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/* opiealarm.c
* This program is for extracting the event time/date out
* of /etc/resumeat and setting the RTC alarm to that time/date.
* It is designed to run via a script just before the iPaq
* is suspended.
*
* Roughly based on ipaqalarm from Benjamin Long
*
* written by Robert Griebl <sandman@handhelds.org>
*/
#include <stdio.h>
#include <linux/rtc.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <time.h>
#include <stdlib.h>
void error_msg_and_die ( int perr, const char *msg )
{
if ( perr )
perror ( msg );
else
fprintf ( stderr, "%s\n", msg );
exit ( 1 );
}
void extractevent ( )
{
FILE *fp;
char buf [64];
time_t t;
struct tm *tm;
int fd;
if (!( fp = fopen ( "/etc/resumeat", "r" )))
error_msg_and_die ( 1, "/etc/resumeat" );
if ( !fgets ( buf, sizeof( buf ) - 1, fp ))
error_msg_and_die ( 1, "/etc/resumeat" );
fclose ( fp );
t = atoi ( buf );
if ( t == 0 )
error_msg_and_die ( 0, "/etc/resumeat contains an invalid time description" );
/* subtract 5 sec from event time... */
t -= 5;
tm = gmtime ( &t );
/* Write alarm time to RTC */
fd = open ( "/dev/misc/rtc", O_RDWR );
if ( fd < 0 )
error_msg_and_die ( 1, "/dev/misc/rtc" );
// set alarm time
if ( ioctl ( fd, RTC_ALM_SET, tm ) < 0 )
error_msg_and_die ( 1, "ioctl RTC_ALM_SET" );
// enable alarm irq
if ( ioctl ( fd, RTC_AIE_ON, 0 ) < 0 )
error_msg_and_die ( 1, "ioctl RTC_AIE_ON" );
// wait for alarm irq
if ( read ( fd, buf, sizeof( unsigned long )) < 0 )
error_msg_and_die ( 1, "read rtc alarm" );
// disable alarm irq
if ( ioctl ( fd, RTC_AIE_OFF, 0 ) < 0 )
error_msg_and_die ( 1, "ioctl RTC_AIE_OFF" );
close ( fd );
}
int main ( )
{
if ( geteuid ( ) != 0 )
error_msg_and_die ( 0, "You need root priviledges to run opiealarm." );
extractevent ( );
return 0;
}
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