epoll例程 簡單的server和client

客戶端從標準輸入讀入一行，傳送到服務端

服務端從網路讀取一行，然後輸出到客戶端

客戶端收到服務端的響應，輸出這一行到標準輸出

**如下:

#include  #include  /*

basic system data types 
*/#include  /*
basic socket definitions 
*/#include  in.h>      /*
sockaddr_in{} and other internet defns 
*/#include  /*
inet(3) functions 
*/#include /*
epoll function 
*/#include /*
nonblocking 
*/#include /*
setrlimit 
*/#include #include #include #include 
#define maxepollsize 10000
#define maxline 10240
int handle(int connfd);
int setnonblocking(int sockfd)
return0;}
int main(int argc, char **argv)
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = af_inet; 
servaddr.sin_addr.s_addr = htonl (inaddr_any);
servaddr.sin_port = htons (servport);
listenfd = socket(af_inet, sock_stream, 0); 
if (listenfd == -1) 
int opt = 1;
setsockopt(listenfd, sol_socket, so_reuseaddr, &opt, sizeof(opt));
if (setnonblocking(listenfd) < 0) 
if (bind(listenfd, (struct sockaddr *) &servaddr, sizeof(struct sockaddr)) == -1) 
if (listen(listenfd, listenq) == -1) 
/*建立 epoll 控制代碼，把監聽 socket 加入到 epoll 集合裡 
*/    kdpfd = epoll_create(maxepollsize);
ev.events = epollin | epollet;
ev.data.fd = listenfd;
if (epoll_ctl(kdpfd, epoll_ctl_add, listenfd, &ev) < 0) 
curfds = 1;
printf("
epollserver startup,port %d, max connection is %d, backlog is %d\n
", servport, maxepollsize, listenq);
for (;;) 
/*處理所有事件 
*/for (n = 0; n < nfds; ++n)
sprintf(buf, "
accept form %s:%d\n
", inet_ntoa(cliaddr.sin_addr), cliaddr.sin_port);
printf("
%d:%s
", ++acceptcount, buf);
if (curfds >= maxepollsize)  
if (setnonblocking(connfd) < 0) 
ev.events = epollin | epollet;
ev.data.fd = connfd;
if (epoll_ctl(kdpfd, epoll_ctl_add, connfd, &ev) < 0)
curfds++;
continue;
} //
處理客戶端請求
if (handle(events[n].data.fd) < 0) }}
close(listenfd);
return0;}
int handle(int connfd)  
if (nread < 0)     
write(connfd, buf, nread);//
響應客戶端  
return
0;}

#include  #include  /*

basic system data types 
*/#include  /*
basic socket definitions 
*/#include  in.h>      /*
sockaddr_in{} and other internet defns 
*/#include  /*
inet(3) functions 
*/#include /*
gethostbyname function 
*/#include #include #include #include 
#define maxline 1024
void handle(int connfd);
int main(int argc, char **argv)
if (argc == 3) 
if (argc > 3) 
connfd = socket(af_inet, sock_stream, 0);
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = af_inet;
servaddr.sin_port = htons(servport);
inet_pton(af_inet, servinetaddr, &servaddr.sin_addr);
if (connect(connfd, (struct sockaddr *) &servaddr, sizeof(servaddr)) < 0) 
printf("
welcome to echoclient\n
");    handle(connfd);     /*
do it all 
*/    close(connfd);
printf("
exit\n
");    exit(0);
}void handle(int sockfd)
/*//也可以不用標準庫的緩衝流,直接使用系統函式無快取操作
if (read(stdin_fileno, sendline, maxline) == 0) 
*/        n = write(sockfd, sendline, strlen(sendline));
n = read(sockfd, recvline, maxline);
if (n == 0) 
write(stdout_fileno, recvline, n);
//如果用標準庫的快取流輸出有時會出現問題
//fputs(recvline, stdout);}}

gcc echoserver.c -o echoserver

./echoserver

gcc echoclient.c -o echoclient

./echoclient

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