Libc-1272.200.26.tar.gz

[apple/libc.git] / stdlib / FreeBSD / system.c

diff --git a/stdlib/FreeBSD/system.c b/stdlib/FreeBSD/system.c
index 8cdc1ddc18b5c3fa6bf86c74da9559dafdcab0eb..8ab1ecac15de70315b66eccb1f1ceec9edd6f3b9 100644 (file)
--- a/stdlib/FreeBSD/system.c
+++ b/stdlib/FreeBSD/system.c
@@ -27,6 +27,9 @@
  * SUCH DAMAGE.
  */
 
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wstrict-prototypes"
+
 #if defined(LIBC_SCCS) && !defined(lint)
 static char sccsid[] = "@(#)system.c   8.1 (Berkeley) 6/4/93";
 #endif /* LIBC_SCCS and not lint */
@@ -40,23 +43,70 @@ __FBSDID("$FreeBSD: src/lib/libc/stdlib/system.c,v 1.11 2007/01/09 00:28:10 imp
 #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())
+
+#include <TargetConditionals.h>
+
+#if __DARWIN_UNIX03
+#include <pthread.h>
+
+#if !(TARGET_OS_IPHONE && (TARGET_OS_SIMULATOR || !TARGET_OS_IOS))
+static pthread_mutex_t __systemfn_mutex = PTHREAD_MUTEX_INITIALIZER;
+#endif
+extern int __unix_conforming;
+#endif /* __DARWIN_UNIX03 */
+
 int
 __system(command)
        const char *command;
 {
+#if TARGET_OS_IPHONE && (TARGET_OS_SIMULATOR || !TARGET_OS_IOS)
+       // Don't abort() on iOS for now
+       LIBC_ABORT("system() is not supported on this platform.");
+#else
        pid_t pid, savedpid;
-       int pstat;
+       int pstat, err;
        struct sigaction ign, intact, quitact;
-       sigset_t newsigblock, oldsigblock;
+       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();
+#endif /* VARIANT_CANCELABLE */
+#endif /* __DARWIN_UNIX03 */
 
-       if (!command)           /* just checking... */
-               return(1);
+       if (!command) {         /* just checking... */
+#if TARGET_OS_IPHONE
+               return(0);
+#else
+               if (access(_PATH_BSHELL, F_OK) == -1)   /* if no sh or no access */
+                       return(0);
+               else
+                       return(1);
+#endif
+       }
 
+       if ((err = posix_spawnattr_init(&attr)) != 0) {
+               errno = err;
+               return -1;
+       }
+       (void)sigemptyset(&defaultsig);
+
+#if __DARWIN_UNIX03
+       pthread_mutex_lock(&__systemfn_mutex);
+#endif /* __DARWIN_UNIX03 */
        /*
         * Ignore SIGINT and SIGQUIT, block SIGCHLD. Remember to save
         * existing signal dispositions.
@@ -65,34 +115,49 @@ __system(command)
        (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);
-       switch(pid = fork()) {
-       case -1:                        /* error */
-               break;
-       case 0:                         /* child */
-               /*
-                * Restore original signal dispositions and exec the command.
-                */
-               (void)_sigaction(SIGINT, &intact, NULL);
-               (void)_sigaction(SIGQUIT,  &quitact, NULL);
-               (void)_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
-               execl(_PATH_BSHELL, "sh", "-c", command, (char *)NULL);
-               _exit(127);
-       default:                        /* parent */
+       (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);
-               break;
+               if (pid == -1) pstat = -1;
+       } else if (err == ENOMEM || err == EAGAIN) { /* as if fork failed */
+               pstat = -1;
+       } else {
+               pstat = W_EXITCODE(127, 0); /* couldn't exec shell */
        }
+
        (void)_sigaction(SIGINT, &intact, NULL);
        (void)_sigaction(SIGQUIT,  &quitact, NULL);
        (void)_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
-       return(pid == -1 ? -1 : pstat);
+#if __DARWIN_UNIX03
+       pthread_mutex_unlock(&__systemfn_mutex);
+#endif /* __DARWIN_UNIX03 */
+       return(pstat);
+#endif /* TARGET_OS_IPHONE && (TARGET_OS_SIMULATOR || !TARGET_OS_IOS) */
 }
 
 __weak_reference(__system, system);
 __weak_reference(__system, _system);
+
+#pragma clang diagnostic pop