nodejs/test/wasi/c/poll.c

#include <assert.h>
#include <poll.h>
#include <time.h>
#include <unistd.h>

int main(void) {
  struct pollfd fds[2];
  time_t before, now;
  int ret;

  fds[0] = (struct pollfd){.fd = 1, .events = POLLOUT, .revents = 0};
  fds[1] = (struct pollfd){.fd = 2, .events = POLLOUT, .revents = 0};

  ret = poll(fds, 2, -1);
  assert(ret == 2);
  assert(fds[0].revents == POLLOUT);
  assert(fds[1].revents == POLLOUT);

  fds[0] = (struct pollfd){.fd = 0, .events = POLLIN, .revents = 0};
  time(&before);
  ret = poll(fds, 1, 2000);
  time(&now);
  assert(ret == 0);
  assert(now - before >= 2);

  sleep(1);
  time(&now);
  assert(now - before >= 3);

  return 0;
}