From: roland <roland>
Date: Wed, 26 Jun 1991 16:28:00 +0000 (+0000)
Subject: Initial revision
X-Git-Tag: jems-14oct94~6342
X-Git-Url: http://git.csclub.uwaterloo.ca/?p=kopensolaris-gnu%2Fglibc.git;a=commitdiff_plain;h=60790fbc25b6d91866fa0a72973007a23efeabbc

Initial revision
---

diff --git a/sysdeps/posix/system.c b/sysdeps/posix/system.c
new file mode 100644
index 0000000000..593a4b3b90
--- /dev/null
+++ b/sysdeps/posix/system.c
@@ -0,0 +1,114 @@
+/* Copyright (C) 1991 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <ansidecl.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/wait.h>
+#include <signal.h>
+#include <sys/types.h>
+
+
+#define	SHELL_PATH	"/bin/sh"	/* Path of the shell.  */
+#define	SHELL_NAME	"sh"		/* Name to give it.  */
+
+#ifndef	FORK
+#define	FORK	__fork
+#endif
+
+/* Execute LINE as a shell command, returning its status.  */
+int
+DEFUN(system, (line), register CONST char *line)
+{
+  int status;
+  pid_t pid;
+  struct sigaction sa, intr, quit;
+  sigset_t block, omask;
+
+  if (line == NULL)
+    return 1;
+
+  sa.sa_handler = SIG_IGN;
+  sa.sa_flags = 0;
+  if (__sigemptyset(&sa.sa_mask) < 0)
+    return -1;
+  if (__sigaction(SIGINT, &sa, &intr) < 0)
+    return -1;
+  if (__sigaction(SIGQUIT, &sa, &quit) < 0)
+    {
+      (void) __sigaction(SIGINT, &intr, (struct sigaction *) NULL);
+      return -1;
+    }
+  if (__sigemptyset(&block) < 0 || __sigaddset(&block, SIGCHLD) < 0 ||
+      __sigprocmask(SIG_BLOCK, &block, &omask) < 0)
+    {
+      (void) __sigaction(SIGINT, &intr, (struct sigaction *) NULL);
+      (void) __sigaction(SIGQUIT, &quit, (struct sigaction *) NULL);
+      return -1;
+    }
+
+  pid = FORK();
+  if (pid == (pid_t) 0)
+    {
+      /* Child side.  */
+      CONST char *new_argv[4];
+      new_argv[0] = SHELL_NAME;
+      new_argv[1] = "-c";
+      new_argv[2] = line;
+      new_argv[3] = NULL;
+
+      /* Restore the signals.  */
+      (void) __sigaction(SIGINT, &intr, (struct sigaction *) NULL);
+      (void) __sigaction(SIGQUIT, &quit, (struct sigaction *) NULL);
+      (void) __sigprocmask(SIG_SETMASK, &omask, (sigset_t *) NULL);
+
+      /* Exec the shell.  */
+      (void) __execve(SHELL_PATH, (char *CONST *) new_argv, __environ);
+      _exit(127);
+    }
+  else if (pid < (pid_t) 0)
+    /* The fork failed.  */
+    status = -1;
+  else
+    /* Parent side.  */
+#ifdef	NO_WAITPID
+    {
+      pid_t child;
+      do
+	{
+	  child = __wait (&status);
+	  if (child <= -1)
+	    {
+	      status = -1;
+	      break;
+	    }
+	} while (child != pid);
+    }
+#else
+    if (__waitpid(pid, &status, 0) != pid)
+      status = -1;
+#endif
+
+  if ((__sigaction(SIGINT, &intr, (struct sigaction *) NULL) |
+       __sigaction(SIGQUIT, &quit, (struct sigaction *) NULL) |
+       __sigprocmask(SIG_SETMASK, &omask, (sigset_t *) NULL)) != 0)
+    return -1;
+
+  return status;
+}