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PROCESS-KEYRING(7) Linux Programmer's Manual PROCESS-KEYRING(7)


     process-keyring - per-process shared keyring


     The  process  keyring  is  a keyring used to anchor keys on behalf of a
     process.  It is created only when a process requests it.   The  process
     keyring has the name (description) _pid.
     A  special  serial  number  value, KEY_SPEC_PROCESS_KEYRING, is defined
     that can be used in lieu of the actual serial  number  of  the  calling
     process's process keyring.
     From  the  keyctl(1) utility, '@p' can be used instead of a numeric key
     ID in much the same way, but since keyctl(1) is  a  program  run  after
     forking, this is of no utility.
     A  thread  created  using  the  clone(2) CLONE_THREAD flag has the same
     process keyring as the caller of clone(2).  When a new process is  cre-
     ated  using  fork()  it  initially has no process keyring.  A process's
     process keyring is  cleared  on  execve(2).   The  process  keyring  is
     destroyed when the last thread that refers to it terminates.
     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, the error ENOKEY results.


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


     This page is part of release 4.16 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

Linux 2017-03-13 PROCESS-KEYRING(7)

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