| 1 | /* Smoke test for mallinfo2 |
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| 2 | Copyright (C) 2020-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | /* Test that mallinfo2 is properly exported and basically works. */ |
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| 20 | |
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| 21 | #include <array_length.h> |
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| 22 | #include <malloc.h> |
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| 23 | #include <stdlib.h> |
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| 24 | #include <support/check.h> |
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| 25 | |
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| 26 | #include "tst-malloc-aux.h" |
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| 27 | |
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| 28 | /* This is not specifically needed for the test, but (1) does |
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| 29 | something to the data so gcc doesn't optimize it away, and (2) may |
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| 30 | help when developing future tests. */ |
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| 31 | static void |
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| 32 | print_mi (const char *msg, struct mallinfo2 *m) |
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| 33 | { |
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| 34 | printf(format: "\n%s...\n" , msg); |
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| 35 | #define P(f) printf("%s: %zu\n", #f, m->f) |
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| 36 | P(arena); |
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| 37 | P(ordblks); |
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| 38 | P(smblks); |
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| 39 | P(hblks); |
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| 40 | P(hblkhd); |
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| 41 | P(usmblks); |
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| 42 | P(fsmblks); |
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| 43 | P(uordblks); |
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| 44 | P(fordblks); |
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| 45 | P(keepcost); |
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| 46 | } |
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| 47 | |
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| 48 | /* We do this to force the call to malloc to not be optimized |
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| 49 | away. */ |
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| 50 | volatile void *ptr; |
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| 51 | |
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| 52 | static int |
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| 53 | do_test (void) |
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| 54 | { |
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| 55 | struct mallinfo2 mi1, mi2; |
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| 56 | int i; |
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| 57 | size_t total = 0; |
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| 58 | |
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| 59 | /* This is the key difference between mallinfo() and mallinfo2(). |
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| 60 | It may be a false positive if int and size_t are the same |
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| 61 | size. */ |
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| 62 | TEST_COMPARE (sizeof (mi1.arena), sizeof (size_t)); |
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| 63 | |
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| 64 | mi1 = mallinfo2 (); |
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| 65 | print_mi (msg: "before" , m: &mi1); |
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| 66 | |
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| 67 | /* Allocations that are meaningful-sized but not so large as to be |
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| 68 | mmapped, so that they're all accounted for in the field we test |
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| 69 | below. */ |
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| 70 | for (i = 1; i < 20; ++i) |
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| 71 | { |
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| 72 | ptr = malloc (160 * i); |
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| 73 | total += 160 * i; |
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| 74 | } |
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| 75 | |
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| 76 | mi2 = mallinfo2 (); |
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| 77 | print_mi (msg: "after" , m: &mi2); |
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| 78 | |
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| 79 | /* Check at least something changed. */ |
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| 80 | TEST_VERIFY (mi2.uordblks >= mi1.uordblks + total); |
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| 81 | |
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| 82 | return 0; |
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| 83 | } |
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| 84 | |
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| 85 | #include <support/test-driver.c> |
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| 86 | |
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