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

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

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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