author | sandman <sandman> | 2002-07-01 22:28:22 (UTC) |
---|---|---|
committer | sandman <sandman> | 2002-07-01 22:28:22 (UTC) |
commit | b34df43c4d141b6845a6251e8f52f7daf3d1a867 (patch) (side-by-side diff) | |
tree | d829feab33887adcf47ac56f6625ea2fb6414281 | |
parent | cce43bef3e68b007f027f52328972b6b86af1098 (diff) | |
download | opie-b34df43c4d141b6845a6251e8f52f7daf3d1a867.zip opie-b34df43c4d141b6845a6251e8f52f7daf3d1a867.tar.gz opie-b34df43c4d141b6845a6251e8f52f7daf3d1a867.tar.bz2 |
This is the release version with all debug stuff thrown out -- in return
I have heavily commented the code, so maybe someone else besides me
culd get the hang of this programm.
-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 @@ -1,171 +1,159 @@ -/* 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> #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 ( 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 ); +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 ); } void sig_handler_parent ( int sig ) { + // parent got SIGUSR1 -> safe to exit now + + parent_pid = 0; exit ( 0 ); } void usage ( void ) { 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 ) { + // 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 ) sleep ( 1000 ); exit ( 0 ); } else if ( pid < 0 ) { perror ( "forking failed" ); return 0; } - 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 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; + 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 ); } 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:frs" )) != EOF ) { switch ( opt ) { case 's': mode = 's'; break; case 'r': @@ -182,199 +170,199 @@ int main ( int argc, char **argv ) 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 ( ); + + 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 ) { FILE *fp; char buf [64]; 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" ); + // 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; } int onac ( void ) { FILE *fp; int on = 0; + // check the apm proc interface for AC status + 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; // 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; char *argv [4]; 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 { sleep ( 1 ); time ( &now ); } while (( now - start ) < resuspend ); - if ( onac ( )) { // still on ac - // system() without fork + if ( onac ( )) { // still on ac ? argv[0] = "qcop"; argv[1] = "QPE/Desktop"; argv[2] = "suspend()"; argv[3] = 0; // hard coded for now ...but needed + // another way would be to simulate a power-button press + setenv ( "LOGNAME", "root", 1 ); setenv ( "HOME", "/root", 1 ); setenv ( "LD_LIBRARY_PATH", "/opt/QtPalmtop/lib", 1 ); setenv ( "QTDIR", "/opt/QtPalmtop", 1 ); remove_pidfile ( ); + // no need for system() since this process is no longer usefull anyway execv ( "/opt/QtPalmtop/bin/qcop", argv ); perror ( "exec for qcop failed" ); return 5; } } } return 0; } |