libevent学习笔记---- 回显服务器 （3）

在libevent库中提供了evconnlistener系列函数接口，让我们更容易的去监听和建立TCP链接。下面就是使用evconnlistener来构建 的一个高级点的回显服务器。老规矩，废话少说，直接上代码。至于客户端代码可以参考第一篇。 #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #include <errno.h> #include <fcntl.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <event2/event.h> #include <event2/bufferevent.h> #include <event2/buffer.h> #include <event2/listener.h> #define MAX_BUF_SIZE 1024 void do_event_cb(struct bufferevent *bev, short event, void *arg) { if (event & BEV_EVENT_EOF) { printf("connection closed by peer, socket: %d ...\r\n", bufferevent_getfd(bev)); } else if (event & BEV_EVENT_ERROR) { printf("some error happened ...\r\n"); } bufferevent_free(bev); } void do_read_cb(struct bufferevent *bev, void *arg) { struct evbuffer *input = bufferevent_get_input(bev); struct evbuffer *output = bufferevent_get_output(bev); int len = evbuffer_get_length(input); if (len) { evbuffer_add_buffer(output, input); } } void do_accept_cb(struct evconnlistener *listener, int fd, struct sockaddr *address, int socklen, void *arg) { struct event_base *base = evconnlistener_get_base(listener); struct bufferevent *bev = bufferevent_socket_new(base, fd, BEV_OPT_CLOSE_ON_FREE); bufferevent_setcb(bev, do_read_cb, NULL, do_event_cb, arg); bufferevent_enable(bev, EV_READ | EV_PERSIST); } int init_echo_server(int port) { struct evconnlistener *listener; struct sockaddr_in sin; sin.sin_family = AF_INET; sin.sin_addr.s_addr = 0; sin.sin_port = htons(port); struct event_base *base = event_base_new(); listener = evconnlistener_new_bind(base, do_accept_cb, NULL, LEV_OPT_CLOSE_ON_FREE|LEV_OPT_REUSEABLE, -1, (struct sockaddr*)&sin, sizeof(sin)); if (!listener) { fprintf(stderr, "evconnlistener_new_bind() error ...\r\n"); return -1; } event_base_dispatch(base); event_base_free(base); return 0; } int main(int argc, char **argv) { int port = 9999; if (argc >= 2) { port = atoi(argv[1]); if (port < 0 || port > 65535) { fprintf(stderr, "Invalid port ...\r\n"); return -1; } } init_echo_server(port); return 0; }