Added a new switch (-f) to opiealarm. When enabled the RTC is 'fixed'

on suspend, if system and RTC time differ more than 5 seconds. This
works both with a installed /etc/localtime and without.
This should fix many reported problems regarding ipaqalarm/opiealarm.

2 files changed, 44 insertions, 15 deletions

diff --git a/core/opiealarm/opiealarm.c b/core/opiealarm/opiealarm.c
index ac98832..128929e 100644
--- a/core/opiealarm/opiealarm.c
+++ b/core/opiealarm/opiealarm.c
@@ -1,280 +1,309 @@
 /* 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>
 #include <syslog.h>
 #include <signal.h>
 #include <errno.h>
 #include <string.h>
 
 
 #define PIDFILE 	"/var/run/opiealarm.pid"
 #define APMFILE		"/proc/apm"
 
 FILE *log; // debug only
 
 int resume ( int resuspend );
-int suspend ( void );
+int suspend ( int fix_rtc );
 int main ( int argc, char **argv );
 int fork_with_pidfile ( void );
 int kill_with_pidfile ( void );
 void remove_pidfile ( void );
 void usage ( void );
 void sig_handler ( int sig );
 void error_msg_and_die ( int perr, const char *msg );
 int onac ( void );
 
 static int opiealarm_was_running;
 
 
 void log_msg ( const char *msg )
 {
 	if ( log ) {
 		fprintf ( log, msg );
 		fflush ( log );
 	}
 }
 
 void error_msg_and_die ( int perr, const char *msg )
 {
 	if ( perr )
 		log_msg ( strerror ( errno ));
 	log_msg ( msg );
 
 	while ( 1 )		// pretend we are waiting on RTC, so opiealarm -r can kill us
 		sleep ( 1 );
 }
 
 
 void sig_handler ( int sig )
 {
 	log_msg ( "GOT SIGNAL -> EXITING\n" );
 	fclose ( log );
 	remove_pidfile ( );
 	exit ( 0 );
 }
 
 void usage ( void )
 {
-	fprintf ( stderr, "Usage: opiealarm -r|-s [-a]\n\n" );
+	fprintf ( stderr, "Usage: opiealarm -s [-f] | -r [-a]\n\n" );
 	fprintf ( stderr, "\t-s\tSuspend mode: set RTC alarm\n" );
+	fprintf ( stderr, "\t-f    \tFix RTC, if RTC and system have more than 5sec difference (suspend mode)\n" );
 	fprintf ( stderr, "\t-r\tResume mode: kill running opiealarm\n" );
 	fprintf ( stderr, "\t-a <x>\tResuspend in <x> seconds (resume mode)\n\n" );
 	exit ( 1 );
 }
 
 int fork_with_pidfile ( void )
 {
 	FILE *fp;
 	pid_t pid;
 	
 	pid = fork ( );
 	
 	if ( pid > 0 )
 		exit ( 0 );
 	else if ( pid < 0 ) {
 		perror ( "forking failed" );
 		return 0;
 	}
 
 	signal ( SIGTERM, sig_handler );
 	signal ( SIGINT,  sig_handler );
 
 	// save pid
 	if (( fp = fopen ( PIDFILE, "w" ))) {
 		fprintf ( fp, "%d", getpid ( ));
 		fclose ( fp );
 
 		// detach
 		close ( 0 );
 		close ( 1 );
 		close ( 2 );
 
 		setpgid ( 0, 0 );
 
 		return 1;
 	}
 	else {
 		perror ( PIDFILE );
 		return 0;
 	}
 }
 
 int kill_with_pidfile ( void )
 {
 	FILE *fp;
 	pid_t pid;
 
 	if (( fp = fopen ( PIDFILE, "r" ))) {
 		if ( fscanf ( fp, "%d", &pid ) == 1 )
 			return ( kill ( pid, SIGTERM ) == 0 ) ? 1 : 0;
 		fclose ( fp );
 	}
 	return 0;
 }
 
 void remove_pidfile ( void )
 {
 	unlink ( PIDFILE );
 	
 	signal ( SIGTERM, SIG_DFL );
 	signal ( SIGINT,  SIG_DFL );	
 }
 
 
 int main ( int argc, char **argv ) 
 {
 	int mode = 0;
 	int ac_resusp = 0;
+	int fix_rtc = 0;
 	int opt;
 
-	while (( opt = getopt ( argc, argv, "a:rs" )) != EOF ) {
+	while (( opt = getopt ( argc, argv, "a:frs" )) != EOF ) {
 		switch ( opt ) {
 			case 's':
 				mode = 's';
 				break;
 			case 'r':
 				mode = 'r';
 				break;
 			case 'a':
 				ac_resusp = atoi ( optarg );
 				if ( ac_resusp < 30 ) {
 					ac_resusp = 120;
 					
 					fprintf ( stderr, "Warning: resuspend timeout must be >= 30 sec. -- now set to 120 sec\n" );
 				}
 				break;
+			case 'f':
+				fix_rtc = 1;
+				break;				
 			default:
 				usage ( );
 		}
 	}	
 	
 	if ( geteuid ( ) != 0 ) {
 		fprintf ( stderr, "You need root priviledges to run opiealarm." );
 		return 2;
 	}
 	
 	if ( !mode )
 		usage ( );
 
