[Bug 1330] RFE: 'ControlPersist' support -- automatically fork and leave ControlMaster behind as a daemon

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=1330

Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
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             Blocks|                            |1708

--- Comment #27 from Damien Miller <djm at mindrot.org>  ---
I think the previous patch got the ExitOnForwardFailure case wrong
(though this already had a bug that I just fixed in -current), and
possibly the "ssh -f" case too. I'm pretty sure the revised diff fixes
these. 

The main change is to defer the backgrounding when ExitOnForwardFailure
is set until after the confirm messages for -R forwards have been
received. This means that we need to proceed into the mainloop before
we background and set up a new foreground client, and this in turn
means that we need to save and restore the flags
(tty/no-tty/stdin-null) that we must clobber before we hit the
mainloop.

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