From: Martin Vaeth <vaeth@mathematik.uni-wuerzburg.de>
To: zsh-workers@zsh.org
Subject: Re: PATCH: Util/helpfiles failing on old-fashioned unix
Date: Wed, 18 Dec 2013 08:39:24 +0000 (UTC) [thread overview]
Message-ID: <slrnlb2nq7.ojt.vaeth@lounge.imp.fu-berlin.de> (raw)
In-Reply-To: <20131215233752.GA3644@ma.sdf.org>
pda@sdf.org <pda@sdf.org> wrote:
> Looking more closely
> at how perl opens a pipe, I see it seems to always succeed, even when
> the pipe components fail.
I suppose perl just checks the call of the shell (and whether
the redirection succeeeded) which means that, usually, an open with
a pipe redirection succeeds fully (including the "close") if
the *last* command of that pipe succeeded.
> Looks like testing for emptiness of the file handle would do the trick.
I doubt that perl has any means to get this information after a call
to the shell. Moreover, filehandles in perl are very abstract objects
(even more in perl{3,4}); you probably cannot get a useful string
representation of it which has any meaning. I recall that, in another
context, even with perl5 and its filehandle *variables* I did not find
a proper way to find out the "succeess" from the handle, only (and I
had tried some tricks with "ref" and "defined" but perl's
autovivification seems to make the handle "well-behaved" just because
it was *used* in a call to open - even if that call failed).
However, with the code I had attached all these problems should
not occur since it uses "system" only instead of "open".
next prev parent reply other threads:[~2013-12-18 8:40 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-10 8:57 Install run-help and *.zwc files system wide in build system Martin Vaeth
2013-11-10 18:13 ` Peter Stephenson
2013-11-10 22:28 ` Martin Vaeth
2013-11-11 2:30 ` Bart Schaefer
2013-11-11 9:09 ` Martin Vaeth
2013-11-11 16:42 ` Bart Schaefer
2013-11-11 22:59 ` Martin Vaeth
2013-11-12 10:11 ` Peter Stephenson
2013-11-12 17:41 ` Martin Vaeth
2013-11-12 17:48 ` Peter Stephenson
2013-11-12 21:04 ` Peter Stephenson
2013-11-12 21:42 ` Martin Vaeth
2013-11-13 9:28 ` Peter Stephenson
2013-11-13 10:10 ` Martin Vaeth
2013-11-13 11:21 ` Peter Stephenson
2013-11-13 16:06 ` Bart Schaefer
2013-11-16 12:14 ` modify functions hierarchy (was: Install run-help and *.zwc files system wide in build system) Martin Vaeth
2013-11-17 18:30 ` Bart Schaefer
2013-11-17 19:42 ` Martin Vaeth
2013-11-17 21:01 ` Bart Schaefer
2013-11-18 7:00 ` Martin Vaeth
2013-11-18 16:11 ` Doc/Doc/help (was: modify functions hierarchy (was: Install run-help and *.zwc files system wide in build system)) Bart Schaefer
2013-11-18 16:23 ` Peter Stephenson
2013-11-18 16:31 ` Bart Schaefer
2013-11-18 16:36 ` Peter Stephenson
2013-11-18 16:45 ` Bart Schaefer
2013-11-18 16:58 ` Peter Stephenson
2013-11-20 19:26 ` modify functions hierarchy (was: Install run-help and *.zwc files system wide in build system) Peter Stephenson
2013-11-21 6:01 ` Bart Schaefer
2013-11-23 17:48 ` Peter Stephenson
2013-11-23 19:47 ` Helpfiles again (was Re: modify functions hierarchy (was: etc.)) Bart Schaefer
2013-11-23 21:25 ` Martin Vaeth
2013-11-24 5:06 ` Bart Schaefer
[not found] ` <20131124175649.27c2559a@pws!>
2013-11-24 12:26 ` Martin Vaeth
2013-11-24 12:31 ` Martin Vaeth
2013-11-24 17:56 ` Peter Stephenson
2013-11-25 8:18 ` Bart Schaefer
2013-11-25 14:24 ` Jun T.
2013-11-25 15:49 ` Peter Stephenson
2013-11-25 16:56 ` Bart Schaefer
2013-11-25 17:37 ` Peter Stephenson
2013-11-25 20:14 ` Phil Pennock
2013-11-26 9:24 ` Peter Stephenson
2013-12-12 22:17 ` PATCH: Util/helpfiles failing on old-fashioned unix pda
2013-12-13 9:08 ` Martin Vaeth
2013-12-13 23:46 ` Martin Vaeth
2013-12-14 0:20 ` Wayne Davison
2013-12-14 9:23 ` Martin Vaeth
2013-12-14 18:49 ` Bart Schaefer
2013-12-15 23:37 ` pda
2013-12-18 8:39 ` Martin Vaeth [this message]
2013-11-17 20:13 ` modify functions hierarchy (was: Install run-help and *.zwc files system wide in build system) Peter Stephenson
2013-11-17 20:50 ` Bart Schaefer
2013-11-18 7:57 ` Martin Vaeth
2013-11-18 16:28 ` Bart Schaefer
2013-11-18 10:32 ` Peter Stephenson
2013-11-18 16:38 ` Bart Schaefer
2013-11-18 16:50 ` Peter Stephenson
2013-11-12 21:52 ` Install run-help and *.zwc files system wide in build system Martin Vaeth
2013-11-13 1:13 ` Bart Schaefer
2013-11-13 2:40 ` Bart Schaefer
2013-11-13 13:30 ` [PATCH] helpfiles: Also accept 'UTF-8' as an encoding name Jun T.
2013-11-13 15:37 ` Jun T.
2013-11-13 16:56 ` Martin Vaeth
2013-11-13 17:27 ` Bart Schaefer
2013-11-13 18:28 ` Martin Vaeth
2013-11-14 0:06 ` Phil Pennock
2013-11-14 7:50 ` Martin Vaeth
2013-11-14 8:18 ` Phil Pennock
2013-11-14 11:11 ` Martin Vaeth
2013-11-15 14:58 ` Jun T.
2013-11-15 17:16 ` Bart Schaefer
2013-11-15 19:58 ` Martin Vaeth
2013-11-16 5:51 ` Bart Schaefer
2013-11-16 15:17 ` Jun T.
2013-11-16 18:05 ` Bart Schaefer
2013-11-18 18:43 ` Phil Pennock
2013-11-10 22:44 ` Install run-help and *.zwc files system wide in build system Martin Vaeth
2013-11-10 18:56 ` Bart Schaefer
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=slrnlb2nq7.ojt.vaeth@lounge.imp.fu-berlin.de \
--to=vaeth@mathematik.uni-wuerzburg.de \
--cc=zsh-workers@zsh.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.vuxu.org/mirror/zsh/
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).