source: trunk/instant_messenger/socket/BKP_20071105/BKP_20071026/BKP_20071019/BKP_20071018/BKP_20071009/BKP_20071008/BKP/BKP/signal.c @ 151

#include <signal.h>
#include <stdio.h>
#include <stdlib.h>

/* This flag controls termination of the main loop.  */
volatile sig_atomic_t keep_going = 1;

/* The signal handler just clears the flag and re-enables itself.  */
        void 
catch_alarm (int sig)
{
        keep_going = 0;
        puts("ALARM");
        signal (sig, catch_alarm);
}

        void 
do_stuff (void)
{
        puts ("Doing stuff while waiting for alarm....");
}

        int
main (void)
{
        /* Establish a handler for SIGALRM signals.  */
        signal (SIGALRM, catch_alarm);

        /* Set an alarm to go off in a little while.  */
        alarm (2);

        /* Check the flag once in a while to see when to quit.  */
        while (keep_going)
                do_stuff ();

        return EXIT_SUCCESS;
}