79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
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/*
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Copyright (C) 2011 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifdef DEBUG_RT_ALLOC
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#define _GNU_SOURCE
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#include <dlfcn.h>
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#include <stdio.h>
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#include <pthread.h>
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#include <stdlib.h>
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int (*pbd_alloc_allowed) () = 0;
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/** Thread-local key whose value is set to 1 if malloc checking is disabled
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* for this thread, 0 otherwise.
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*/
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static pthread_key_t disabled;
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static pthread_once_t once;
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static void
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make_key (void)
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{
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(void) pthread_key_create (&disabled, NULL);
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}
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/** This is our malloc which overrides the system one */
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void* malloc (size_t s)
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{
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static void * (*real_malloc) (size_t) = NULL;
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if (!real_malloc) {
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/* find the system malloc */
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real_malloc = dlsym (RTLD_NEXT, "malloc");
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}
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(void) pthread_once (&once, make_key);
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if (pthread_getspecific (disabled) == NULL && pbd_alloc_allowed && !pbd_alloc_allowed ()) {
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/* pbd_alloc_allowed says that this malloc is not permitted */
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abort ();
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}
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/* Pass through to the system malloc */
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return real_malloc (s);
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}
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void
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suspend_rt_malloc_checks ()
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{
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(void) pthread_once (&once, make_key);
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pthread_setspecific (disabled, (void *) 1);
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}
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void
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resume_rt_malloc_checks ()
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{
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(void) pthread_once (&once, make_key);
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pthread_setspecific (disabled, (void *) 0);
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}
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#endif
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