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#include <signal.h>
#include <assert.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
static volatile int alarms_fired = 0;
static void sigalrm_handler(int signal) {
if(signal == SIGALRM)
alarms_fired++;
}
int main() {
signal(SIGALRM, sigalrm_handler);
alarms_fired = 0;
unsigned int ret = alarm(10);
assert(!ret);
sleep(1);
ret = alarm(1);
assert(ret == 9);
sleep(2);
if(alarms_fired != 1) {
fprintf(stderr, "alarm handler fired %u times instead of 1\n", alarms_fired);
exit(1);
}
}
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