Differential D15047 Diff 41586 head/sys/kern/kern_descrip.c

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head/sys/kern/kern_descrip.c

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	* Copy filecaps structure allocating memory for ioctls array if needed.			* Copy filecaps structure allocating memory for ioctls array if needed.
	*			*
	* The last parameter indicates whether the fdtable is locked. If it is not and			* The last parameter indicates whether the fdtable is locked. If it is not and
	* ioctls are encountered, copying fails and the caller must lock the table.			* ioctls are encountered, copying fails and the caller must lock the table.
	*			*
	* Note that if the table was not locked, the caller has to check the relevant			* Note that if the table was not locked, the caller has to check the relevant
	* sequence counter to determine whether the operation was successful.			* sequence counter to determine whether the operation was successful.
	*/			*/
	int			bool
	filecaps_copy(const struct filecaps src, struct filecaps dst, bool locked)			filecaps_copy(const struct filecaps src, struct filecaps dst, bool locked)
	{			{
	size_t size;			size_t size;

				if (src->fc_ioctls != NULL && !locked)
				return (false);
	dst = src;			dst = src;
	if (src->fc_ioctls == NULL)			if (src->fc_ioctls == NULL)
	return (0);			return (true);
	if (!locked)
	return (1);

	KASSERT(src->fc_nioctls > 0,			KASSERT(src->fc_nioctls > 0,
	("fc_ioctls != NULL, but fc_nioctls=%hd", src->fc_nioctls));			("fc_ioctls != NULL, but fc_nioctls=%hd", src->fc_nioctls));

	size = sizeof(src->fc_ioctls[0]) * src->fc_nioctls;			size = sizeof(src->fc_ioctls[0]) * src->fc_nioctls;
	dst->fc_ioctls = malloc(size, M_FILECAPS, M_WAITOK);			dst->fc_ioctls = malloc(size, M_FILECAPS, M_WAITOK);
	bcopy(src->fc_ioctls, dst->fc_ioctls, size);			bcopy(src->fc_ioctls, dst->fc_ioctls, size);
	return (0);			return (true);
	}			}

	static u_long *			static u_long *
	filecaps_copy_prep(const struct filecaps *src)			filecaps_copy_prep(const struct filecaps *src)
	{			{
	u_long *ioctls;			u_long *ioctls;
	size_t size;			size_t size;

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