mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-08 14:20:07 +00:00
90 lines
2.9 KiB
C
90 lines
2.9 KiB
C
/* Redirection of malloc inside the dynamic linker.
|
|
Copyright (C) 2020-2024 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
/* The dynamic linker needs to use its own minimal malloc before libc
|
|
has been relocated, and the libc malloc afterwards. The active
|
|
malloc implementation is reached via the __rtld_* function pointers
|
|
declared below. They are initialized to the minimal malloc by
|
|
__rtld_malloc_init_stubs, and set to the final implementation by
|
|
__rtld_malloc_init_real. */
|
|
|
|
#ifndef _RTLD_MALLOC_H
|
|
#define _RTLD_MALLOC_H
|
|
|
|
#if IS_IN (rtld)
|
|
|
|
extern __typeof (calloc) *__rtld_calloc attribute_hidden;
|
|
extern __typeof (free) *__rtld_free attribute_hidden;
|
|
extern __typeof (malloc) *__rtld_malloc attribute_hidden;
|
|
extern __typeof (realloc) *__rtld_realloc attribute_hidden;
|
|
|
|
/* Wrapper functions which call through the function pointers above.
|
|
Note that it is not supported to take the address of those
|
|
functions. Instead the function pointers must be used
|
|
directly. */
|
|
|
|
__extern_inline void *
|
|
calloc (size_t a, size_t b)
|
|
{
|
|
return __rtld_calloc (a, b);
|
|
}
|
|
|
|
__extern_inline void
|
|
free (void *ptr)
|
|
{
|
|
__rtld_free (ptr);
|
|
}
|
|
|
|
__extern_inline void *
|
|
malloc (size_t size)
|
|
{
|
|
return __rtld_malloc (size);
|
|
}
|
|
|
|
__extern_inline void *
|
|
realloc (void *ptr, size_t size)
|
|
{
|
|
return __rtld_realloc (ptr, size);
|
|
}
|
|
|
|
/* Called after the first self-relocation to activate the minimal malloc
|
|
implementation. */
|
|
void __rtld_malloc_init_stubs (void) attribute_hidden;
|
|
|
|
/* Return false if the active malloc is the ld.so minimal malloc, true
|
|
if it is the full implementation from libc.so. */
|
|
_Bool __rtld_malloc_is_complete (void) attribute_hidden;
|
|
|
|
/* Called shortly before the final self-relocation (when RELRO
|
|
variables are still writable) to activate the real malloc
|
|
implementation. MAIN_MAP is the link map of the executable. */
|
|
struct link_map;
|
|
void __rtld_malloc_init_real (struct link_map *main_map) attribute_hidden;
|
|
|
|
#else /* !IS_IN (rtld) */
|
|
|
|
/* This allows static/non-rtld builds to get a pointer to the
|
|
functions, in the same way that is required inside rtld. */
|
|
# define __rtld_calloc (&calloc)
|
|
# define __rtld_free (&free)
|
|
# define __rtld_malloc (&malloc)
|
|
# define __rtld_realloc (&realloc)
|
|
|
|
#endif /* !IS_IN (rtld) */
|
|
#endif /* _RTLD_MALLOC_H */
|