1 files changed, 49 insertions, 0 deletions
diff --git a/tests/tail-2/pid.sh b/tests/tail-2/pid.sh
new file mode 100755
index 0000000..407b90b
--- /dev/null
+++ b/tests/tail-2/pid.sh
@@ -0,0 +1,49 @@
+#!/bin/sh
+# Test the --pid option of tail.
+
+# Copyright (C) 2003-2020 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
+getlimits_
+
+touch empty here || framework_failure_
+
+# Terminate any background tail process
+cleanup_() { kill $pid 2>/dev/null && wait $pid; }
+
+for mode in '' '---disable-inotify'; do
+  # Use tail itself to create a background process to monitor,
+  # which will auto exit when "here" is removed.
+  tail -f $mode here & pid=$!
+
+  # Ensure that tail --pid=PID does not exit when PID is alive.
+  returns_ 124 timeout 1 tail -f -s.1 --pid=$pid $mode here || fail=1
+
+  cleanup_
+
+  # Ensure that tail --pid=PID exits with success status when PID is dead.
+  # Use an unlikely-to-be-live PID
+  timeout 10 tail -f -s.1 --pid=$PID_T_MAX $mode empty
+  ret=$?
+  test $ret = 124 && skip_ "pid $PID_T_MAX present or tail too slow"
+  test $ret = 0 || fail=1
+
+  # Ensure tail doesn't wait for data when PID is dead
+  returns_ 124 timeout 10 tail -f -s10 --pid=$PID_T_MAX $mode empty && fail=1
+done
+
+Exit $fail