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/*
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2005 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include <sys/types.h>
#include <sys/mman.h>
#include <stdio.h>
#define __USE_GNU
#include <dlfcn.h>
#include <malloc.h>
#include <assert.h>
#include <stdlib.h>
#include "opal/memoryhooks/memory_internal.h"
/* Prototypes for our hooks. */
void opal_memory_malloc_hooks_init(void);
static void local_free_hook(void*, const void*);
static void* local_malloc_hook(size_t, const void*);
static void* local_realloc_hook(void*, size_t, const void*);
/* Override initializing hook from the C library. */
void (*__malloc_initialize_hook) (void) = opal_memory_malloc_hooks_init;
/* local variable - next in stack of free hooks */
static void (*old_free_hook)(void*, const void*);
static void* (*old_realloc_hook)(void*, size_t, const void*);
static void* (*old_malloc_hook)(size_t, const void*);
int opal_memory_malloc_hooks_initialized = 0;
void
opal_memory_malloc_hooks_init(void)
{
if (opal_memory_malloc_hooks_initialized != 0) {
return;
}
opal_memory_malloc_hooks_initialized = 1;
old_free_hook = __free_hook;
old_malloc_hook = __malloc_hook;
old_realloc_hook = __realloc_hook;
__free_hook = local_free_hook;
__malloc_hook = local_malloc_hook;
__realloc_hook = local_realloc_hook;
opal_mem_hooks_set_support(OPAL_MEMORY_FREE_SUPPORT|OPAL_MEMORY_MALLOC_SUPPORT);
assert(__malloc_hook == local_malloc_hook);
}
static void
local_free_hook(void *ptr, const void *caller)
{
if (__malloc_hook != local_malloc_hook) abort();
/* dispatch about the pending free */
opal_mem_hooks_release_hook(ptr, malloc_usable_size(ptr), 1);
__free_hook = old_free_hook;
/* call the next chain down */
free(ptr);
/* save the hooks again and restore our hook again */
old_free_hook = __free_hook;
__free_hook = local_free_hook;
}
static void*
local_malloc_hook(size_t size, const void *caller)
{
void *ret;
__malloc_hook = old_malloc_hook;
/* call the next chain down */
ret = malloc(size);
/* save the hooks again and restory our hack again */
old_malloc_hook = __malloc_hook;
__malloc_hook = local_malloc_hook;
opal_mem_hooks_alloc_hook(ret, malloc_usable_size(ret), 1);
assert(__malloc_hook == local_malloc_hook);
return ret;
}
/* for better or worse, we must assume that the buffer being passed to
realloc is not going to be expandable and therefore is going to be
free()ed. */
static void*
local_realloc_hook(void *ptr, size_t size, const void *caller)
{
void *ret;
assert(__malloc_hook == local_malloc_hook);
/* dispatch about the pending free */
opal_mem_hooks_release_hook(ptr, malloc_usable_size(ptr), 1);
/* realloc can call malloc (but not free). Doing so with the
* memory hooks causes us some interesting problems and causes
* the malloc_hook to be left as NULL. Pop the stack now so
* that we don't see the memory registration twice.
*/
__realloc_hook = old_realloc_hook;
__malloc_hook = old_malloc_hook;
/* call the next chain down */
ret = realloc(ptr, size);
/* save the hooks again and restore our hook again */
old_realloc_hook = __realloc_hook;
old_malloc_hook = __malloc_hook;
__realloc_hook = local_realloc_hook;
__malloc_hook = local_malloc_hook;
opal_mem_hooks_alloc_hook(ret, malloc_usable_size(ret), 1);
assert(__malloc_hook == local_malloc_hook);
return ret;
}
#if 0
/* mmap is a weak symbol on any platform that I know of that
supports malloc hooks, so we can just intercept it like this... */
void*
mmap(void* addr, size_t len, int prot, int flags, int fd, off_t offset)
{
void *ret;
static void* (*realmmap)(void*, size_t, int, int, int, off_t);
if (NULL == realmmap) {
union {
void* (*mmap_fp)(void*, size_t, int, int, int, off_t);
void *mmap_p;
} tmp;
tmp.mmap_p = dlsym(RTLD_NEXT, "mmap");
realmmap = tmp.mmap_fp;
}
ret = realmmap(addr, len, prot, flags, fd, offset);
opal_mem_hooks_alloc_hook(ret, len, 0);
return ret;
}
#endif
/* munmap is a weak symbol on any platform that I know of that
supports malloc hooks, so we can just intercept it like this... */
int
munmap(void* addr, size_t len)
{
static int (*realmunmap)(void*, size_t);
/* dispatch about the pending release */
opal_mem_hooks_release_hook(addr, len, 0);
assert(__malloc_hook == local_malloc_hook);
if (NULL == realmunmap) {
union {
int (*munmap_fp)(void*, size_t);
void *munmap_p;
} tmp;
tmp.munmap_p = dlsym(RTLD_NEXT, "munmap");
realmunmap = tmp.munmap_fp;
}
return realmunmap(addr, len);
}
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