GNU bug report logs - #17145
head fails with implicit stdin on darwin

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#17145: closed (head fails with implicit stdin on darwin)
Date: Wed, 02 Apr 2014 14:48:02 +0000

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Your message dated Wed, 02 Apr 2014 07:47:11 -0700
with message-id <533C22EF.1080201 <at> cs.ucla.edu>
and subject line Re: bug#17145: head fails with implicit stdin on darwin
has caused the debbugs.gnu.org bug report #17145,
regarding head fails with implicit stdin on darwin
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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From: Denis Excoffier <gcc <at> Denis-Excoffier.org>
To: bug-coreutils <at> gnu.org
Subject: head fails with implicit stdin on darwin
Date: Sun, 30 Mar 2014 22:40:18 +0200

Hello,

head -n -1 -- -
or equivalently
head -n -1
returns immediately (ie does not wait for further stdin) and prints nothing.

I use coreutils 8.22 compiled (with gcc-4.8.2) on top of darwin 13.1.0 (Mavericks).

However the following seem to work perfectly:
head -n 1
head -c -1
cat | head -n -1
head -n -1 ---presume-input-pipe
on cygwin: head -n -1

What is weird on my system is lseek() at the beginning of elide_tail_lines_file():
lseek(fd, 0, SEEK_CUR) returns a (random?) number, something like 6735, 539 etc.
lseek(fd, 0, SEEK_END) returns 0

Hope this helps,

Regards,

Denis Excoffier.

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Pádraig Brady <P <at> draigBrady.com>
Cc: 17145-done <at> debbugs.gnu.org, Denis Excoffier <gcc <at> Denis-Excoffier.org>
Subject: Re: bug#17145: head fails with implicit stdin on darwin
Date: Wed, 02 Apr 2014 07:47:11 -0700

Pádraig Brady wrote:
> s/if/else if/

Thanks.  Or better yet, return false if fstat fails.  I did that, plus 
the other changes you and Bernhard suggested, and installed the patch.

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