tests/dd/stderr.sh

   1 #!/bin/sh
   2 # Ensure dd recognizes failure to write to stderr.
   3
   4 # Copyright (C) 2009-2024 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 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
  20 print_ver_ dd
  21
  22 p=$abs_top_builddir
  23
  24
  25 # Ensure this exits successfully, even though stderr is closed,
  26 # because it generates no stderr output.
  27 dd --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.
  33 if "$p/src/test" -w /dev/stderr 2>/dev/null &&
  34    "$p/src/test" ! -w /dev/stderr 2>&-; then
  35   : | returns_ 1 dd 2>&- || fail=1
  36 fi
  37
  38 # Likewise for /dev/full, if /dev/full works.
  39 if test -w /dev/full && test -c /dev/full; then
  40   : | returns_ 1 dd 2>/dev/full || fail=1
  41 fi
  42
  43 Exit $fail