tests/tail-2/inotify-race

   1 #!/bin/sh
   2 # Ensure that tail does not ignore data that is appended to a tailed-forever
   3 # file between tail's initial read-to-EOF, and when the inotify watches
   4 # are established in tail_forever_inotify.  That data could be ignored
   5 # indefinitely if no *other* data is appended, but it would be printed as
   6 # soon as any additional appended data is detected.
   7
   8 # Copyright (C) 2009-2011 Free Software Foundation, Inc.
   9
  10 # This program is free software: you can redistribute it and/or modify
  11 # it under the terms of the GNU General Public License as published by
  12 # the Free Software Foundation, either version 3 of the License, or
  13 # (at your option) any later version.
  14
  15 # This program is distributed in the hope that it will be useful,
  16 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 # GNU General Public License for more details.
  19
  20 # You should have received a copy of the GNU General Public License
  21 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 . "${srcdir=.}/init.sh"; path_prepend_ ../src
  24 print_ver_ tail
  25
  26 # Don't run this test by default because sometimes it's skipped as noted below.
  27 # Also gdb has a bug in Debian's gdb-6.8-3 at least that causes it to not
  28 # cleanup and exit correctly when it receives a SIGTERM, thus hanging the test.
  29 very_expensive_
  30
  31 touch file || framework_failure_
  32 touch tail.out || framework_failure_
  33
  34 ( timeout 10s gdb --version ) > gdb.out 2>&1
  35 case $(cat gdb.out) in
  36     *'GNU gdb'*) ;;
  37     *) skip_ "can't run gdb";;
  38 esac
  39
  40 # See if gdb works and
  41 # tail_forever_inotify is compiled and not inlined
  42 timeout 10s gdb -nx --batch-silent                 \
  43     --eval-command='break tail_forever_inotify'    \
  44     --eval-command='run -f file'                   \
  45     --eval-command='quit'                          \
  46     tail < /dev/null > gdb.out 2>&1
  47
  48 # FIXME: The above is seen to _intermittently_ fail with:
  49 # warning: .dynamic section for "/lib/libc.so.6" is not at the expected address
  50 # warning: difference appears to be caused by prelink, adjusting expectations
  51 test -s gdb.out && { cat gdb.out; skip_ "can't set breakpoints in tail"; }
  52
  53 # Run "tail -f file", stopping to append a line just before
  54 # inotify initialization, and then continue.  Before the fix,
  55 # that just-appended line would never be output.
  56 timeout 10s gdb -nx --batch-silent                 \
  57     --eval-command='break tail_forever_inotify'    \
  58     --eval-command='run -f file >> tail.out'       \
  59     --eval-command="shell echo never-seen-with-tail-7.5 >> file" \
  60     --eval-command='continue'                      \
  61     --eval-command='quit'                          \
  62     tail < /dev/null > /dev/null 2>&1 &
  63 pid=$!
  64
  65 tail --pid=$pid -f tail.out | (read; kill $pid)
  66
  67 test -s tail.out || fail=1
  68
  69 Exit $fail