid, NULL, 0) < 0) {
if (errno == EINTR) {
goto wait_again;
} else if (errno == ECHILD) {
; /* NOOP! Child already reaped. */
} else {
g_warning ("waitpid() should not fail in pty-open.c");
}
}
/*
* Read the child pid from the pid_pipe
* */
if (n_read (pid_pipe[0], child, sizeof (pid_t))
!= sizeof (pid_t) || *child == -1) {
g_warning ("Error while spanning child!");
goto bail_fork;
}
close(pid_pipe[0]);
} else {
/* No intermediate child, simple */
*child = pid;
}
/* Wait for the child to be ready, set the window size, then
* signal that we're ready. We need to synchronize here to
* avoid possible races when the child has to do more setup
* of the terminal than just opening it. */
n_read(ready_a[0], &c, 1);
_pty_set_size(parent_fd, columns, rows);
n_write(ready_b[1], &c, 1);
close(ready_a[0]);
close(ready_b[1]);
*stdin_fd = stdin_pipe[1];
*stdout_fd = stdout_pipe[0];
*stderr_fd = stderr_pipe[0];
return 0;
break;
}
g_assert_not_reached();
return -1;
bail_fork:
close(*slave_fd);
bail_slavefd:
close(stderr_pipe[0]);
close(stderr_pipe[1]);
bail_stderr:
close(stdout_pipe[0]);
close(stdout_pipe[1]);
bail_stdout:
close(stdin_pipe[0]);
close(stdin_pipe[1]);
bail_stdin:
if(reapchild) {
close(pid_pipe[0]);
close(pid_pipe[1]);
}
bail_pid:
close(ready_a[0]);
close(ready_a[1]);
close(ready_b[0]);
close(ready_b[1]);
bail_ready:
*child = -1;
return -1;
}
/**
* pty_set_size:
* @master: the file descriptor of the pty master
* @columns: the desired number of columns
* @rows: the desired number of rows
*
* Attempts to resize the pseudo terminal's window size. If successful, the
* OS kernel will send #SIGWINCH to the child process group.
*
* Returns: 0 on success, -1 on failure.
*/
static int
_pty_set_size(int master, int columns, int rows)
{
struct winsize size;
int ret;
memset(&size, 0, sizeof(size));
size.ws_row = rows ? rows : 24;
size.ws_col = columns ? columns : 80;
ret = ioctl(master, TIOCSWINSZ, &size);
return ret;
}
static char *
_pty_ptsname(int master)
{
#if defined(HAVE_PTSNAME_R)
gsize len = 1024;
char *buf = NULL;
int i;
do {
buf = g_malloc0(len);
i = ptsname_r(master, buf, len - 1);
switch (i) {
case 0:
/* Return the allocated buffer with the name in it. */
return buf;
break;
default:
g_free(buf);
buf = NULL;
break;
}
len *= 2;
} while ((i != 0) && (errno == ERANGE));
#elif defined(HAVE_PTSNAME)
char *p;
if ((p = ptsname(master)) != NULL) {
return g_strdup(p);
}
#elif defined(TIOCGPTN)
int pty = 0;
if (ioctl(master, TIOCGPTN, &pty) == 0) {
return g_strdup_printf("/dev/pts/%d", pty);
}
#endif
return NULL;
}
static int
_pty_getpt(void)
{
int fd, flags;
#ifdef HAVE_GETPT
/* Call the system's function for allocating a pty. */
fd = getpt();
#elif defined(HAVE_POSIX_OPENPT)
fd = posix_openpt(O_RDWR | O_NOCTTY);
#else
/* Try to allocate a pty by accessing the pty master multiplex. */
fd = open("/dev/ptmx", O_RDWR | O_NOCTTY);
if ((fd == -1) && (errno == ENOENT)) {
fd = open("/dev/ptc", O_RDWR | O_NOCTTY); /* AIX */
}
#endif
/* Set it to blocking. */
flags = fcntl(fd, F_GETFL);
flags &= ~(O_NONBLOCK);
fcntl(fd, F_SETFL, flags);
return fd;
}
static int
_pty_grantpt(int master)
{
#ifdef HAVE_GRANTPT
return grantpt(master);
#else
return 0;
#endif
}
static int
_pty_unlockpt(int fd)
{
#ifdef HAVE_UNLOCKPT
return unlockpt(fd);
#elif defined(TIOCSPTLCK)
int zero = 0;
return ioctl(fd, TIOCSPTLCK, &zero);
#else
return -1;
#endif
}
static int
_pty_open_unix98(pid_t *child, guint flags, char **env_add,
const char *command, char **argv,
const char *directory, int columns, int rows,
int *stdin_fd, int *stdout_fd, int *stderr_fd, int *slave_fd)
{
int fd;
char *buf;
/* Attempt to open the master. */
fd = _pty_getpt();
if (fd != -1) {
/* Read the slave number and unlock it. */
if (((buf = _pty_ptsname(fd)) == NULL) ||
(_pty_grantpt(fd) != 0) ||
(_pty_unlockpt(fd) != 0)) {
close(fd);
fd = -1;
} else {
/* Start up a child process with the given command. */
if (_pty_fork_on_pty_name(buf, fd, env_add, command,
argv, directory,
columns, rows,
stdin_fd, stdout_fd, stderr_fd, slave_fd,
child,
flags & PTY_REAP_CHILD,
flags & PTY_LOGIN_TTY) != 0) {
close(fd);
fd = -1;
}
g_free(buf);
}
}
return fd;
}
#elif defined(HAVE_OPENPTY)
static int
