#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>

int s;

void sig(int n, siginfo_t *info, void *p) {
  if (info->si_code == SI_SIGIO)
    printf("\nsigio\n");

  printf("
si_code  : %d
si_fd    : %d\n\n", info->si_code, info->si_fd);
}

int main(void) {
  struct sigaction sa;
  struct sockaddr_in sad;

  sigemptyset(&sa.sa_mask);
  sigaddset(&sa.sa_mask, SIGIO);
  sa.sa_handler = 0;
  sa.sa_sigaction = sig;
  sa.sa_flags = SA_SIGINFO | SA_NOMASK;
  sa.sa_restorer = 0;
  sigaction(SIGIO, &sa, 0);

  s = socket(AF_INET, SOCK_STREAM, 0);
  sad.sin_family = AF_INET;
  sad.sin_port = htons(31331);
  sad.sin_addr.s_addr = inet_addr("127.0.0.1");
  connect(s, (const struct sockaddr *)&sad, sizeof(sad));

//  fcntl(s, F_SETFL, O_ASYNC);
//  fcntl(s, F_SETOWN, getpid());
  fcntl(s, 10, SIGIO);
  
//  fcntl(0, F_SETFL, O_ASYNC);
  fcntl(0, F_SETOWN, getpid());
//  fcntl(0, 10, SIGIO);


  while(1) sleep(1);

  return 0;
}