c
复制代码
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdlib.h>
#include <arpa/inet.h>
#include <sys/select.h>
#include <sys/time.h>
#include <unistd.h>
#define MAX_CLI 50
int clients[MAX_CLI];
struct sockaddr_in clientaddr;
socklen_t len = sizeof(clientaddr);
int socket_create(int port) {//创建并绑定网络监听的socket套接字
int fd;
if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
perror("socket");
exit(EXIT_FAILURE);
}
struct sockaddr_in addr;
bzero(&addr, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = INADDR_ANY;
addr.sin_port = htons(port);
if (bind(fd, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
perror("bind");
exit(EXIT_FAILURE);
}
if (listen(fd, 20) < 0) {
perror("listen");
exit(EXIT_FAILURE);
}
return fd;
}
int recv_msg(int fd, char *buff, int size) {
int rsize = recv(fd, buff, sizeof(char ) * size, 0);
if (rsize <= 0) {
return -1;
}
printf("Recv : %s\n", buff);
return 0;
}
int send_msg(int fd, char *buff, int size) {
int ssize = send(fd, buff, sizeof(char ) * size, 0);
if (ssize <= 0) {
return -1;
}
printf("Send success!\n");
return 0;
}
void echo_work(int server_listen) {
for (int i = 0; i < MAX_CLI; i++) clients[i] = -1;//初始化数组
while (1) {
fd_set rfds;
FD_ZERO(&rfds);
FD_SET(server_listen, &rfds);
int max_fd = server_listen;
for (int i = 0; i < MAX_CLI; i++) {
int fd = clients[i];
if (fd != -1) {
FD_SET(fd, &rfds);
max_fd = fd > max_fd ? fd : max_fd;
}
}
int ret = select(max_fd + 1, &rfds, NULL, NULL, NULL);
if (ret < 0) {
perror("select");
exit(EXIT_FAILURE);
}
if (FD_ISSET(server_listen, &rfds)) {
int clientfd;
if((clientfd = accept(server_listen, (struct sockaddr *)&clientaddr, &len)) < 0) {
perror("accept");
exit(EXIT_FAILURE);
}
printf("one client accpet succes\n");
for (int i = 0; i < MAX_CLI; i++) {
if (clients[i] == -1) {
clients[i] = clientfd;
break;
}
}
}
for (int i = 0; i < MAX_CLI; i++) {
int fd = clients[i];
if (fd != -1 && FD_ISSET(fd, &rfds)) {
char buff[1024] = {0};
if (recv_msg(fd, buff, 1024) < 0) {
clients[i] = -1;
close(fd);
}//接收数据
if (send_msg(fd, buff, 1024) < 0) {
clients[i] = -1;
close(fd);
}//回显数据
}
}
}
return ;
}
int main() {
int server_listen;
if ((server_listen = socket_create(8080)) < 0) {
perror("socket_create");
exit(EXIT_FAILURE);
}
echo_work(server_listen);
return 0;
}