error – return an error|
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
corresponding 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>.