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🗣 Wd提问: libevent tcp服务器

🤖 Ai回答:
Libevent是一个用于处理事件的库，它支持多种事件模型，包括select、poll、epoll、kqueue等。下面是一个使用libevent创建TCP服务器的简单示例：

c
include <event2/event.h
include <event2/bufferevent.h
include <event2/listener.h
include <event2/buffer.h
include <event2/util.h
include <event2/thread.h

include <arpa/inet.h
include <netinet/in.h
include <sys/socket.h
include <unistd.h

include <stdio.h
include <stdlib.h
include <string.h

void read_cb(struct bufferevent *bev, void *ctx) {
struct evbuffer *input = bufferevent_get_input(bev);
struct evbuffer *output = bufferevent_get_output(bev);

size_t len = evbuffer_get_length(input);
evbuffer_add_buffer(output, input);
}

void event_cb(struct bufferevent *bev, short events, void *ctx) {
if (events & BEV_EVENT_EOF) {
printf(Connection closed.\n);
} else if (events & BEV_EVENT_ERROR) {
printf(Got an error on the connection: %s\n, strerror(errno));
}
bufferevent_free(bev);
}

void accept_conn_cb(struct evconnlistener *listener, evutil_socket_t fd,
struct sockaddr *address, int socklen, void *ctx) {
struct event_base *base = evconnlistener_get_base(listener);
struct bufferevent *bev = bufferevent_socket_new(base, fd, BEV_OPT_CLOSE_ON_FREE);

bufferevent_setcb(bev, read_cb, NULL, event_cb, NULL);
bufferevent_enable(bev, EV_READ | EV_WRITE);
}

int main(int argc, char **argv) {
struct event_base *base = event_base_new();
if (!base) {
fprintf(stderr, Could not initialize libevent!\n);
return 1;
}

struct sockaddr_in sin;
memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_port = htons(12345);
sin.sin_addr.s_addr = 0;

struct evconnlistener *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) {
fprintf(stderr, Could not create a listener!\n);
return 1;
}

event_base_dispatch(base);

return 0;
}

这个程序创建了一个TCP服务器，监听12345端口。当有新的连接到来时，它会创建一个新的bufferevent来处理这个连接。当有数据可读时，它会将读到的数据写回客户端。当连接关闭或发生错误时，它会关闭这个连接。

注意：这个程序只是一个简单的示例，实际使用时可能需要处理更多的错误情况和边界情况。

Ai作答

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