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bug#13475: 24.2.91; accept-process-output hangs emacs on killed sub-proc
From: |
Lars Ingebrigtsen |
Subject: |
bug#13475: 24.2.91; accept-process-output hangs emacs on killed sub-process |
Date: |
Thu, 03 Oct 2019 19:24:54 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) |
Vitalie Spinu <spinuvit@gmail.com> writes:
> Accept-process-output, when run with WAIT argument, hangs emacs when the
> underlying sub-process was killed. When WAIT is nil this problem does
> not occur.
>
> Start M-x shell and execute:
>
> (let ((proc (get-process "shell")))
> (process-send-string proc "sleep 60\n")
> (while (not (accept-process-output proc .01))))
>
> This puts emacs in a loop as expected. Now kill the bash process from
> outside emacs and you will see that emacs is still hanged.
>
> This problem does not occur when WAIT argument is nil. For example on
> the execution of the following code, emacs successfully exits the waiting
> loop after the bash process has been killed:
>
> (let ((proc (get-process "shell")))
> (accept-process-output proc))
(I'm going through old Emacs bug reports that unfortunately got no
response at the time.)
I'm don't think this is a bug -- as you say, if PROC is dead, then we
just heed the timeout, so in a loop like this, you should check whether
PROC is alive before calling `accept-process-output'.
So I'm closing this bug report. I somebody things that Emacs should be
changed to make accept-process-output to return immediately (with a
non-nil return value?) if PROC is dead, please reopen.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
- bug#13475: 24.2.91; accept-process-output hangs emacs on killed sub-process,
Lars Ingebrigtsen <=