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...do this) - and any open file descriptors referring to the tty/pty in any processes that choose to continue running are revoked. - Whereas SVR4 doesn't do any of this and relies on the session leader to do its part and HUP/CONT its process groups. This part is not too clear because Uresh Vahalia mentions this very much in passing on page 108 of "Unix Internals." It is unclear whether closing a pty master causes the pty slave driver to take any action, whether sending singals to any processes or revoking any open file descriptors, when the session process is...