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#include <signal.h>
#include <sys/time.h>
#include <stdio.h>
#include <stdlib.h>
#define RATE 5 /* 5 Hz */
int count = 0;
void alarm_handler(int x) {
count++;
if ((count > 0) && ((count % 10) == 0)) {
printf("Number of timer callbacks: %d\n", count);
}
signal(SIGALRM, alarm_handler);
}
int main()
{
struct timeval initial = {0, 1000000/RATE};
struct timeval interval = {0, 1000000/RATE};
struct itimerval t;
t.it_value = initial;
t.it_interval = interval;
if (signal(SIGALRM, alarm_handler) != SIG_ERR) {
if (!setitimer(ITIMER_REAL, &t, 0)) {
/* Perform other tasks waiting for our SIGALRMs */
while(count <= 50) {
;
}
}
}
exit(0);
}
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