/*
** select.c -- a select() demo
*/

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

#define STDIN 0  // file descriptor for standard input

int main(void){
    struct timeval tv;
    fd_set readfds;

    tv.tv_sec = 2;
    tv.tv_usec = 500000;

    FD_ZERO(&readfds);
    FD_SET(STDIN, &readfds);

    // don't care about writefds and exceptfds:
    select(STDIN+1, &readfds, NULL, NULL, &tv);

    if (FD_ISSET(STDIN, &readfds))
        printf("A key was pressed!\n");
    else
        printf("Timed out.\n");

    return 0;
}

int checkprt(int port, char *ip){
  int test = 0;
  int sockfd;
  struct sockaddr_in servaddr;
  sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if(sockfd < 0) {
      printf("error. cannot creat socket\n");
      return ERROR;
    }
  servaddr.sin_family = AF_INET;
  servaddr.sin_addr.s_addr = inet_addr(ip);
  servaddr.sin_port = htons(port);
  test = connect(sockfd, (struct sockaddr_in *)&servaddr, sizeof(servaddr));
  if(test == -1){
    close(sockfd);
    return CLOSED;
  }
  close(sockfd);
  return OPEN;
}