D45422.1794281826.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 +44,22 @@
	size_t iov_len; /* Length. */
	};

	+#define IOVEC_INIT(iovp, base, len) do { \
	+ (iovp)->iov_base = (base); \
	+ (iovp)->iov_len = (len); \
	+} while(0)
	+
	+#define IOVEC_INIT_STR(iovp, str) \
	+ IOVEC_INIT(iovp, str, strlen(str) + 1)
	+#define IOVEC_INIT_OBJ(iovp, obj) \
	+ IOVEC_INIT(iovp, &(obj), sizeof(obj))
	+
	+#define IOVEC_ADVANCE(iovp, amt) do { \
	+ size_t amount = (amt); \
	+ KASSERT(amount <= (iovp)->iov_len, ("%s: amount %zu > iov_len \
	+ %zu", __func__, amount, (iovp)->iov_len)); \
	+ (iovp)->iov_base = (char *)((iovp)->iov_base) + amount; \
	+ (iovp)->iov_len -= amount; \
	+} while(0)
	+
	#endif /* !_SYS__IOVEC_H_ */