tests/tail-2/flush-initial.sh

   1 #!/bin/sh
   2 # inotify-based tail -f didn't flush its initial output before blocking
   3
   4 # Copyright (C) 2009-2022 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
  20 print_ver_ tail
  21
  22 # Speedup the non inotify case
  23 fastpoll='-s.1 --max-unchanged-stats=1'
  24
  25 # Terminate any background tail process
  26 cleanup_() { kill $pid 2>/dev/null && wait $pid; }
  27
  28 echo 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
  31 tail $fastpoll -f in > out & pid=$!
  32
  33 # Wait for 3.1s for the file to be flushed.
  34 tail_flush()
  35 {
  36   local delay="$1"
  37   sleep $delay
  38   test -s out
  39 }
  40 retry_delay_ tail_flush .1 5 || fail=1
  41
  42 cleanup_
  43
  44 Exit $fail