Provided by: keyutils_1.5.9-9.2ubuntu2_amd64
thread-keyring - Per-thread keyring
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 serial number. 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 it exits. 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, otherwise error ENOKEY will be issued.
keyctl(1), keyctl(3), keyrings(7), process-keyring(7), session-keyring(7), user-keyring(7), user-session-keyring(7) persistent-keyring(7)