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From: Stephane Chazelas <stephane.chazelas@gmail.com>
To: Peter Stephenson <p.stephenson@samsung.com>
Cc: zsh-workers@zsh.org
Subject: Re: <(...), >(...) and fds above 9
Date: Mon, 1 Jul 2019 17:22:02 +0100	[thread overview]
Message-ID: <20190701162202.5o3cxahc75e2hucz@chaz.gmail.com> (raw)
In-Reply-To: <1561994908.6006.19.camel@samsung.com>

2019-07-01 16:28:28 +0100, Peter Stephenson:
[...]
> Looks like =(...) doesn't call closem() at all when
> forking, hence the difference in behaviour.  So
> =(...) is the odd one out.
[...]

But is there a good reason why we should close those fds?

I had to work around it in my case (something like:
join <(sort /dev/fd/$fd) <(sort /dev/fd/$fd2)
)


Another difference is that the stdin redirection to /dev/null is
not done for the =(...) form:

$ zsh -c 'cat =(ls -l /proc/self/fd)'
total 0
lrwx------ 1 stephane stephane 64 Jul  1 17:17 0 -> /dev/pts/13
l-wx------ 1 stephane stephane 64 Jul  1 17:17 1 -> /tmp/zshiMCdiC
lrwx------ 1 stephane stephane 64 Jul  1 17:17 2 -> /dev/pts/13
lr-x------ 1 stephane stephane 64 Jul  1 17:17 3 -> /proc/818/fd
$ zsh -c 'cat <(ls -l /proc/self/fd)'
total 0
lrwx------ 1 stephane stephane 64 Jul  1 17:17 0 -> /dev/null
l-wx------ 1 stephane stephane 64 Jul  1 17:17 1 -> pipe:[2995406]
lrwx------ 1 stephane stephane 64 Jul  1 17:17 2 -> /dev/pts/13
lr-x------ 1 stephane stephane 64 Jul  1 17:17 3 -> /proc/829/fd

-- 
Stephane

  reply	other threads:[~2019-07-01 16:22 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20190701100058epcas2p25e5f8dbd14d048fe2be1d831f3cf60ab@epcas2p2.samsung.com>
2019-07-01 10:00 ` Stephane Chazelas
2019-07-01 10:08   ` Peter Stephenson
2019-07-01 14:39     ` Bart Schaefer
2019-07-01 15:28       ` Peter Stephenson
2019-07-01 16:22         ` Stephane Chazelas [this message]
2019-07-01 16:52           ` Peter Stephenson
2019-07-01 17:00             ` Peter Stephenson
2019-07-01 20:00             ` Stephane Chazelas
2019-07-01 20:06               ` Bart Schaefer
2019-07-02  8:59             ` Peter Stephenson
2019-07-02 12:20               ` Stephane Chazelas
2019-07-02 13:12                 ` Peter Stephenson
2019-07-02 15:19                   ` Stephane Chazelas
2019-07-02 15:21                     ` Peter Stephenson
2019-07-02 16:43                 ` Sebastian Gniazdowski
2019-07-02 18:08                   ` Stephane Chazelas

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