#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <signal.h>
int client(int connfd)//connfd;
{
int ret;
char buf[256];
while(1) {
memset(buf, 0, sizeof(buf));
ret = read(connfd, buf, sizeof(buf));
if (ret == -1) {
perror("server->read");
return -1;
} else if (ret == 0) {
return -1;
}
printf("buf : %s\n", buf);
ret = write(connfd, buf, sizeof(buf));
if (ret == -1) {
perror("server->write");
return -1;
}
}
return 0;
}
void fun(int sig)
{
printf("client quit\n");
while(waitpid(-1, NULL, WNOHANG) > 0);
}
int main(int argc, char *argv[])
{
int listenfd;
int ret;
socklen_t addrlen;
int connfd;
pid_t pid;
char buf[256];
struct sockaddr_in srvaddr;
struct sockaddr_in cltaddr;
pthread_t client_pthread;
signal(SIGCHLD, fun);
/* 1. 创建服务器（创建一socket套接字）；socket */
listenfd = socket(AF_INET, SOCK_STREAM, 0);
if (listenfd == -1) {
perror("server->socket");
return -1;
}
printf("create listenfd = %d success\n", listenfd);
/* 2. 设置服务器的IP地址和端口号（将socket和服务器的IP地址和端口号进行绑定）；bind */
memset(&srvaddr, 0, sizeof(struct sockaddr_in));
srvaddr.sin_family = AF_INET;
srvaddr.sin_port = htons(9999);
srvaddr.sin_addr.s_addr = inet_addr("192.168.2.100");
ret = bind(listenfd, (const struct sockaddr *)&srvaddr, sizeof(srvaddr));
printf("port : %d\n", ntohs(srvaddr.sin_port));
if (ret == -1) {
perror("server->bind");
return -1;
}
printf("bind success !\n");
/* 3. 启动监听（启动服务器）； listen */
ret = listen(listenfd, 1024);
if (ret == -1) {
perror("server->listen");
return -1;
}
printf("listen success !\n");
while(1) {
/* 4. 等待服务器的连接请求，如果没有连接请求则等待，如果有连接请求，则建立连接； accept */
memset(&cltaddr, 0, sizeof(cltaddr));
addrlen = sizeof(cltaddr);
connfd = accept(listenfd, (struct sockaddr *)&cltaddr, &addrlen);
if (connfd == -1) {
perror("server->accept");
return -1;
}
printf("connect connfd = %d\n", connfd);
printf("IP : %s\n", inet_ntoa(cltaddr.sin_addr));
printf("PORT: %d\n", ntohs(cltaddr.sin_port));
pid_t pid;
pid = fork();
if (pid == -1) {
perror("fork");
return -1;
} else if (pid == 0) {
close(listenfd);
client(connfd);
exit(0);
}
close(connfd);
}
close(listenfd);
return 0;
}
