thread-keyring - Per-thread keyring


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

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

   From the keyctl utility, '@t' 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.

   Thread keyrings are not inherited across clone()  and  are  cleared  by
   execve().  A thread keyring is destroyed when the thread that refers to
   it exits.

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




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