1 uio.h

     1 /*-

     2  * Copyright (c) 1982, 1986, 1993, 1994

     3  *	The Regents of the University of California.  All rights reserved.

     4  *

     5  * Redistribution and use in source and binary forms, with or without

     6  * modification, are permitted provided that the following conditions

     7  * are met:

     8  * 1. Redistributions of source code must retain the above copyright

     9  *    notice, this list of conditions and the following disclaimer.

    10  * 2. Redistributions in binary form must reproduce the above copyright

    11  *    notice, this list of conditions and the following disclaimer in the

    12  *    documentation and/or other materials provided with the distribution.

    13  * 4. Neither the name of the University nor the names of its contributors

    14  *    may be used to endorse or promote products derived from this software

    15  *    without specific prior written permission.

    16  *

    17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

    18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

    20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

    21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

    22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

    23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

    24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

    25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

    26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

    27  * SUCH DAMAGE.

    28  * © Portions copyright (c) 2007 Symbian Software Ltd. All rights reserved.

    29  *	@(#)uio.h	8.5 (Berkeley) 2/22/94

    30  * $FreeBSD: src/sys/sys/uio.h,v 1.39 2005/07/07 18:17:55 jhb Exp $

    31  */

    32 

    33 #ifndef _SYS_UIO_H_

    34 #define	_SYS_UIO_H_

    35 

    36 #include <sys/cdefs.h>

    37 #include <sys/_types.h>

    38 #include <sys/_iovec.h>

    39 

    40 #ifndef _SSIZE_T_DECLARED

    41 typedef	__ssize_t	ssize_t;

    42 #define	_SSIZE_T_DECLARED

    43 #endif

    44 

    45 #ifndef _OFF_T_DECLARED

    46 typedef	__off_t	off_t;

    47 #define	_OFF_T_DECLARED

    48 #endif

    49 

    50 #if __BSD_VISIBLE

    51 enum	uio_rw { UIO_READ, UIO_WRITE };

    52 

    53 /* Segment flag values. */

    54 enum uio_seg {

    55 	UIO_USERSPACE,		/* from user data space */

    56 	UIO_SYSSPACE,		/* from system space */

    57 	UIO_NOCOPY		/* don't copy, already in object */

    58 };

    59 #endif

    60 

    61 #ifdef _KERNEL

    62 

    63 struct uio {

    64 	struct	iovec *uio_iov;

    65 	int	uio_iovcnt;

    66 	off_t	uio_offset;

    67 	int	uio_resid;

    68 	enum	uio_seg uio_segflg;

    69 	enum	uio_rw uio_rw;

    70 	struct	thread *uio_td;

    71 };

    72 

    73 /*

    74  * Limits

    75  *

    76  * N.B.: UIO_MAXIOV must be no less than IOV_MAX from <sys/syslimits.h>

    77  * which in turn must be no less than _XOPEN_IOV_MAX from <limits.h>.  If

    78  * we ever make this tunable (probably pointless), then IOV_MAX should be

    79  * removed from <sys/syslimits.h> and applications would be expected to use

    80  * sysconf(3) to find out the correct value, or else assume the worst

    81  * (_XOPEN_IOV_MAX).  Perhaps UIO_MAXIOV should be simply defined as

    82  * IOV_MAX.

    83  */

    84 #define UIO_MAXIOV	1024		/* max 1K of iov's */

    85 

    86 struct vm_object;

    87 struct vm_page;

    88 

    89 #else /* !_KERNEL */

    90 

    91 __BEGIN_DECLS

    92 IMPORT_C

    93 ssize_t	readv(int, const struct iovec *, int);

    94 IMPORT_C

    95 ssize_t	writev(int, const struct iovec *, int);

    96 __END_DECLS

    97 

    98 #endif /* _KERNEL */

    99 

   100 #endif /* !_SYS_UIO_H_ */