Method unmapObject

src/common/isc_sync.cpp:2004–2036

void SharedMemoryBase::unmapObject(CheckStatusWrapper* statusVector, UCHAR** object_pointer, ULONG object_length)
{
/**************************************
 *
 *	I S C _ u n m a p _ o b j e c t
 *
 **************************************
 *
 * Functional description
 *	Try to unmap an object given a file mapping.
 *	Zero the object pointer after a successful unmap.
 *
 **************************************/
	const size_t page_size = getSystemPageSize(statusVector);
	if (!page_size)
		return;

	// Compute the start and end page-aligned addresses which contain the mapped object.

	char* const start = (char*) ((U_IPTR) (*object_pointer) & ~(page_size - 1));
	char* const end =
		(char*) ((U_IPTR) ((*object_pointer + object_length) + (page_size - 1)) & ~(page_size - 1));
	const size_t length = end - start;

	if (munmap(start, length) == -1)
	{
		error(statusVector, "munmap", errno);
		return; // false;
	}

	*object_pointer = NULL;
	return; // true;
}
#endif // HAVE_MMAP