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From:	Helmut Karlowski <helmut DOT karlowski AT ish DOT de>
To:	cygwin AT cygwin DOT com
Cc:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
Subject:	Re: opendir(/dev/fd/n) should fail
In-Reply-To:	<20150123094322.GA5612@calimero.vinschen.de>
References:	<op DOT xsv0ekzkofd6j1 AT nebbiolo DOT upc DOT de> <20150123094322 DOT GA5612 AT calimero DOT vinschen DOT de>
Date:	Fri, 23 Jan 2015 10:54:30 +0100
Message-Id:	<20150123105430.210869D0.helmut.karlowski@ish.de>
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--------------------------------------------------
Corinna Vinschen <corinna-cygwin AT cygwin DOT com> wrote:
(23/01/2015 10:43)

> > numerous entries ...
> 
> This occurs on Linux as well, just with a few less entries in
> fd (42 rather than 560).  These descriptors are apparently
> created by bash for some reason I don't know, and our bash seems
> to create some more descriptors than the newler bash on Linux.

It's not just bash. The same happens in my home-grown shell. Starting 
with /dev/fd/3 opendir succeeds giving (only the opendir-entries):

[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/0/',prefix_len=12,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/1/',prefix_len=12,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/2/',prefix_len=12,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/',prefix_len=12,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/0/',prefix_len=14,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/1/',prefix_len=14,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/2/',prefix_len=14,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/3/',prefix_len=14,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/3/0/',prefix_len=16,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/3/1/',prefix_len=16,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/3/2/',prefix_len=16,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/3/3/',prefix_len=16,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/3/3/0/',prefix_len=18,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/3/3/1/',prefix_len=18,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/3/3/2/',prefix_len=18,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/3/3/3/',prefix_len=18,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/3/3/3/0/',prefix_len=20,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/3/3/3/1/',prefix_len=20,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/3/3/3/2/',prefix_len=20,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/3/3/3/3/',prefix_len=20,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/3/3/3/3/0/',prefix_len=22,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/3/3/3/3/1/',prefix_len=22,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/3/3/3/3/2/',prefix_len=22,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/3/3/3/3/3/',prefix_len=22,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/3/3/3/3/3/0/',prefix_len=24,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/3/3/3/3/3/1/',prefix_len=24,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/3/3/3/3/3/2/',prefix_len=24,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/3/3/3/3/3/3/',prefix_len=24,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/3/3/3/3/3/3/0/',prefix_len=26,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/3/3/3/3/3/3/1/',prefix_len=26,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/3/3/3/3/3/3/2/',prefix_len=26,hasdot=0,fignore=484444:''
[ 752:3] 
globit:ksh_opendir:'/dev/fd/3/3/3/3/3/3/3/3/3/',prefix_len=26,hasdot=0,fignore=484444:

...

Linux seems to have  has a similar bug.

-Helmut

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