1 files changed, 44 insertions, 0 deletions
diff --git a/tests/tail-2/flush-initial.sh b/tests/tail-2/flush-initial.sh
new file mode 100755
index 0000000..fb9e79b
--- /dev/null
+++ b/tests/tail-2/flush-initial.sh
@@ -0,0 +1,44 @@
+#!/bin/sh
+# inotify-based tail -f didn't flush its initial output before blocking
+
+# Copyright (C) 2009-2022 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 <https://www.gnu.org/licenses/>.
+
+. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
+print_ver_ tail
+
+# Speedup the non inotify case
+fastpoll='-s.1 --max-unchanged-stats=1'
+
+# Terminate any background tail process
+cleanup_() { kill $pid 2>/dev/null && wait $pid; }
+
+echo line > in || framework_failure_
+# Output should be buffered since we're writing to file
+# so we're depending on the flush to write out
+tail $fastpoll -f in > out & pid=$!
+
+# Wait for 3.1s for the file to be flushed.
+tail_flush()
+{
+  local delay="$1"
+  sleep $delay
+  test -s out
+}
+retry_delay_ tail_flush .1 5 || fail=1
+
+cleanup_
+
+Exit $fail