1  /* Tests for pread64 and pwrite64.
       2     Copyright (C) 2000-2023 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-preadwrite-common.c"
      21  
      22  static int
      23  do_test (void)
      24  {
      25    ssize_t ret;
      26  
      27    ret = do_test_with_offset (0);
      28    if (ret == -1)
      29      return 1;
      30  
      31    /* Create a sparse file larger than 4GB to check if offset is handled
      32       correctly in p{write,read}64. */
      33    off_t base_offset = UINT32_MAX + 2048LL;
      34    ret = do_test_with_offset (base_offset);
      35    if (ret == -1)
      36      return 1;
      37  
      38    struct stat st;
      39    if (fstat (fd, &st) == -1)
      40      {
      41        printf ("error: fstat on temporary file failed: %m");
      42        return 1;
      43      }
      44  
      45    /* The file size should >= base_offset plus bytes read.  */
      46    off_t expected_value = base_offset + ret;
      47    if (st.st_size < expected_value)
      48      {
      49        printf ("error: file size less than expected (%jd > %jd)\n",
      50  	      (intmax_t) expected_value, (intmax_t) st.st_size);
      51        return 1;
      52      }
      53  
      54    return 0;
      55  }