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bug#33050: 27.0.50; [macOS] Problem with process input with process-conn
From: |
Thomas Fitzsimmons |
Subject: |
bug#33050: 27.0.50; [macOS] Problem with process input with process-connection-type nil |
Date: |
Wed, 24 Oct 2018 12:20:31 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) |
Filipp Gunbin <fgunbin@fastmail.fm> writes:
> This may be the clue to the problem:
>
> man termios(4):
>
> If a process is in the foreground process group of its controlling termi-
> nal, read operations are allowed. Any attempts by a process in a back-
> ground process group to read from its controlling terminal causes a
> SIGTTIN signal to be sent to the process's group unless one of the fol-
> lowing special cases apply: If the reading process is ignoring or block-
> ing the SIGTTIN signal, or if the process group of the reading process is
> orphaned, the read(2) returns -1 with errno set to EIO and no signal is
> sent. The default action of the SIGTTIN signal is to stop the process to
> which it is sent.
>
> I output the process-attributes of the started process, and note tpgid
> (ID of foreground process group on the process’s tty) and tty:
>
> - p-c-t t
>
> attrs=((etime 0 0 7080 0) (start 23504 29912 167367 0) (nice . 0)
> (tpgid . 16419) (tty . ttys001) (pgrp . 16419) (ppid . 98669) (state
> . R) (comm . ldapsearch) (group . staff) (egid . 20) (user . fgunbin)
> (euid . 501))
>
> ldapsearch's pgrp=16419, it is using ttys001 for r/w, and it's in
> foreground process group on that tty (tpgid . 16419)
>
> - p-c-t nil
>
> attrs=((etime 0 0 6177 0) (start 23504 29897 662718 0) (nice . 0)
> (tpgid . 98669) (tty . ttys000) (pgrp . 16416) (ppid . 98669) (state
> . R) (comm . ldapsearch) (group . staff) (egid . 20) (user . fgunbin)
> (euid . 501))
>
> ldapsearch's pgrp=16416, it is using ttys000 for r/w (??), and it is
> NOT in foreground process group on that tty - (tpgid . 98669). 98669
> is emacs, and emacs is in foreground - this is ok.
>
> So the question is - why the process in the second case thinks that it
> has a tty? When it tries to use it, it receives SIGTTIN and is stopped,
> as termios man page says. My test case with p-c-t nil results in the
> processed being stopped, indeed.
Try the test case again but with the command "/usr/bin/tty" (with no
arguments).
For me (GNU/Linux, x86_64):
- p-c-t t
/dev/pts/51
Process my-process<4> finished
- p-c-t nil
not a tty
Process my-process<4> exited abnormally with code 1
(Meanwhile the test case hangs looking for the expected string until I
Ctrl-g it.)
Thomas
- bug#33050: 27.0.50; [macOS] Problem with process input with process-connection-type nil, Filipp Gunbin, 2018/10/15
- bug#33050: 27.0.50; [macOS] Problem with process input with process-connection-type nil, Eli Zaretskii, 2018/10/20
- bug#33050: 27.0.50; [macOS] Problem with process input with process-connection-type nil, Filipp Gunbin, 2018/10/22
- bug#33050: 27.0.50; [macOS] Problem with process input with process-connection-type nil, Thomas Fitzsimmons, 2018/10/22
- bug#33050: 27.0.50; [macOS] Problem with process input with process-connection-type nil, Filipp Gunbin, 2018/10/23
- bug#33050: 27.0.50; [macOS] Problem with process input with process-connection-type nil, Thomas Fitzsimmons, 2018/10/23
- bug#33050: 27.0.50; [macOS] Problem with process input with process-connection-type nil, Filipp Gunbin, 2018/10/24
- bug#33050: 27.0.50; [macOS] Problem with process input with process-connection-type nil, Filipp Gunbin, 2018/10/24
- bug#33050: 27.0.50; [macOS] Problem with process input with process-connection-type nil,
Thomas Fitzsimmons <=
- bug#33050: 27.0.50; [macOS] Problem with process input with process-connection-type nil, Filipp Gunbin, 2018/10/24
- bug#33050: 27.0.50; [macOS] Problem with process input with process-connection-type nil, Filipp Gunbin, 2018/10/24
- bug#33050: 27.0.50; [macOS] Problem with process input with process-connection-type nil, Thomas Fitzsimmons, 2018/10/24
- bug#33050: 27.0.50; [macOS] Problem with process input with process-connection-type nil, Filipp Gunbin, 2018/10/25
- bug#33050: 27.0.50; [macOS] Problem with process input with process-connection-type nil, Eli Zaretskii, 2018/10/25
- bug#33050: 27.0.50; [macOS] Problem with process input with process-connection-type nil, Filipp Gunbin, 2018/10/25
- bug#33050: 27.0.50; [macOS] Problem with process input with process-connection-type nil, Eli Zaretskii, 2018/10/25
- bug#33050: 27.0.50; [macOS] Problem with process input with process-connection-type nil, Filipp Gunbin, 2018/10/25
- bug#33050: 27.0.50; [macOS] Problem with process input with process-connection-type nil, Eli Zaretskii, 2018/10/25
- bug#33050: 27.0.50; [macOS] Problem with process input with process-connection-type nil, Filipp Gunbin, 2018/10/25