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