#include <stdio.h>

#include <stdlib.h>

#include <errno.h>

#include <string.h>

#include <sys/types.h>

#include <netinet/in.h>

#include <sys/socket.h>

#include <sys/wait.h>

#define MYPORT 3490                 /* 监听的端口 */

#define BACKLOG 10                 /* listen的请求接收队列长度 */

void main() {

int sockfd, new_fd;             /* 监听端口，数据端口 */

struct sockaddr_in sa;         /* 自身的地址信息 */

struct sockaddr_in their_addr; /* 连接对方的地址信息 */

int sin_size;

　

if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {

perror("socket");

exit(1);

}

sa.sin_family = AF_INET;

sa.sin_port = htons(MYPORT);         /* 网络字节顺序 */

sa.sin_addr.s_addr = INADDR_ANY;     /* 自动填本机IP */

bzero(&(sa.sin_zero), 8);             /* 其余部分置0 */

if (bind(sockfd, (struct sockaddr *)&sa, sizeof(sa)) == -1) {

perror("bind");

exit(1);

}

if (listen(sockfd, BACKLOG) == -1) {

perror("listen");

exit(1);

}

　

/* 主循环 */

while(1) {

sin_size = sizeof(struct sockaddr_in);

new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size))

if (new_fd == -1) {

perror("accept");

continue;

}

printf(”Got connection from %s\n", inet_ntoa(their_addr.sin_addr));

if (fork() == 0) {

/* 子进程 */

if (send(new_fd, "Hello, world!\ n", 14, 0) == -1)

perror("send");

close(new_fd);

exit(0);

}

close(new_fd);

/*清除所有子进程 */

while(waitpid(-1,NULL,WNOHANG) > 0);

}

}