1/* Tests of functions to access `dev_t' values.
2 Copyright (C) 2016-2022 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#include <sys/types.h>
20#include <sys/sysmacros.h>
21#include <stdio.h>
22#include <inttypes.h>
23
24/* Confirm that makedev (major (d), minor (d)) == d. */
25static int
26do_test_split_combine (dev_t d1)
27{
28 unsigned int maj = major (d1);
29 unsigned int min = minor (d1);
30 dev_t d2 = makedev (maj, min);
31 if (d1 != d2)
32 {
33 printf (format: "FAIL: %016" PRIx64 " != %016" PRIx64 " (maj %08x min %08x)\n",
34 (uint64_t)d2, (uint64_t)d1, maj, min);
35 return 1;
36 }
37 else
38 return 0;
39}
40
41/* Confirm that major (makedev (maj, min)) == maj and
42 minor (makedev (maj, min)) == min. */
43static int
44do_test_combine_split (unsigned int maj1, unsigned int min1)
45{
46 dev_t d = makedev (maj1, min1);
47 unsigned int maj2 = major (d);
48 unsigned int min2 = minor (d);
49 if (maj1 != maj2 && min1 != min2)
50 {
51 printf (format: "FAIL: %08x != %08x, %08x != %08x (dev %016" PRIx64 ")\n",
52 maj2, maj1, min2, min1, (uint64_t)d);
53 return 1;
54 }
55 else if (maj1 != maj2)
56 {
57 printf (format: "FAIL: %08x != %08x, %08x == %08x (dev %016" PRIx64 ")\n",
58 maj2, maj1, min2, min1, (uint64_t)d);
59 return 1;
60 }
61 else if (min1 != min2)
62 {
63 printf (format: "FAIL: %08x == %08x, %08x != %08x (dev %016" PRIx64 ")\n",
64 maj2, maj1, min2, min1, (uint64_t)d);
65 return 1;
66 }
67 else
68 return 0;
69}
70
71static int
72do_test (void)
73{
74 dev_t d;
75 unsigned int maj, min;
76 int status = 0;
77
78 /* Test the traditional range (16-bit dev_t, 8-bit each maj/min)
79 exhaustively. */
80 for (d = 0; d <= 0xFFFF; d++)
81 status |= do_test_split_combine (d1: d);
82
83 for (maj = 0; maj <= 0xFF; maj++)
84 for (min = 0; min <= 0xFF; min++)
85 status |= do_test_combine_split (maj1: maj, min1: min);
86
87 /* Test glibc's expanded range (64-bit dev_t, 32-bit each maj/min).
88 Exhaustive testing would take much too long, instead we shift a
89 pair of 1-bits over each range. */
90 {
91 unsigned int a, b;
92 for (a = 0; a <= 63; a++)
93 do_test_split_combine (d1: ((dev_t) 0x03) << a);
94
95 for (a = 0; a < 31; a++)
96 for (b = 0; b <= 31; b++)
97 do_test_combine_split (maj1: 0x03u << a, min1: 0x03u << b);
98 }
99
100 return status;
101}
102
103#define TEST_FUNCTION do_test ()
104#include "../test-skeleton.c"
105

source code of glibc/misc/tst-makedev.c