newlib/winsup/cygwin/malloc_wrapper.cc

308 lines
5.8 KiB
C++

/* malloc_wrapper.cc
Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
2007, 2008, 2009, 2013, 2015 Red Hat, Inc.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include "cygerrno.h"
#include "security.h"
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "perprocess.h"
#include "miscfuncs.h"
#include "cygmalloc.h"
#ifndef MALLOC_DEBUG
#include <malloc.h>
#endif
extern "C" struct mallinfo dlmallinfo ();
/* we provide these stubs to call into a user's
provided malloc if there is one - otherwise
functions we provide - like strdup will cause
problems if malloced on our heap and free'd on theirs.
*/
static bool use_internal = true;
static bool internal_malloc_determined;
/* These routines are used by the application if it
doesn't provide its own malloc. */
extern "C" void
free (void *p)
{
malloc_printf ("(%p), called by %p", p, caller_return_address ());
if (!use_internal)
user_data->free (p);
else
{
__malloc_lock ();
dlfree (p);
__malloc_unlock ();
}
}
extern "C" void *
malloc (size_t size)
{
void *res;
if (!use_internal)
res = user_data->malloc (size);
else
{
__malloc_lock ();
res = dlmalloc (size);
__malloc_unlock ();
}
malloc_printf ("(%ld) = %p, called by %p", size, res,
caller_return_address ());
return res;
}
extern "C" void *
realloc (void *p, size_t size)
{
void *res;
if (!use_internal)
res = user_data->realloc (p, size);
else
{
__malloc_lock ();
res = dlrealloc (p, size);
__malloc_unlock ();
}
malloc_printf ("(%p, %ld) = %p, called by %p", p, size, res,
caller_return_address ());
return res;
}
/* BSD extension: Same as realloc, just if it fails to allocate new memory,
it frees the incoming pointer. */
extern "C" void *
reallocf (void *p, size_t size)
{
void *res = realloc (p, size);
if (!res && p)
free (p);
return res;
}
extern "C" void *
calloc (size_t nmemb, size_t size)
{
void *res;
if (!use_internal)
res = user_data->calloc (nmemb, size);
else
{
__malloc_lock ();
res = dlcalloc (nmemb, size);
__malloc_unlock ();
}
malloc_printf ("(%ld, %ld) = %p, called by %p", nmemb, size, res,
caller_return_address ());
return res;
}
extern "C" int
posix_memalign (void **memptr, size_t alignment, size_t bytes)
{
save_errno save;
void *res;
if (!use_internal)
return user_data->posix_memalign (memptr, alignment, bytes);
if ((alignment & (alignment - 1)) != 0)
return EINVAL;
__malloc_lock ();
res = dlmemalign (alignment, bytes);
__malloc_unlock ();
if (!res)
return ENOMEM;
if (memptr)
*memptr = res;
return 0;
}
extern "C" void *
memalign (size_t alignment, size_t bytes)
{
void *res;
if (!use_internal)
{
set_errno (ENOSYS);
res = NULL;
}
else
{
__malloc_lock ();
res = dlmemalign (alignment, bytes);
__malloc_unlock ();
}
return res;
}
extern "C" void *
valloc (size_t bytes)
{
void *res;
if (!use_internal)
{
set_errno (ENOSYS);
res = NULL;
}
else
{
__malloc_lock ();
res = dlvalloc (bytes);
__malloc_unlock ();
}
return res;
}
extern "C" size_t
malloc_usable_size (void *p)
{
size_t res;
if (!use_internal)
{
set_errno (ENOSYS);
res = 0;
}
else
{
__malloc_lock ();
res = dlmalloc_usable_size (p);
__malloc_unlock ();
}
return res;
}
extern "C" int
malloc_trim (size_t pad)
{
size_t res;
if (!use_internal)
{
set_errno (ENOSYS);
res = 0;
}
else
{
__malloc_lock ();
res = dlmalloc_trim (pad);
__malloc_unlock ();
}
return res;
}
extern "C" int
mallopt (int p, int v)
{
int res;
if (!use_internal)
{
set_errno (ENOSYS);
res = 0;
}
else
{
__malloc_lock ();
res = dlmallopt (p, v);
__malloc_unlock ();
}
return res;
}
extern "C" void
malloc_stats ()
{
if (!use_internal)
set_errno (ENOSYS);
else
{
__malloc_lock ();
dlmalloc_stats ();
__malloc_unlock ();
}
}
extern "C" struct mallinfo
mallinfo ()
{
struct mallinfo m;
if (!use_internal)
{
memset (&m, 0, sizeof m);
set_errno (ENOSYS);
}
else
{
__malloc_lock ();
m = dlmallinfo ();
__malloc_unlock ();
}
return m;
}
extern "C" char *
strdup (const char *s)
{
char *p;
size_t len = strlen (s) + 1;
if ((p = (char *) malloc (len)) != NULL)
memcpy (p, s, len);
return p;
}
/* We use a critical section to lock access to the malloc data
structures. This permits malloc to be called from different
threads. Note that it does not make malloc reentrant, and it does
not permit a signal handler to call malloc. The malloc code in
newlib will call __malloc_lock and __malloc_unlock at appropriate
times. */
muto NO_COPY mallock;
void
malloc_init ()
{
mallock.init ("mallock");
#ifndef MALLOC_DEBUG
/* Check if malloc is provided by application. If so, redirect all
calls to malloc/free/realloc to application provided. This may
happen if some other dll calls cygwin's malloc, but main code provides
its own malloc */
if (!internal_malloc_determined)
{
extern void *_sigfe_malloc;
/* Decide if we are using our own version of malloc by testing the import
address from user_data. */
use_internal = user_data->malloc == malloc
|| import_address (user_data->malloc) == &_sigfe_malloc;
malloc_printf ("using %s malloc", use_internal ? "internal" : "external");
internal_malloc_determined = true;
}
#endif
}
extern "C" void
__set_ENOMEM ()
{
set_errno (ENOMEM);
}