busybox/miscutils/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 1991-1997 Miquel van Smoorenburg.
 *
 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
 *
 * initially busyboxified by Bernhard Fischer
 */

#include <stdio.h>
#include <utmp.h>
#include <time.h>
#include <stdlib.h>

#include "busybox.h"

int runlevel_main(int argc, char *argv[])
{
  struct utmp *ut;
  char prev;

  if (argc > 1) utmpname(argv[1]);

  setutent();
  while ((ut = getutent()) != NULL) {
	if (ut->ut_type == RUN_LVL) {
		prev = ut->ut_pid / 256;
		if (prev == 0) prev = 'N';
		printf("%c %c\n", prev, ut->ut_pid % 256);
		endutent();
		return (0);
	}
  }

  printf("unknown\n");
  endutent();
  return (1);
}