process-keyring

       The  process  keyring  is  a keyring used to anchor keys on behalf of a
       process.  It is only created when a process requests it.

       A special serial number  value,  KEY_SPEC_PROCESS_KEYRING,  is  defined
       that  can  be  used  in lieu of the calling process's process keyring's
       actual serial number.

       From the keyctl utility, '@p' can be used instead of a numeric  key  ID
       in  much  the  same  way, but as keyctl is a program run after forking,
       this is of no utility.

       A  process's  process  keyring  is  inherited   across   clone()   with
       CLONE_THREAD  and  is cleared by execve().  The process keyring will be
       destroyed when the last thread that refers to it exits.

       If a process doesn't have a process keyring when it is  accessed,  then
       the  process  keyring will be created if the keyring is to be modified,
       otherwise error ENOKEY will be issued.

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

Linux                             19 Feb 2014               PROCESS-KEYRING(7)
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