1 files changed, 43 insertions, 0 deletions
diff --git a/tests/dd/stderr.sh b/tests/dd/stderr.sh
new file mode 100755
index 0000000..4c840b5
--- /dev/null
+++ b/tests/dd/stderr.sh
@@ -0,0 +1,43 @@
+#!/bin/sh
+# Ensure dd recognizes failure to write to stderr.
+
+# Copyright (C) 2009-2018 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/>.
+
+. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
+print_ver_ dd
+
+p=$abs_top_builddir
+
+
+# Ensure this exits successfully, even though stderr is closed,
+# because it generates no stderr output.
+dd --help >/dev/null 2>&- || fail=1
+
+# If 2>&- works, ensure this fails, because stderr is closed and it
+# *does* generate output.  2>&- apparently does not work in HP-UX 11.23.
+# This test is ineffective unless /dev/stderr also works.
+# This exposes a failure present in 6.11 through 7.5.
+if "$p/src/test" -w /dev/stderr 2>/dev/null &&
+   "$p/src/test" ! -w /dev/stderr 2>&-; then
+  : | returns_ 1 dd 2>&- || fail=1
+fi
+
+# Likewise for /dev/full, if /dev/full works.
+if test -w /dev/full && test -c /dev/full; then
+  : | returns_ 1 dd 2>/dev/full || fail=1
+fi
+
+Exit $fail