1 files changed, 76 insertions, 0 deletions

diff --git a/lib/libc/stdlib/system.c b/lib/libc/stdlib/system.c
new file mode 100644
index 000000000000..c438f1710a78
--- /dev/null
+++ b/lib/libc/stdlib/system.c
@@ -0,0 +1,76 @@
+/*
+ * 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/types.h>
+#include <sys/wait.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <paths.h>
+
+system(command)
+	const char *command;
+{
+	union wait pstat;
+	pid_t pid;
+	int omask;
+	sig_t intsave, quitsave;
+
+	if (!command)		/* just checking... */
+		return(1);
+
+	omask = sigblock(sigmask(SIGCHLD));
+	switch(pid = 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);
+	pid = waitpid(pid, (int *)&pstat, 0);
+	(void)sigsetmask(omask);
+	(void)signal(SIGINT, intsave);
+	(void)signal(SIGQUIT, quitsave);
+	return(pid == -1 ? -1 : pstat.w_status);
+}