Epoll 的tcp通信代码（服务器+客户端）

Epoll 的tcp通信代码（服务器+客户端）

/*
gcc -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -I${ORACLE_HOME}/rdbms/public -I${ORACLE_HOME}/rdbms/demo -L${ORACLE_HOME}/lib -lclntsh  -pthread -o epoll_server epoll_server.c
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <sys/epoll.h>
#include <sys/time.h>
#include <sys/resource.h>

#define MAXBUF 1024
#define MAXEPOLLSIZE 10000

/*
setnonblocking - 设置句柄为非阻塞方式
*/
int setnonblocking(int sockfd)
{
if (fcntl(sockfd, F_SETFL, fcntl(sockfd, F_GETFD, 0)|O_NONBLOCK) == -1) {
return -1;
}
return 0;
}

/*
handle_message - 处理每个 socket 上的消息收发
*/
int handle_message(int new_fd)
{
char buf[MAXBUF + 1];
char sendbuf[MAXBUF+1];
int len;
/* 开始处理每个新连接上的数据收发 */
bzero(buf, MAXBUF + 1);
/* 接收客户端的消息 */
len = recv(new_fd, buf, MAXBUF, 0);
if (len > 0){
printf("%d接收消息成功:'%s'，共%d个字节的数据/n",new_fd, buf, len);
}
else {
if (len < 0)
printf("消息接收失败！错误代码是%d，错误信息是'%s'/n",errno, strerror(errno));
else
printf("客户端%d退出!/n",new_fd);
return -1;
}
/* 处理每个新连接上的数据收发结束 */
return len;
}

int main(int argc, char **argv)
{
int listener, new_fd, nfds, n, ret;
struct epoll_event ev;
int kdpfd, curfds;
socklen_t len;
struct sockaddr_in my_addr, their_addr;
unsigned int myport, lisnum;
struct epoll_event events[MAXEPOLLSIZE];
struct rlimit rt;

if (argc>1)
myport = atoi(argv[1]);
else
myport = 1234;

if (argc>2)
lisnum = atoi(argv[2]);
else
lisnum = 10;

/* 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");
exit(1);
}
else printf("设置系统资源参数成功！/n");

/* 开启 socket 监听 */
if ((listener = socket(PF_INET, SOCK_STREAM, 0)) == -1) {
perror("socket");
exit(1);
} else
printf("socket 创建成功！/n");

/*设置socket属性，端口可以重用*/
int opt=SO_REUSEADDR;
setsockopt(listener,SOL_SOCKET,SO_REUSEADDR,&opt,sizeof(opt));

/*设置socket为非阻塞模式*/
setnonblocking(listener);

bzero(&my_addr, sizeof(my_addr));
my_addr.sin_family = PF_INET;
my_addr.sin_port = htons(myport);
if (argc>3)
my_addr.sin_addr.s_addr = inet_addr(argv[3]);
else
my_addr.sin_addr.s_addr = INADDR_ANY;

if (bind(listener, (struct sockaddr *) &my_addr, sizeof(struct sockaddr))== -1) {
perror("bind");
exit(1);
}
else
printf("IP 地址和端口绑定成功/n");

if (listen(listener, lisnum) == -1) {
perror("listen");
exit(1);
} else
printf("开启服务成功！/n");

/* 创建 epoll 句柄，把监听 socket 加入到 epoll 集合里 */
kdpfd = epoll_create(MAXEPOLLSIZE);
len = sizeof(struct sockaddr_in);
ev.events = EPOLLIN | EPOLLET;
ev.data.fd = listener;
if (epoll_ctl(kdpfd, EPOLL_CTL_ADD, listener, &ev) < 0) {
fprintf(stderr, "epoll set insertion error: fd=%d/n", listener);
return -1;
}
else
printf("监听 socket 加入 epoll 成功！/n");
curfds = 1;
while (1) {
/* 等待有事件发生 */
nfds = epoll_wait(kdpfd, events, curfds, -1);
if (nfds == -1) {
perror("epoll_wait");
break;
}
/* 处理所有事件 */
for (n = 0; n < nfds; ++n) {
if (events
.data.fd == listener) {
new_fd = accept(listener, (struct sockaddr *) &their_addr,
&len);
if (new_fd < 0) {
perror("accept");
continue;
else
printf("有连接来自于：%s:%d，分配的 socke为:%d/n",inet_ntoa(their_addr.sin_addr), ntohs(their_addr.sin_port), new_fd);

setnonblocking(new_fd);
ev.events = EPOLLIN | EPOLLET;
ev.data.fd = new_fd;
if (epoll_ctl(kdpfd, EPOLL_CTL_ADD, new_fd, &ev) < 0) {
fprintf(stderr, "把 socket '%d' 加入 epoll 失败！%s/n",
new_fd, strerror(errno));
return -1;
}
curfds++;
} else {
ret = handle_message(events
.data.fd);
if (ret < 1 && errno != 11) {
if(epoll_ctl(kdpfd, EPOLL_CTL_DEL, events
.data.fd,
&ev) < 0)
{
fprintf(stderr, "把 socket '%d' 从 epoll 删除失败！%s/n",
events
.data.fd, strerror(errno));
}
curfds--;
close(events
.data.fd);
}
}
}
}
close(listener);
return 0;
}

tcp客户端client.c:

#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <sys/select.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>

#define MAXLINE 1024
char sendhead[MAXLINE];

int main(int argc , char* argv[])
{
int sockfd;
struct sockaddr_in servaddr;
char *info="cxt";
int   maxfdp1, stdineof;
fd_set  rset;
char  recvbuf[MAXLINE],tmp[128],sendbuf[MAXLINE];
int   n,len,fd;

if(argc!=3){
printf("useage:client address port ");
exit(0);
}
if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1  )
{
perror("socket");
exit(1);
}
printf("%s connect server/n",info);

bzero(&servaddr,sizeof(servaddr));
servaddr.sin_family=AF_INET;
servaddr.sin_port=htons(atoi(argv[2]));
inet_pton(AF_INET,argv[1],&servaddr.sin_addr);

if( ( connect(sockfd,(struct sockaddr*)&servaddr,sizeof(servaddr))  )<0)
{
perror("connect");
exit(1);
}
send(sockfd,info,strlen(info),0);

for ( ; ; ) {
FD_ZERO(&rset);
FD_SET(sockfd, &rset);
FD_SET(0, &rset);
maxfdp1=sockfd+1;

if((select(maxfdp1, &rset, NULL, NULL, NULL) )<=0){
perror("select");
}else{
if (FD_ISSET(0,&rset)){
fgets(sendbuf, MAXLINE, stdin);
n=send(sockfd,sendbuf,strlen(sendbuf)-1,0);
if(n>0)
printf("send: %s",sendbuf);
else
printf("send: %s error,the erro cause is %s:%s/n",sendbuf,errno,strerror(errno));
bzero(sendbuf,strlen(sendbuf));
}

if (FD_ISSET(sockfd, &rset)) { /* socket is readable */
n=recv(sockfd, recvbuf, MAXLINE,0) ;
if(n<0) {
perror("str_cli: server terminated prematurely");
}else if(n==0)
{
printf("sever shutdown!");
exit(-1);
}
//recvbuf
recvbuf
='/0';
printf("receive :%s/n",recvbuf);
fflush(stdout);
bzero(recvbuf,strlen(recvbuf));
}
}
}
exit(0);
}