tests/getitimer.c

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#include "test_skel.h"

int main(int argc, char *argv[]) {
  // We need an invalid timer value. The assert()'s below should
  // be static asserts but it is not available in older C versions.
#define kInvalidTimer 9999
  assert(kInvalidTimer != ITIMER_REAL);
  assert(kInvalidTimer != ITIMER_VIRTUAL);
  assert(kInvalidTimer != ITIMER_PROF);

  // This should fail with EINVAL.
  struct kernel_itimerval curr_itimer;
  assert(sys_getitimer(kInvalidTimer, &curr_itimer) == -1);
  assert(errno == EINVAL);

  // Create a read-only page.
  size_t page_size = getpagesize();
  void* read_only_page = sys_mmap(NULL, page_size, PROT_READ,
                                  MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
  assert(read_only_page != MAP_FAILED);

  // This should fail with EFAULT.
  assert(sys_getitimer(ITIMER_REAL,
                       (struct kernel_itimerval*) read_only_page) == -1);
  assert(errno == EFAULT);

  // This should complete without an error.
  assert(sys_getitimer(ITIMER_REAL, &curr_itimer) == 0);

  // Set up a real time timer with very long interval and value so that
  // we do not need to handle SIGALARM in test.
  struct kernel_itimerval new_itimer;
  const time_t kIntervalSec = 60 * 60 * 24 * 365;  // One year.
  const long kIntervalUSec = 123;
  new_itimer.it_interval.tv_sec = kIntervalSec;
  new_itimer.it_interval.tv_usec = kIntervalUSec;
  new_itimer.it_value = new_itimer.it_interval;
  assert(sys_setitimer(ITIMER_REAL, &new_itimer, NULL) == 0);

  assert(sys_getitimer(ITIMER_REAL, &curr_itimer) == 0);
  assert(kernel_timeval_eq(&curr_itimer.it_interval, &new_itimer.it_interval));

  // Disable timer.
  struct kernel_itimerval empty_itimer;
  empty_itimer.it_interval.tv_sec = 0;
  empty_itimer.it_interval.tv_usec = 0;
  empty_itimer.it_value = empty_itimer.it_interval;
  assert(sys_setitimer(ITIMER_REAL, &empty_itimer, NULL) == 0);

  // We should read back an empty itimer.
  assert(sys_getitimer(ITIMER_REAL, &curr_itimer) == 0);
  assert(kernel_itimerval_eq(&curr_itimer, &empty_itimer));

  return 0;
}