D45422.id139265.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 +44,37 @@
	size_t iov_len; /* Length. */
	};

	+#if __BSD_VISIBLE
	+#define IOVEC_INIT(_iovp, base, len) __extension__ ({ \
	+ struct iovec *iovp = (_iovp); \
	+ iovp->iov_len = (len); \
	+ iovp->iov_base = (base); \
	+})
	+
	+/* String with length including NUL terminator */
	+#define IOVEC_INIT_STR(iovp, _str) __extension__ ({ \
	+ void *str = (_str); \
	+ IOVEC_INIT(iovp, str, strlen(str) + 1); \
	+})
	+
	+/*
	+ * Object with size from sizeof()
	+ *
	+ * NB: obj argument is unavoidably evaluted twice. This should be
	+ * harmless in reasionable use.
	+ */
	+#define IOVEC_INIT_OBJ(iovp, obj) __extension__ ({ \
	+ IOVEC_INIT(iovp, &(obj), sizeof(obj)); \
	+})
	+
	+#define IOVEC_ADVANCE(_iovp, amt) __extension__ ({ \
	+ struct iovec *iovp = (_iovp); \
	+ size_t amount = (amt); \
	+ KASSERT(amount <= iovp->iov_len, ("%s: amount %zu > iov_len \
	+ %zu", __func__, amount, iovp->iov_len)); \
	+ iovp->iov_len -= amount; \
	+ iovp->iov_base = (char *)iovp->iov_base + amount; \
	+})
	+#endif /* __BSD_VISIBLE */
	+
	#endif /* !_SYS__IOVEC_H_ */