D45422.diff
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	diff --git a/sys/sys/_iovec.h b/sys/sys/_iovec.h
	--- a/sys/sys/_iovec.h
	+++ b/sys/sys/_iovec.h
	@@ -44,4 +44,28 @@
	size_t iov_len; /* Length. */
	};

	+#ifdef _KERNEL
	+#define IOVEC_INIT(iovp, base, len) \
	+ *(iovp) = (struct iovec){ .iov_base = (base), .iov_len = (len) }
	+
	+/* String with length including NUL terminator */
	+#define IOVEC_INIT_CSTR(iovp, str) do { \
	+ void *__str = (str); \
	+ IOVEC_INIT(iovp, __str, strlen(__str) + 1); \
	+} while(0)
	+
	+/* Object with size from sizeof() */
	+#define IOVEC_INIT_OBJ(iovp, obj) \
	+ IOVEC_INIT(iovp, &(obj), sizeof(obj))
	+
	+#define IOVEC_ADVANCE(iovp, amt) do { \
	+ struct iovec *__iovp = (iovp); \
	+ size_t __amt = (amt); \
	+ KASSERT(__amt <= __iovp->iov_len, ("%s: amount %zu > iov_len \
	+ %zu", __func__, __amt, __iovp->iov_len)); \
	+ __iovp->iov_len -= __amt; \
	+ __iovp->iov_base = (char *)__iovp->iov_base + __amt; \
	+} while(0)
	+#endif /* _KERNEL */
	+
	#endif /* !_SYS__IOVEC_H_ */