server借鉴的是别人的代码
#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 <openssl/ssl.h>
#include <openssl/err.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];
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));
close(new_fd);
return -1;
}
/* 处理每个新连接上的数据收发结束 */
return len;
}
int main()
{
int listener, new_fd, kdpfd, nfds, n, ret, curfds;
socklen_t len;
struct sockaddr_in my_addr, their_addr;
unsigned int myport, lisnum;
struct epoll_event ev;
struct epoll_event events[MAXEPOLLSIZE];
struct rlimit rt;
myport = 6000;
lisnum = 2;
/* 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");
}
setnonblocking(listener);
bzero(&my_addr, sizeof(my_addr));
my_addr.sin_family = PF_INET;
my_addr.sin_port = htons(myport);
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[n].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 socket 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[n].data.fd);
if (ret < 1 && errno != 11)
{
epoll_ctl(kdpfd, EPOLL_CTL_DEL, events[n].data.fd,&ev);
curfds--;
}
}
}
}
close(listener);
return 0;
}
client代码
// echo_client.cpp
// g++ -o echo_client -O3 echo_client.cpp -lboost_system -lboost_thread
#include <boost/asio.hpp>
namespace asio = boost::asio;
using asio::ip::tcp;
#include <boost/bind.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/enable_shared_from_this.hpp>
#include <stdio.h>
#include<sys/time.h>
#include<unistd.h>
FILE* g_hLog = 0;
class session
: public boost::enable_shared_from_this<session>
{
public:
session(asio::io_service& io)
: socket_(io)
{ }
tcp::socket& socket()
{ return socket_; }
void start(int nindex)
{
m_nIndex = nindex;
snprintf(output_buffer_, sizeof(output_buffer_), "this is %d client.", m_nIndex);
//fprintf(g_hLog, "%s\n", output_buffer_);
asio::async_write(socket_, asio::buffer(output_buffer_, 12), boost::bind(&session::handle_write, shared_from_this(), _1, _2));
}
void handle_write(const boost::system::error_code& ec, std::size_t bytes_transfered)
{
fprintf(g_hLog, "%d write %s\n", m_nIndex, ec.message().data());
if(!ec)
{
//asio::async_read(socket_, asio::buffer(input_buffer_, 12), boost::bind(&session::handle_read, shared_from_this(), _1, _2));
}
else {
std::cerr << "write error:" << ec.message() << std:: endl;
}
}
void handle_read(const boost::system::error_code& ec, std::size_t bytes_transfered)
{
if(ec)
{
std::cerr << "read error:" << ec.message() << std::endl;
}
}
private:
tcp::socket socket_;
int m_nIndex;
char output_buffer_[50];
char input_buffer_[50];
};
void handle_connect(boost::shared_ptr<session> session_ptr, int nindex, const boost::system::error_code& ec)
{
if(ec)
{
fprintf(g_hLog, "%d connect error: %s\n", nindex, ec.message().data());
std::cerr << "connect error:" << ec.message() << std::endl;
} else {
session_ptr->start(nindex);
}
}
int main(/*int argc, char* argv[]*/)
{
g_hLog = fopen("log.txt", "wr");
if(!g_hLog)
return 0;
struct timeval time1, time2;
gettimeofday(&time1, 0);
asio::io_service io;
tcp::resolver resolver(io);
tcp::resolver::iterator endpoint = resolver.resolve(tcp::resolver::query("localhost", "6000"));
boost::shared_ptr<session> session_ptr;
for(int i = 0; i < 10000; i++)
{
session_ptr.reset(new session(io));
asio::async_connect(session_ptr->socket(), endpoint, boost::bind(handle_connect, session_ptr, i, _1));
}
io.run();
gettimeofday(&time2, 0);
std::cout << "has time:" << double((time2.tv_sec-time1.tv_sec)+(time2.tv_usec-time1.tv_usec)/1000000.0) << std::endl;
fprintf(g_hLog, "has time: %f s", double((time2.tv_sec-time1.tv_sec)+(time2.tv_usec-time1.tv_usec)/1000000.0));
fclose(g_hLog);
}
Linux默认最大的文件句柄数是1024，需要修改此值才能正常测试，打开终端执行如下命令
echo ulimit -n 65535 >> /etc/profile