Man page - thread-keyring(7)

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Manual

thread-keyring

NAME
DESCRIPTION
SEE ALSO

NAME

thread-keyring - per-thread keyring

DESCRIPTION

The thread keyring is a keyring used to anchor keys on behalf of a process. It is created only when a thread requests it. The thread keyring has the name (description) _tid .

A special serial number value, KEY_SPEC_THREAD_KEYRING , is defined that can be used in lieu of the actual serial number of the calling thread’s thread keyring.

From the keyctl (1) utility, ’ @t ’ can be used instead of a numeric key ID in much the same way, but as keyctl (1) is a program run after forking, this is of no utility.

Thread keyrings are not inherited across clone (2) and fork (2) and are cleared by execve (2). A thread keyring is destroyed when the thread that refers to it terminates.

Initially, a thread does not have a thread keyring. If a thread doesn’t have a thread keyring when it is accessed, then it will be created if it is to be modified; otherwise the operation fails with the error ENOKEY .