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/* More debugging hooks for `malloc'.
Copyright (C) 1991, 1992, 1993 Free Software Foundation, Inc.
Written April 2, 1991 by John Gilmore of Cygnus Support.
Based on mcheck.c by Mike Haertel.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.
The author may be reached (Email) at the address mike@ai.mit.edu,
or (US mail) as Mike Haertel c/o Free Software Foundation. */
#ifndef _MALLOC_INTERNAL
#define _MALLOC_INTERNAL
#include <malloc.h>
#endif
#include <stdio.h>
#ifndef __GNU_LIBRARY__
extern char *getenv ();
#else
#include <stdlib.h>
#endif
static FILE *mallstream;
static char mallenv[]= "MALLOC_TRACE";
static char mallbuf[BUFSIZ]; /* Buffer for the output. */
/* Address to breakpoint on accesses to... */
__ptr_t mallwatch;
/* Old hook values. */
static void (*tr_old_free_hook) __P ((__ptr_t ptr));
static __ptr_t (*tr_old_malloc_hook) __P ((size_t size));
static __ptr_t (*tr_old_realloc_hook) __P ((__ptr_t ptr, size_t size));
/* This function is called when the block being alloc'd, realloc'd, or
freed has an address matching the variable "mallwatch". In a debugger,
set "mallwatch" to the address of interest, then put a breakpoint on
tr_break. */
void tr_break __P ((void));
void
tr_break ()
{
}
static void tr_freehook __P ((__ptr_t));
static void
tr_freehook (ptr)
__ptr_t ptr;
{
fprintf (mallstream, "- %p\n", ptr); /* Be sure to print it first. */
if (ptr == mallwatch)
tr_break ();
__free_hook = tr_old_free_hook;
free (ptr);
__free_hook = tr_freehook;
}
static __ptr_t tr_mallochook __P ((size_t));
static __ptr_t
tr_mallochook (size)
size_t size;
{
__ptr_t hdr;
__malloc_hook = tr_old_malloc_hook;
hdr = (__ptr_t) malloc (size);
__malloc_hook = tr_mallochook;
/* We could be printing a NULL here; that's OK. */
fprintf (mallstream, "+ %p %x\n", hdr, size);
if (hdr == mallwatch)
tr_break ();
return hdr;
}
static __ptr_t tr_reallochook __P ((__ptr_t, size_t));
static __ptr_t
tr_reallochook (ptr, size)
__ptr_t ptr;
size_t size;
{
__ptr_t hdr;
if (ptr == mallwatch)
tr_break ();
__free_hook = tr_old_free_hook;
__malloc_hook = tr_old_malloc_hook;
__realloc_hook = tr_old_realloc_hook;
hdr = (__ptr_t) realloc (ptr, size);
__free_hook = tr_freehook;
__malloc_hook = tr_mallochook;
__realloc_hook = tr_reallochook;
if (hdr == NULL)
/* Failed realloc. */
fprintf (mallstream, "! %p %x\n", ptr, size);
else
fprintf (mallstream, "< %p\n> %p %x\n", ptr, hdr, size);
if (hdr == mallwatch)
tr_break ();
return hdr;
}
/* We enable tracing if either the environment variable MALLOC_TRACE
is set, or if the variable mallwatch has been patched to an address
that the debugging user wants us to stop on. When patching mallwatch,
don't forget to set a breakpoint on tr_break! */
void
mtrace ()
{
char *mallfile;
mallfile = getenv (mallenv);
if (mallfile != NULL || mallwatch != NULL)
{
mallstream = fopen (mallfile != NULL ? mallfile : "/dev/null", "w");
if (mallstream != NULL)
{
/* Be sure it doesn't malloc its buffer! */
setbuf (mallstream, mallbuf);
fprintf (mallstream, "= Start\n");
tr_old_free_hook = __free_hook;
__free_hook = tr_freehook;
tr_old_malloc_hook = __malloc_hook;
__malloc_hook = tr_mallochook;
tr_old_realloc_hook = __realloc_hook;
__realloc_hook = tr_reallochook;
}
}
}
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