The thread keyring is a keyring used to anchor keys on behalf of a
process. It is only created when a thread requests it.
A special serial number value, KEY_SPEC_THREAD_KEYRING, is defined that
can be used in lieu of the calling thread's thread keyring's actual
From the keyctl utility, '@t' can be used instead of a numeric key ID
in much the same way, but as keyctl is a program run after forking,
this is of no utility.
Thread keyrings are not inherited across clone() and are cleared by
execve(). A thread keyring is destroyed when the thread that refers to
If a thread doesn't have a thread keyring when it is accessed, then the
thread keyring will be created if the keyring is to be modified, other-
wise error ENOKEY will be issued.
Linux 20 Feb 2014 THREAD-KEYRING(7)
Man Pages Copyright Respective Owners. Site Copyright (C) 1994 - 2019
All Rights Reserved.