Libc-498.tar.gz

[apple/libc.git] / stdlib / system-fbsd.c

diff --git a/stdlib/system-fbsd.c b/stdlib/system-fbsd.c
new file mode 100644 (file)
index 0000000..5173959
--- /dev/null
+++ b/stdlib/system-fbsd.c
@@ -0,0 +1,133 @@
+/*
+ * Copyright (c) 1988, 1993
+ *     The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the University of
+ *     California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)system.c   8.1 (Berkeley) 6/4/93";
+#endif /* LIBC_SCCS and not lint */
+#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 <paths.h>
+#include <errno.h>
+#include "un-namespace.h"
+#include "libc_private.h"
+
+#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 /* VARIANT_CANCELABLE */
+#endif /* __DARWIN_UNIX03 */
+
+int
+__system(command)
+       const char *command;
+{
+       pid_t pid, savedpid;
+       int pstat;
+       struct sigaction ign, intact, quitact;
+       sigset_t newsigblock, oldsigblock;
+
+#if __DARWIN_UNIX03
+       if (__unix_conforming == 0)
+               __unix_conforming = 1;
+#ifdef VARIANT_CANCELABLE
+       _pthread_testcancel(pthread_self(), 1);
+#endif /* VARIANT_CANCELABLE */
+#endif /* __DARWIN_UNIX03 */
+
+       if (!command) {         /* just checking... */
+               if (access(_PATH_BSHELL, F_OK) == -1)   /* if no sh or no access */
+                       return(0);
+               else
+                       return(1);
+       }
+
+#if __DARWIN_UNIX03
+       pthread_mutex_lock(&__systemfn_mutex);
+#endif /* __DARWIN_UNIX03 */
+       /*
+        * Ignore SIGINT and SIGQUIT, block SIGCHLD. Remember to save
+        * existing signal dispositions.
+        */
+       ign.sa_handler = SIG_IGN;
+       (void)sigemptyset(&ign.sa_mask);
+       ign.sa_flags = 0;
+       (void)_sigaction(SIGINT, &ign, &intact);
+       (void)_sigaction(SIGQUIT, &ign, &quitact);
+       (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);
+#if __DARWIN_UNIX03
+               pthread_mutex_unlock(&__systemfn_mutex);
+#endif /* __DARWIN_UNIX03 */
+               execl(_PATH_BSHELL, "sh", "-c", command, (char *)NULL);
+               _exit(127);
+       default:                        /* parent */
+               savedpid = pid;
+               do {
+                       pid = _wait4(savedpid, &pstat, 0, (struct rusage *)0);
+               } while (pid == -1 && errno == EINTR);
+               break;
+       }
+       (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 /* __DARWIN_UNIX03 */
+       return(pid == -1 ? -1 : pstat);
+}
+
+__weak_reference(__system, system);
+__weak_reference(__system, _system);