mirror of
https://github.com/riba2534/TCP-IP-NetworkNote.git
synced 2026-02-03 01:53:19 +08:00
96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <arpa/inet.h>
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#include <sys/socket.h>
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#include <sys/epoll.h>
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#define BUF_SIZE 100
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#define EPOLL_SIZE 50
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void error_handling(char *message);
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int main(int argc, char *argv[])
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{
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int serv_sock, clnt_sock;
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struct sockaddr_in serv_adr, clnt_adr;
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socklen_t adr_sz;
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int str_len, i;
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char buf[BUF_SIZE];
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struct epoll_event *ep_events;
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struct epoll_event event;
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int epfd, event_cnt;
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if (argc != 2)
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{
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printf("Usage : %s <port> \n", argv[0]);
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exit(1);
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}
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serv_sock = socket(PF_INET, SOCK_STREAM, 0);
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memset(&serv_adr, 0, sizeof(serv_adr));
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serv_adr.sin_family = AF_INET;
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serv_adr.sin_addr.s_addr = htonl(INADDR_ANY);
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serv_adr.sin_port = htons(atoi(argv[1]));
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if (bind(serv_sock, (struct sockaddr *)&serv_adr, sizeof(serv_adr)) == -1)
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error_handling("bind() error");
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if (listen(serv_sock, 5) == -1)
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error_handling("listen() error");
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epfd = epoll_create(EPOLL_SIZE); //可以忽略这个参数，填入的参数为操作系统参考
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ep_events = malloc(sizeof(struct epoll_event) * EPOLL_SIZE);
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event.events = EPOLLIN; //需要读取数据的情况
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event.data.fd = serv_sock;
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epoll_ctl(epfd, EPOLL_CTL_ADD, serv_sock, &event); //例程epfd 中添加文件描述符 serv_sock，目的是监听 enevt 中的事件
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while (1)
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{
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event_cnt = epoll_wait(epfd, ep_events, EPOLL_SIZE, -1); //获取改变了的文件描述符，返回数量
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if (event_cnt == -1)
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{
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puts("epoll_wait() error");
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break;
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}
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for (i = 0; i < event_cnt; i++)
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{
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if (ep_events[i].data.fd == serv_sock) //客户端请求连接时
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{
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adr_sz = sizeof(clnt_adr);
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clnt_sock = accept(serv_sock, (struct sockaddr *)&clnt_adr, &adr_sz);
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event.events = EPOLLIN;
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event.data.fd = clnt_sock; //把客户端套接字添加进去
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epoll_ctl(epfd, EPOLL_CTL_ADD, clnt_sock, &event);
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printf("connected client : %d \n", clnt_sock);
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}
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else //是客户端套接字时
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{
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str_len = read(ep_events[i].data.fd, buf, BUF_SIZE);
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if (str_len == 0)
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{
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epoll_ctl(epfd, EPOLL_CTL_DEL, ep_events[i].data.fd, NULL); //从epoll中删除套接字
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close(ep_events[i].data.fd);
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printf("closed client : %d \n", ep_events[i].data.fd);
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}
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else
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{
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write(ep_events[i].data.fd, buf, str_len);
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}
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}
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}
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}
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close(serv_sock);
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close(epfd);
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return 0;
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}
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void error_handling(char *message)
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{
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fputs(message, stderr);
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fputc('\n', stderr);
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exit(1);
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}
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