uio.h revision 111567
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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)uio.h 8.5 (Berkeley) 2/22/94 34 * $FreeBSD: head/sys/sys/uio.h 111567 2003-02-26 20:16:58Z mike $ 35 */ 36 37#ifndef _SYS_UIO_H_ 38#define _SYS_UIO_H_ 39 40#include <sys/cdefs.h> 41#include <sys/_types.h> 42#include <sys/_iovec.h> 43 44#ifndef _SSIZE_T_DECLARED 45typedef __ssize_t ssize_t; 46#define _SSIZE_T_DECLARED 47#endif 48 49#if __BSD_VISIBLE 50enum uio_rw { UIO_READ, UIO_WRITE }; 51 52/* Segment flag values. */ 53enum uio_seg { 54 UIO_USERSPACE, /* from user data space */ 55 UIO_SYSSPACE, /* from system space */ 56 UIO_NOCOPY /* don't copy, already in object */ 57}; 58#endif 59 60#ifdef _KERNEL 61 62struct uio { 63 struct iovec *uio_iov; 64 int uio_iovcnt; 65 off_t uio_offset; 66 int uio_resid; 67 enum uio_seg uio_segflg; 68 enum uio_rw uio_rw; 69 struct thread *uio_td; 70}; 71 72/* 73 * Limits 74 * 75 * N.B.: UIO_MAXIOV must be no less than IOV_MAX from <sys/syslimits.h> 76 * which in turn must be no less than _XOPEN_IOV_MAX from <limits.h>. If 77 * we ever make this tunable (probably pointless), then IOV_MAX should be 78 * removed from <sys/syslimits.h> and applications would be expected to use 79 * sysconf(3) to find out the correct value, or else assume the worst 80 * (_XOPEN_IOV_MAX). Perhaps UIO_MAXIOV should be simply defined as 81 * IOV_MAX. 82 */ 83#define UIO_MAXIOV 1024 /* max 1K of iov's */ 84#define UIO_SMALLIOV 8 /* 8 on stack, else malloc */ 85 86struct vm_object; 87 88void uio_yield(void); 89int uiomove(caddr_t, int, struct uio *); 90int uiomoveco(caddr_t, int, struct uio *, struct vm_object *, int); 91int uioread(int, struct uio *, struct vm_object *, int *); 92int copyinfrom(const void *src, void *dst, size_t len, int seg); 93int copyinstrfrom(const void *src, void *dst, size_t len, 94 size_t *copied, int seg); 95 96#else /* !_KERNEL */ 97 98__BEGIN_DECLS 99ssize_t readv(int, const struct iovec *, int); 100ssize_t writev(int, const struct iovec *, int); 101__END_DECLS 102 103#endif /* _KERNEL */ 104 105#endif /* !_SYS_UIO_H_ */ 106