1 #include <stdio.h> 2 #include <signal.h> 3 #include <unistd.h> 4 static int sigalrm_received = 0; 5 6 static void sigalrm_handler(int signr) 7 { 8 sigalrm_received++; 9 } 10 11 int main (int argc, char *argv[]) 12 { 13 struct sigaction sa; 14 fprintf(stderr, "starting ...\n"); 15 sa.sa_handler = sigalrm_handler; 16 sigemptyset(&sa.sa_mask); 17 sa.sa_flags = 0; 18 19 if (sigaction (SIGALRM, &sa, NULL) != 0) 20 perror("sigaction"); 21 if (kill(getpid(), SIGALRM) != 0) 22 perror("kill 1"); 23 24 if (sigalrm_received == 1) 25 fprintf (stderr, "ok: 1st SIGALRM received\n"); 26 else 27 fprintf (stderr, "wrong 1st: unexpected value %d sigalrm_received\n", 28 sigalrm_received); 29 30 if (kill(getpid(), SIGALRM) != 0) 31 perror("kill 2"); 32 33 if (sigalrm_received == 2) 34 fprintf (stderr, "ok: 2nd SIGALRM received\n"); 35 else 36 fprintf (stderr, "wrong 2nd: unexpected value %d sigalrm_received\n", 37 sigalrm_received); 38 39 return 0; 40 } 41
