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.

SEE ALSO

       keyctl(1), keyctl(3), keyrings(7), persistent-keyring(7), process-keyring(7),
       session-keyring(7), user-keyring(7), user-session-keyring(7)

COLOPHON

       This page is part of release 5.13 of the Linux man-pages project.  A description of the
       project, information about reporting bugs, and the latest version of this page, can be
       found at https://www.kernel.org/doc/man-pages/.