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. 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 * 29 * @(#)uio.h 8.5 (Berkeley) 2/22/94 30 */ 31 32 #ifndef _SYS__UIO_H_ 33 #define _SYS__UIO_H_ 34 35 /* 36 * Do not include this header outside _KERNEL or _KERNEL_STRUCTURES scopes. 37 * Used in <sys/user.h>. 38 */ 39 40 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 41 enum uio_rw { 42 UIO_READ, 43 UIO_WRITE 44 }; 45 46 /* Segment flag values. */ 47 enum uio_seg { 48 UIO_USERSPACE, /* from user data space */ 49 UIO_SYSSPACE, /* from system space */ 50 UIO_NOCOPY /* don't copy, already in object */ 51 }; 52 53 struct iovec; 54 struct thread; 55 56 /* 57 * uio_td is primarily used for USERSPACE transfers, but some devices 58 * like ttys may also use it to get at the process. 59 * 60 * NOTE: uio_resid: Previously used int and FreeBSD decided to use ssize_t, 61 * but after reviewing use cases and in particular the fact that the 62 * iov uses an unsigned quantity, DragonFly will use the (unsigned) 63 * size_t. 64 */ 65 struct uio { 66 struct iovec *uio_iov; 67 int uio_iovcnt; 68 off_t uio_offset; 69 size_t uio_resid; 70 enum uio_seg uio_segflg; 71 enum uio_rw uio_rw; 72 struct thread *uio_td; 73 }; 74 #endif /* _KERNEL || _KERNEL_STRUCTURES */ 75 76 #endif /* !_SYS__UIO_H_ */ 77