Date: Mon, 25 Jul 2011 11:04:55 -0400
From: Christopher Faylor <cgf-use-the-mailinglist-please AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: SIGHUP on pty closure
Message-ID: <20110725150455.GB1040@ednor.casa.cgf.cx>
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On Mon, Jul 25, 2011 at 01:45:22PM +0200, Marco atzeri wrote:
>On 7/25/2011 1:14 PM, Corinna Vinschen wrote:
>> On Jul 25 12:36, Marco atzeri wrote:
>>> It seems that mc is correct in the expectation.
>>>
>>> http://pubs.opengroup.org/onlinepubs/9699919799/functions/close.html
>>>
>>> "If fildes refers to the master side of a pseudo-terminal, and this
>>> is the last close, a SIGHUP signal shall be sent to the controlling
>>> process, if any, for which the slave side of the pseudo-terminal is
>>> the controlling terminal. It is unspecified whether closing the
>>> master side of the pseudo-terminal flushes all queued input and
>>> output."
>>>
>>>
>>> I don't find such implementation on cygwin
>>>
>>> fhandler_pty_master::close ()
>>>
>>> Am I looking in the wrong place ?
>>
>> No, I don't think so.  I'm not fluent with mc.  How can I reproduce
>> the issue?
>>
>>
>> Corinna
>>
>
>
>$ mc -U  (to run mc with subshell)
>
>pres CTRL-O (to swith on subshell)
>
>$ ps ax
>       PID    PPID    PGID     WINPID  TTY  UID    STIME COMMAND
>      1112       1    1112       1112    ? 1006 13:42:30 /usr/bin/mintty
>       556    1112     556       5860    3 1006 13:42:30 /usr/bin/bash
>      5048     556    5048       2720    3 1006 13:43:00 /usr/bin/mc
>      2820    5048    2820       2064    0 1006 13:43:00 /usr/bin/bash
>       460    2820     460       5980    0 1006 13:43:04 /usr/bin/ps
>
>
>press CTRL-O (to return on mc)
>
>F10 (to exit from mc)
>
>the subshell remains open
>
>$ ps ax
>       PID    PPID    PGID     WINPID  TTY  UID    STIME COMMAND
>      1112       1    1112       1112    ? 1006 13:42:30 /usr/bin/mintty
>       556    1112     556       5860    3 1006 13:42:30 /usr/bin/bash
>I    2820       1    2820       2064    0 1006 13:43:00 /usr/bin/bash
>      2968     556    2968       5096    3 1006 13:43:42 /usr/bin/ps
>
>sending the SIGHUP
>$ kill -SIGHUP 2820
>
>$ ps ax
>       PID    PPID    PGID     WINPID  TTY  UID    STIME COMMAND
>      1112       1    1112       1112    ? 1006 13:42:30 /usr/bin/mintty
>       556    1112     556       5860    3 1006 13:42:30 /usr/bin/bash
>      5344     556    5344       4804    3 1006 13:44:06 /usr/bin/ps
>
>the subshell closes.

Since I was the person who insisted that this "mc bug" be fixed, I'll
take a look at fixing this unless Corinna has already beaten me to it.

cgf

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