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Re: SIGHUP on pty closure
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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