Problem of signal loss

["sakib mondal" <sakib@hotmail.com>]

Hi,

Of the existing active mailing lists, I thought this is the list where I can 
get help on my problem.

I am facing the problem of intermittent signal loss in RH (2.4.18-3). The 
program runs in a loop, and is able to respond to individual signals 
(SIGUSR1 and SIGUSR2). In fact, it works well with multiple occurence of the 
same signal. However, if SIGUSR2 is sent after SIGUSR1, the program responds 
to the SIGUSR1, but does not respond to SIGUSR2. It is to be noted that if a 
SIGUSR1 is raised before SIGUSR2, the behaviour is normal. I shall 
appreciate any pointer to why this is happening.

Regards
Sakib




The code snippet is given below.

static void signal_handler(int num)
{

   if (signal(num, signal_handler) == SIG_ERR) {
       syserr_quit("Unable to install signal handler");
   }

   switch(num) {
      case SIGUSR1:
       proc_USR1();
       break;
    case SIGUSR2:
       proc_USR2();
       break;
    default:
       log_err("Impossible signal received.");
       break;
   }
}





int main(int argc, char *argv[])
{
....

    if (signal(SIGUSR1, signal_handler) == SIG_ERR) {
       syserr_quit("Unable to install SIGUSR1 handler");
   }

   if (signal(SIGUSR2, signal_handler) == SIG_ERR) {
       syserr_quit("Unable to install SIGUSR2 handler");
   }

   while (1) {
       fd_set fd_read;

       FD_ZERO(&fd_read);
       FD_SET(a_socket, &fd_read);
       while (select(FD_SETSIZE, &fd_read, NULL, NULL, NULL) < 0) {
           if (errno != EINTR) {
               syslog_err("Error in listening");
           }
       }
       some_other_function();
   }
}

_________________________________________________________________
Mobile, masti, magic! Cool ringtones & logos.  http://www.msn.co.in/mobile/ 
Get noticed.

-
: send the line "unsubscribe linux-net" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html