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| #include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <netdb.h>
#include <sys/epoll.h>
#include <sys/socket.h>
#define PERROR() printf("%s:%d: %s\n", __FUNCTION__, __LINE__, strerror(errno))
#define MAX_EVENTS (64)
#define SERVER_HOST NULL
#define SERVER_PORT (8880)
struct event_data {
int fd;
int type;
int r;
int w;
};
int epfd = -1;
int ep_add(int fd, int e, void *data)
{
struct epoll_event ev;
fcntl(fd, F_SETFL, O_NONBLOCK);
ev.events = e;
ev.data.ptr = data;
return epoll_ctl(epfd, EPOLL_CTL_ADD, fd, &ev);
}
int ep_del(int fd)
{
struct epoll_event ev;
return epoll_ctl(epfd, EPOLL_CTL_DEL, fd, &ev);
}
int enum_addr(const char *host, int port, int flags, int (*f)(const struct addrinfo *ai))
{
char service[12];
struct addrinfo hints;
struct addrinfo *res;
struct addrinfo *ai;
int r;
sprintf(service, "%d", port);
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = flags;
r = getaddrinfo(host, service, &hints, &res);
if (r == 0) {
for (ai = res; ai != NULL; ai = ai->ai_next) {
if (f(ai)) {
break;
}
}
freeaddrinfo(res);
}
return r;
}
int accept_client(int s, void (*f)(int, struct sockaddr *, socklen_t))
{
struct sockaddr in_addr;
socklen_t in_len;
int c;
int r;
r = 0;
for (;;) {
c = accept(s, &in_addr, &in_len);
if (c == -1) {
if (errno != EAGAIN) {
r = 1;
}
break;
}
printf("%d accept\n", c);
f(c, &in_addr, in_len);
}
return r;
}
int echo_data(int s)
{
char buf[1024];
int n;
int r;
puts("read");
r = 0;
for (;;) {
n = read(s, buf, 1023);
if (n == 0) {
printf("%d EOF\n", s);
r = 2;
break;
}
if (n == -1) {
if (errno != EAGAIN) {
r = 1;
}
break;
}
buf[n] = 0;
puts(buf);
}
return r;
}
void on_accept_client(int s, struct sockaddr *addr, socklen_t addrlen)
{
struct event_data *d;
d = (struct event_data *)malloc(sizeof(struct event_data));
d->fd = s;
d->type = 1;
d->r = 0;
d->w = 0;
ep_add(s, EPOLLET | EPOLLIN | EPOLLOUT | EPOLLRDHUP, d);
}
void on_poll(struct event_data *data)
{
int r;
switch (data->type) {
case 0:
if (data->r) {
r = accept_client(data->fd, on_accept_client);
data->r = 0;
}
break;
case 1:
if (data->r) {
r = echo_data(data->fd);
data->r = 0;
}
break;
}
if (r != 0) {
if (r != 2) {
PERROR();
}
ep_del(data->fd);
printf("%d close\n", data->fd);
close(data->fd);
free(data);
}
}
int on_listen(const struct addrinfo *ai)
{
int s;
struct event_data *d;
int on;
on = 1;
s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (s != -1) {
if (ai->ai_family == AF_INET6) {
setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on));
}
if (bind(s, ai->ai_addr, ai->ai_addrlen) == 0) {
d = (struct event_data *)malloc(sizeof(struct event_data));
d->fd = s;
d->type = 0;
d->r = 0;
d->w = 0;
ep_add(s, EPOLLET | EPOLLIN, d);
printf("%d listen\n", s);
if (listen(s, SOMAXCONN) == 0) {
return 0;
} else {
ep_del(s);
free(d);
}
}
}
PERROR();
if (s != -1) {
close(s);
}
return 0;
}
int main()
{
struct epoll_event events[MAX_EVENTS];
struct event_data *data;
int r;
int n;
int i;
uint32_t ev;
r = 0;
epfd = epoll_create1(0);
if (epfd == -1) {
PERROR();
return 1;
}
r = enum_addr(SERVER_HOST, SERVER_PORT, AI_PASSIVE, on_listen);
if (r != 0) {
PERROR();
} else {
for (;;) {
n = epoll_wait(epfd, events, MAX_EVENTS, -1);
if (n == -1) {
if (errno == EINTR) {
continue;
}
break;
}
for (i = 0; i < n; i++) {
data = (struct event_data *)events[i].data.ptr;
ev = events[i].events;
if (ev & (EPOLLIN | EPOLLRDHUP | EPOLLHUP | EPOLLERR)) {
data->r = 1;
}
if (ev & (EPOLLOUT | EPOLLHUP | EPOLLERR)) {
data->w = 1;
}
printf("%d r %d w %d\n", data->fd, data->r, data->w);
on_poll(data);
}
}
}
if (epfd != -1) {
close(epfd);
}
return 0;
}
|