libevent学习六(Connect listeners )
evconnlistener_cb cb, void *ptr, unsigned flags, int backlog,
struct evconnlistener *evconnlistener_new_bind(struct event_base *base,
evconnlistener_cb cb, void *ptr, unsigned flags, int backlog,
const struct sockaddr *sa, int socklen);
void evconnlistener_free(struct evconnlistener *lev);
- LEV_OPT_LEAVE_SOCKETS_BLOCKING
By default, when the connection listener accepts a new incoming socket, it sets it up to be nonblocking so that you can use it with the rest of Libevent. Set this flag if you do not want this behavior.
- LEV_OPT_CLOSE_ON_FREE
If this option is set, the connection listener closes its underlying socket when you free it.
- LEV_OPT_CLOSE_ON_EXEC
If this option is set, the connection listener sets the close-on-exec flag on the underlying listener socket. See your platform documentation for fcntl and FD_CLOEXEC for more information.
- LEV_OPT_REUSEABLE
By default on some platforms, once a listener socket is closed, no other socket can bind to the same port until a while has passed. Setting this option makes Libevent mark the socket as reusable, so that once it is closed, another socket can be opened to listen on the same port.
- LEV_OPT_THREADSAFE
Allocate locks for the listener, so that it’s safe to use it from multiple threads. New in Libevent 2.0.8-rc.
- LEV_OPT_DISABLED
Initialize the listener to be disabled, not enabled. You can turn it on manually with evconnlistener_enable(). New in Libevent 2.1.1-alpha.
- LEV_OPT_DEFERRED_ACCEPT
evutil_socket_t sock, struct sockaddr *addr, int len, void *ptr);
evconnlistener_cb cb, void *arg);
int evconnlistener_enable(struct evconnlistener *lev);
void evconnlistener_set_error_cb(struct evconnlistener *lev,
evconnlistener_errorcb errorcb);
struct event_base *evconnlistener_get_base(struct evconnlistener *lev);
#include <event2/bufferevent.h>
#include <event2/buffer.h>
#include <arpa/inet.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
static void
echo_read_cb(struct bufferevent *bev, void *ctx)
{
/* This callback is invoked when there is data to read on bev. */
struct evbuffer *input = bufferevent_get_input(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);
}
static void
echo_event_cb(struct bufferevent *bev, short events, void *ctx)
{
if (events & BEV_EVENT_ERROR)
perror("Error from bufferevent");
if (events & (BEV_EVENT_EOF | BEV_EVENT_ERROR)) {
bufferevent_free(bev);
}
}
static void
accept_conn_cb(struct evconnlistener *listener,
evutil_socket_t fd, struct sockaddr *address, int socklen,
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);
}
static void
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");
return 1;
}
base = event_base_new();
if (!base) {
puts("Couldn't open event base");
return 1;
}
/* 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");
return 1;
}
evconnlistener_set_error_cb(listener, accept_error_cb);
event_base_dispatch(base);
return 0;
}
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