测试SO_REUSEADDR与绑定

测试SO_REUSEADDR与绑定

示例代码1

//demo.cpp

#include <stdio.h>

#include <netdb.h>

#include <errno.h>

#include <string.h>

#include <unistd.h>

#include <linux/tcp.h>

int SockDemo()

{

    sockaddr_in in;

    memset(&in,'\0',sizeof(in));

    in.sin_family=AF_INET;

    in.sin_port=htons(12345);

    unsigned ip = 1234567;

    //in.sin_addr.s_addr=INADDR_ANY;

    in.sin_addr.s_addr=1234567;

    int reuse0=1;

    int serv=socket(AF_INET, SOCK_STREAM, 0);

    if (setsockopt(serv, SOL_SOCKET, SO_REUSEADDR, (char*)&reuse0, sizeof(reuse0))==-1)

    {

        return errno;

    }

    if (bind(serv, (sockaddr*)&in, sizeof(sockaddr)) == -1)

    //if (listen(serv, SOMAXCONN)==-1)

    //{

    //    return errno;

    //}

    int reuse1=1;

    int client=socket(AF_INET, SOCK_STREAM, 0);

    if (setsockopt(client, SOL_SOCKET, SO_REUSEADDR, (char *)&reuse1, sizeof(reuse1))==-1)

    //if (bind(client, (sockaddr*)&in, sizeof(sockaddr)) == -1)

    //sleep(10);

    close(client);

    close(serv);

    return 0;

}

int main(int argc, char *argv[])

    int errcode=SockDemo();

    printf("errno=%d, %s.\n", errcode, strerror(errcode));