1#!/bin/sh 2# inotify-based tail -f didn't flush its initial output before blocking 3 4# Copyright (C) 2009-2023 Free Software Foundation, Inc. 5 6# This program is free software: you can redistribute it and/or modify 7# it under the terms of the GNU General Public License as published by 8# the Free Software Foundation, either version 3 of the License, or 9# (at your option) any later version. 10 11# This program is distributed in the hope that it will be useful, 12# but WITHOUT ANY WARRANTY; without even the implied warranty of 13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14# GNU General Public License for more details. 15 16# You should have received a copy of the GNU General Public License 17# along with this program. If not, see <https://www.gnu.org/licenses/>. 18 19. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src 20print_ver_ tail 21 22# Speedup the non inotify case 23fastpoll='-s.1 --max-unchanged-stats=1' 24 25# Terminate any background tail process 26cleanup_() { kill $pid 2>/dev/null && wait $pid; } 27 28echo line > in || framework_failure_ 29# Output should be buffered since we're writing to file 30# so we're depending on the flush to write out 31tail $fastpoll -f in > out & pid=$! 32 33# Wait for 3.1s for the file to be flushed. 34tail_flush() 35{ 36 local delay="$1" 37 sleep $delay 38 test -s out 39} 40retry_delay_ tail_flush .1 5 || fail=1 41 42cleanup_ 43 44Exit $fail 45