Function test_errors

test/core/test_select_blocking.c:216–237

Check if select handles error returns and errno correctly

// Check if select handles error returns and errno correctly
void test_errors() {
  printf("test_errors\n");
  struct timeval tv = {0, 0};
  fd_set readfds;

  // Negative nfds should fail with EINVAL
  FD_ZERO(&readfds);
  errno = 0;
  assert(select(-1, &readfds, NULL, NULL, &tv) == -1);
  assert(errno == EINVAL);

  // Closed / invalid fd should fail with EBADF
  int pipe_fds[2];
  assert(pipe(pipe_fds) == 0);
  close(pipe_fds[0]); // close read end
  FD_ZERO(&readfds);
  FD_SET(pipe_fds[0], &readfds);
  errno = 0;
  assert(select(pipe_fds[0] + 1, &readfds, NULL, NULL, &tv) == -1);
  assert(errno == EBADF);
  close(pipe_fds[1]);
}

int main() {
  test_select_in_threads();