commit cff070aba6281ba743d29a62b8c0c66e5da4b2a6
author Lasse Collin <lasse.collin@tukaani.org> Wed Feb 22 14:02:34 2012 +0200
committer Lasse Collin <lasse.collin@tukaani.org> Wed Feb 22 14:02:34 2012 +0200
tree 2af7250c1d46376584eef166b649a69a694cfd1d
parent 41cafb2bf9beea915710ee68f05fe929cd17759c

Fix exit status of xzgrep when grepping binary files.

When grepping binary files, grep may exit before it has
read all the input. In this case, gzip -q returns 2 (eating
SIGPIPE), but xz and bzip2 show SIGPIPE as the exit status
(e.g. 141). This causes wrong exit status when grepping
xz- or bzip2-compressed binary files.

The fix checks for the special exit status that indicates SIGPIPE.
It uses kill -l which should be supported everywhere since it
is in both SUSv2 (1997) and POSIX.1-2008.

Thanks to James Buren for the bug report.