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#!/bin/sh
# ensure that tail -f doesn't hang in various cases
# Copyright (C) 2009-2022 Free Software Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
print_ver_ tail test head
trap_sigpipe_or_skip_
# Speedup the non inotify case
fastpoll='-s.1 --max-unchanged-stats=1'
for mode in '' '---disable-inotify'; do
# Ensure :|tail -f doesn't hang, per POSIX
echo oo > exp || framework_failure_
echo foo | timeout 10 tail -f $mode $fastpoll -c3 > out || fail=1
compare exp out || fail=1
cat <<\EOF > exp || framework_failure_
==> standard input <==
ar
EOF
echo bar | returns_ 1 \
timeout 10 tail -f $mode $fastpoll -c3 - missing > out || fail=1
compare exp out || fail=1
# This would wait indefinitely before v8.28 due to no EPIPE being
# generated due to no data written after the first small amount.
# Also check tail exits if SIGPIPE is being ignored.
# Note 'trap - SIGPIPE' is ineffective if the initiating shell
# has ignored SIGPIPE, but that's not the normal case.
for disposition in '' '-'; do
(trap "$disposition" PIPE;
returns_ 124 timeout 10 \
tail -n2 -f $mode $fastpoll out && touch timed_out) |
head -n2 > out2
test -e timed_out && fail=1
compare exp out2 || fail=1
rm -f timed_out
done
# This would wait indefinitely before v8.28 (until first write)
# test -w /dev/stdout is used to check that >&- is effective
# which was seen not to be the case on NetBSD 7.1 / x86_64:
if env test -w /dev/stdout >/dev/null &&
env test ! -w /dev/stdout >&-; then
(returns_ 1 timeout 10 tail -f $mode $fastpoll /dev/null >&-) || fail=1
fi
done
Exit $fail
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