tests/dd/skip-seek-past-file

   1 #!/bin/sh
   2 # test diagnostics are printed when seeking too far in seekable files.
   3
   4 # Copyright (C) 2008-2010 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 <http://www.gnu.org/licenses/>.
  18
  19 if test "$VERBOSE" = yes; then
  20   set -x
  21   dd --version
  22 fi
  23
  24 . $srcdir/test-lib.sh
  25 require_sparse_support_ # for `truncate --size=$OFF_T_MAX`
  26 eval $(getlimits) # for OFF_T limits
  27
  28
  29 printf "1234" > file || framework_failure
  30
  31 echo "\
  32 dd: \`standard input': cannot skip to specified offset
  33 0+0 records in
  34 0+0 records out" > skip_err || framework_failure
  35
  36 # skipping beyond number of blocks in file should issue a warning
  37 dd bs=1 skip=5 count=0 status=noxfer < file 2> err || fail=1
  38 compare skip_err err || fail=1
  39
  40 # skipping beyond number of bytes in file should issue a warning
  41 dd bs=3 skip=2 count=0 status=noxfer < file 2> err || fail=1
  42 compare skip_err err || fail=1
  43
  44 # skipping beyond number of blocks in pipe should issue a warning
  45 cat file | dd bs=1 skip=5 count=0 status=noxfer 2> err || fail=1
  46 compare skip_err err || fail=1
  47
  48 # skipping beyond number of bytes in pipe should issue a warning
  49 cat file | dd bs=3 skip=2 count=0 status=noxfer 2> err || fail=1
  50 compare skip_err err || fail=1
  51
  52 # Check seeking beyond file already offset into
  53 # skipping beyond number of blocks in file should issue a warning
  54 (dd bs=1 skip=1 count=0 2>/dev/null &&
  55  dd bs=1 skip=4 status=noxfer 2> err) < file || fail=1
  56 compare skip_err err || fail=1
  57
  58 # Check seeking beyond file already offset into
  59 # skipping beyond number of bytes in file should issue a warning
  60 (dd bs=1 skip=1 count=0 2>/dev/null &&
  61  dd bs=2 skip=2 status=noxfer 2> err) < file || fail=1
  62 compare skip_err err || fail=1
  63
  64 # seeking beyond end of file is OK
  65 dd bs=1 seek=5 count=0 status=noxfer > file 2> err || fail=1
  66 echo "0+0 records in
  67 0+0 records out" > err_ok || framework_failure
  68 compare err_ok err || fail=1
  69
  70 # skipping > OFF_T_MAX should fail immediately
  71 dd bs=1 skip=$OFF_T_OFLOW count=0 status=noxfer < file 2> err && fail=1
  72 # error message should be "... cannot skip: strerror(EOVERFLOW)"
  73 grep "cannot skip:" err >/dev/null || fail=1
  74
  75 # skipping > max file size should fail immediately
  76 if ! truncate --size=$OFF_T_MAX in 2>/dev/null; then
  77   # truncate is to ensure file system doesn't actually support OFF_T_MAX files
  78   dd bs=1 skip=$OFF_T_MAX count=0 status=noxfer < file 2> err \
  79     && lseek_ok=yes \
  80     || lseek_ok=no
  81
  82   if test $lseek_ok = yes; then
  83     # On Solaris 10 at least, lseek(>max file size) succeeds,
  84     # so just check for the skip warning.
  85     compare skip_err err || fail=1
  86   else
  87     # On Linux kernels at least, lseek(>max file size) fails.
  88     # error message should be "... cannot skip: strerror(EINVAL)"
  89     grep "cannot skip:" err >/dev/null || fail=1
  90   fi
  91 fi
  92
  93 Exit $fail