1. #include "hl.h"
    3. void usage (char *s)
    4. {
    5.     printf ("\n%s serv_ip serv_port", s);
    6.     printf ("\n\t serv_ip: server ip address");
    7.     printf ("\n\t serv_port: server port(>5000)\n\n");
    8. }
    10. int main (int argc, char **argv)
    11. {
    12.     int fd = -1;
    14.     int port = -1;
    15.     struct sockaddr_in sin;
    17.     if (argc != 3) {
    18.         usage (argv[0]);
    19.         exit (1);
    20.     }
    21.     /* 1. 创建socket fd */
    22.     if ((fd = socket (AF_INET, SOCK_STREAM, 0)) < 0) {
    23.         perror ("socket");
    24.         exit (1);
    25.     }
    27.     port = atoi (argv[2]);
    28.     if (port < 5000) {
    29.         usage (argv[0]);
    30.         exit (1);
    31.     }
    32.     /*2.连接服务器 */
    34.     /*2.1 填充struct sockaddr_in结构体变量 */
    35.     bzero (&sin, sizeof (sin));
    37.     sin.sin_family = AF_INET;
    38.     sin.sin_port = htons (port);    //网络字节序的端口号
    39.     if (inet_pton (AF_INET, argv[1], (void *) &sin.sin_addr) != 1) {
    40.         perror ("inet_pton");
    41.         exit (1);
    42.     }
    44.     if (connect (fd, (struct sockaddr *) &sin, sizeof (sin)) < 0) {
    45.         perror ("connect");
    46.         exit (1);
    47.     }
    49.     printf ("Client staring...OK!\n");
    51.     int ret = -1;
    52.     fd_set rset;
    53.     int maxfd = -1;
    54.     struct timeval tout;
    55.     char buf[BUFSIZ];
    57.     while (1) {
    58.         FD_ZERO (&rset);
    59.         FD_SET (0, &rset);
    60.         FD_SET (fd, &rset);
    61.         maxfd = fd;
    63.         tout.tv_sec = 5;
    64.         tout.tv_usec = 0;
    66.         select (maxfd + 1, &rset, NULL, NULL, &tout);
    67.         if (FD_ISSET (0, &rset)) {
    68.             bzero (buf, BUFSIZ);
    69.             do {
    70.                 ret = read (0, buf, BUFSIZ - 1);
    71.             } while (ret < 0 && EINTR == errno);
    72.             if (ret < 0) {
    73.                 perror ("read");
    74.                 continue;
    75.             }
    76.             if (!ret)
    77.                 continue;
    79.             if (write (fd, buf, strlen (buf)) < 0) {
    80.                 perror ("write() to socket");
    81.                 continue;
    82.             }
    84.             if (!strncasecmp (buf, QUIT_STR, strlen (QUIT_STR))) {    //用户输入了quit字符
    85.                 printf ("Client is exiting!\n");
    86.                 break;
    87.             }
    88.         }
    90.         if (FD_ISSET (fd, &rset)) {    
    91.             bzero (buf, BUFSIZ);
    92.             do {
    93.                 ret = read (fd, buf, BUFSIZ - 1);
    94.             } while (ret < 0 && EINTR == errno);
    95.             if (ret < 0) {
    96.                 perror ("read from socket");
    97.                 continue;
    98.             }
    99.             if (!ret)
    100.                 break;            /* 服务器关闭 */
    102.             printf ("server said: %s\n", buf);
    103.             if ((strlen(buf) > strlen(SERV_RESP_STR)) && !strncasecmp (buf+strlen(SERV_RESP_STR), QUIT_STR, strlen (QUIT_STR))) {    //用户输入了quit字符
    104.                 printf ("Sender Client is exiting!\n");
    105.                 break;
    106.             }
    108.         }
    109.     }
    111.     /*4.关闭套接字 */
    112.     close (fd);
    113. }