procps/uptime.c

/*
 * uptime.c - display system uptime
 * Copyright (C) 2012 Craig Small <csmall-procps@enc.com.au>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <errno.h>
#include <getopt.h>
#include <stdlib.h>
#include <stdio.h>

#include "c.h"
#include "nls.h"
#include "proc/whattime.h"
#include "proc/version.h"

static void __attribute__ ((__noreturn__)) usage(FILE * out)
{
	fputs(USAGE_HEADER, out);
	fprintf(out, _(" %s [options]\n"), program_invocation_short_name);
	fputs(USAGE_OPTIONS, out);
	fputs(USAGE_HELP, out);
	fputs(USAGE_VERSION, out);
	fprintf(out, USAGE_MAN_TAIL("uptime(1)"));

	exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
}

int main(int argc, char **argv)
{
	int c;

	static const struct option longopts[] = {
		{"help", no_argument, NULL, 'h'},
		{"version", no_argument, NULL, 'V'},
		{NULL, 0, NULL, 0}
	};

	program_invocation_name = program_invocation_short_name;
	setlocale (LC_ALL, "");
	bindtextdomain(PACKAGE, LOCALEDIR);
	textdomain(PACKAGE);

	while ((c = getopt_long(argc, argv, "hV", longopts, NULL)) != -1)
		switch (c) {
		case 'h':
			usage(stdout);
		case 'V':
			printf(PROCPS_NG_VERSION);
			return EXIT_SUCCESS;
		default:
			usage(stderr);
		}

	print_uptime();
	return EXIT_SUCCESS;
}