NAME
	set_read_callback - set 'data available' callback

SYNTAX
	#include "backend.h"

	void set_read_callback(int fd,file_callback cb,void *data);

DESCRIPTION
	This function sets what function should be called when there is
	more data to be read from 'fd'. The 'file_callback' should be a
	function like this:

	void file_callback(int fd, void *data);

	The arguments are the same as sent to set_read_callback().
	To disable the read callback, call set_read_callback again with
	cb and data equal to zero.

KEYWORDS
	low_level

SEE ALSO
	set_write_callback, set_nonblocking
