centos man page for function::returnval

FUNCTION::RETURNVAL(3stap)					   Errno Tapset 					FUNCTION::RETURNVAL(3stap)

NAME
       function::returnval - Possible return value of probed function

SYNOPSIS
	   returnval:long()

ARGUMENTS
       None

DESCRIPTION
       Return the value of the register in which function values are typically returned. Can be used in probes where $return isn't available. This
       is only a guess of the actual return value and can be totally wrong. Normally only used in dwarfless probes.

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