// 服务器端 server.c
#include <unistd.h>
#include <sys/types.h> /* basic system data types */
#include <sys/socket.h> /* basic socket definitions */
#include <netinet/in.h> /* sockaddr_in{} and other Internet defns */
#include <arpa/inet.h> /* inet(3) functions */
#include <sys/epoll.h> /* epoll function */
#include <fcntl.h> /* nonblocking */
#include <sys/resource.h> /*setrlimit */
#include <stdlib.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <signal.h>
#define PORT 6888
#define MAXCLIENT 1000
#define MAXEPOLLSIZE 10000
#define MAXLINE 10240
int handle(int connfd);
int setnonblocking(int sockfd)
{
if (fcntl(sockfd, F_SETFL, fcntl(sockfd, F_GETFD, 0)|O_NONBLOCK) == -1) {
return -1;
}
return 0;
}
int main(int argc, char **argv)
{
int listenq = 1024;
int listenport = PORT;
int listenfd, connfd, kdpfd, nfds, n, nread, curfds,acceptCount = 0;
struct sockaddr_in servaddr, cliaddr;
socklen_t socklen = sizeof(struct sockaddr_in);
struct epoll_event ev;
struct epoll_event events[MAXCLIENT];
struct rlimit rt;
char buf[MAXLINE];
if (argc == 2) {
listenport = atoi(argv[1]);
}
/* 设置每个进程允许打开的最大文件数 */
rt.rlim_max = rt.rlim_cur = MAXEPOLLSIZE;
if (setrlimit(RLIMIT_NOFILE, &rt) == -1)
{
perror("setrlimit error");
return -1;
}
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl (INADDR_ANY);
servaddr.sin_port = htons (listenport);
listenfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (listenfd == -1) {
perror("can't create socket file");
return -1;
}
int opt = 1;
setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
signal(SIGPIPE,SIG_IGN);
if (setnonblocking(listenfd) < 0) {
perror("setnonblock error");
}
if (bind(listenfd, (struct sockaddr *) &servaddr, sizeof(struct sockaddr)) == -1)
{
perror("bind error");
return -1;
}
if (listen(listenfd, MAXCLIENT) == -1)
{
perror("listen error");
return -1;
}
/* 创建 epoll 句柄，把监听 socket 加入到 epoll 集合里 */
kdpfd = epoll_create(MAXCLIENT);
ev.events = EPOLLIN | EPOLLET;
ev.data.fd = listenfd;
if (epoll_ctl(kdpfd, EPOLL_CTL_ADD, listenfd, &ev) < 0)
{
fprintf(stderr, "epoll set insertion error: fd=%d
", listenfd);
return -1;
}
curfds = 1;
printf("epollserver startup,port %d, max connection is %d, backlog is %d
", listenport, MAXCLIENT, listenq);
for (;;) {
/* 等待有事件发生 */
nfds = epoll_wait(kdpfd, events, curfds, -1);
if (nfds == -1)
{
perror("epoll_wait");
continue;
}
/* 处理所有事件 */
for (n = 0; n < nfds; ++n)
{
if (events[n].data.fd == listenfd)
{
connfd = accept(listenfd, (struct sockaddr *)&cliaddr,&socklen);
if (connfd < 0)
{
perror("accept error");
continue;
}
sprintf(buf, "accept form %s:%d
", inet_ntoa(cliaddr.sin_addr), cliaddr.sin_port);
printf("%d:%s", ++acceptCount, buf);
if (curfds > MAXCLIENT) {
fprintf(stderr, "too many connection, more than %d
", MAXCLIENT);
close(connfd);
continue;
}
if (setnonblocking(connfd) < 0) {
perror("setnonblocking error");
}
ev.events = EPOLLIN | EPOLLET;
ev.data.fd = connfd;
if (epoll_ctl(kdpfd, EPOLL_CTL_ADD, connfd, &ev) < 0)
{
fprintf(stderr, "add socket '%d' to epoll failed: %s
", connfd, strerror(errno));
return -1;
}
curfds++;
continue;
}
// 处理客户端请求
if (handle(events[n].data.fd) < 0) {
epoll_ctl(kdpfd, EPOLL_CTL_DEL, events[n].data.fd,&ev);
curfds--;
}
}
}
close(listenfd);
return 0;
}
int handle(int connfd) {
int nread;
char buf[MAXLINE];
memset(buf,0,sizeof(buf));
nread = read(connfd, buf, MAXLINE);//读取客户端socket流
struct sockaddr_in serv,guest;
char serv_ip[20];
char guest_ip[20];
socklen_t serv_len = sizeof(serv);
socklen_t guest_len = sizeof(guest);
getsockname(connfd, (struct sockaddr *)&serv, &serv_len);
getpeername(connfd, (struct sockaddr *)&guest, &guest_len);
inet_ntop(AF_INET, &serv.sin_addr, serv_ip, sizeof(serv_ip));
inet_ntop(AF_INET, &guest.sin_addr, guest_ip, sizeof(guest_ip));
printf("guest %s:%d ",guest_ip, ntohs(guest.sin_port));
if (nread == 0) {
printf("client close the connection
");
close(connfd);
return -1;
}
if (nread < 0) {
perror("read error");
close(connfd);
return -1;
}
printf(">> %s",buf);
fflush(stdout);
write(connfd, buf, nread);//响应客户端
return 0;
}
#include <unistd.h>
#include <sys/types.h> /* basic system data types */
#include <sys/socket.h> /* basic socket definitions */
#include <netinet/in.h> /* sockaddr_in{} and other Internet defns */
#include <arpa/inet.h> /* inet(3) functions */
#include <netdb.h> /*gethostbyname function */
#include <stdlib.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#define MAXLINE 1024
void handle(int connfd);
int main(int argc, char **argv)
{
char * servInetAddr = "127.0.0.1";
int servPort = 6888;
char buf[MAXLINE];
int connfd;
struct sockaddr_in servaddr;
if (argc == 2) {
servInetAddr = argv[1];
}
if (argc == 3) {
servInetAddr = argv[1];
servPort = atoi(argv[2]);
}
if (argc > 3) {
printf("usage: echoclient <IPaddress> <Port>
");
return -1;
}
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) {
perror("connect error");
return -1;
}
printf("welcome to echoclient
");
handle(connfd); /* do it all */
close(connfd);
printf("exit
");
exit(0);
}
void handle(int sockfd)
{
char sendline[MAXLINE], recvline[MAXLINE];
int n;
for (;;) {
if (fgets(sendline, MAXLINE, stdin) == NULL) {
break;//read eof
}
/*
//也可以不用标准库的缓冲流,直接使用系统函数无缓存操作
if (read(STDIN_FILENO, sendline, MAXLINE) == 0) {
break;//read eof
}
*/
n = write(sockfd, sendline, strlen(sendline));
n = read(sockfd, recvline, MAXLINE);
if (n == 0) {
printf("echoclient: server terminated prematurely
");
break;
}
write(STDOUT_FILENO, recvline, n);
//如果用标准库的缓存流输出有时会出现问题
//fputs(recvline, stdout);
}
}