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/*
* Allocation and free functions for aligned memory
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#ifndef QEMU_MEMALIGN_H
#define QEMU_MEMALIGN_H
/**
* qemu_try_memalign: Allocate aligned memory
* @alignment: required alignment, in bytes
* @size: size of allocation, in bytes
*
* Allocate memory on an aligned boundary (i.e. the returned
* address will be an exact multiple of @alignment).
* @alignment must be a power of 2, or the function will assert().
* On success, returns allocated memory; on failure, returns NULL.
*
* The memory allocated through this function must be freed via
* qemu_vfree() (and not via free()).
*/
void *qemu_try_memalign(size_t alignment, size_t size);
/**
* qemu_memalign: Allocate aligned memory, without failing
* @alignment: required alignment, in bytes
* @size: size of allocation, in bytes
*
* Allocate memory in the same way as qemu_try_memalign(), but
* abort() with an error message if the memory allocation fails.
*
* The memory allocated through this function must be freed via
* qemu_vfree() (and not via free()).
*/
void *qemu_memalign(size_t alignment, size_t size);
/**
* qemu_vfree: Free memory allocated through qemu_memalign
* @ptr: memory to free
*
* This function must be used to free memory allocated via qemu_memalign()
* or qemu_try_memalign(). (Using the wrong free function will cause
* subtle bugs on Windows hosts.)
*/
void qemu_vfree(void *ptr);
/*
* It's an analog of GLIB's g_autoptr_cleanup_generic_gfree(), used to define
* g_autofree macro.
*/
static inline void qemu_cleanup_generic_vfree(void *p)
{
void **pp = (void **)p;
qemu_vfree(*pp);
}
/*
* Analog of g_autofree, but qemu_vfree is called on cleanup instead of g_free.
*/
#define QEMU_AUTO_VFREE __attribute__((cleanup(qemu_cleanup_generic_vfree)))
#endif
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