Libc-262.tar.gz

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

diff --git a/stdlib/system.c b/stdlib/system.c
new file mode 100644 (file)
index 0000000..19d7c76
--- /dev/null
+++ b/stdlib/system.c
@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * The contents of this file constitute Original Code as defined in and
+ * are subject to the Apple Public Source License Version 1.1 (the
+ * "License").  You may not use this file except in compliance with the
+ * License.  Please obtain a copy of the License at
+ * http://www.apple.com/publicsource and read it before using this file.
+ * 
+ * This Original Code and all software distributed under the License are
+ * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
+ * License for the specific language governing rights and limitations
+ * under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+/*
+ * 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.
+ */
+
+
+#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>
+
+system(command)
+       const char *command;
+{
+       union wait pstat;
+       pid_t kid, pid;
+       int omask;
+       sig_t intsave, quitsave;
+
+       if (!command)           /* just checking... */
+               return(1);
+
+       omask = sigblock(sigmask(SIGCHLD));
+       switch(kid = vfork()) {
+       case -1:                        /* error */
+               (void)sigsetmask(omask);
+               pstat.w_status = 0;
+               pstat.w_retcode = 127;
+               return(pstat.w_status);
+       case 0:                         /* child */
+               (void)sigsetmask(omask);
+               execl(_PATH_BSHELL, "sh", "-c", command, (char *)NULL);
+               _exit(127);
+       }
+       intsave = signal(SIGINT, SIG_IGN);
+       quitsave = signal(SIGQUIT, SIG_IGN);
+       do {
+               pid = waitpid(kid, (int *)&pstat, 0);
+       } while (pid < 0 && errno == EINTR);
+       (void)sigsetmask(omask);
+       (void)signal(SIGINT, intsave);
+       (void)signal(SIGQUIT, quitsave);
+       return(pid == -1 ? -1 : pstat.w_status);
+}