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Re: pipe
From: |
Daiki Ueno |
Subject: |
Re: pipe |
Date: |
Tue, 17 Mar 2015 16:22:07 +0900 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) |
Eli Zaretskii <address@hidden> writes:
>> > But that means it would be impossible to invoke gpg from a shell that
>> > can redirect handles beyond the first 3, like some decent port of
>> > Bash, is that correct? Or is that where the wrapper comes into play,
>>
>> I don't know about a native Bash port to Windows. Using Cygwin with
>> native Windows programs is problematic has you probably know.
>
> I was thinking about MSYS Bash. But any port of Bash should do, as
> redirecting file handles for a sub-process is trivial.
Thanks for all the information. I'm almost lost :-)
Are the following assumptions correct?
- A subprocess on Windows is able to access a handle passed as an
external representation from the parent, as described in the first
example of:
https://msdn.microsoft.com/en-us/library/aa298531%28v=vs.60%29.aspx
- Some shells maintain the mappings between file descriptors and
handles, and if Emacs runs a shell program with a redirection to
non-standard file descriptors, it might not work as expected
- Emacs uses Gnulib's pipe2 implementation around _pipe on native
Windows and the returned file descriptors are actually a handle
If all of those are correct, perhaps we could just mention the fact that
the child ends of a pipe process is a handle on Windows?
In any case, supporting stderr could be a starting point, as it seems to
be a long-standing request:
https://lists.gnu.org/archive/html/emacs-devel/2004-04/msg01051.html
and it wouldn't involve a portability issue.
Regards,
--
Daiki Ueno
- pipe, Daiki Ueno, 2015/03/13
- Re: pipe, Eli Zaretskii, 2015/03/13
- Re: pipe, Daiki Ueno, 2015/03/13
- Re: pipe, Werner Koch, 2015/03/13
- Re: pipe, Eli Zaretskii, 2015/03/14
- Re: pipe, Werner Koch, 2015/03/14
- Re: pipe, Eli Zaretskii, 2015/03/14
- Re: pipe, Werner Koch, 2015/03/14
- Re: pipe, Eli Zaretskii, 2015/03/14
- Re: pipe,
Daiki Ueno <=
- Re: pipe, Eli Zaretskii, 2015/03/17
Re: pipe, Stefan Monnier, 2015/03/13
- Re: pipe, Daiki Ueno, 2015/03/13
- [PATCH] Generalize start-process with keyword args, Daiki Ueno, 2015/03/16
- Re: [PATCH] Generalize start-process with keyword args, Stefan Monnier, 2015/03/16
- Re: [PATCH] Generalize start-process with keyword args, Daiki Ueno, 2015/03/16
- Re: [PATCH] Generalize start-process with keyword args, Stefan Monnier, 2015/03/16
- Re: [PATCH] Generalize start-process with keyword args, Daiki Ueno, 2015/03/16
- Re: [PATCH] Generalize start-process with keyword args, Stefan Monnier, 2015/03/17
- Re: [PATCH] Generalize start-process with keyword args, Eli Zaretskii, 2015/03/17