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epoll_service.c
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epoll_service.c
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <errno.h>
#include <signal.h>
#include <sys/wait.h>
#include <sys/select.h>
#include <string.h>
#include <sys/epoll.h>
#define EXIT(msg) do{ \
perror(msg); \
exit(-1); \
}while(0)
#define EPOLL_MAX 1024
// socket
int Socket(int protocol)
{
int sockfd;
if((sockfd = socket(AF_INET, SOCK_STREAM, protocol)) < 0)
EXIT("socket");
return sockfd;
}
// bind
int Bind(int sockfd, int port, const char *addr)
{
struct sockaddr_in sockaddr;
sockaddr.sin_addr.s_addr = inet_addr(addr);
sockaddr.sin_port = htons(port);
sockaddr.sin_family = AF_INET;
if(bind(sockfd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)) != 0)
{
if(errno == EADDRINUSE)
fprintf(stderr, "addr %s erro\n", inet_ntoa(sockaddr.sin_addr));
else if(errno == EINVAL)
fprintf(stderr, "port %d error\n", ntohs(sockaddr.sin_port));
EXIT("bind");
}
return 0;
}
// connect
int Connect(int sockfd, int port, const char *addr)
{
struct sockaddr_in sockaddr;
sockaddr.sin_port = htons(port);
sockaddr.sin_family = AF_INET;
sockaddr.sin_addr.s_addr = inet_addr(addr);
if(connect(sockfd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)) != 0)
EXIT("connect");
return 0;
}
// accept
int Accept(int servicefd, struct sockaddr_in *client_addr, socklen_t *client_len)
{
int clientfd;
while(1)
{
clientfd = accept(servicefd, (struct sockaddr *)client_addr, client_len);
// accept被信号打断后重新运行
if(clientfd < 0)
{
if(errno == EINTR)
continue;
else
EXIT("accept");
}
break;
}
return clientfd;
}
void doService(int servicefd)
{
int clientfd, epfd;
char buf[1024];
struct epoll_event event, evts[EPOLL_MAX];
event.events = EPOLLIN;
event.data.fd = servicefd;
epfd = epoll_create(1);
epoll_ctl(epfd, EPOLL_CTL_ADD, servicefd, &event);
int n, eventNum;
while(1)
{
// 这里设置的永久阻塞
eventNum = epoll_wait(epfd, evts, EPOLL_MAX, -1);
if(eventNum == 0)
continue;
else if(eventNum < 0)
EXIT("epoll_wait");
// 遍历多少个描述符状态改变
for(int i = 0; i < eventNum; i++)
{
if(evts[i].data.fd == servicefd && (evts[i].events &EPOLLIN))
{
clientfd = Accept(servicefd, NULL, NULL);
event.events = EPOLLIN;
event.data.fd = clientfd;
epoll_ctl(epfd, EPOLL_CTL_ADD, clientfd, &event);
}
else if(evts[i].events & EPOLLIN)
{
n = recv(evts[i].data.fd, buf, sizeof(buf), 0);
if(n <= 0)
{
// 清除关闭的套接字
epoll_ctl(epfd, EPOLL_CTL_DEL, evts[i].data.fd, NULL);
close(evts[i].data.fd);
fprintf(stderr, "peer close\n");
}
send(evts[i].data.fd, buf, n, 0);
}
}
}
}
// 服务端
int service(int port, const char *ser_addr)
{
int sockfd;
sockfd = Socket(0);
Bind(sockfd, port, ser_addr);
listen(sockfd, 1);
doService(sockfd);
return 0;
}
// 客户端
int client(int port, const char *cli_addr)
{
int sockfd;
sockfd = Socket(0);
Connect(sockfd, port, cli_addr);
char buf[1024];
int n;
int stat = 0;
fd_set rfds, testrfds;
FD_ZERO(&rfds);
FD_SET(STDIN_FILENO, &rfds);
FD_SET(sockfd, &rfds);
while(1)
{
testrfds = rfds;
select(sockfd + 1, &testrfds, NULL, NULL, NULL);
if(FD_ISSET(STDIN_FILENO, &testrfds))
{
n = read(STDIN_FILENO, buf, sizeof(buf));
if(n == 0){
shutdown(sockfd, SHUT_WR);
stat = 1;
FD_CLR(STDIN_FILENO, &rfds);
continue;
}
send(sockfd, &buf, n, 0);
}
if(FD_ISSET(sockfd, &testrfds))
{
n = recv(sockfd, buf, sizeof(buf), 0);
if(n == 0){
if(stat == 1)
break;
else
exit(1);
}
write(STDOUT_FILENO, buf, n);
}
}
close(sockfd);
return 0;
}
// 输入 1(服务端)或者2(客户端) 端口号 本机IP地址
int main(int argc, char *argv[])
{
if(argc != 4)
exit(-1);
int i = atoi(argv[1]);
if(i == 1)
service(atoi(argv[2]), argv[3]);
if(2 == i)
client(atoi(argv[2]), argv[3]);
exit(EXIT_SUCCESS);
}