tests/misc/csplit-io-err.sh

   1 #!/bin/sh
   2 # Ensure we handle i/o errors correctly in csplit
   3
   4 # Copyright (C) 2015-2019 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 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
  20 print_ver_ csplit
  21 require_gcc_shared_
  22
  23 if ! test -w /dev/full || ! test -c /dev/full; then
  24   skip_ '/dev/full is required'
  25 fi
  26
  27 # Ensure error messages are in English
  28 LC_ALL=C
  29 export LC_ALL
  30
  31 # Replace fwrite and ferror, always returning an error
  32 cat > k.c <<'EOF' || framework_failure_
  33 #include <stdio.h>
  34 #include <errno.h>
  35
  36 #undef fwrite
  37 #undef fwrite_unlocked
  38
  39 size_t
  40 fwrite (const void *ptr, size_t size, size_t nitems, FILE *stream)
  41 {
  42   fclose (fopen ("preloaded","w")); /* marker for preloaded interception */
  43   errno = ENOSPC;
  44   return 0;
  45 }
  46
  47 size_t
  48 fwrite_unlocked (const void *ptr, size_t size, size_t nitems, FILE *stream)
  49 {
  50   return fwrite (ptr, size, nitems, stream);
  51 }
  52 EOF
  53
  54 # Get the wording of the OS-dependent ENOSPC message
  55 returns_ 1 seq 1 >/dev/full 2>msgt || framework_failure_
  56 sed 's/seq: write error: //' msgt > msg || framework_failure_
  57
  58 # Create the expected error message
  59 { printf "%s" "csplit: write error for 'xx01': " ; cat msg ; } > exp \
  60   || framework_failure_
  61
  62 # compile/link the interception shared library:
  63 gcc_shared_ k.c k.so \
  64   || skip_ 'failed to build forced-fwrite-failure shared library'
  65
  66 # Split the input, and force fwrite() failure -
  67 # the 'csplit' command should fail with exit code 1
  68 # (checked with 'returns_ 1 ... || fail=1')
  69 seq 10 |
  70 (export LD_PRELOAD=$LD_PRELOAD:./k.so
  71  returns_ 1 csplit - 1 4 2>out) || fail=1
  72
  73 test -e preloaded || skip_ 'LD_PRELOAD interception failed'
  74
  75 # Ensure we got the expected error message
  76 compare exp out || fail=1
  77
  78 Exit $fail