 	// kill running opiealarm
 	opiealarm_was_running = kill_with_pidfile ( );
 	remove_pidfile ( );
 
 	switch ( mode ) {
 		case 'r': return resume ( ac_resusp );
 		case 's':
-		default : return suspend ( );
+		default : return suspend ( fix_rtc );
 	}
 	return 0;
 }		
 		
 
-int suspend ( void )
+int suspend ( int fix_rtc )
 {
 	FILE *fp;
 	char buf [64];
-	time_t t;
-	struct tm *tm;
+	time_t alrt, syst, rtct;
+	struct tm alr, sys, rtc;
 	int fd;
-
+	int rtc_sys_diff;
+	
 	
 	if ( !fork_with_pidfile ( ))
 		return 3;
 		
 	log = fopen ( "/tmp/opiealarm.log", "w" ); 
 	log_msg ( "STARTING\n" );
 	
 
 
 	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 );
+	alrt = atoi ( buf );
 	
-	if ( t == 0 )
+	if ( alrt == 0 )
 		error_msg_and_die ( 0, "/etc/resumeat contains an invalid time description" );
 	
 	/* subtract 5 sec from event time... */
-	t -= 5;
+	alrt -= 5;
 
 	if ( log )	
-		fprintf ( log, "Setting RTC alarm to %d\n", t );
+		fprintf ( log, "Setting RTC alarm to %d\n", alrt );
 	
-	tm = gmtime ( &t );
+	alr = *gmtime ( &alrt );
 
+	// get system time
+	time ( &syst );
+	sys = *localtime ( &syst );		
+		
 	// Write alarm time to RTC
 	if (( fd = open ( "/dev/misc/rtc", O_RDWR )) < 0 )
 		error_msg_and_die ( 1, "/dev/misc/rtc" );	
+		
+	// get RTC time
+	if ( ioctl ( fd, RTC_ALM_SET, &rtc ) < 0 )
+		error_msg_and_die ( 1, "ioctl RTC_RD_TIME" );		
+	rtct = mktime ( &rtc );
+
+	rtc_sys_diff = ( syst - rtct ) - sys. tm_gmtoff;
+	
+	if ( fix_rtc && (( rtc_sys_diff < -4 ) || ( rtc_sys_diff > 4 ))) {
+		struct tm set;
+		
+		set = *gmtime ( &syst );
+	
+		fprintf ( log, "Correcting RTC: %d seconds\n", rtc_sys_diff );
+
+	    if ( ioctl ( fd, RTC_SET_TIME, &set ) < 0 )
+	       error_msg_and_die ( 1, "ioctl RTC_SET_TIME" );
+	}
+
 	// set alarm time
-	if ( ioctl ( fd, RTC_ALM_SET, tm ) < 0 )
+	if ( ioctl ( fd, RTC_ALM_SET, &alr ) < 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" );
 	
 	log_msg ( "SLEEPING\n" );
 			
 	// wait for alarm irq
 	if ( read ( fd, buf, sizeof( unsigned long )) < 0 )
 		error_msg_and_die ( 1, "read rtc alarm" );
 	
 	log_msg ( "WAKEUP\n" );
 	
 	// disable alarm irq
 	if ( ioctl ( fd, RTC_AIE_OFF, 0 ) < 0 ) 
 		error_msg_and_die ( 1, "ioctl RTC_AIE_OFF" );
 		
 	close ( fd );
 	
 	log_msg ( "EXITING\n" );
 	
 	fclose ( log );
 	remove_pidfile ( );
 	
 	return 0;
 }
 
 
 static int onac ( void )
 {
 	FILE *fp;
 	int on = 0;
 
 	if (( fp = fopen ( APMFILE, "r" ))) { 
 		int ac = 0;
 	
 		if ( fscanf ( fp, "%*[^ ] %*d.%*d 0x%*x 0x%x 0x%*x 0x%*x %*d%% %*i %*c", &ac ) == 1 )
 			on = ( ac == 0x01 ) ? 1 : 0;
 
 		fclose ( fp );
 	}
 	return on;
 }
 
 int resume ( int resuspend )
 {
 	FILE *fp;
 
diff --git a/root/etc/suspend-scripts/S46opiealarm b/root/etc/suspend-scripts/S46opiealarm
index 9b936e4..a41dae5 100755
--- a/root/etc/suspend-scripts/S46opiealarm
+++ b/root/etc/suspend-scripts/S46opiealarm
@@ -1,5 +1,5 @@
 #!/bin/sh
 # Starts opiealarm, which only runs while the iPaq sleeps 
 # and wakes it up when the RTC alarm goes off.
 
-/opt/QtPalmtop/bin/opiealarm -s
+/opt/QtPalmtop/bin/opiealarm -s -f