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) 2009-2015 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 <http://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 echo line > in || framework_failure_
  26 # Output should be buffered since we're writing to file
  27 # so we're depending on the flush to write out
  28 tail $fastpoll -f in > out & tail_pid=$!
  29
  30 # Wait for 3.1s for the file to be flushed.
  31 tail_flush()
  32 {
  33   local delay="$1"
  34
  35   test -s out ||
  36     { sleep "$delay"; return 1; }
  37 }
  38 retry_delay_ tail_flush .1 5 || fail=1
  39
  40 kill $tail_pid
  41
  42 wait $tail_pid
  43
  44 Exit $fail