#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)system.c 8.1 (Berkeley) 6/4/93";
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/stdlib/system.c,v 1.10 2002/03/22 21:53:10 obrien Exp $");
#include "namespace.h"
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <stdlib.h>
#include <stddef.h>
#include <unistd.h>
#include <spawn.h>
#include <paths.h>
#include <errno.h>
#include "un-namespace.h"
#include "libc_private.h"
#include <crt_externs.h>
#define environ (*_NSGetEnviron())
#if __DARWIN_UNIX03
#include <pthread.h>
static pthread_mutex_t __systemfn_mutex = PTHREAD_MUTEX_INITIALIZER;
extern int __unix_conforming;
#ifdef VARIANT_CANCELABLE
extern void _pthread_testcancel(pthread_t thread, int isconforming);
#endif
#endif
int
__system(command)
const char *command;
{
pid_t pid, savedpid;
int pstat, err;
struct sigaction ign, intact, quitact;
sigset_t newsigblock, oldsigblock, defaultsig;
posix_spawnattr_t attr;
short flags = POSIX_SPAWN_SETSIGMASK;
const char *argv[] = {"sh", "-c", command, NULL};
#if __DARWIN_UNIX03
if (__unix_conforming == 0)
__unix_conforming = 1;
#ifdef VARIANT_CANCELABLE
_pthread_testcancel(pthread_self(), 1);
#endif
#endif
if (!command) {
if (access(_PATH_BSHELL, F_OK) == -1)
return(0);
else
return(1);
}
if ((err = posix_spawnattr_init(&attr)) != 0) {
errno = err;
return -1;
}
(void)sigemptyset(&defaultsig);
#if __DARWIN_UNIX03
pthread_mutex_lock(&__systemfn_mutex);
#endif
ign.sa_handler = SIG_IGN;
(void)sigemptyset(&ign.sa_mask);
ign.sa_flags = 0;
(void)_sigaction(SIGINT, &ign, &intact);
if (intact.sa_handler != SIG_IGN) {
sigaddset(&defaultsig, SIGINT);
flags |= POSIX_SPAWN_SETSIGDEF;
}
(void)_sigaction(SIGQUIT, &ign, &quitact);
if (quitact.sa_handler != SIG_IGN) {
sigaddset(&defaultsig, SIGQUIT);
flags |= POSIX_SPAWN_SETSIGDEF;
}
(void)sigemptyset(&newsigblock);
(void)sigaddset(&newsigblock, SIGCHLD);
(void)_sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock);
(void)posix_spawnattr_setsigmask(&attr, &oldsigblock);
if (flags & POSIX_SPAWN_SETSIGDEF) {
(void)posix_spawnattr_setsigdefault(&attr, &defaultsig);
}
(void)posix_spawnattr_setflags(&attr, flags);
err = posix_spawn(&pid, _PATH_BSHELL, NULL, &attr, (char *const *)argv, environ);
(void)posix_spawnattr_destroy(&attr);
if (err == 0) {
savedpid = pid;
do {
pid = _wait4(savedpid, &pstat, 0, (struct rusage *)0);
} while (pid == -1 && errno == EINTR);
if (pid == -1) pstat = -1;
} else if (err == ENOMEM || err == EAGAIN) {
pstat = -1;
} else {
pstat = W_EXITCODE(127, 0);
}
(void)_sigaction(SIGINT, &intact, NULL);
(void)_sigaction(SIGQUIT, &quitact, NULL);
(void)_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
#if __DARWIN_UNIX03
pthread_mutex_unlock(&__systemfn_mutex);
#endif
return(pstat);
}
__weak_reference(__system, system);
__weak_reference(__system, _system);