[Bug 2492] Incomplete output of child process

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2492

--- Comment #8 from Volth <openssh at volth.com> ---
I noticed that read() returns EAGAIN many times, openssh call read()
again until it returns success (or other error).
I does not cause any problem unless the heuristic is applied, I mean
the line "force = c->isatty && c->detach_close && c->istate !=
CHAN_INPUT_CLOSED;"

If there is no pty allocated - there is no problem with EAGAIN, read()
returns EAGAIN, openssd retries.
Until openssh get the exitcode of the child process - there is no
problem with EAGAIN, read() returns EAGAIN, openssd retries.

The problem is only when openssh gets the the exitcode (thus set
c->detach_close to true) and only since this moment EAGAIN becomes
illegal. But it happens. It happens before openssh gets the the
exitcode as well it happens after openssh gets the the exitcode.

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