2009/12/31 ibrahim <ibrahim....@asgatech.com>:
> void signal_handler(int sig)
> {
> switch(sig) {
> case SIGHUP:
> log_message(LOG_FILE,"hangup signal catched");
> break;
> case SIGTERM:
> log_message(LOG_FILE,"terminate signal catched");
> break;
> }
> }
>
> /**
> create background process out of the application, source code taken from:
> http://www.enderunix.org/docs/eng/daemon.php
> with some minor modifications
> */
> void init_daemon()
> {
> int i,lfp;
> char str[10];
> if(getppid()==1)
> return; /* already a daemon */
> i=fork();
> if (i<0)
> exit(1); /* fork error */
> if (i>0)
> exit(0); /* parent exits */
>
> /* child (daemon) continues */
> setsid(); /* obtain a new process group */
>
> for (i=getdtablesize();i>=0;--i)
> close(i); /* close all descriptors */
> i=open("/dev/null",O_RDWR); dup(i); dup(i); /* handle standart I/O */
>
> umask(027); /* set newly created file permissions */
>
> chdir(RUNNING_DIR); /* change running directory */
> lfp=open(LOCK_FILE,O_RDWR|O_CREAT,0640);
> if (lfp<0)
> exit(1); /* can not open */
> if (lockf(lfp,F_TLOCK,0)<0)
> exit(0); /* can not lock */
> /* first instance continues */
> sprintf(str,"%d\n",getpid());
> write(lfp,str,strlen(str)); /* record pid to lockfile */
> signal(SIGCHLD,SIG_IGN); /* ignore child */
> signal(SIGTSTP,SIG_IGN); /* ignore tty signals */
> signal(SIGTTOU,SIG_IGN);
> signal(SIGTTIN,SIG_IGN);
> signal(SIGHUP,signal_handler); /* catch hangup signal */
> signal(SIGTERM,signal_handler); /* catch kill signal */
> }
> int main(int argc, char *argv[])
> {
> // first, create the daemon
> init_daemon();
> QCoreApplication <http://doc.trolltech.com/latest/QCoreApplication.html>
> a(argc, argv);
>
> return a.exec();
> }
>
> the code doesn't handle signals (for example, a termination signal). So,
> when I run it from the command line, and try to kill it, it refuses to
> get killed!!! the only way to kill the process is to restart the phone !!
kill -9 pid doesn't work?
One thing that I recall is that when a child process hangs on exit,
the parent process doesn't handle the CHILD signal. But since you exit
directly, I would guess that is not related.
Oh, you don't have a 'exit()' in your signal handler. Man page says
though that once the signal occurs, the signal is reset to DFL, so the
second 'kill -TERM pid' should work.
> I really suspect that creating a QCoreApplication instance in the main
> method forks a new process other than the one i forked in the
> init_daemom() method. But i can't find any clue . On the other hand, i
> can't init my qt app without creating a QCoreApplication instance -says
> qt documentation.
Have you tried to swap the first two code lines from your main? If
QCoreApp sets up a signal handler, then it replaces yours.
Koos
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