mirror of
https://github.com/autc04/Retro68.git
synced 2024-12-04 16:50:57 +00:00
159 lines
4.0 KiB
C
159 lines
4.0 KiB
C
|
/* Copyright (C) 1991-1999, 2000 Free Software Foundation, Inc.
|
||
|
This file is part of the GNU C Library.
|
||
|
|
||
|
The GNU C 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 2.1 of the License, or (at your option) any later version.
|
||
|
|
||
|
The GNU C 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 the GNU C Library; if not, write to the Free
|
||
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
||
|
02111-1307 USA. */
|
||
|
|
||
|
#include <stddef.h>
|
||
|
#include <stdlib.h>
|
||
|
#include <unistd.h>
|
||
|
#include <sys/wait.h>
|
||
|
#include <signal.h>
|
||
|
#include <sys/types.h>
|
||
|
#include <errno.h>
|
||
|
#include <machine/weakalias.h>
|
||
|
|
||
|
|
||
|
#ifndef HAVE_GNU_LD
|
||
|
#define __environ environ
|
||
|
#endif
|
||
|
|
||
|
#define SHELL_PATH "/bin/sh" /* Path of the shell. */
|
||
|
#define SHELL_NAME "sh" /* Name to give it. */
|
||
|
|
||
|
/* Execute LINE as a shell command, returning its status. */
|
||
|
int
|
||
|
__libc_system (const char *line)
|
||
|
{
|
||
|
int status, save;
|
||
|
pid_t pid;
|
||
|
struct sigaction sa, intr, quit;
|
||
|
#ifndef WAITPID_CANNOT_BLOCK_SIGCHLD
|
||
|
sigset_t block, omask;
|
||
|
#endif
|
||
|
|
||
|
if (line == NULL)
|
||
|
/* Check that we have a command processor available. It might
|
||
|
not be available after a chroot(), for example. */
|
||
|
return __libc_system ("exit 0") == 0;
|
||
|
|
||
|
sa.sa_handler = SIG_IGN;
|
||
|
sa.sa_flags = 0;
|
||
|
sigemptyset (&sa.sa_mask);
|
||
|
|
||
|
if (sigaction (SIGINT, &sa, &intr) < 0)
|
||
|
return -1;
|
||
|
if (sigaction (SIGQUIT, &sa, &quit) < 0)
|
||
|
{
|
||
|
save = errno;
|
||
|
(void) sigaction (SIGINT, &intr, (struct sigaction *) NULL);
|
||
|
errno = save;
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
#ifndef WAITPID_CANNOT_BLOCK_SIGCHLD
|
||
|
|
||
|
/* SCO 3.2v4 has a bug where `waitpid' will never return if SIGCHLD is
|
||
|
blocked. This makes it impossible for `system' to be implemented in
|
||
|
compliance with POSIX.2-1992. They have acknowledged that this is a bug
|
||
|
but I have not seen nor heard of any forthcoming fix. */
|
||
|
|
||
|
sigemptyset (&block);
|
||
|
sigaddset (&block, SIGCHLD);
|
||
|
save = errno;
|
||
|
if (sigprocmask (SIG_BLOCK, &block, &omask) < 0)
|
||
|
{
|
||
|
if (errno == ENOSYS)
|
||
|
errno = save;
|
||
|
else
|
||
|
{
|
||
|
save = errno;
|
||
|
(void) sigaction (SIGINT, &intr, (struct sigaction *) NULL);
|
||
|
(void) sigaction (SIGQUIT, &quit, (struct sigaction *) NULL);
|
||
|
errno = save;
|
||
|
return -1;
|
||
|
}
|
||
|
}
|
||
|
# define UNBLOCK sigprocmask (SIG_SETMASK, &omask, (sigset_t *) NULL)
|
||
|
#else
|
||
|
# define UNBLOCK 0
|
||
|
#endif
|
||
|
|
||
|
pid = fork ();
|
||
|
if (pid == (pid_t) 0)
|
||
|
{
|
||
|
/* Child side. */
|
||
|
const char *new_argv[4];
|
||
|
new_argv[0] = SHELL_NAME;
|
||
|
new_argv[1] = "-c";
|
||
|
new_argv[2] = line;
|
||
|
new_argv[3] = NULL;
|
||
|
|
||
|
/* Restore the signals. */
|
||
|
(void) sigaction (SIGINT, &intr, (struct sigaction *) NULL);
|
||
|
(void) sigaction (SIGQUIT, &quit, (struct sigaction *) NULL);
|
||
|
(void) UNBLOCK;
|
||
|
|
||
|
/* Exec the shell. */
|
||
|
(void) execve (SHELL_PATH, (char *const *) new_argv, __environ);
|
||
|
_exit (127);
|
||
|
}
|
||
|
else if (pid < (pid_t) 0)
|
||
|
/* The fork failed. */
|
||
|
status = -1;
|
||
|
else
|
||
|
/* Parent side. */
|
||
|
{
|
||
|
#ifdef NO_WAITPID
|
||
|
pid_t child;
|
||
|
do
|
||
|
{
|
||
|
child = wait (&status);
|
||
|
if (child <= -1 && errno != EINTR)
|
||
|
{
|
||
|
status = -1;
|
||
|
break;
|
||
|
}
|
||
|
/* Note that pid cannot be <= -1 and therefore the loop continues
|
||
|
when wait returned with EINTR. */
|
||
|
}
|
||
|
while (child != pid);
|
||
|
#else
|
||
|
int n;
|
||
|
|
||
|
do
|
||
|
n = waitpid (pid, &status, 0);
|
||
|
while (n == -1 && errno == EINTR);
|
||
|
|
||
|
if (n != pid)
|
||
|
status = -1;
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
save = errno;
|
||
|
if ((sigaction (SIGINT, &intr, (struct sigaction *) NULL) |
|
||
|
sigaction (SIGQUIT, &quit, (struct sigaction *) NULL) |
|
||
|
UNBLOCK) != 0)
|
||
|
{
|
||
|
if (errno == ENOSYS)
|
||
|
errno = save;
|
||
|
else
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
return status;
|
||
|
}
|
||
|
weak_alias (__libc_system, system)
|