libevent终于编译通过了

在网上找了个例子，其实libevent本身带了很多测试用例，不过这是第一次编译成功，尼玛 各种高性能IO库都是在linux下的，win32果断被bs了，还好有libevent对win32支持的比较好。lib很顺利的编译好了。

下面就是很简单的使用下socket：

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <assert.h>
#include <WS2tcpip.h>
#include <windows.h>
#include <winsock.h>
#pragma comment(lib,"ws2_32.lib")

#include <event2/event.h>
#include <event2/bufferevent.h>

#define LISTEN_PORT 9999
#define LISTEN_BACKLOG 32

void do_accept(evutil_socket_t listener, short event, void *arg);
void read_cb(struct bufferevent *bev, void *arg);
void error_cb(struct bufferevent *bev, short event, void *arg);
void write_cb(struct bufferevent *bev, void *arg);

int main(int argc, char *argv[])
{
	WSADATA Data;
	int status=WSAStartup(MAKEWORD(1, 1), &Data);
	if (status != 0)
		return 0;

	int ret = 0;
	evutil_socket_t listener;
	listener = socket(AF_INET, SOCK_STREAM, 0);
	assert(listener > 0);
	evutil_make_listen_socket_reuseable(listener);

	struct sockaddr_in sin;
	sin.sin_family = AF_INET;
	sin.sin_addr.s_addr = 0;
	sin.sin_port = htons(LISTEN_PORT);

	if (bind(listener, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
		perror("bind");
		return 1;
	}

	if (listen(listener, LISTEN_BACKLOG) < 0) {
		perror("listen");
		return 1;
	}

	printf ("Listening...\n");

	evutil_make_socket_nonblocking(listener);

	struct event_base *base = event_base_new();
	assert(base != NULL);
	struct event *listen_event;
	listen_event = event_new(base, listener, EV_READ|EV_PERSIST, do_accept, (void*)base);
	event_add(listen_event, NULL);
	event_base_dispatch(base);

	printf("The End.");
	return 0;
}

void do_accept(evutil_socket_t listener, short event, void *arg)
{
	struct event_base *base = (struct event_base *)arg;
	evutil_socket_t fd;
	struct sockaddr_in sin;
	socklen_t slen;
	fd = accept(listener, (struct sockaddr *)&sin, &slen);
	if (fd < 0) {
		perror("accept");
		return;
	}
	if (fd > FD_SETSIZE) {
		perror("fd > FD_SETSIZE\n");
		return;
	}

	printf("ACCEPT: fd = %u\n", fd);

	struct bufferevent *bev = bufferevent_socket_new(base, fd, BEV_OPT_CLOSE_ON_FREE);
	bufferevent_setcb(bev, read_cb, NULL, error_cb, arg);
	bufferevent_enable(bev, EV_READ|EV_WRITE|EV_PERSIST);
}

void read_cb(struct bufferevent *bev, void *arg)
{
#define MAX_LINE    256
	char line[MAX_LINE+1];
	int n;
	evutil_socket_t fd = bufferevent_getfd(bev);

	while (n = bufferevent_read(bev, line, MAX_LINE), n > 0) {
		line[n] = '\0';
		printf("fd=%u, read line: %s\n", fd, line);

		bufferevent_write(bev, line, n);
	}
}

void write_cb(struct bufferevent *bev, void *arg) {}

void error_cb(struct bufferevent *bev, short event, void *arg)
{
	evutil_socket_t fd = bufferevent_getfd(bev);
	printf("fd = %u, ", fd);
	if (event & BEV_EVENT_TIMEOUT) {
		printf("Timed out\n"); //if bufferevent_set_timeouts() called
	}
	else if (event & BEV_EVENT_EOF) {
		printf("connection closed\n");
	}
	else if (event & BEV_EVENT_ERROR) {
		printf("some other error\n");
	}
	bufferevent_free(bev);
}