1 files changed, 69 insertions, 0 deletions
diff --git a/tests/tail-2/inotify-race.sh b/tests/tail-2/inotify-race.sh
new file mode 100755
index 000000000..ab25f67d0
--- /dev/null
+++ b/tests/tail-2/inotify-race.sh
@@ -0,0 +1,69 @@
+#!/bin/sh
+# Ensure that tail does not ignore data that is appended to a tailed-forever
+# file between tail's initial read-to-EOF, and when the inotify watches
+# are established in tail_forever_inotify.  That data could be ignored
+# indefinitely if no *other* data is appended, but it would be printed as
+# soon as any additional appended data is detected.
+
+# Copyright (C) 2009-2012 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 <http://www.gnu.org/licenses/>.
+
+. "${srcdir=.}/init.sh"; path_prepend_ ../src
+print_ver_ tail
+
+# Don't run this test by default because sometimes it's skipped as noted below.
+# Also gdb has a bug in Debian's gdb-6.8-3 at least that causes it to not
+# cleanup and exit correctly when it receives a SIGTERM, thus hanging the test.
+very_expensive_
+
+touch file || framework_failure_
+touch tail.out || framework_failure_
+
+( timeout 10s gdb --version ) > gdb.out 2>&1
+case $(cat gdb.out) in
+    *'GNU gdb'*) ;;
+    *) skip_ "can't run gdb";;
+esac
+
+# See if gdb works and
+# tail_forever_inotify is compiled and not inlined
+timeout 10s gdb -nx --batch-silent                 \
+    --eval-command='break tail_forever_inotify'    \
+    --eval-command='run -f file'                   \
+    --eval-command='quit'                          \
+    tail < /dev/null > gdb.out 2>&1
+
+# FIXME: The above is seen to _intermittently_ fail with:
+# warning: .dynamic section for "/lib/libc.so.6" is not at the expected address
+# warning: difference appears to be caused by prelink, adjusting expectations
+test -s gdb.out && { cat gdb.out; skip_ "can't set breakpoints in tail"; }
+
+# Run "tail -f file", stopping to append a line just before
+# inotify initialization, and then continue.  Before the fix,
+# that just-appended line would never be output.
+timeout 10s gdb -nx --batch-silent                 \
+    --eval-command='break tail_forever_inotify'    \
+    --eval-command='run -f file >> tail.out'       \
+    --eval-command="shell echo never-seen-with-tail-7.5 >> file" \
+    --eval-command='continue'                      \
+    --eval-command='quit'                          \
+    tail < /dev/null > /dev/null 2>&1 &
+pid=$!
+
+tail --pid=$pid -f tail.out | (read; kill $pid)
+
+test -s tail.out || fail=1
+
+Exit $fail