libevent学习笔记---- 回显服务器 （２）

上一篇写了简单使用libevent的例子，本篇写一个高级一点的回显服务器程序，使用libevent提供的高级利器bufferevent，客户端程序请参考上篇文章。

#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> #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(int fd, short events, void *arg) { evutil_socket_t sock; struct sockaddr_in client; int len; sock = accept(fd, (struct sockaddr*)&client, &len); if (sock < 0) { fprintf(stderr, "accept() error: errno %d --- %s\r\n", errno, strerror(errno)); return; } evutil_make_socket_nonblocking(sock); struct event_base *base = (struct event_base *)arg; struct bufferevent *bev = bufferevent_socket_new(base, sock, 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) { int sock = socket(AF_INET, SOCK_STREAM, 0); if (sock < 0) { fprintf(stderr, "socket() error: errno %d --- %s\r\n", errno, strerror(errno)); return -1; } evutil_make_listen_socket_reuseable(sock); struct sockaddr_in sin; sin.sin_family = AF_INET; sin.sin_addr.s_addr = 0; sin.sin_port = htons(port); if (bind(sock, (struct sockaddr *)&sin, sizeof(sin)) < 0) { fprintf(stderr, "bind() error: errno %d --- %s\r\n", errno, strerror(errno)); goto error; } if (listen(sock, 32) < 0) { fprintf(stderr, "listen() error: errno %d --- %s\r\n", errno, strerror(errno)); goto error; } struct event_base *base = event_base_new(); struct event *ev_listen = event_new(base, sock, EV_READ | EV_PERSIST, do_accept_cb, base); event_add(ev_listen, NULL); event_base_dispatch(base); event_base_free(base); return 0; error: close(sock); return -1; } 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; }