malloc/tst-mallocalign1.c

   1 /* Verify that MALLOC_ALIGNMENT is honored by malloc.
   2    Copyright (C) 2012-2021 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 <stdio.h>
  20 #include <stdlib.h>
  21 #include <inttypes.h>
  22 #include <malloc-size.h>
  23
  24 static void *
  25 test (size_t s)
  26 {
  27   void *p = malloc (s);
  28
  29   printf ("malloc: %zu, %p: %zu\n", s, p,
  30           ((uintptr_t) p) & MALLOC_ALIGN_MASK);
  31   return p;
  32 }
  33
  34 static int
  35 do_test (void)
  36 {
  37   void *p;
  38   int ret = 0;
  39
  40   p = test (2);
  41   ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
  42   free (p);
  43
  44   p = test (8);
  45   ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
  46   free (p);
  47
  48   p = test (13);
  49   ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
  50   free (p);
  51
  52   p = test (16);
  53   ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
  54   free (p);
  55
  56   p = test (23);
  57   ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
  58   free (p);
  59
  60   p = test (43);
  61   ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
  62   free (p);
  63
  64   p = test (123);
  65   ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
  66   free (p);
  67
  68   return ret;
  69 }
  70
  71 #include <support/test-driver.c>