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#!/bin/sh
# Test tail -f -
# Copyright (C) 2009-2020 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
#################
# tail -f - would fail with the initial inotify implementation
check_tail_output()
{
local delay="$1"
grep "$tail_re" out ||
{ sleep $delay; return 1; }
}
# Terminate any background tail process
cleanup_() { kill $pid 2>/dev/null && wait $pid; }
# Speedup the non inotify case
fastpoll='-s.1 --max-unchanged-stats=1'
echo line > in || framework_failure_
echo line > exp || framework_failure_
for mode in '' '---disable-inotify'; do
> out || framework_failure_
tail $mode -f $fastpoll < in > out 2> err & pid=$!
# Wait up to 12.7s for output to appear:
tail_re='line' retry_delay_ check_tail_output .1 7 ||
{ echo "$0: a: unexpected delay?"; cat out; fail=1; }
# Ensure there was no error output.
compare /dev/null err || fail=1
cleanup_
done
#################
# Before coreutils-8.26 this would induce an UMR under UBSAN
returns_ 1 timeout 10 tail -f - <&- 2>errt || fail=1
cat <<\EOF >exp || framework_failure_
tail: cannot fstat 'standard input'
tail: error reading 'standard input'
tail: no files remaining
tail: -
EOF
sed 's/\(tail:.*\):.*/\1/' errt > err || framework_failure_
compare exp err || fail=1
#################
# Before coreutils-8.28 this would erroneously issue a warning
if tty -s </dev/tty && test -t 0; then
for input in '' '-' '/dev/tty'; do
returns_ 124 timeout 0.1 tail -f $input 2>err || fail=1
compare /dev/null err || fail=1
done
tail -f - /dev/null </dev/tty 2> out & pid=$!
# Wait up to 12.7s for output to appear:
tail_re='ineffective' retry_delay_ check_tail_output .1 7 ||
{ cat out; fail=1; }
cleanup_
fi
Exit $fail
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