1 | /* Smoke test for mallinfo2 |
2 | Copyright (C) 2020-2022 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 | /* Test that mallinfo2 is properly exported and basically works. */ |
20 | |
21 | #include <array_length.h> |
22 | #include <malloc.h> |
23 | #include <stdlib.h> |
24 | #include <support/check.h> |
25 | |
26 | /* This is not specifically needed for the test, but (1) does |
27 | something to the data so gcc doesn't optimize it away, and (2) may |
28 | help when developing future tests. */ |
29 | static void |
30 | print_mi (const char *msg, struct mallinfo2 *m) |
31 | { |
32 | printf(format: "\n%s...\n" , msg); |
33 | #define P(f) printf("%s: %zu\n", #f, m->f) |
34 | P(arena); |
35 | P(ordblks); |
36 | P(smblks); |
37 | P(hblks); |
38 | P(hblkhd); |
39 | P(usmblks); |
40 | P(fsmblks); |
41 | P(uordblks); |
42 | P(fordblks); |
43 | P(keepcost); |
44 | } |
45 | |
46 | /* We do this to force the call to malloc to not be optimized |
47 | away. */ |
48 | volatile void *ptr; |
49 | |
50 | static int |
51 | do_test (void) |
52 | { |
53 | struct mallinfo2 mi1, mi2; |
54 | int i; |
55 | size_t total = 0; |
56 | |
57 | /* This is the key difference between mallinfo() and mallinfo2(). |
58 | It may be a false positive if int and size_t are the same |
59 | size. */ |
60 | TEST_COMPARE (sizeof (mi1.arena), sizeof (size_t)); |
61 | |
62 | mi1 = mallinfo2 (); |
63 | print_mi (msg: "before" , m: &mi1); |
64 | |
65 | /* Allocations that are meaningful-sized but not so large as to be |
66 | mmapped, so that they're all accounted for in the field we test |
67 | below. */ |
68 | for (i = 1; i < 20; ++i) |
69 | { |
70 | ptr = malloc (size: 160 * i); |
71 | total += 160 * i; |
72 | } |
73 | |
74 | mi2 = mallinfo2 (); |
75 | print_mi (msg: "after" , m: &mi2); |
76 | |
77 | /* Check at least something changed. */ |
78 | TEST_VERIFY (mi2.uordblks >= mi1.uordblks + total); |
79 | |
80 | return 0; |
81 | } |
82 | |
83 | #include <support/test-driver.c> |
84 | |