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#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <assert.h>
#include <stdlib.h>
#include <pthread.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/epoll.h>
#include <iostream>
using namespace std;
#define MAX_EVENT_NUMBER 1024
#define TCP_BUFFER_SIZE 512
#define UDP_BUFFER_SIZE (1024*4)
#define EFFECT_TEST "Server received!!"
int setnonblocking(int fd)
{
int old_option = fcntl(fd, F_GETFL);
int new_option = old_option | O_NONBLOCK;
fcntl(fd, F_SETFL, new_option);
return old_option;
}
void addfd(int epollfd, int fd)
{
epoll_event event;
event.data.fd = fd;
event.events = EPOLLIN;
epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &event);
setnonblocking(fd);
}
int main(int argc, char* argv[])
{
if(argc <= 2)
{
printf("usage: %s ip_address port_number\n", basename(argv[0]));
return 1;
}
const char* ip = argv[1];
int port = atoi(argv[2]);
int ret = 0;
struct sockaddr_in address;
bzero(&address, sizeof(address));
address.sin_family = AF_INET;
inet_pton(AF_INET, ip, &address.sin_addr);
address.sin_port = htons(port);
int listenfd = socket(PF_INET, SOCK_STREAM, 0);
assert(listenfd >= 0);
ret = bind(listenfd, (struct sockaddr*)&address, sizeof(address));
assert(ret != -1);
ret = listen(listenfd, 5);
assert(ret != -1);
bzero(&address, sizeof(address));
address.sin_family = AF_INET;
inet_pton(AF_INET, ip, &address.sin_addr);
address.sin_port = htons(port);
int udpfd = socket(PF_INET, SOCK_DGRAM, 0);
assert(udpfd >= 0);
ret = bind(udpfd, (struct sockaddr*)&address, sizeof(address));
assert(ret != -1);
int epollfd = epoll_create(5);
assert(epollfd != -1);
addfd(epollfd, listenfd);
addfd(epollfd, udpfd);
epoll_event events[ MAX_EVENT_NUMBER ];
while(1)
{
int number = epoll_wait(epollfd, events, MAX_EVENT_NUMBER, -1);
if (number < 0)
{
printf("epoll failure\n");
break;
}
for (int i = 0; i < number; i++)
{
int sockfd = events[i].data.fd;
if (sockfd == listenfd)
{
struct sockaddr_in client_address;
socklen_t client_addrlength = sizeof(client_address);
int connfd = accept(listenfd, (struct sockaddr*)&client_address, &client_addrlength);
addfd(epollfd, connfd);
}
else if (sockfd == udpfd)
{
char buf[ UDP_BUFFER_SIZE ];
memset(buf, '\0', UDP_BUFFER_SIZE);
struct sockaddr_in client_address;
socklen_t client_addrlength = sizeof(client_address);
ret = recvfrom(udpfd, buf, UDP_BUFFER_SIZE-1, 0, (struct sockaddr*)&client_address, &client_addrlength);
if(ret > 0)
{
cout << "this is UDP:" << buf << endl;
sendto(udpfd, EFFECT_TEST, UDP_BUFFER_SIZE-1, 0, (struct sockaddr*)&client_address, client_addrlength);
}
}
else if (events[i].events & EPOLLIN)
{
char buf[ TCP_BUFFER_SIZE ];
while(1)
{
memset(buf, '\0', TCP_BUFFER_SIZE);
ret = recv(sockfd, buf, TCP_BUFFER_SIZE-1, 0);
if(ret < 0)
{
if((errno == EAGAIN) || (errno == EWOULDBLOCK))
{
break;
}
close(sockfd);
break;
}
else if(ret == 0)
{
close(sockfd);
}
else
{
cout << "this is TCP:" << buf << endl;
send(sockfd, EFFECT_TEST, sizeof(EFFECT_TEST), 0);
}
}
}
else
{
printf("something else happened \n");
}
}
}
close(listenfd);
return 0;
}
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