Function filecaps_copy

freebsd/kern/kern_descrip.c:1652–1670

* Copy filecaps structure allocating memory for ioctls array if needed. * * 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. * * 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.
 */
bool
filecaps_copy(const struct filecaps *src, struct filecaps *dst, bool locked)
{
	size_t size;

	if (src->fc_ioctls != NULL && !locked)
		return (false);
	memcpy(dst, src, sizeof(*src));
	if (src->fc_ioctls == NULL)
		return (true);

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

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

static u_long *
filecaps_copy_prep(const struct filecaps *src)