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#include <unistd.h>
#include <sys/socket.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <sys/epoll.h>
#define MAX_EVENTS 10
#define PORT 6969
class Socket {
int descriptor;
public:
Socket() {
descriptor = socket(AF_INET, SOCK_STREAM, 0);
}
Socket(int descriptor) : descriptor(descriptor) {}
typedef void (*EventAction) (int);
void listen(EventAction on_new_connection, EventAction on_existing_connection) {
sockaddr_in addr = { AF_INET, htons(PORT), htonl(INADDR_LOOPBACK)};
int opt = 1;
setsockopt(descriptor, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt));
bind(descriptor, (sockaddr *) &addr, sizeof(sockaddr_in));
::listen(descriptor, MAX_EVENTS);
int epollfd = epoll_create1(0);
epoll_event ev;
ev.events = EPOLLIN;
ev.data.fd = descriptor;
epoll_ctl(epollfd, EPOLL_CTL_ADD, descriptor, &ev);
epoll_event events[MAX_EVENTS];
while (true) {
int nfds = epoll_wait(epollfd, events, MAX_EVENTS, -1);
for (int i = 0; i < nfds; i++) {
if (events[i].data.fd == descriptor) {
int clientfd = accept(descriptor, 0, 0);
ev.events = EPOLLIN | EPOLLET;
ev.data.fd = clientfd;
epoll_ctl(epollfd, EPOLL_CTL_ADD, clientfd, &ev);
on_new_connection(clientfd);
} else {
on_existing_connection(events[i].data.fd);
}
}
}
}
void connect() {
sockaddr_in addr = { AF_INET, htons(PORT), htonl(INADDR_LOOPBACK) };
::connect(descriptor, (sockaddr *) &addr, sizeof(sockaddr_in));
}
size_t send(void *msg, size_t length) {
return write(descriptor, msg, length);
}
size_t recv(void *msg, size_t length) {
return read(descriptor, msg, length);
}
~Socket() {
close(descriptor);
}
};
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