1 files changed, 45 insertions, 0 deletions
diff --git a/tests/tail-2/infloop-1.sh b/tests/tail-2/infloop-1.sh
new file mode 100755
index 000000000..3f45f7741
--- /dev/null
+++ b/tests/tail-2/infloop-1.sh
@@ -0,0 +1,45 @@
+#!/bin/sh
+# This test would fail with tail from pre-1.22i textutils.
+
+# Copyright (C) 1999-2012 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/>.
+
+. "${srcdir=.}/init.sh"; path_prepend_ ../src
+print_ver_ tail
+
+yes > t &
+yes_pid=$!
+while :; do
+  test -s t && break
+  sleep .1
+done
+tail -n 1 t &
+tail_pid=$!
+kill $yes_pid
+
+# This test is racy, and can fail under unusual circumstances.
+# On a very busy system, tail will fail to notice that $yes_pid is gone.
+# Then the following kill will succeed and cause this test to fail.
+
+# Wait for up to 3 seconds for tail to detect the death of $yes_pid.
+for i in $(seq 30); do
+    kill -0 $tail_pid || break
+    echo sleep 0.1s
+    sleep .1
+done
+
+kill $tail_pid && fail=1 || :
+
+Exit $fail