SYNOPSIS
	int set_buffer_size(int size)

DESCRIPTION
	Changes the socket buffer size for this_interactive() to size,
	up to a preconfigured maximum, result is the old buffer size
	(or -1 on systems which aren't able to change the socket
	buffer).
	Modifying the buffer size may result in a better IO
	throughput, but can also worsen it.

HISTORY
	Introduced in 3.2.1@34

SEE ALSO
