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// RUN: %clangxx -O0 -g %s -o %t && %run %t | FileCheck %s
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <sys/timerfd.h>
#include <unistd.h>
int main (int argc, char** argv)
{
int fd = timerfd_create(CLOCK_REALTIME, 0);
assert(fd >= 0);
struct itimerspec its;
its.it_value.tv_sec = 0;
its.it_value.tv_nsec = 1000000;
its.it_interval.tv_sec = its.it_value.tv_sec;
its.it_interval.tv_nsec = its.it_value.tv_nsec;
int res = timerfd_settime(fd, 0, &its, NULL);
assert(res != -1);
struct itimerspec its2;
res = timerfd_settime(fd, 0, &its, &its2);
assert(res != -1);
assert(its2.it_interval.tv_sec == its.it_interval.tv_sec);
assert(its2.it_interval.tv_nsec == its.it_interval.tv_nsec);
assert(its2.it_value.tv_sec <= its.it_value.tv_sec);
assert(its2.it_value.tv_nsec <= its.it_value.tv_nsec);
struct itimerspec its3;
res = timerfd_gettime(fd, &its3);
assert(res != -1);
assert(its3.it_interval.tv_sec == its.it_interval.tv_sec);
assert(its3.it_interval.tv_nsec == its.it_interval.tv_nsec);
assert(its3.it_value.tv_sec <= its.it_value.tv_sec);
assert(its3.it_value.tv_nsec <= its.it_value.tv_nsec);
unsigned long long buf;
res = read(fd, &buf, sizeof(buf));
assert(res == 8);
assert(buf >= 1);
res = close(fd);
assert(res != -1);
printf("DONE\n");
// CHECK: DONE
return 0;
}
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