/*
* NVRAM WakeUp
* Copyright (C) 2001-2003, Sergei Haller.
*
* $Id: rtc.c 381 2003-03-18 13:44:07Z bistr-o-math $
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
* This file is taken (with small modifications) from:
*
* Real Time Clock Driver Test/Example Program
*
* Compile with:
* gcc -s -Wall -Wstrict-prototypes rtc.c -o rtc
*
* Copyright (C) 1996, Paul Gortmaker.
*
* Released under the GNU General Public License, version 2,
* included herein by reference.
*
*/
#define CVSREV_rtc_c "$Id: rtc.c 381 2003-03-18 13:44:07Z bistr-o-math $"
#include <stdio.h>
#include <linux/rtc.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
int main(void) {
int fd, retval;
struct rtc_time rtc_tm;
fd = open ("/dev/rtc", O_RDONLY);
if (fd == -1) {
perror("/dev/rtc");
exit(errno);
}
/* Read the current alarm settings */
retval = ioctl(fd, RTC_ALM_READ, &rtc_tm);
if (retval == -1) {
perror("ioctl");
exit(errno);
}
fprintf(stderr, "Alarm time now set to %02d:%02d:%02d.\n",
rtc_tm.tm_hour, rtc_tm.tm_min, rtc_tm.tm_sec);
close(fd);
return 0;
} /* end main */