From: Bart Schaefer <schaefer@brasslantern.com>
To: Ayappan P2 <ayappap2@in.ibm.com>
Cc: "zsh-workers@zsh.org" <zsh-workers@zsh.org>
Subject: Re: zsh testcase hangs in AIX
Date: Tue, 30 Jul 2019 11:25:15 -0700 [thread overview]
Message-ID: <CAH+w=7aRs_0+gcTGy7LDRgbBXBX2Lx157o0J4OAgaLEF4=W8aA@mail.gmail.com> (raw)
In-Reply-To: <OFCF3AC7E7.E703D5E1-ON00258447.0050768E-65258447.00511EB2@notes.na.collabserv.com>
On Tue, Jul 30, 2019 at 7:47 AM Ayappan P2 <ayappap2@in.ibm.com> wrote:
>
> We are porting zsh 5.5.1 in AIX.
Why not 5.7.1, the more recent release?
> Any help would be great.
This is testing the coprocess, which uses pipe() and then dups the
resulting descriptors before forking a child process. This means
there is a situation where you have two-way communication between the
parent and child, so if there is either insufficient buffer space [so
write() blocks] or the buffers are not flushed [so read() blocks] then
the exchange can deadlock. The test is assuming that pipes have more
than 12 bytes of buffering but are flushed at least on a line-by-line
basis.
prev parent reply other threads:[~2019-07-30 18:26 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-30 14:46 Ayappan P2
2019-07-30 18:25 ` Bart Schaefer [this message]
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