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      1 /*	$NetBSD: uio.h,v 1.36 2011/07/27 13:20:07 uebayasi Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1982, 1986, 1993, 1994
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  *
     31  *	@(#)uio.h	8.5 (Berkeley) 2/22/94
     32  */
     33 
     34 #ifndef _SYS_UIO_H_
     35 #define	_SYS_UIO_H_
     36 
     37 #ifdef _KERNEL
     38 #ifndef __UIO_EXPOSE
     39 #define __UIO_EXPOSE
     40 #endif
     41 #endif
     42 
     43 #include <machine/ansi.h>
     44 #include <sys/featuretest.h>
     45 
     46 #ifdef	_BSD_SIZE_T_
     47 typedef	_BSD_SIZE_T_	size_t;
     48 #undef	_BSD_SIZE_T_
     49 #endif
     50 
     51 #ifdef	_BSD_SSIZE_T_
     52 typedef	_BSD_SSIZE_T_	ssize_t;
     53 #undef	_BSD_SSIZE_T_
     54 #endif
     55 
     56 struct iovec {
     57 	void	*iov_base;	/* Base address. */
     58 	size_t	 iov_len;	/* Length. */
     59 };
     60 
     61 #if defined(_NETBSD_SOURCE)
     62 #include <sys/ansi.h>
     63 
     64 #ifndef	off_t
     65 typedef	__off_t		off_t;	/* file offset */
     66 #define	off_t		__off_t
     67 #endif
     68 
     69 enum	uio_rw { UIO_READ, UIO_WRITE };
     70 
     71 /* Segment flag values. */
     72 enum uio_seg {
     73 	UIO_USERSPACE,		/* from user data space */
     74 	UIO_SYSSPACE		/* from system space */
     75 };
     76 
     77 #ifdef __UIO_EXPOSE
     78 
     79 struct vmspace;
     80 
     81 struct uio {
     82 	struct	iovec *uio_iov;	/* pointer to array of iovecs */
     83 	int	uio_iovcnt;	/* number of iovecs in array */
     84 	off_t	uio_offset;	/* offset into file this uio corresponds to */
     85 	size_t	uio_resid;	/* residual i/o count */
     86 	enum	uio_rw uio_rw;	/* see above */
     87 	struct	vmspace *uio_vmspace;
     88 };
     89 #define	UIO_SETUP_SYSSPACE(uio)	uio_setup_sysspace(uio)
     90 
     91 #endif /* __UIO_EXPOSE */
     92 
     93 /*
     94  * Limits
     95  */
     96 /* Deprecated: use IOV_MAX from <limits.h> instead. */
     97 #define UIO_MAXIOV	1024		/* max 1K of iov's */
     98 #endif /* _NETBSD_SOURCE */
     99 
    100 #ifdef _KERNEL
    101 
    102 /* 8 on stack, more will be dynamically allocated. */
    103 #define UIO_SMALLIOV	8
    104 
    105 void uio_setup_sysspace(struct uio *);
    106 #endif
    107 
    108 #ifndef	_KERNEL
    109 #include <sys/cdefs.h>
    110 
    111 __BEGIN_DECLS
    112 #if defined(_NETBSD_SOURCE)
    113 ssize_t preadv(int, const struct iovec *, int, off_t);
    114 ssize_t pwritev(int, const struct iovec *, int, off_t);
    115 #endif /* _NETBSD_SOURCE */
    116 ssize_t	readv(int, const struct iovec *, int);
    117 ssize_t	writev(int, const struct iovec *, int);
    118 __END_DECLS
    119 #else
    120 int ureadc(int, struct uio *);
    121 #endif /* !_KERNEL */
    122 
    123 #endif /* !_SYS_UIO_H_ */
    124