/*
* lastboot.c
*
* $Id: lastboot.c,v 1.00 2007/07/28 01:30:00 prog Exp $
*
* Copyright (C) 2007 by 4chan's /prog/ <http://dis.4chan.org/prog/>;
*
* 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 3 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, see <http://www.gnu.org/licenses/>;.
*/
#include <stdio.h>
#include <time.h>
int main(void)
{
int uptime, ret;
time_t t;
FILE * f;
f = fopen("/proc/uptime","r");
if (!f)
{
perror("cannot open /proc/uptime");
return 1;
}
ret = fscanf(f, "%u", &uptime);
if (ret==EOF)
{
perror("cannot read /proc/uptime");
return 2;
}
if (ret!=1)
{
puts("/proc/uptime has bad format");
}
fclose(f);
t = time(0)-uptime;
printf("System last booted: %s\n", ctime(&t));
return 0;
}