1/* Tests for pread64 and pwrite64.
2 Copyright (C) 2000-2022 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
22static int
23do_test (void)
24{
25 ssize_t ret;
26
27 ret = do_test_with_offset (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 (offset: base_offset);
35 if (ret == -1)
36 return 1;
37
38 struct stat st;
39 if (fstat (fd: fd, buf: &st) == -1)
40 {
41 printf (format: "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 (format: "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}
56

source code of glibc/posix/tst-preadwrite64.c