ERROR(5)ERROR(5)NAMEerror - return an errorSYNOPSIS
size Rerror tag ename[s]
The Rerror message (there is no Terror) is used to return an error
string describing the failure of a transaction. It replaces the corre‐
sponding reply message that would accompany a successful call; its tag
is that of the failing request.
By convention, clients may truncate error messages after ERRMAX-1
bytes; ERRMAX is defined in <libc.h>.