#include <stdio.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>

int main(int argc, char **argv) {
  fd_set rfds, wfds, efds;
  int s, rc;
  struct timeval timeout;
  char buf[1025];

  s = socket(PF_INET, SOCK_STREAM, 0);
  if (s == -1) {
    perror("couldn't create socket");
    return -1;
  }

  FD_ZERO(&rfds);
  FD_SET(s, &rfds);
  FD_ZERO(&wfds);
  FD_SET(s, &wfds);
  FD_ZERO(&efds);
  FD_SET(s, &efds);
  timeout.tv_sec = timeout.tv_usec = 0;
  rc = select(s + 1, &rfds, &wfds, &efds, &timeout);
  if (rc == -1) {
    perror("select");
    return -1;
  }
  printf("select result=%d\n", rc);
  if (FD_ISSET(s, &rfds)) {
    rc = read(s, buf, 1024);
    if (rc == -1) {
      perror("read");
      return -1;
    }
    printf("read result=%d\n", rc);
  }

  return 0;
}