centos man page for function::is_return

FUNCTION::IS_RETURN(3stap)					 Context Functions					FUNCTION::IS_RETURN(3stap)

NAME
       function::is_return - Whether the current probe context is a return probe

SYNOPSIS
	   is_return:long()

ARGUMENTS
       None

DESCRIPTION
       Returns 1 if the current probe context is a return probe, returns 0 otherwise.

SystemTap Tapset Reference					     June 2014						FUNCTION::IS_RETURN(3stap)