1 files changed, 45 insertions, 0 deletions
diff --git a/tests/misc/tac-2-nonseekable.sh b/tests/misc/tac-2-nonseekable.sh
new file mode 100755
index 0000000..38c82a8
--- /dev/null
+++ b/tests/misc/tac-2-nonseekable.sh
@@ -0,0 +1,45 @@
+#!/bin/sh
+# ensure that tac works with non-seekable or quasi-seekable inputs
+
+# Copyright (C) 2011-2022 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_ tac
+
+echo x | tac - - > out 2> err || fail=1
+echo x > exp || framework_failure_
+compare exp out || fail=1
+compare /dev/null err || fail=1
+
+# Make sure it works on funny files in /proc and /sys.
+
+for file in /proc/version /sys/kernel/profiling; do
+  if test -r $file; then
+    cp -f $file copy &&
+    tac copy > exp1 || framework_failure_
+
+    tac $file > out1 || fail=1
+    compare exp1 out1 || fail=1
+  fi
+done
+
+# Assume timeout is due to failure to close stdin with <&-
+# which was seen on NetBSD 7.1 / x86_64
+returns_ 124 timeout 10 tac - - <&- 2>err && skip_ 'error closing stdin'
+# This failed due to heap corruption from v8.15-v8.25 inclusive.
+returns_ 1 timeout 10 tac - - <&- 2>err || fail=1
+
+Exit $fail