| -rw-r--r-- | core/opiealarm/opiealarm.c | 246 |
1 files changed, 117 insertions, 129 deletions
diff --git a/core/opiealarm/opiealarm.c b/core/opiealarm/opiealarm.c index d96ffaf..70e5415 100644 --- a/core/opiealarm/opiealarm.c +++ b/core/opiealarm/opiealarm.c @@ -1,12 +1,12 @@ -/* 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> -*/ +/* + * 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 and right after the iPAQ resumes operation. + * + * written and copyrighted by Robert Griebl <sandman@handhelds.org> + */ #include <stdio.h> @@ -29,6 +29,4 @@ #define APMFILE "/proc/apm" -FILE *log; // debug only - int resume ( int resuspend ); int suspend ( int fix_rtc ); @@ -38,41 +36,17 @@ 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 ); +void sig_handler_child ( int sig ); +void sig_handler_parent ( int sig ); int onac ( void ); static int opiealarm_was_running; - -static pid_t startpid = 0; +static pid_t parent_pid = 0; -void log_msg ( const char *msg ) -{ - if ( log ) { - fprintf ( log, msg ); - fflush ( log ); - } -} -void error_msg_and_die ( int perr, const char *msg ) +void sig_handler_child ( int sig ) { - if ( perr ) - log_msg ( strerror ( errno )); - log_msg ( msg ); - - if ( getpid ( ) != startpid ) - kill ( startpid, SIGUSR1 ); + // child got SIGUSR2 -> cleanup pidfile and exit - while ( 1 ) // pretend we are waiting on RTC, so opiealarm -r can kill us - sleep ( 1 ); -} - - -void sig_handler ( int sig ) -{ - if ( log ) { - log_msg ( "GOT SIGNAL -> EXITING\n" ); - fclose ( log ); - } remove_pidfile ( ); exit ( 0 ); @@ -81,4 +55,7 @@ void sig_handler ( int sig ) void sig_handler_parent ( int sig ) { + // parent got SIGUSR1 -> safe to exit now + + parent_pid = 0; exit ( 0 ); } @@ -102,4 +79,9 @@ int fork_with_pidfile ( void ) if ( pid > 0 ) { + // We can not just exit now, because the kernel could suspend + // the iPAQ just before the child process sets the RTC. + // Solution: just wait for SIGUSR1 - the child process will + // signal this when it thinks it is safe to exit. + signal ( SIGUSR1, sig_handler_parent ); while ( 1 ) @@ -112,6 +94,8 @@ int fork_with_pidfile ( void ) } - signal ( SIGTERM, sig_handler ); - signal ( SIGINT, sig_handler ); + // child process needs to react to SIGUSR2. This is sent when + // a new opiealarm process is started. + + signal ( SIGUSR2, sig_handler_child ); // save pid @@ -139,19 +123,23 @@ int kill_with_pidfile ( void ) FILE *fp; pid_t pid; + int res = 0; + + // terminate a running opiealarm child process + // return 1 if we really killed one if (( fp = fopen ( PIDFILE, "r" ))) { if ( fscanf ( fp, "%d", &pid ) == 1 ) - return ( kill ( pid, SIGTERM ) == 0 ) ? 1 : 0; + res = ( kill ( pid, SIGUSR2 ) == 0 ) ? 1 : 0; fclose ( fp ); } - return 0; + return res; } void remove_pidfile ( void ) { - unlink ( PIDFILE ); - - signal ( SIGTERM, SIG_DFL ); - signal ( SIGINT, SIG_DFL ); + // child is about to exit - cleanup + + unlink ( PIDFILE ); + signal ( SIGUSR2, SIG_DFL ); } @@ -196,19 +184,24 @@ int main ( int argc, char **argv ) usage ( ); + + parent_pid = getpid ( ); + // kill running opiealarm - startpid = getpid ( ); opiealarm_was_running = kill_with_pidfile ( ); remove_pidfile ( ); switch ( mode ) { - case 'r': return resume ( ac_resusp ); + case 'r': opt = resume ( ac_resusp ); + break; case 