/*
* More debugging hooks for `malloc'.
* * Copyright (C) 1991, 1992, 1993, 1994 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.
*/
#include <stdio.h>
#include "copyright.h"
#include "config.h"
#include <malloc.h>
static FILE *mallstream;
static char mallbuf[BUFSIZ]; /*
* Buffer for the output.
*/
/*
* Address to breakpoint on accesses to...
*/
__ptr_t mallwatch;
/*
* File name and line number information, for callers that had
* * the foresight to call through a macro.
*/
char *_mtrace_file;
int _mtrace_line;
/*
* Old hook values.
*/
static void (*tr_old_free_hook) __P((__ptr_t ptr));
static __ptr_t(*tr_old_malloc_hook) __P((__malloc_size_t size));
static __ptr_t(*tr_old_realloc_hook) __P((__ptr_t ptr,
__malloc_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_where __P((void));
static void tr_where()
{
if (_mtrace_file) {
fprintf(mallstream, "@ %s:%d ", _mtrace_file, _mtrace_line);
fflush(mallstream);
_mtrace_file = NULL;
}
}
static void tr_freehook __P((__ptr_t));
static void tr_freehook(ptr)
__ptr_t ptr;
{
tr_where();
fprintf(mallstream, "- %p\n", ptr); /*
* Be sure to print it first.
*
* fflush(mallstream);
*
* *
*/
if (ptr == mallwatch)
tr_break();
__free_hook = tr_old_free_hook;
free(ptr);
__free_hook = tr_freehook;
}
static __ptr_t tr_mallochook __P((__malloc_size_t));
static __ptr_t tr_mallochook(size)
__malloc_size_t size;
{
__ptr_t hdr;
__malloc_hook = tr_old_malloc_hook;
hdr = (__ptr_t) malloc(size);
__malloc_hook = tr_mallochook;
tr_where();
/*
* We could be printing a NULL here; that's OK.
*/
fprintf(mallstream, "+ %p %lx\n", hdr, (unsigned long) size);
fflush(mallstream);
if (hdr == mallwatch)
tr_break();
return hdr;
}
static __ptr_t tr_reallochook __P((__ptr_t, __malloc_size_t));
static __ptr_t tr_reallochook(ptr, size)
__ptr_t ptr;
__malloc_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;
tr_where();
if (hdr == NULL)
/*
* Failed realloc.
*/
fprintf(mallstream, "! %p %lx\n", ptr, (unsigned long) size);
else
fprintf(mallstream, "< %p\n> %p %lx\n", ptr, hdr,
(unsigned long) size);
fflush(mallstream);
if (hdr == mallwatch)
tr_break();
return hdr;
}
void mtrace()
{
const char *mallfile = MTRACE_FILE;
/*
* Don't panic if we're called more than once.
*/
if (mallstream != NULL)
return;
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");
fflush(mallstream);
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;
}
}
}
void muntrace()
{
if (mallstream == NULL)
return;
fprintf(mallstream, "= End\n");
fflush(mallstream);
fclose(mallstream);
mallstream = NULL;
__free_hook = tr_old_free_hook;
__malloc_hook = tr_old_malloc_hook;
__realloc_hook = tr_old_realloc_hook;
}