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 (de‐
       scription) _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 ter‐
       minates.

       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  modi‐
       fied; 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)

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