4.1cBSD/a/sys/h/uio.h

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/*	uio.h	4.1	82/09/04	*/

struct iovec {
	caddr_t	iov_base;
	int	iov_len;
};

struct uio {
	struct	iovec *uio_iov;
	int	uio_iovcnt;
	int	uio_offset;
	int	uio_segflg;
	int	uio_resid;
};

enum	uio_rw { UIO_READ, UIO_WRITE };