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;
    13.     int port = -1;
    14.     struct sockaddr_in sin;
    16.     if(argc != 3)
    17.     {
    18.         usage(argv[0]);
    19.         exit(1);
    20.     }
    22.     /* 1. 创建socket fd */
    23.     if ((fd = socket (AF_INET, SOCK_STREAM, 0)) < 0) {
    24.         perror ("socket");
    25.         exit (1);
    26.     }
    27.     /*2.连接服务器 */
    28.     port = atoi(argv[2]);
    29.     if(port < 5000)
    30.     {
    31.         usage(argv[0]);
    32.         exit(1);
    33.     }
    35.     /*2.1 填充struct sockaddr_in结构体变量 */
    36.     bzero (&sin, sizeof (sin));
    38.     sin.sin_family = AF_INET;
    39.     sin.sin_port = htons (SERV_PORT);    //网络字节序的端口号
    40. #if 0
    41.     sin.sin_addr.s_addr = inet_addr (SERV_IP_ADDR);
    42. #else
    43.     if (inet_pton (AF_INET, SERV_IP_ADDR, (void *) &sin.sin_addr) != 1) {
    44.         perror ("inet_pton");
    45.         exit (1);
    46.     }
    47. #endif
    49.     if (connect (fd, (struct sockaddr *) &sin, sizeof (sin)) < 0) {
    50.         perror ("connect");
    51.         exit (1);
    52.     }
    54.     printf ("Client staring...OK!\n");
    55.     /*3. 读写数据 */
    56.     char buf[BUFSIZ];
    57.     int ret = -1;
    58.     while (1) {
    59.         bzero (buf, BUFSIZ);
    60.         if (fgets (buf, BUFSIZ - 1, stdin) == NULL) {
    61.             continue;
    62.         }
    63.         do {
    64.             ret = write (fd, buf, strlen (buf));
    65.         } while (ret < 0 && EINTR == errno);
    67.         if (!strncasecmp (buf, QUIT_STR, strlen (QUIT_STR))) {    //用户输入了quit字符
    68.             printf ("Client is exiting!\n");
    69.             break;
    70.         }
    71.     }
    73.     /*4.关闭套接字 */
    74.     close (fd);
    75. }