1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
#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
struct Socket {
int descriptor;
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(const void *msg, size_t length) {
return write(descriptor, msg, length);
}
size_t send(Message &msg) {
size_t result = write(descriptor, msg.data, msg.offset);
msg.offset = 0;
return result;
}
size_t recv(void *msg, size_t length) {
return read(descriptor, msg, length);
}
size_t recv(Message &msg) {
msg.offset = 0;
return read(descriptor, msg.data, MESSAGE_SIZE);
}
~Socket() {
close(descriptor);
}
};
|
