翻譯：libevent參考手冊第九章：連線監聽器：接受TCP連線 (十一) (轉)
阿新 • • 發佈：2018-12-23
#include <event2/listener.h>
#include <event2/bufferevent.h>
#include <event2/buffer.h>
#include <arpa/inet.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>staticvoid
echo_read_cb(struct bufferevent *bev, void*ctx)
{
/* This callback is invoked when there is data to read on bev.
struct evbuffer *output = bufferevent_get_output(bev);
/* Copy all the data from the input buffer to the output buffer. */
evbuffer_add_buffer(output, input);
}
staticvoid
echo_event_cb(struct bufferevent *bev, short events, void*
{
if (events & BEV_EVENT_ERROR)
perror("Error from bufferevent");
if (events & (BEV_EVENT_EOF | BEV_EVENT_ERROR)) {
bufferevent_free(bev);
}
}
staticvoid
accept_conn_cb(struct evconnlistener *listener,
evutil_socket_t fd, struct sockaddr
void*ctx)
{
/* We got a new connection! Set up a bufferevent for it. */struct event_base *base= evconnlistener_get_base(listener);
struct bufferevent *bev = bufferevent_socket_new(
base, fd, BEV_OPT_CLOSE_ON_FREE);
bufferevent_setcb(bev, echo_read_cb, NULL, echo_event_cb, NULL);
bufferevent_enable(bev, EV_READ|EV_WRITE);
}
staticvoid
accept_error_cb(struct evconnlistener *listener, void*ctx)
{
struct event_base *base= evconnlistener_get_base(listener);
int err = EVUTIL_SOCKET_ERROR();
fprintf(stderr, "Got an error %d (%s) on the listener. ""Shutting down.\n", err, evutil_socket_error_to_string(err));
event_base_loopexit(base, NULL);
}
int
main(int argc, char**argv)
{
struct event_base *base;
struct evconnlistener *listener;
struct sockaddr_in sin;
int port =9876;
if (argc >1) {
port = atoi(argv[1]);
}
if (port<=0|| port>65535) {
puts("Invalid port");
return1;
}
base= event_base_new();
if (!base) {
puts("Couldn't open event base");
return1;
}
/* Clear the sockaddr before using it, in case there are extra
* platform-specific fields that can mess us up. */
memset(&sin, 0, sizeof(sin));
/* This is an INET address */
sin.sin_family = AF_INET;
/* Listen on 0.0.0.0 */
sin.sin_addr.s_addr = htonl(0);
/* Listen on the given port. */
sin.sin_port = htons(port);
listener = evconnlistener_new_bind(base, accept_conn_cb, NULL,
LEV_OPT_CLOSE_ON_FREE|LEV_OPT_REUSEABLE, -1,
(struct sockaddr*)&sin, sizeof(sin));
if (!listener) {
perror("Couldn't create listener");
return1;
}
evconnlistener_set_error_cb(listener, accept_error_cb);
event_base_dispatch(base);
return0;
}
#include <event2/bufferevent.h>
#include <event2/buffer.h>
#include <arpa/inet.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>staticvoid
echo_read_cb(struct bufferevent *bev, void*ctx)
{
/* This callback is invoked when there is data to read on bev.
struct evbuffer *output = bufferevent_get_output(bev);
/* Copy all the data from the input buffer to the output buffer. */
evbuffer_add_buffer(output, input);
}
staticvoid
echo_event_cb(struct bufferevent *bev, short events, void*
{
if (events & BEV_EVENT_ERROR)
perror("Error from bufferevent");
if (events & (BEV_EVENT_EOF | BEV_EVENT_ERROR)) {
bufferevent_free(bev);
}
}
staticvoid
accept_conn_cb(struct evconnlistener *listener,
evutil_socket_t fd, struct sockaddr
void*ctx)
{
/* We got a new connection! Set up a bufferevent for it. */struct event_base *base= evconnlistener_get_base(listener);
struct bufferevent *bev = bufferevent_socket_new(
base, fd, BEV_OPT_CLOSE_ON_FREE);
bufferevent_setcb(bev, echo_read_cb, NULL, echo_event_cb, NULL);
bufferevent_enable(bev, EV_READ|EV_WRITE);
}
staticvoid
accept_error_cb(struct evconnlistener *listener, void*ctx)
{
struct event_base *base= evconnlistener_get_base(listener);
int err = EVUTIL_SOCKET_ERROR();
fprintf(stderr, "Got an error %d (%s) on the listener. ""Shutting down.\n", err, evutil_socket_error_to_string(err));
event_base_loopexit(base, NULL);
}
int
main(int argc, char**argv)
{
struct event_base *base;
struct evconnlistener *listener;
struct sockaddr_in sin;
int port =9876;
if (argc >1) {
port = atoi(argv[1]);
}
if (port<=0|| port>65535) {
puts("Invalid port");
return1;
}
base= event_base_new();
if (!base) {
puts("Couldn't open event base");
return1;
}
/* Clear the sockaddr before using it, in case there are extra
* platform-specific fields that can mess us up. */
memset(&sin, 0, sizeof(sin));
/* This is an INET address */
sin.sin_family = AF_INET;
/* Listen on 0.0.0.0 */
sin.sin_addr.s_addr = htonl(0);
/* Listen on the given port. */
sin.sin_port = htons(port);
listener = evconnlistener_new_bind(base, accept_conn_cb, NULL,
LEV_OPT_CLOSE_ON_FREE|LEV_OPT_REUSEABLE, -1,
(struct sockaddr*)&sin, sizeof(sin));
if (!listener) {
perror("Couldn't create listener");
return1;
}
evconnlistener_set_error_cb(listener, accept_error_cb);
event_base_dispatch(base);
return0;
}