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Filename : mcheck.h
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/* Copyright (C) 1996-2022 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#ifndef _MCHECK_H
#define _MCHECK_H       1

#include <features.h>

__BEGIN_DECLS

/* Return values for `mprobe': these are the kinds of inconsistencies that
   `mcheck' enables detection of.  */
enum mcheck_status
{
  MCHECK_DISABLED = -1,         /* Consistency checking is not turned on.  */
  MCHECK_OK,                    /* Block is fine.  */
  MCHECK_FREE,                  /* Block freed twice.  */
  MCHECK_HEAD,                  /* Memory before the block was clobbered.  */
  MCHECK_TAIL                   /* Memory after the block was clobbered.  */
};


/* Activate a standard collection of debugging hooks.  This must be called
   before `malloc' is ever called.  ABORTFUNC is called with an error code
   (see enum above) when an inconsistency is detected.  If ABORTFUNC is
   null, the standard function prints on stderr and then calls `abort'.  */
extern int mcheck (void (*__abortfunc)(enum mcheck_status)) __THROW;

/* Similar to `mcheck' but performs checks for all block whenever one of
   the memory handling functions is called.  This can be very slow.  */
extern int mcheck_pedantic (void (*__abortfunc)(enum mcheck_status)) __THROW;

/* Force check of all blocks now.  */
extern void mcheck_check_all (void);

/* Check for aberrations in a particular malloc'd block.  You must have
   called `mcheck' already.  These are the same checks that `mcheck' does
   when you free or reallocate a block.  */
extern enum mcheck_status mprobe (void *__ptr) __THROW;

/* Activate a standard collection of tracing hooks.  */
extern void mtrace (void) __THROW;
extern void muntrace (void) __THROW;

__END_DECLS
#endif /* mcheck.h */