malloc/mcheck.h

   1 /* Copyright (C) 1996-2023 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #ifndef _MCHECK_H
  19 #define _MCHECK_H       1
  20
  21 #include <features.h>
  22
  23 __BEGIN_DECLS
  24
  25 /* Return values for `mprobe': these are the kinds of inconsistencies that
  26    `mcheck' enables detection of.  */
  27 enum mcheck_status
  28 {
  29   MCHECK_DISABLED = -1,         /* Consistency checking is not turned on.  */
  30   MCHECK_OK,                    /* Block is fine.  */
  31   MCHECK_FREE,                  /* Block freed twice.  */
  32   MCHECK_HEAD,                  /* Memory before the block was clobbered.  */
  33   MCHECK_TAIL                   /* Memory after the block was clobbered.  */
  34 };
  35
  36
  37 /* Activate a standard collection of debugging hooks.  This must be called
  38    before `malloc' is ever called.  ABORTFUNC is called with an error code
  39    (see enum above) when an inconsistency is detected.  If ABORTFUNC is
  40    null, the standard function prints on stderr and then calls `abort'.  */
  41 extern int mcheck (void (*__abortfunc)(enum mcheck_status)) __THROW;
  42
  43 /* Similar to `mcheck' but performs checks for all block whenever one of
  44    the memory handling functions is called.  This can be very slow.  */
  45 extern int mcheck_pedantic (void (*__abortfunc)(enum mcheck_status)) __THROW;
  46
  47 /* Force check of all blocks now.  */
  48 extern void mcheck_check_all (void);
  49
  50 /* Check for aberrations in a particular malloc'd block.  You must have
  51    called `mcheck' already.  These are the same checks that `mcheck' does
  52    when you free or reallocate a block.  */
  53 extern enum mcheck_status mprobe (void *__ptr) __THROW;
  54
  55 /* Activate a standard collection of tracing hooks.  */
  56 extern void mtrace (void) __THROW;
  57 extern void muntrace (void) __THROW;
  58
  59 __END_DECLS
  60 #endif /* mcheck.h */