The pam_close_session
function is used to indicate that an authenticated session
has ended. The session should have been created with a call
to pam_open_session(3).
It should be noted that the effective uid, geteuid(2). of the application should be of sufficient privilege to perform such tasks as unmounting the user's home directory for example.
The flags argument is the binary or of zero or more of the following values:
Do not emit any messages.