拿来即用的Linux上TCP服务端程序

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h> 
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
int main(void)
{
    //初始化套接字
    int listenfd = socket(AF_INET, SOCK_STREAM, 0);
    if (listenfd < 0)
    {
        perror("socket");
        return -1;
    }
    struct sockaddr_in address;
    bzero(&address, sizeof(address));
    address.sin_family = AF_INET;
    address.sin_addr.s_addr = htonl(INADDR_ANY);
    address.sin_port = htons(8080);
    int ret = bind(listenfd, (struct sockaddr *)&address, sizeof(address));
    if (ret < 0)
    {
        perror("bind");
        return -1;
    }
    ret = listen(listenfd, 5);
    if (ret < 0)
    {
        perror("listen");
        return -1;
    }
    struct sockaddr_in client_address;
    socklen_t client_addrlength = sizeof(client_address);
    int connfd = accept(listenfd, (struct sockaddr *)&client_address, &client_addrlength);
    if (connfd < 0)
    {
        perror("accept");
    }
    printf("The connection is successful : %d\n", connfd);
    char buf[1024];
    ret = recv(connfd, buf, sizeof(buf) - 1, 0);
    if (ret <= 0) {
        perror("recv");
    }
    printf("recv: %s", buf);
    close(connfd);
    close(listenfd);
    return 0;
}