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如何编写C语言TCP服务器端代码？

admin
行业动态
2025-01-18
3

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python，import socket，，def start_server(host='127.0.0.1', port=8080):， with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:， s.bind((host, port))， s.listen()， print(f"Server started at {host}:{port}")， conn, addr = s.accept()， with conn:， print(f"Connected by {addr}")， while True:， data = conn.recv(1024)， if not data:， break， conn.sendall(data)，，start_server()，

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在构建一个基本的TCP服务器端程序时，我们通常使用套接字编程，以下是一个简单的C语言实现的TCP服务器代码示例，它能够接受客户端连接并回传接收到的消息。

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h> 
#include <sys/socket.h>
#include <netinet/in.h>
void error(const char *msg) {
    perror(msg);
    exit(1);
}
int main(int argc, char *argv[]) {
    int sockfd, newsockfd, portno;
    socklen_t clilen;
    char buffer[256];
    struct sockaddr_in serv_addr, cli_addr;
    int n;
    if (argc < 2) {
        fprintf(stderr,"ERROR, no port provided
");
        exit(1);
    }
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd < 0) 
       error("ERROR opening socket");
    bzero((char *) &serv_addr, sizeof(serv_addr));
    portno = atoi(argv[1]);
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_addr.s_addr = INADDR_ANY;
    serv_addr.sin_port = htons(portno);
    if (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) 
              error("ERROR on binding");
              
    listen(sockfd,5);
    clilen = sizeof(cli_addr);
    newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &clilen);
    if (newsockfd < 0) 
          error("ERROR on accept");
    bzero(buffer,256);
    n = read(newsockfd,buffer,255);
    if (n < 0) error("ERROR reading from socket");
    printf("Here is the message: %s
",buffer);
    n = write(newsockfd,buffer,strlen(buffer));
    if (n < 0) error("ERROR writing to socket");
    close(newsockfd);
    close(sockfd);
    return 0; 
}