37 lines
671 B
C
37 lines
671 B
C
#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;
|
|
}
|