#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <malloc.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/ioctl.h>
#include <stdarg.h>
#include <fcntl.h>
#include <time.h>
int main(int argc, char *argv[]) // 注意輸入參數, 帶上ip和port
{
  int sockClient = socket(AF_INET, SOCK_STREAM, 0);
  struct sockaddr_in addrSrv;
  addrSrv.sin_addr.s_addr = inet_addr(argv[1]);
  addrSrv.sin_family = AF_INET;
  addrSrv.sin_port = htons(atoi(argv[2]));
 fcntl(sockClient, F_SETFL, fcntl(sockClient, F_GETFL, 0)|O_NONBLOCK); 
  int iRet = connect(sockClient, ( const struct sockaddr *)&addrSrv, sizeof(struct sockaddr_in));
 printf("connect iRet is %d, errmsg:%s\n", iRet, strerror(errno)); // 返回-1不一定是異常
 if (iRet != 0) 
 { 
   if(errno != EINPROGRESS)
 {
  printf("connect error:%s\n", strerror(errno)); 
 }
   else 
 {
  struct timeval tm = {5, 0}; 
  fd_set wset, rset; 
  FD_ZERO(&wset); 
  FD_ZERO(&rset); 
  FD_SET(sockClient, &wset); 
  FD_SET(sockClient, &rset); 
  int time1 = time(NULL);
  int n = select(sockClient + 1, &rset, &wset, NULL, &tm); 
  int time2 = time(NULL);
  printf("time gap is %d\n", time2 - time1);
  if(n < 0) 
  { 
   printf("select error, n is %d\n", n); 
  } 
  else if(n == 0) 
  { 
   printf("connect time out\n"); 
  } 
  else if (n == 1) 
  {
   if(FD_ISSET(sockClient, &wset)) 
   { 
    printf("connect ok!\n"); 
    fcntl(sockClient, F_SETFL, fcntl(sockClient, F_GETFL, 0) & ~O_NONBLOCK); 
   } 
   else 
   { 
    printf("unknow error:%s\n", strerror(errno)); 
   } 
  }
  else
  {
  printf("oh, not care now, n is %d\n", n);
  }
 } 
 } 
 printf("I am here!\n");
  getchar();
  close(sockClient);
  return 0;
}