| -rw-r--r-- | core/opiealarm/opiealarm.c | 102 |
1 files changed, 89 insertions, 13 deletions
diff --git a/core/opiealarm/opiealarm.c b/core/opiealarm/opiealarm.c index 071cb24..33d631d 100644 --- a/core/opiealarm/opiealarm.c +++ b/core/opiealarm/opiealarm.c @@ -18,28 +18,46 @@ #include <unistd.h> #include <errno.h> #include <time.h> #include <stdlib.h> +#include <syslog.h> +#include <signal.h> +#define PIDFILE "/var/run/opiealarm.pid" + +FILE *log; + + +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 ) - perror ( msg ); - else - fprintf ( stderr, "%s\n", msg ); + log_msg ( strerror ( errno )); + log_msg ( msg ); + + unlink ( PIDFILE ); exit ( 1 ); } -void extractevent ( ) + +void suspend_on_rtc ( ) { 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 )) @@ -53,39 +71,97 @@ void extractevent ( ) 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" ); + if ( log ) + fprintf ( log, "Setting RTC alarm to %d\n", t ); + tm = gmtime ( &t ); + + // Write alarm time to RTC + if (( fd = open ( "/dev/misc/rtc", O_RDWR ) < 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" ); - + 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 ); } +void sig_handler ( int sig ) +{ + log_msg ( "GOT SIGNAL -> EXITING\n" ); + fclose ( log ); + unlink ( PIDFILE ); + exit ( 0 ); +} + + int main ( ) { - if ( geteuid ( ) != 0 ) - error_msg_and_die ( 0, "You need root priviledges to run opiealarm." ); + FILE *fp; + pid_t pid; + + if ( geteuid ( ) != 0 ) { + fprintf ( stderr, "You need root priviledges to run opiealarm." ); + return 1; + } + + pid = fork ( ); + + if ( pid > 0 ) + return 0; + else if ( pid < 0 ) { + perror ( "Could not fork." ); + return 2; + } + + // save pid + if (!( fp = fopen ( PIDFILE, "w" ))) { + perror ( PIDFILE ); + return 3; + } + + fprintf ( fp, "%d", getpid ( )); + fclose ( fp ); + + // detach + close ( 0 ); + close ( 1 ); + close ( 2 ); + + setpgid ( 0, 0 ); + + log = fopen ( "/tmp/opiealarm.log", "w" ); + log_msg ( "STARTING\n" ); + + signal ( SIGTERM, sig_handler ); + signal ( SIGINT, sig_handler ); extractevent ( ); + + signal ( SIGTERM, SIG_DFL ); + signal ( SIGINT, SIG_DFL ); + + log_msg ( "EXITING\n" ); + + fclose ( log ); + unlink ( PIDFILE ); return 0; } |