's': - default : return suspend ( fix_rtc ); + default : opt = suspend ( fix_rtc ); + break; } - return 0; + + parent_pid = 0; + return opt; } - int suspend ( int fix_rtc ) { @@ -223,94 +216,78 @@ int suspend ( int fix_rtc ) 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" ); + // we are the child process from here on ... - fclose ( fp ); + tzset ( ); // not sure if it is really needed -- it probably doesn't hurt ... - alrt = atoi ( buf ); + do { // try/catch simulation - if ( alrt == 0 ) - error_msg_and_die ( 0, "/etc/resumeat contains an invalid time description" ); + // read the wakeup time from /etc/resumeat + if (!( fp = fopen ( "/etc/resumeat", "r" ))) + break; // ( 1, "/etc/resumeat" ); - alrt -= 5; // wake up 5 sec before the specified time - + if ( !fgets ( buf, sizeof( buf ) - 1, fp )) + break; // ( 1, "/etc/resumeat" ); - if ( log ) - fprintf ( log, "Setting RTC alarm to %d\n", alrt ); - - tzset ( ); + fclose ( fp ); - alr = *gmtime ( &alrt ); - - // get system time - time ( &syst ); - sys = *localtime ( &syst ); + alrt = atoi ( buf ); // get the alarm time + if ( alrt == 0 ) + break; // ( 0, "/etc/resumeat contains an invalid time description" ); + alrt -= 5; // wake up 5 sec before the specified time + alr = *gmtime ( &alrt ); + + time ( &syst );// get the UNIX system time + 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" ); + if (( fd = open ( "/dev/misc/rtc", O_RDWR )) < 0 ) // open the RTC device + break; // ( 1, "/dev/misc/rtc" ); - // get RTC time - memset ( &rtc, 0, sizeof ( struct tm )); - if ( ioctl ( fd, RTC_RD_TIME, &rtc ) < 0 ) - error_msg_and_die ( 1, "ioctl RTC_RD_TIME" ); - rtct = mktime ( &rtc ); + memset ( &rtc, 0, sizeof ( struct tm )); // get the RTC time + if ( ioctl ( fd, RTC_RD_TIME, &rtc ) < 0 ) + break; // ( 1, "ioctl RTC_RD_TIME" ); + rtct = mktime ( &rtc ); - fprintf ( log, "System time: %02d.%02d.%04d %02d:%02d:%02d DST: %d (TZ: %s, offset: %d)\n", sys. tm_mday, sys. tm_mon + 1, sys. tm_year + 1900, sys. tm_hour, sys. tm_min, sys. tm_sec, sys. tm_isdst, sys. tm_zone, sys. tm_gmtoff ); - fprintf ( log, "RTC time: %02d.%02d.%04d %02d:%02d:%02d DST: %d (TZ: %s, offset: %d)\n", rtc. tm_mday, rtc. tm_mon + 1, rtc. tm_year + 1900, rtc. tm_hour, rtc. tm_min, rtc. tm_sec, rtc. tm_isdst, rtc. tm_zone, rtc. tm_gmtoff ); - fprintf ( log, "Wakeup time: %02d.%02d.%04d %02d:%02d:%02d DST: %d (TZ: %s, offset: %d)\n", alr. tm_mday, alr. tm_mon + 1, alr. tm_year + 1900, alr. tm_hour, alr. tm_min, alr. tm_sec, alr. tm_isdst, alr. tm_zone, alr. tm_gmtoff ); - - fprintf ( log, "System/RTC diff: %d seconds\n", ( syst - rtct ) - sys. tm_gmtoff ); - - - rtc_sys_diff = ( syst - rtct ) - sys. tm_gmtoff; + rtc_sys_diff = ( syst - rtct ) - sys. tm_gmtoff; // calculate the difference between system and hardware time - if ( fix_rtc && (( rtc_sys_diff < -4 ) || ( rtc_sys_diff > 4 ))) { - struct tm set; - - set = *gmtime ( &syst ); + if ( fix_rtc && (( rtc_sys_diff < -3 ) || ( rtc_sys_diff > 3 ))) { + struct tm set; + set = *gmtime ( &syst ); + + // if the difference between system and hardware time is more than 3 seconds, + // we have to set the RTC (hwclock --systohc), or alarms won't work reliably. - fprintf ( log, "Correcting RTC: %d seconds\n", rtc_sys_diff ); + if ( ioctl ( fd, RTC_SET_TIME, &set ) < 0 ) + break; // ( 