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于 2022-04-26 22:50:16 首次发布

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本文详细介绍了如何使用bufferevent_socket_new()函数创建基于现有socket的事件驱动程序，包括参数解析、功能概述，并提到了与evhttp_connection_base_bufferevent_new()的对比。重点讲解了事件基础、文件描述符设置和可选选项。

EVENT2_EXPORT_SYMBOL struct bufferevent* bufferevent_socket_new	(	struct event_base *	base,
		evutil_socket_t	fd,
		int	options
	)

Create a new socket bufferevent over an existing socket.

Parameters

base	the event base to associate with the new bufferevent.
fd	the file descriptor from which data is read and written to. This file descriptor is not allowed to be a pipe(2). It is safe to set the fd to -1, so long as you later set it with bufferevent_setfd or bufferevent_socket_connect().
options	Zero or more BEV_OPT_* flags

Returns

a pointer to a newly allocated bufferevent struct, or NULL if an error occurred

EVENT2_EXPORT_SYMBOL struct evhttp_connection* evhttp_connection_base_bufferevent_new	(	struct event_base *	base,
		struct evdns_base *	dnsbase,
		struct bufferevent *	bev,
		const char *	address,
		ev_uint16_t	port
	)

Create and return a connection object that can be used to for making HTTP requests.

The connection object tries to resolve address and establish the connection when it is given an http request object.

Connection also has default timeouts for the following events:

Parameters

base	the event_base to use for handling the connection
dnsbase	the dns_base to use for resolving host names; if not specified host name resolution will block.
bev	a bufferevent to use for connecting to the server; if NULL, a socket-based bufferevent will be created. This bufferevent will be freed when the connection closes. It must have no fd set on it.
address	the address to which to connect
port	the port to connect to

Returns

an evhttp_connection object that can be used for making requests or NULL on error