_pty_open_bsd(pid_t *child, const char *command, char **argv,
int *stdin_fd, int *stdout_fd, int *stderr_fd, int *slave_fd)
{
int master;
char **args, *arg;
int stdin_pipe[2];
int stdout_pipe[2];
int stderr_pipe[2];
pid_t pid;
int i;
if (pipe(stdin_pipe))
goto bail_stdin;
if (pipe(stdout_pipe))
goto bail_stdout;
if (pipe(stderr_pipe))
goto bail_stderr;
if (openpty(&master, slave_fd, NULL, NULL, NULL) == -1)
return (-1);
switch(pid = fork()) {
case -1:
goto bail_fork;
case 0:
/*
* Child
*/
close(master);
close(stdin_pipe[1]);
close(stdout_pipe[0]);
close(stderr_pipe[0]);
setsid();
if (ioctl(*slave_fd, TIOCSCTTY, (char *)NULL) == -1)
_exit(0);
/* Set up stdin/out/err */
dup2(stdin_pipe[0], STDIN_FILENO);
dup2(stdout_pipe[1], STDOUT_FILENO);
dup2(stderr_pipe[1], STDERR_FILENO);
close(stdin_pipe[0]);
close(stdout_pipe[1]);
close(stderr_pipe[1]);
/* Reset our signals -- our parent may have done any number of
* weird things to them. */
_pty_reset_signal_handlers();
/* Outta here. */
if (argv != NULL) {
for (i = 0; (argv[i] != NULL); i++) ;
args = g_malloc0(sizeof(char*) * (i + 1));
for (i = 0; (argv[i] != NULL); i++) {
args[i] = g_strdup(argv[i]);
}
execvp(command, args);
} else {
arg = g_strdup(command);
execlp(command, arg, NULL);
}
/* Avoid calling any atexit() code. */
_exit(0);
g_assert_not_reached();
}
/*
* Parent
*/
close(stdin_pipe[0]);
close(stdout_pipe[1]);
close(stderr_pipe[1]);
*child = pid;
*stdin_fd = stdin_pipe[1];
*stdout_fd = stdout_pipe[0];
*stderr_fd = stderr_pipe[0];
return (master);
bail_fork:
close(stderr_pipe[0]);
close(stderr_pipe[1]);
bail_stderr:
close(stdout_pipe[0]);
close(stdout_pipe[1]);
bail_stdout:
close(stdin_pipe[0]);
close(stdin_pipe[1]);
bail_stdin:
*child = -1;
return -1;
}
#else
#error Have neither UNIX98 PTY nor BSD openpty!
#endif /* HAVE_UNIX98_PTY */
/**
* pty_open:
* @child: location to store the new process's ID
* @env_add: a list of environment variables to add to the child's environment
* @command: name of the binary to run
* @argv: arguments to pass to @command
* @directory: directory to start the new command in, or NULL
* @columns: desired window columns
* @rows: desired window rows
* @lastlog: TRUE if the lastlog should be updated
* @utmp: TRUE if the utmp or utmpx log should be updated
* @wtmp: TRUE if the wtmp or wtmpx log should be updated
*
* Starts a new copy of @command running under a psuedo-terminal, optionally in
* the supplied @directory, with window size set to @rows x @columns
* and variables in @env_add added to its environment. If any combination of
* @lastlog, @utmp, and @wtmp is set, then the session is logged in the
* corresponding system files.
*
* Returns: an open file descriptor for the pty master, -1 on failure
*/
int
pty_open(pid_t *child, guint flags, char **env_add,
const char *command, char **argv, const char *directory,
int columns, int rows,
int *stdin_fd, int *stdout_fd, int *stderr_fd, int *slave_fd)
{
int ret = -1;
#if defined(HAVE_UNIX98_PTY)
ret = _pty_open_unix98(child, flags, env_add, command, argv, directory,
columns, rows, stdin_fd, stdout_fd, stderr_fd,
slave_fd);
#elif defined(HAVE_OPENPTY)
ret = _pty_open_bsd(child, command, argv,
stdin_fd, stdout_fd, stderr_fd, slave_fd);
#else
#error Have neither UNIX98 PTY nor BSD openpty!
#endif
return ret;
}
#ifdef PTY_MAIN
int fd;
static void
sigchld_handler(int signum)
{
}
int
main(int argc, char **argv)
{
pid_t child = 0;
char c;
int ret;
signal(SIGCHLD, sigchld_handler);
fd = pty_open(&child, 0, NULL,
(argc > 1) ? argv[1] : NULL,
(argc > 1) ? argv + 1 : NULL,
NULL,
0, 0,
NULL, NULL, NULL);
if (child == 0) {
int i;
for (i = 0; ; i++) {
switch (i % 3) {
case 0:
case 1:
fprintf(stdout, "%d\n", i);
break;
case 2:
fprintf(stderr, "%d\n", i);
break;
default:
g_assert_not_reached();
break;
}
sleep(1);
}
}
g_print("Child pid is %d.\n", (int)child);
do {
ret = n_read(fd, &c, 1);
if (ret == 0) {
break;
}
if ((ret == -1) && (errno != EAGAIN) && (errno != EINTR)) {
break;
}
if (argc < 2) {
n_write(STDOUT_FILENO, "[", 1);
}
n_write(STDOUT_FILENO, &c, 1);
if (argc < 2) {
n_write(STDOUT_FILENO, "]", 1);
}
} while (TRUE);
return 0;
}
#endif
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