From: Bart Schaefer <schaefer@brasslantern.com>
To: zsh-workers@zsh.org
Subject: Re: bug in zsh wait builtin - rhbz#1150541
Date: Tue, 21 Oct 2014 23:55:42 -0700 [thread overview]
Message-ID: <141021235542.ZM14840@torch.brasslantern.com> (raw)
In-Reply-To: <20141021210234.199eee3d@pws-pc.ntlworld.com>
On Oct 21, 9:02pm, Peter Stephenson wrote:
}
} There's an explanatory note in the latest POSIX standard about this,
} quoted below. It seems that the shell is basically required to remember
} all background processes indefinitely (up to not very helpful get out
} clauses). As a baseline, CHILD_MAX here is 1024. This probably needs
} to be a special hash.
Since you've bothered to look this up ... does it go on to say what the
shell is supposed to do if PIDs roll over so that a new background job
gets the same $! as some previous one? Is "kill" supposed to work the
same way? (Do we need to send an inquiry to austin-group? If so, you
will have to do it, my ability to post there has been messed up for a
long time.)
Note also that this is partly handled by the POSIX_JOBS option:
When the option is set, it becomes possible to use the wait
builtin to wait for the last job started in the background (as
given by $!) even if that job has already exited. This works even
if the option is turned on temporarily around the use of the wait
builtin.
I would say that any further change made for this should also be under
the auspices (so to speak) of POSIX_JOBS.
} Historical implementations of interactive shells have discarded the exit
} status of terminated background processes before each shell prompt.
Precisely. This is not a "bug," as zsh's implementation predates 2008.
It's a POSIX non-conformity, but zsh has quite a few of those remaining,
I think.
--
Barton E. Schaefer
next prev parent reply other threads:[~2014-10-22 6:56 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-21 7:53 Tim Speetjens
2014-10-21 20:02 ` Peter Stephenson
2014-10-22 6:55 ` Bart Schaefer [this message]
[not found] ` <CAO7vJOjrb=N3xuTJVSb7U8mdXtexYp8nN4YaoknfUb3fofU2zg@mail.gmail.com>
2014-10-22 15:48 ` Bart Schaefer
2014-10-22 18:32 ` Chet Ramey
2014-10-23 8:32 ` Peter Stephenson
2014-10-24 4:50 ` Bart Schaefer
2014-10-24 8:04 ` Tim Speetjens
2014-10-25 19:08 ` Peter Stephenson
2014-10-25 21:54 ` Bart Schaefer
2014-10-25 22:28 ` Bart Schaefer
2014-10-25 22:32 ` Bart Schaefer
2014-10-25 23:04 ` Peter Stephenson
2014-10-25 23:17 ` Peter Stephenson
2014-10-26 19:01 ` Peter Stephenson
2014-10-26 20:41 ` Bart Schaefer
2014-10-26 21:22 ` Peter Stephenson
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=141021235542.ZM14840@torch.brasslantern.com \
--to=schaefer@brasslantern.com \
--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).