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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 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 5.10 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                                        2020-08-13                            THREAD-KEYRING(7)