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| #include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<assert.h>
#include<stdio.h>
#include<unistd.h>
#include<errno.h>
#include<string.h>
#include<fcntl.h>
#include<stdlib.h>
#include<sys/epoll.h>
#include<pthread.h>
#define MAX_EVENT_NUMBER 1024
#define BUFFER_SIZE 10
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, bool enable_et)
{
epoll_event event;
event.data.fd = fd;
event.events = EPOLLIN;
if (enable_et)
{
event.events |= EPOLLET;
}
epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &event);
setnonblocking(fd);
}
void lt(epoll_event* events, int number, int epollfd, int listenfd)
{
char buf[BUFFER_SIZE];
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, false);
printf("connect fd:%d listenfd=%d\n", connfd, listenfd);
} else if (events[i].events & EPOLLIN) {
printf("event trigger once\n");
memset(buf, '\0', BUFFER_SIZE);
int ret = recv(sockfd, buf, BUFFER_SIZE - 1, 0);
printf("socket fd:%d listenfd=%d\n", sockfd, listenfd);
if (ret < 0) {
close(sockfd);
continue;
}
printf("get %d bytes of content: %s\n", ret, buf);
} else {
printf("sth else happend\n");
}
}
}
void et(epoll_event* events, int number, int epollfd, int listenfd)
{
char buf[BUFFER_SIZE];
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, true);
} else if (events[i].events & EPOLLIN) {
printf("event trigger once\n");
while (1) {
memset(buf, '\0', BUFFER_SIZE);
int ret = recv(sockfd, buf, BUFFER_SIZE - 1, 0);
if (ret < 0) {
if ((errno == EAGAIN) || (errno == EWOULDBLOCK)) {
printf("read later\n");
break;
}
close(sockfd);
break;
} else if (ret == 0) {
close(sockfd);
} else {
printf("get %d bytes of content:%s\n", ret, buf);
}
}
} else {
printf("nothing happend\n");
}
}
}
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);
epoll_event events[MAX_EVENT_NUMBER];
int epollfd = epoll_create(5);
addfd(epollfd, listenfd, true);
while(1) {
int ret = epoll_wait(epollfd, events, MAX_EVENT_NUMBER, -1);
if (ret < 0) {
printf("epoll fail\n");
break;
}
et(events, ret, epollfd, listenfd);
}
close(listenfd);
return 0;
}
|