1, "ioctl RTC_SET_TIME" ); + } - if ( ioctl ( fd, RTC_SET_TIME, &set ) < 0 ) - error_msg_and_die ( 1, "ioctl RTC_SET_TIME" ); - } + if ( ioctl ( fd, RTC_ALM_SET, &alr ) < 0 ) // set RTC alarm time + break; // ( 1, "ioctl RTC_ALM_SET" ); + if ( ioctl ( fd, RTC_AIE_ON, 0 ) < 0 ) + break; // ( 1, "ioctl RTC_AIE_ON" ); // enable RTC alarm irq - // set alarm time - 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" ); - - if ( log ) - fprintf( log, "SIGUSR: pid %d - SLEEPING: pid %d\n", startpid, getpid ( )); - kill ( startpid, SIGUSR1 ); + // tell the parent it is safe to exit now .. we have set the RTC alarm + kill ( parent_pid, SIGUSR1 ); - // wait for alarm irq - if ( read ( fd, buf, sizeof( unsigned long )) < 0 ) - error_msg_and_die ( 1, "read rtc alarm" ); + if ( read ( fd, buf, sizeof( unsigned long )) < 0 ) // wait for the RTC alarm irq + break; // ( 1, "read rtc alarm" ); - log_msg ( "WAKEUP\n" ); + // iPAQ woke up via RTC irq -- otherwise we would have received a SIGUSR2 + // from the "resume instance" of opiealarm. - // disable alarm irq - if ( ioctl ( fd, RTC_AIE_OFF, 0 ) < 0 ) - error_msg_and_die ( 1, "ioctl RTC_AIE_OFF" ); + if ( ioctl ( fd, RTC_AIE_OFF, 0 ) < 0 ) // disable RTC alarm irq + break; // ( 1, "ioctl RTC_AIE_OFF" ); - close ( fd ); - - log_msg ( "EXITING\n" ); + close ( fd ); - fclose ( log ); - remove_pidfile ( ); + remove_pidfile ( ); // normal exit + return 0; + + } while ( 0 ); + kill ( parent_pid, SIGUSR1 ); // parent is still running - it can exit now + + while ( 1 ) // pretend that we are waiting on RTC, so opiealarm -r can kill us + sleep ( 1000 ); // if we don't do this, the "resuspend on AC" would be triggerd return 0; } @@ -322,4 +299,6 @@ int onac ( void ) int on = 0; + // check the apm proc interface for AC status + if (( fp = fopen ( APMFILE, "r" ))) { int ac = 0; @@ -339,5 +318,8 @@ int resume ( int resuspend ) // re-suspend when on AC (optional) when woken up via RTC - if ( !opiealarm_was_running ) { // opiealarm -s got it's RTC signal -> wake up by RTC + if ( !opiealarm_was_running ) { + // if opiealarm -s didn't wake up via RTC, the old process gets killed + // by kill_by_pidfile(), which is recorded in opiealarm_was_running + if ( resuspend && onac ( )) { time_t start, now; @@ -346,7 +328,11 @@ int resume ( int resuspend ) if ( !fork_with_pidfile ( )) return 4; - kill ( startpid, SIGUSR1 ); + + // we can't wait for the resuspend timeout in the parent process. + // so we fork and tell the parent it can exit immediatly + + kill ( parent_pid, SIGUSR1 ); - // sleep <resuspend> sec (not less!) + // sleep <resuspend> seconds - this method is much more precise than sleep() ! time ( &start ); do { @@ -355,6 +341,5 @@ int resume ( int resuspend ) } while (( now - start ) < resuspend ); - if ( onac ( )) { // still on ac - // system() without fork + if ( onac ( )) { // still on ac ? argv[0] = "qcop"; argv[1] = "QPE/Desktop"; @@ -363,4 +348,6 @@ int resume ( int resuspend ) // hard coded for now ...but needed + // another way would be to simulate a power-button press + setenv ( "LOGNAME", "root", 1 ); setenv ( "HOME", "/root", 1 ); @@ -370,4 +357,5 @@ int resume ( int resuspend ) remove_pidfile ( ); + // no need for system() since this process is no longer usefull anyway execv ( "/opt/QtPalmtop/bin/qcop", argv ); |