src/runlevel.c

/*
 * runlevel	Prints out the previous and the current runlevel.
 *
 * Version:	@(#)runlevel  1.20  16-Apr-1997  MvS
 *
 *		This file is part of the sysvinit suite,
 *		Copyright (C) 1991-1997 Miquel van Smoorenburg.
 *
 *		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 of the License, 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.
 *
 *		You should have received a copy of the GNU General Public License
 *		along with this program; if not, write to the Free Software
 *		Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <stdio.h>
#include <utmpx.h>
#include <time.h>
#include <stdlib.h>
#include <sys/param.h>

#if defined __INTERIX || defined __FreeBSD__
#ifndef RUN_LVL
#ifdef EMPTY
#define RUN_LVL EMPTY
#else
#define RUN_LVL 0
#endif
#endif		/* !RUN_LVL */
#endif

int main(argc, argv)
int argc;
char **argv;
{
  struct utmpx *ut;
  char prev;

#if !defined __INTERIX && !defined __FreeBSD__
  if (argc > 1) utmpxname(argv[1]);
#endif
  setutxent();
  while ((ut = getutxent()) != NULL) {
	if (ut->ut_type == RUN_LVL) {
		if(ut->ut_pid) {
			prev = ut->ut_pid / 256;
			if (prev == 0) prev = 'N';
			printf("%c %c\n", prev, (int)(ut->ut_pid % 256));
		} else {
			puts(ut->ut_line);
		}
		endutxent();
		return 0;
	}
  }
  puts("unknown");
  endutxent();
  return 1;
}