tests/dd/skip-seek-past-file.sh

   1 #!/bin/sh
   2 # test diagnostics are printed when seeking too far in seekable files.
   3
   4 # Copyright (C) 2008-2024 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 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
  20 print_ver_ dd
  21 require_sparse_support_ # for 'truncate --size=$OFF_T_MAX'
  22 eval $(getlimits) # for OFF_T limits
  23 export LC_ALL=C
  24
  25 printf "1234" > file || framework_failure_
  26
  27 echo "\
  28 dd: 'standard input': cannot skip to specified offset
  29 0+0 records in
  30 0+0 records out" > skip_err || framework_failure_
  31
  32 # skipping beyond number of blocks in file should issue a warning
  33 dd bs=1 skip=5 count=0 status=noxfer < file 2> err || fail=1
  34 compare skip_err err || fail=1
  35
  36 # skipping beyond number of bytes in file should issue a warning
  37 dd bs=3 skip=2 count=0 status=noxfer < file 2> err || fail=1
  38 compare skip_err err || fail=1
  39
  40 # skipping beyond number of blocks in pipe should issue a warning
  41 cat file | dd bs=1 skip=5 count=0 status=noxfer 2> err || fail=1
  42 compare skip_err err || fail=1
  43
  44 # skipping beyond number of bytes in pipe should issue a warning
  45 cat file | dd bs=3 skip=2 count=0 status=noxfer 2> err || fail=1
  46 compare skip_err err || fail=1
  47
  48 # Check seeking beyond file already offset into
  49 # skipping beyond number of blocks in file should issue a warning
  50 (dd bs=1 skip=1 count=0 2>/dev/null &&
  51  dd bs=1 skip=4 status=noxfer 2> err) < file || fail=1
  52 compare skip_err err || fail=1
  53
  54 # Check seeking beyond file already offset into
  55 # skipping beyond number of bytes in file should issue a warning
  56 (dd bs=1 skip=1 count=0 2>/dev/null &&
  57  dd bs=2 skip=2 status=noxfer 2> err) < file || fail=1
  58 compare skip_err err || fail=1
  59
  60 # seeking beyond end of file is OK
  61 dd bs=1 seek=5 count=0 status=noxfer > file 2> err || fail=1
  62 echo "0+0 records in
  63 0+0 records out" > err_ok || framework_failure_
  64 compare err_ok err || fail=1
  65
  66 # skipping > OFF_T_MAX should fail immediately
  67 dd bs=1 skip=$OFF_T_OFLOW count=0 status=noxfer < file 2> err && fail=1
  68 # error message should be "... invalid number: strerror(EOVERFLOW)"
  69 grep "invalid number:" err >/dev/null || fail=1
  70 dd bs=1 skip=${OFF_T_OFLOW}x$OFF_T_OFLOW count=0 status=noxfer < file 2> err &&
  71     fail=1
  72 grep "invalid number:" err >/dev/null || fail=1
  73
  74 # skipping > max file size should fail immediately
  75 if ! truncate --size=$OFF_T_MAX in 2>/dev/null; then
  76   # truncate is to ensure file system doesn't actually support OFF_T_MAX files
  77   dd bs=1 skip=$OFF_T_MAX count=0 status=noxfer < file 2> err \
  78     && lseek_ok=yes \
  79     || lseek_ok=no
  80
  81   if test $lseek_ok = yes; then
  82     # On Solaris 10 at least, lseek(>max file size) succeeds,
  83     # so just check for the skip warning.
  84     compare skip_err err || fail=1
  85   else
  86     # On Linux kernels at least, lseek(>max file size) fails.
  87     # error message should be "... cannot skip: strerror(EINVAL)"
  88     grep "cannot skip:" err >/dev/null || fail=1
  89   fi
  90 fi
  91
  92 Exit $fail