p12-16.c

来自「SUN Solaris8平台下进程间通信」· C语言 代码 · 共 30 行

#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>
#include "err_exit.h"
int main(void)
{
    int sockfd;
    socklen_t  len;
    struct sockaddr_in addr,raddr;
    /* 创建套接字 */
    sockfd = socket (AF_INET, SOCK_STREAM, 0);
    if (sockfd < 0)
        err_exit("socket");
    /* 命名该套接字 */
    addr.sin_family = AF_INET;
    addr.sin_port = htons(0);
    addr.sin_addr.s_addr = htonl(INADDR_ANY);
    if (bind (sockfd, (struct sockaddr *)&addr, sizeof(addr)) < 0)
        err_exit("bind");
    /* 查看套接字相连的名字和端口号 */
    len = sizeof(raddr);
    if (getsockname(sockfd, (struct sockaddr*)&raddr, &len) < 0)
        err_exit("getsockname ");
    printf("bound name = %s, port = %d\n", 
            ntohl(raddr.sin_addr.s_addr), ntohs(raddr.sin_port));
    exit(0);
}