The pam_sm_open_session
      function is the service module's implementation of the
      pam_open_session(3)
      interface.
This function is called to commence a session. The only
      valid value for flags is zero
      or:
Do not emit any messages.
Cannot make/remove an entry for the specified session.
The session was successfully started.
pam(3), pam_open_session(3), pam_sm_close_session(3), pam_strerror(3), PAM(8)
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                  See Linux-PAM copyright notice for more information.
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