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- #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;
- 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;
- }
-