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#!/bin/sh
# Demonstrate the disk-filling infloop when redirecting to an input file.
. "${srcdir=.}/init.sh"; path_prepend_ ../src
require_timeout_
# Use an input file large enough that the problem is reproducible in spite
# of buffering effects. Just larger than 256KB should be adequate.
v=$(printf %063d 0)'
'
# 64 * 2^12 = 256k
for i in 1 2 3 4 5 6 7 8 9 10 11 12; do
v="$v$v"
done
echo "$v" > out || framework_failure_
echo 'grep: input file `out'\'' is also the output' \
> err.exp || framework_failure_
# Require an exit status of 2.
# grep-2.8 and earlier would infloop.
timeout 10 grep 0 out >> out 2> err; st=$?
test $st = 2 || fail=1
compare err.exp err || fail=1
# But with each of the following options it must not exit-2.
for i in -q -m1 -l -L; do
timeout 10 grep $i 0 out >> out 2> err; st=$?
test $st = 2 && fail=1
done
timeout 10 grep -2 0 out >> out 2> err; st=$?
test $st = 2 || fail=1
Exit $fail
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