slight bit of rearranging to ensure that the rtc time gets set if using -s regardless of whether resumeat contains a valid alarm

1 files changed, 42 insertions, 31 deletions

diff --git a/core/opiealarm/opiealarm.c b/core/opiealarm/opiealarm.c
index bb2e684..5ea24b7 100644
--- a/core/opiealarm/opiealarm.c
+++ b/core/opiealarm/opiealarm.c
@@ -1,369 +1,380 @@
 /*
  * 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"
 
 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_child ( int sig );
 void sig_handler_parent ( int sig );
 int onac ( void );
 
 static int opiealarm_was_running;
 static pid_t parent_pid = 0;
 
 
 
 void sig_handler_child ( int sig )
 {
         // child got SIGUSR2 -> cleanup pidfile and exit
 
         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;
         }
 
         // 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 )
                         res = ( kill ( pid, SIGUSR2 ) == 0 ) ? 1 : 0;
                 fclose ( fp );
         }
         return res;
 }
 
 void remove_pidfile ( void )
 {
         // 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':
                                 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 ( );
 
 
         parent_pid = getpid ( );
 
         // kill running opiealarm
         opiealarm_was_running = kill_with_pidfile ( );
         remove_pidfile ( );
 
         switch ( mode ) {
                 case 'r': opt = resume ( ac_resusp );
                           break;
                 case 's':
                 default : opt = suspend ( fix_rtc );
                           break;
         }
         
         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;
 
         // we are the child process from here on ...
 
         tzset ( );  // not sure if it is really needed -- it probably doesn't hurt ...
         
-        do { // try/catch simulation
+        time ( &syst );// get the UNIX system time
+                sys = *localtime ( &syst );     
         
-                // read the wakeup time from /etc/resumeat
-                if (!( fp = fopen ( "/etc/resumeat", "r" ))) 
-                        break; //  ( 1, "/etc/resumeat" );
-        
-                if ( !fgets ( buf, sizeof( buf ) - 1, fp ))
-                        break; //  ( 1, "/etc/resumeat" );
-
-                fclose ( fp );
-        
-                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 );     
+        do {
                 
                 if (( fd = open ( "/dev/misc/rtc", O_RDWR )) < 0 )
                         if (( fd = open ( "/dev/rtc", O_RDWR )) < 0 )
                                         break; //  ( 1, "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 );
 
                 rtc_sys_diff = ( syst - rtct ) - sys. tm_gmtoff;  // calculate the difference between system and hardware time
         
                 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.
-        
-                    if ( ioctl ( fd, RTC_SET_TIME, &set ) < 0 )
-                       break; //  ( 1, "ioctl RTC_SET_TIME" );
+
+                        if ( ioctl ( fd, RTC_SET_TIME, &set ) < 0 )
+                                break; //  ( 1, "ioctl RTC_SET_TIME" );
                 }
 
+                // read the wakeup time from /etc/resumeat
+                if (!( fp = fopen ( "/etc/resumeat", "r" ))) 
+                        break; //  ( 1, "/etc/resumeat" );
+        
+                if ( !fgets ( buf, sizeof( buf ) - 1, fp ))
+                        break; //  ( 1, "/etc/resumeat" );
+
+                fclose ( fp );
+        
+                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 );
+        
                 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 )
+        
+                 if ( ioctl ( fd, RTC_AIE_ON, 0 ) < 0 )
                         break; //  ( 1, "ioctl RTC_AIE_ON" );   // enable RTC alarm irq
 
                 // tell the parent it is safe to exit now .. we have set the RTC alarm
                 kill ( parent_pid, SIGUSR1 );
                         
                 if ( read ( fd, buf, sizeof( unsigned long )) < 0 ) // wait for the RTC alarm irq
                         break; //  ( 1, "read rtc alarm" );
         
                 // iPAQ woke up via RTC irq -- otherwise we would have received a SIGUSR2
                 // from the "resume instance" of opiealarm.
         
                 if ( ioctl ( fd, RTC_AIE_OFF, 0 ) < 0 )     // disable RTC alarm irq
                         break; //  ( 1, "ioctl RTC_AIE_OFF" );
-                
+
                 close ( fd );
-        
-                remove_pidfile ( ); // normal exit
-                        return 0;
                 
-        } while ( 0 );
+                remove_pidfile ( );
+                
+                        return 0;
+
+        } while ( 0 )
+
+        if ( fp != NULL )
+                fclose ( fp );
         
-        kill ( parent_pid, SIGUSR1 );  // parent is still running - it can exit now
+        if ( fd != -1 )
+                close ( fd );
+
+        kill ( parent_pid, SIGUSR1 );
 
                 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 ) { 
                 // 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;
                                 
                         // 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> 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 ?
                                 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;
 }