#include <stdio.h>

#include <string.h>

#include <sys/socket.h>

#include <netinet/in.h>

int main(int argc, char**argv)

{

    int listenfd,connfd,n, ret;

    struct sockaddr_in servaddr, cliaddr;

    socklen_t clilen;

    pid_t     childpid;

    char mesg[1000], *peeraddr;

    listenfd = socket(AF_INET, SOCK_STREAM, 0);

    if (listenfd < 0) {

        printf("create socket error\n");

        return -1;

    }

    printf("create socket success\n");

    memset(&servaddr, 0, sizeof(servaddr));

    servaddr.sin_family = AF_INET;

    servaddr.sin_addr.s_addr = htonl(INADDR_ANY);

    servaddr.sin_port = htons(6789);

    ret = bind(listenfd, (struct sockaddr *)&servaddr, sizeof(servaddr));

    if (ret == -1) {

        printf("bind error\n");

        return -1;

    }

    printf("bind success\n");

    ret = listen(listenfd, 1024);

    if (ret == -1) {

        printf("listen error\n");

        return -1;

    }

    printf("listening...\n");

    for (;;) {

        clilen = sizeof(cliaddr);

        connfd = accept(listenfd, (struct sockaddr *)&cliaddr, &clilen);

        printf("Accept request from %s\n", inet_ntoa(cliaddr.sin_addr));

        n = read(connfd, mesg, 1000);

        if (n < 0) {

            printf("read error!\n");

        }

        printf("Received:%s\n", mesg);

        close(connfd);

    }

}

char *inet_ntoa(struct in_addr in);

       sa_family_t       sin_family;

       in_port_t         sin_port;

       struct in_addr    sin_addr;

       unsigned char     sin_zero[sizeof(struct sockaddr) - sizeof(sa_family_t) - sizeof(in_port_t), sizeof(struct in_addr)];

};