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epoll_server_example.cpp
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epoll_server_example.cpp
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/epoll.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#define ECHO_SERVER_PORT 60000
#define LISTEN_BACKLOG 16
#define MAX_EVENT_COUNT 32
#define BUF_SIZE 2048
int main() {
int ret, i;
int server_fd, client_fd, epoll_fd;
int ready_count;
struct sockaddr_in server_addr;
struct sockaddr_in client_addr;
socklen_t addr_len;
struct epoll_event event;
struct epoll_event* event_array;
char* buf;
event_array = (struct epoll_event*)
malloc(sizeof(struct epoll_event)*MAX_EVENT_COUNT);
buf = (char*)malloc(sizeof(char)*BUF_SIZE);
memset(&server_addr, 0, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
server_addr.sin_port = htons(ECHO_SERVER_PORT);
server_fd = socket(AF_INET, SOCK_STREAM, 0);
if(server_fd == -1) {
perror("create socket failed.\n");
return 1;
}
ret = bind(server_fd, (struct sockaddr*)&server_addr, sizeof(server_addr));
if(ret == -1) {
perror("bind failed.\n");
return 1;
}
ret = listen(server_fd, LISTEN_BACKLOG);
if(ret == -1) {
perror("listen failed.\n");
return 1;
}
epoll_fd = epoll_create(1);
if(epoll_fd == -1) {
perror("epoll_create failed.\n");
return 1;
}
event.events = EPOLLIN;
event.data.fd = server_fd;
ret = epoll_ctl(epoll_fd, EPOLL_CTL_ADD, server_fd, &event);
if(ret == -1) {
perror("epoll_ctl failed.\n");
return 1;
}
while(1) {
ready_count = epoll_wait(epoll_fd, event_array, MAX_EVENT_COUNT, -1);
if(ready_count == -1) {
perror("epoll_wait failed.\n");
return 1;
}
for(i = 0; i < ready_count; i++) {
if(event_array[i].data.fd == server_fd) {
client_fd = accept(server_fd,
(struct sockaddr*)&client_addr, &addr_len);
if(client_fd == -1) {
perror("accept failed.\n");
return 1;
}
event.events = EPOLLIN;
event.data.fd = client_fd;
ret = epoll_ctl(epoll_fd, EPOLL_CTL_ADD, client_fd, &event);
if(ret == -1) {
perror("epoll_ctl failed.\n");
return 1;
}
}
else {
ret = recv(event_array[i].data.fd, buf, BUF_SIZE, 0);
if(ret <= 0) {
close(event_array[i].data.fd);
epoll_ctl(epoll_fd, EPOLL_CTL_DEL,
event_array[i].data.fd, &event);
continue;
}
ret = send(event_array[i].data.fd, buf, (size_t)ret, 0);
if(ret == -1) {
perror("send failed.\n");
}
}
} // for each event
} // while(1)
close(epoll_fd);
close(server_fd);
free(event_array);
free(buf);
return 0;
}