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THREAD-KEYRING(7)          Linux Programmer's Manual         THREAD-KEYRING(7)
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  fork-
       ing, 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 cre-
       ated  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 4.15 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/.
Linux                             2017-03-13                 THREAD-KEYRING(7)