Improve ast_safe_system

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@2541 65c4cc65-6c06-0410-ace0-fbb531ad65f3

asterisk.c

@@ -168,8 +168,8 @@ int ast_safe_system(const char *s)
 		for (x=STDERR_FILENO + 1; x<4096;x++) {
 			close(x);
 		}
-		res = system(s);
-		exit(res);
+		res = execl("/bin/sh", "/bin/sh", "-c", s, NULL);
+		exit(1);
 	} else if (pid > 0) {
 		for(;;) {
 			res = wait4(pid, &status, 0, &rusage);