Date: Mon, 10 Mar 2003 18:19:54 -0600 From: Larry Rosenman <ler@lerctr.org> To: Poul-Henning Kamp <phk@phk.freebsd.dk>, Conrad Sabatier <conrads@cox.net> Cc: freebsd-current@FreeBSD.ORG, freebsd-ports@FreeBSD.ORG Subject: Re: bash2 or devfs problem? Message-ID: <13630000.1047341994@lerlaptop.iadfw.net> In-Reply-To: <5257.1047339488@critter.freebsd.dk> References: <5257.1047339488@critter.freebsd.dk>
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--On Tuesday, March 11, 2003 00:38:08 +0100 Poul-Henning Kamp
<phk@phk.freebsd.dk> wrote:
> In message <XFMail.20030310155011.conrads@cox.net>, Conrad Sabatier
> writes:
>> I've noticed that bash's process substitution fails under -CURRENT.
>>
>> For (an admittedly stupid, trivial) example:
>>
>> diff <(cat file1) <(cat file2)
>>
>> errors out with:
>>
>> diff: /dev/fd/63: No such file or directory
>> diff: /dev/fd/62: No such file or directory
>>
>> Apparently, the nodes for the named pipes are not being created as they
>> should.
>>
>> Is this a bash problem, or something in devfs not working as expected?
>
> That's a good question...
>
> Has anybody found out what the standards conformant thing is for /dev/fd ?
>
> presently we do only 0,1 & 2, with the std{in,out,err} symlinks.
>
> If we are required to do all filedescriptors, we should do so with
> fdescfs by default.
It is supposed to (based on MY reading of the fd(4) man page on a UnixWare
(SysVr5) system)
be ALL filedescriptors.
this paragraph seems to be the cogent part:
These files, conventionally called /dev/fd/0, /dev/fd/1, /dev/fd/2,
and so on, refer to files accessible through file descriptors. If file
descriptor n is open, these two system calls have the same effect:
fd = open("/dev/fd/n",mode);
fd = dup(n);
The full manpage is visible at:
http://www.lerctr.org:8458/en/man/html.4/fd.4.html
LER
>
> --
> Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
> phk@FreeBSD.ORG | TCP/IP since RFC 956
> FreeBSD committer | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by
> incompetence.
>
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--
Larry Rosenman http://www.lerctr.org/~ler
Phone: +1 972-414-9812 E-Mail: ler@lerctr.org
US Mail: 1905 Steamboat Springs Drive, Garland, TX 75044-6749
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