6 #define PTR_ALIGN(ptr, mask) \
7 (char *)((uintptr_t)((ptr) + (mask)) & ~(mask))
13 void *fio_memalign(size_t alignment, size_t size)
15 struct align_footer *f;
16 void *ptr, *ret = NULL;
18 assert(!(alignment & (alignment - 1)));
20 ptr = malloc(size + alignment + sizeof(*f) - 1);
22 ret = PTR_ALIGN(ptr, alignment - 1);
24 f->offset = (uintptr_t) ret - (uintptr_t) ptr;
30 void fio_memfree(void *ptr, size_t size)
32 struct align_footer *f = ptr + size;
34 free(ptr - f->offset);