/*
- * pivot_root.c - Change the root file system
- *
- * Copyright (C) 2000 Werner Almesberger
+ * SPDX-License-Identifier: GPL-2.0-or-later
*
* 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.
+ * Copyright (C) 2000 Werner Almesberger
*/
#include <err.h>
#include <errno.h>
#define pivot_root(new_root,put_old) syscall(SYS_pivot_root,new_root,put_old)
-static void __attribute__ ((__noreturn__)) usage(FILE * out)
+static void __attribute__((__noreturn__)) usage(void)
{
- fprintf(out, USAGE_HEADER);
+ 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);
- fprintf(out, USAGE_OPTIONS);
- fprintf(out, USAGE_HELP);
- fprintf(out, USAGE_VERSION);
+ fputs(USAGE_OPTIONS, out);
+ fprintf(out, USAGE_HELP_OPTIONS(16));
fprintf(out, USAGE_MAN_TAIL("pivot_root(8)"));
- exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
+ exit(EXIT_SUCCESS);
}
int main(int argc, char **argv)
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
- atexit(close_stdout);
+ close_stdout_atexit();
while ((ch = getopt_long(argc, argv, "Vh", longopts, NULL)) != -1)
switch (ch) {
case 'V':
- printf(UTIL_LINUX_VERSION);
- return EXIT_SUCCESS;
+ print_version(EXIT_SUCCESS);
case 'h':
- usage(stdout);
+ usage();
default:
errtryhelp(EXIT_FAILURE);
}
- if (argc != 3)
- usage(stderr);
-
+ 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]);