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/*
* Copyright (C) 2001,2002 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.
*/
#ident "$Id$"
#include "../config.h"
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <glib.h>
#include "debug.h"
#include "pty.h"
/* 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
vte_pty_fork_on_fd(const char *path, const char **env_add,
const char *command, const char **argv, pid_t *child)
{
int fd, i;
pid_t pid;
char **args, *arg;
/* Start up a child. */
pid = fork();
if (pid == -1) {
/* Error fork()ing. Bail. */
*child = -1;
return -1;
}
if (pid != 0) {
/* Parent. Close our connection to the slave and return the
* new child's PID. */
*child = pid;
return 0;
}
/* Set any environment variables. */
for (i = 0; (env_add != NULL) && (env_add[i] != NULL); i++) {
if (putenv(g_strdup(env_add[i])) == -1) {
g_warning("Error adding `%s' to environment, "
"continuing.", env_add[i]);
}
#ifdef VTE_DEBUG
if (vte_debug_on(VTE_DEBUG_MISC)) {
fprintf(stderr, "Set `%s'.\n", env_add[i]);
}
#endif
}
/* Child. Start a new session and become process-group leader. */
setsid();
setpgid(0, 0);
/* Close all descriptors. */
for (i = 0; i < sysconf(_SC_OPEN_MAX); i++) {
close(i);
}
/* 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;
}
if (fd != STDIN_FILENO) {
dup2(fd, STDIN_FILENO);
}
if (fd != STDOUT_FILENO) {
dup2(fd, STDOUT_FILENO);
}
if (fd != STDERR_FILENO) {
dup2(fd, STDERR_FILENO);
}
/* Close the original slave descriptor, unless it's one of the stdio
* descriptors. */
if ((fd != STDIN_FILENO) &&
(fd != STDOUT_FILENO) &&
(fd != STDERR_FILENO)) {
close(fd);
}
/* 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);
}
static char *
vte_pty_ptsname(int master)
{
#if defined(HAVE_PTSNAME_R)
char buf[PATH_MAX];
memset(buf, 0, sizeof(buf));
if (ptsname_r(master, buf, sizeof(buf) - 1) == 0) {
return g_strdup(buf);
}
#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
vte_pty_getpt(void)
{
#ifdef HAVE_GETPT
return getpt();
#else
return open("/dev/ptmx", O_RDWR | O_NOCTTY);
#endif
}
static int
vte_pty_grantpt(int master)
{
#ifdef HAVE_GRANTPT
return grantpt(master);
#else
return 0;
#endif
}
static int
vte_pty_unlockpt(int fd)
{
#ifdef HAVE_UNLOCKPT
return unlockpt(fd);
#elif defined(TIOCSPTLCK)
int zero = 0;
return ioctl(fd, TIOCSPTLCK, &zero);
#endif
return -1;
}
static int
vte_pty_open_unix98(pid_t *child, const char **env_add,
const char *command, const char **argv)
{
int fd;
char *buf;
/* Attempt to open the master. */
fd = vte_pty_getpt();
if (fd != -1) {
/* Read the slave number and unlock it. */
if (((buf = vte_pty_ptsname(fd)) == NULL) ||
(vte_pty_grantpt(fd) != 0) ||
(vte_pty_unlockpt(fd) != 0)) {
close(fd);
fd = -1;
} else {
/* Start up a child process with the given command. */
if (vte_pty_fork_on_fd(buf, env_add, command, argv,
child) != 0) {
close(fd);
fd = -1;
}
g_free(buf);
}
}
return fd;
}
static int
vte_pty_open_old_school(pid_t *child, const char **env_add,
const char *command, const char **argv)
{
/* FIXME */
return -1;
}
int
vte_pty_open(pid_t *child, const char **env_add,
const char *command, const char **argv)
{
int ret = -1;
if (ret == -1) {
ret = vte_pty_open_unix98(child, env_add, command, argv);
}
if (ret == -1) {
ret = vte_pty_open_old_school(child, env_add, command, argv);
}
return ret;
}
#ifdef PTY_MAIN
int
main(int argc, char **argv)
{
pid_t child;
int fd;
char c;
fd = vte_pty_open(&child, "/usr/bin/tty");
g_print("Child pid is %d.\n", (int)child);
while(read(fd, &c, 1) == 1) {
write(STDOUT_FILENO, &c, 1);
}
return 0;
}
#endif
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