thread-keyring(7) — Linux manual page


THREAD-KEYRING(7)         Linux Programmer's Manual        THREAD-KEYRING(7)

NAME         top

       thread-keyring - per-thread keyring

DESCRIPTION         top

       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         top

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

COLOPHON         top

       This page is part of release 5.09 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

Linux                            2020-08-13                THREAD-KEYRING(7)

Pages that refer to this page: add_key(2)keyctl(2)request_key(2)keyrings(7)keyutils(7)persistent-keyring(7)process-keyring(7)session-keyring(7)user-keyring(7)user-session-keyring(7)