Provided by: systemtap-doc_2.3-1ubuntu1.4_all 

NAME
function::nfsderror - Convert nfsd error number into string
SYNOPSIS
nfsderror:string(err:long)
ARGUMENTS
err
errnum
DESCRIPTION
This function returns a string for the error number passed into the function.
SystemTap Tapset Reference March 2016 FUNCTION::NFSDERROR(3stap)