1#!/bin/sh
2# Ensure dd recognizes failure to write to stderr.
3
4# Copyright (C) 2009-2023 Free Software Foundation, Inc.
5
6# This program is free software: you can redistribute it and/or modify
7# it under the terms of the GNU General Public License as published by
8# the Free Software Foundation, either version 3 of the License, or
9# (at your option) any later version.
10
11# This program is distributed in the hope that it will be useful,
12# but WITHOUT ANY WARRANTY; without even the implied warranty of
13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14# GNU General Public License for more details.
15
16# You should have received a copy of the GNU General Public License
17# along with this program.  If not, see <https://www.gnu.org/licenses/>.
18
19. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
20print_ver_ dd
21
22p=$abs_top_builddir
23
24
25# Ensure this exits successfully, even though stderr is closed,
26# because it generates no stderr output.
27dd --help >/dev/null 2>&- || fail=1
28
29# If 2>&- works, ensure this fails, because stderr is closed and it
30# *does* generate output.  2>&- apparently does not work in HP-UX 11.23.
31# This test is ineffective unless /dev/stderr also works.
32# This exposes a failure present in 6.11 through 7.5.
33if "$p/src/test" -w /dev/stderr 2>/dev/null &&
34   "$p/src/test" ! -w /dev/stderr 2>&-; then
35  : | returns_ 1 dd 2>&- || fail=1
36fi
37
38# Likewise for /dev/full, if /dev/full works.
39if test -w /dev/full && test -c /dev/full; then
40  : | returns_ 1 dd 2>/dev/full || fail=1
41fi
42
43Exit $fail
44