SIGHUP on pty closure

Mon Jul 25 11:45:00 GMT 2011

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.
Regards
Marco
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