1 files changed, 79 insertions, 0 deletions
diff --git a/sys-utils/pivot_root.c b/sys-utils/pivot_root.c
new file mode 100644
index 0000000..aef1b12
--- /dev/null
+++ b/sys-utils/pivot_root.c
@@ -0,0 +1,79 @@
+/*
+ * pivot_root.c - Change the root file system
+ *
+ * Copyright (C) 2000 Werner Almesberger
+ *
+ * This file 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 of the License, or
+ * (at your option) any later version.
+ *
+ * This file 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 <err.h>
+#include <errno.h>
+#include <getopt.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+#include "c.h"
+#include "nls.h"
+#include "closestream.h"
+
+#define pivot_root(new_root,put_old) syscall(SYS_pivot_root,new_root,put_old)
+
+static void __attribute__((__noreturn__)) usage(void)
+{
+	FILE *out = stdout;
+	fputs(USAGE_HEADER, out);
+	fprintf(out, _(" %s [options] new_root put_old\n"),
+		program_invocation_short_name);
+
+	fputs(USAGE_SEPARATOR, out);
+	fputs(_("Change the root filesystem.\n"), out);
+
+	fputs(USAGE_OPTIONS, out);
+	printf(USAGE_HELP_OPTIONS(16));
+	printf(USAGE_MAN_TAIL("pivot_root(8)"));
+	exit(EXIT_SUCCESS);
+}
+
+int main(int argc, char **argv)
+{
+	int ch;
+	static const struct option longopts[] = {
+		{"version", no_argument, NULL, 'V'},
+		{"help", no_argument, NULL, 'h'},
+		{NULL, 0, NULL, 0}
+	};
+
+	setlocale(LC_ALL, "");
+	bindtextdomain(PACKAGE, LOCALEDIR);
+	textdomain(PACKAGE);
+	close_stdout_atexit();
+
+	while ((ch = getopt_long(argc, argv, "Vh", longopts, NULL)) != -1)
+		switch (ch) {
+		case 'V':
+			print_version(EXIT_SUCCESS);
+		case 'h':
+			usage();
+		default:
+			errtryhelp(EXIT_FAILURE);
+		}
+
+	if (argc != 3) {
+		warnx(_("bad usage"));
+		errtryhelp(EXIT_FAILURE);
+	}
+	if (pivot_root(argv[1], argv[2]) < 0)
+		err(EXIT_FAILURE, _("failed to change root from `%s' to `%s'"),
+		    argv[1], argv[2]);
+
+	return EXIT_SUCCESS;
+}