client.c

#include "hl.h"
int main (void)
{
    int fd = -1;
    struct sockaddr_in sin;
    /* 1. 创建socket fd */
    if ((fd = socket (AF_INET, SOCK_STREAM, 0)) < 0) {
        perror ("socket");
        exit (1);
    }
    /*2.连接服务器 */
    /*2.1 填充struct sockaddr_in结构体变量 */
    bzero (&sin, sizeof (sin));
    sin.sin_family = AF_INET;
    sin.sin_port = htons (SERV_PORT);    //网络字节序的端口号
#if 0
    sin.sin_addr.s_addr = inet_addr (SERV_IP_ADDR);
#else
    if (inet_pton (AF_INET, SERV_IP_ADDR, (void *) &sin.sin_addr) != 1) {
        perror ("inet_pton");
        exit (1);
    }
#endif
    if (connect (fd, (struct sockaddr *) &sin, sizeof (sin)) < 0) {
        perror ("connect");
        exit (1);
    }
    printf ("Client staring...OK!\n");
    /*3. 读写数据 */
    char buf[BUFSIZ];
    int ret = -1;
    while (1) {
        bzero (buf, BUFSIZ);
        if (fgets (buf, BUFSIZ - 1, stdin) == NULL) {
            continue;
        }
        do {
            ret = write (fd, buf, strlen (buf));
        } while (ret < 0 && EINTR == errno);
        if (!strncasecmp (buf, QUIT_STR, strlen (QUIT_STR))) {    //用户输入了quit字符
            printf ("Client is exiting!\n");
            break;
        }
    }
    /*4.关闭套接字 */
    close (fd);
}