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#include <assert.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <time.h>
int main() {
struct sigevent evp;
memset(&evp, 0, sizeof(evp));
sigset_t set;
sigemptyset(&set);
sigaddset(&set, SIGUSR1);
sigprocmask(SIG_BLOCK, &set, 0);
evp.sigev_notify = SIGEV_SIGNAL;
evp.sigev_signo = SIGUSR1;
struct timeval start;
gettimeofday(&start, NULL);
timer_t timer;
if (timer_create(CLOCK_MONOTONIC, &evp, &timer)) {
perror("timer_create");
exit(1);
}
struct itimerspec spec;
memset(&spec, 0, sizeof(spec));
spec.it_value.tv_sec = 1;
spec.it_value.tv_nsec = 0;
int sig;
timer_settime(timer, 0, &spec, NULL);
sigwait(&set, &sig);
struct timeval end;
gettimeofday(&end, NULL);
timer_delete(timer);
double diff = end.tv_sec - start.tv_sec;
diff += (end.tv_usec - start.tv_usec) / 1000000.0;
assert(diff >= 1.0);
return 0;
}
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