From f431cd1a48a6a5186633bf5f16a2d21cb4399e8c Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pjm@nac.net>
Date: Thu, 09 Feb 2012 10:56:43 -0500
Subject: Initial commit.

TODO: Copyright information.
Including source code and a patch to add files generated by GNU Autoconf
is not very pretty...  Running 'make dist' in the SVN trunk to generate
a source archive might be better.
---
(limited to 'src/libopkg/xsystem.c')

diff --git a/src/libopkg/xsystem.c b/src/libopkg/xsystem.c
new file mode 100644
index 0000000..ae7ca87
--- /dev/null
+++ b/src/libopkg/xsystem.c
@@ -0,0 +1,73 @@
+/* xsystem.c - system(3) with error messages
+
+   Carl D. Worth
+
+   Copyright (C) 2001 University of Southern California
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   This program 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
+   General Public License for more details.
+*/
+
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include "xsystem.h"
+#include "libbb/libbb.h"
+
+/* Like system(3), but with error messages printed if the fork fails
+   or if the child process dies due to an uncaught signal. Also, the
+   return value is a bit simpler:
+
+   -1 if there was any problem
+   Otherwise, the 8-bit return value of the program ala WEXITSTATUS
+   as defined in <sys/wait.h>.
+*/
+int
+xsystem(const char *argv[])
+{
+	int status;
+	pid_t pid;
+
+	pid = vfork();
+
+	switch (pid) {
+	case -1:
+		opkg_perror(ERROR, "%s: vfork", argv[0]);
+		return -1;
+	case 0:
+		/* child */
+		execvp(argv[0], (char*const*)argv);
+		_exit(-1);
+	default:
+		/* parent */
+		break;
+	}
+
+	if (waitpid(pid, &status, 0) == -1) {
+		opkg_perror(ERROR, "%s: waitpid", argv[0]);
+		return -1;
+	}
+
+	if (WIFSIGNALED(status)) {
+		opkg_msg(ERROR, "%s: Child killed by signal %d.\n",
+			argv[0], WTERMSIG(status));
+		return -1;
+	}
+
+	if (!WIFEXITED(status)) {
+		/* shouldn't happen */
+		opkg_msg(ERROR, "%s: Your system is broken: got status %d "
+			"from waitpid.\n", argv[0], status);
+		return -1;
+	}
+
+	return WEXITSTATUS(status);
+}
--
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