misc/tst-preadvwritev64.c

   1 /* Tests for pread64 and pwrite64.
   2    Copyright (C) 2016-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #define _FILE_OFFSET_BITS 64
  20 #include "tst-preadvwritev-common.c"
  21
  22 static int
  23 do_test (void)
  24 {
  25   int ret;
  26
  27   ret = do_test_with_offset (0);
  28
  29   if (!temp_fd_supports_holes)
  30     {
  31       puts ("warning: partial test due to lack of support for holes");
  32       return ret;
  33     }
  34
  35   /* Create a sparse file larger than 4GB to check if offset is handled
  36      correctly in p{write,read}v64. */
  37   off_t base_offset = UINT32_MAX + 2048LL;
  38   ret += do_test_with_offset (base_offset);
  39
  40   struct stat st;
  41   if (fstat (temp_fd, &st) == -1)
  42     {
  43       printf ("error: fstat on temporary file failed: %m");
  44       return 1;
  45     }
  46
  47   /* The total size should base_offset plus 2 * 96.  */
  48   off_t expected_value = base_offset + (2 * (96LL));
  49   if (st.st_size != expected_value)
  50     {
  51       printf ("error: file size different than expected (%jd != %jd)\n",
  52               (intmax_t) expected_value, (intmax_t) st.st_size);
  53       return 1;
  54     }
  55
  56   return ret;
  57 }