tests/head/head-write-error.sh

   1 #!/bin/sh
   2 # Ensure we diagnose and not continue writing to
   3 # the output if we get a write error.
   4
   5 # Copyright (C) 2014-2024 Free Software Foundation, Inc.
   6
   7 # This program is free software: you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation, either version 3 of the License, or
  10 # (at your option) any later version.
  11
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19
  20 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
  21 print_ver_ head
  22
  23 if ! test -w /dev/full || ! test -c /dev/full; then
  24   skip_ '/dev/full is required'
  25 fi
  26
  27 # We can't use /dev/zero as that's bypassed in the --lines case
  28 # due to lseek() indicating it has a size of zero.
  29 yes | head -c10M > bigseek || framework_failure_
  30
  31 # This is the single output diagnostic expected,
  32 # (without the possibly varying :strerror(ENOSPC) suffix).
  33 printf '%s\n' "head: error writing 'standard output'" > exp
  34
  35 # Memory is bounded in these cases
  36 for item in lines bytes; do
  37   for N in 0 1; do
  38     # pipe case
  39     yes | returns_ 1 timeout 10s head --$item=-$N > /dev/full 2> errt || fail=1
  40     sed 's/\(head:.*\):.*/\1/' errt > err
  41     compare exp err || fail=1
  42
  43     # seekable case
  44     returns_ 1 timeout 10s head --$item=-$N bigseek > /dev/full 2> errt \
  45         || fail=1
  46     sed 's/\(head:.*\):.*/\1/' errt > err
  47     compare exp err || fail=1
  48   done
  49 done
  50
  51 Exit $fail