Function zfree

freebsd/kern/kern_malloc.c:906–939

* zfree: * * Zero then free a block of memory allocated by malloc. * * This routine may not block. */

 *	This routine may not block.
 */
void
zfree(void *addr, struct malloc_type *mtp)
{
	uma_zone_t zone;
	uma_slab_t slab;
	u_long size;

#ifdef MALLOC_DEBUG
	if (free_dbg(&addr, mtp) != 0)
		return;
#endif
	/* free(NULL, ...) does nothing */
	if (addr == NULL)
		return;

	vtozoneslab((vm_offset_t)addr & (~UMA_SLAB_MASK), &zone, &slab);
	if (slab == NULL)
		panic("free: address %p(%p) has not been allocated.\n",
		    addr, (void *)((u_long)addr & (~UMA_SLAB_MASK)));

	if (__predict_true(!malloc_large_slab(slab))) {
		size = zone->uz_size;
#ifdef INVARIANTS
		free_save_type(addr, mtp, size);
#endif
		explicit_bzero(addr, size);
		uma_zfree_arg(zone, addr, slab);
	} else {
		size = malloc_large_size(slab);
		explicit_bzero(addr, size);
		free_large(addr, size);
	}
	malloc_type_freed(mtp, size);
}

/*
 *	realloc: change the size of a memory block