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Fix exit status of xzgrep when grepping binary files.

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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.
This commit is contained in:
Lasse Collin 2012-02-22 14:02:34 +02:00
parent 41cafb2bf9
commit cff070aba6
1 changed files with 2 additions and 1 deletions
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3
src/scripts/xzgrep.in
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@ -195,7 +195,8 @@ for i; do
fi >&3 5>&-
)
r=$?
test "$xz_status" -eq 0 || test "$xz_status" -eq 2 || r=2
test "$xz_status" -eq 0 || test "$xz_status" -eq 2 \
|| test "$(kill -l "$xz_status" 2> /dev/null)" = "PIPE" || r=2
test $res -lt $r && res=$r
done
exit $res