936298e2bd
that Chris created: this version of GNU malloc was obtained from prep.ai.mit.edu on 9/22/1993. There was no version noted.
151 lines
4.0 KiB
C
151 lines
4.0 KiB
C
/* More debugging hooks for `malloc'.
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Copyright (C) 1991, 1992, 1993 Free Software Foundation, Inc.
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Written April 2, 1991 by John Gilmore of Cygnus Support.
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Based on mcheck.c by Mike Haertel.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA.
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The author may be reached (Email) at the address mike@ai.mit.edu,
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or (US mail) as Mike Haertel c/o Free Software Foundation. */
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#ifndef _MALLOC_INTERNAL
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#define _MALLOC_INTERNAL
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#include <malloc.h>
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#endif
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#include <stdio.h>
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#ifndef __GNU_LIBRARY__
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extern char *getenv ();
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#else
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#include <stdlib.h>
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#endif
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static FILE *mallstream;
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static char mallenv[]= "MALLOC_TRACE";
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static char mallbuf[BUFSIZ]; /* Buffer for the output. */
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/* Address to breakpoint on accesses to... */
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__ptr_t mallwatch;
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/* Old hook values. */
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static void (*tr_old_free_hook) __P ((__ptr_t ptr));
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static __ptr_t (*tr_old_malloc_hook) __P ((size_t size));
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static __ptr_t (*tr_old_realloc_hook) __P ((__ptr_t ptr, size_t size));
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/* This function is called when the block being alloc'd, realloc'd, or
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freed has an address matching the variable "mallwatch". In a debugger,
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set "mallwatch" to the address of interest, then put a breakpoint on
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tr_break. */
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void tr_break __P ((void));
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void
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tr_break ()
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{
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}
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static void tr_freehook __P ((__ptr_t));
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static void
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tr_freehook (ptr)
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__ptr_t ptr;
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{
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fprintf (mallstream, "- %p\n", ptr); /* Be sure to print it first. */
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if (ptr == mallwatch)
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tr_break ();
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__free_hook = tr_old_free_hook;
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free (ptr);
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__free_hook = tr_freehook;
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}
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static __ptr_t tr_mallochook __P ((size_t));
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static __ptr_t
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tr_mallochook (size)
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size_t size;
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{
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__ptr_t hdr;
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__malloc_hook = tr_old_malloc_hook;
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hdr = (__ptr_t) malloc (size);
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__malloc_hook = tr_mallochook;
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/* We could be printing a NULL here; that's OK. */
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fprintf (mallstream, "+ %p %x\n", hdr, size);
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if (hdr == mallwatch)
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tr_break ();
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return hdr;
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}
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static __ptr_t tr_reallochook __P ((__ptr_t, size_t));
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static __ptr_t
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tr_reallochook (ptr, size)
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__ptr_t ptr;
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size_t size;
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{
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__ptr_t hdr;
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if (ptr == mallwatch)
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tr_break ();
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__free_hook = tr_old_free_hook;
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__malloc_hook = tr_old_malloc_hook;
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__realloc_hook = tr_old_realloc_hook;
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hdr = (__ptr_t) realloc (ptr, size);
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__free_hook = tr_freehook;
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__malloc_hook = tr_mallochook;
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__realloc_hook = tr_reallochook;
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if (hdr == NULL)
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/* Failed realloc. */
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fprintf (mallstream, "! %p %x\n", ptr, size);
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else
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fprintf (mallstream, "< %p\n> %p %x\n", ptr, hdr, size);
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if (hdr == mallwatch)
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tr_break ();
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return hdr;
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}
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/* We enable tracing if either the environment variable MALLOC_TRACE
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is set, or if the variable mallwatch has been patched to an address
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that the debugging user wants us to stop on. When patching mallwatch,
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don't forget to set a breakpoint on tr_break! */
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void
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mtrace ()
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{
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char *mallfile;
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mallfile = getenv (mallenv);
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if (mallfile != NULL || mallwatch != NULL)
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{
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mallstream = fopen (mallfile != NULL ? mallfile : "/dev/null", "w");
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if (mallstream != NULL)
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{
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/* Be sure it doesn't malloc its buffer! */
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setbuf (mallstream, mallbuf);
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fprintf (mallstream, "= Start\n");
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tr_old_free_hook = __free_hook;
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__free_hook = tr_freehook;
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tr_old_malloc_hook = __malloc_hook;
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__malloc_hook = tr_mallochook;
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tr_old_realloc_hook = __realloc_hook;
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__realloc_hook = tr_reallochook;
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}
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}
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}
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