1 /* $OpenBSD: uio.h,v 1.19 2018/08/20 16:00:22 mpi Exp $ */ 2 /* $NetBSD: uio.h,v 1.12 1996/02/09 18:25:45 christos Exp $ */ 3 4 /* 5 * Copyright (c) 1982, 1986, 1993, 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)uio.h 8.5 (Berkeley) 2/22/94 33 */ 34 35 #ifndef _SYS_UIO_H_ 36 #define _SYS_UIO_H_ 37 38 #include <sys/cdefs.h> 39 #include <sys/_types.h> 40 41 #ifndef _SIZE_T_DEFINED_ 42 #define _SIZE_T_DEFINED_ 43 typedef __size_t size_t; 44 #endif 45 46 #ifndef _SSIZE_T_DEFINED_ 47 #define _SSIZE_T_DEFINED_ 48 typedef __ssize_t ssize_t; 49 #endif 50 51 struct iovec { 52 void *iov_base; /* Base address. */ 53 size_t iov_len; /* Length. */ 54 }; 55 56 #if __BSD_VISIBLE /* needed by kdump */ 57 enum uio_rw { UIO_READ, UIO_WRITE }; 58 59 /* Segment flag values. */ 60 enum uio_seg { 61 UIO_USERSPACE, /* from user data space */ 62 UIO_SYSSPACE /* from system space */ 63 }; 64 #endif /* __BSD_VISIBLE */ 65 66 #ifdef _KERNEL 67 struct uio { 68 struct iovec *uio_iov; /* pointer to array of iovecs */ 69 int uio_iovcnt; /* number of iovecs in array */ 70 off_t uio_offset; /* offset into file this uio corresponds to */ 71 size_t uio_resid; /* residual i/o count */ 72 enum uio_seg uio_segflg; /* see above */ 73 enum uio_rw uio_rw; /* see above */ 74 struct proc *uio_procp;/* associated thread or NULL */ 75 }; 76 77 /* 78 * Limits 79 */ 80 #define UIO_SMALLIOV 8 /* 8 on stack, else malloc */ 81 #endif /* _KERNEL */ 82 83 #if __BSD_VISIBLE 84 #define UIO_MAXIOV 1024 /* Deprecated, use IOV_MAX instead */ 85 #endif 86 87 #ifndef _KERNEL 88 __BEGIN_DECLS 89 #if __BSD_VISIBLE 90 ssize_t preadv(int, const struct iovec *, int, __off_t); 91 ssize_t pwritev(int, const struct iovec *, int, __off_t); 92 #endif /* __BSD_VISIBLE */ 93 ssize_t readv(int, const struct iovec *, int); 94 ssize_t writev(int, const struct iovec *, int); 95 __END_DECLS 96 #else 97 int ureadc(int c, struct uio *); 98 99 struct file; 100 int iovec_copyin(const struct iovec *, struct iovec **, struct iovec *, 101 unsigned int, size_t *); 102 void iovec_free(struct iovec *, unsigned int ); 103 int dofilereadv(struct proc *, int, struct uio *, int, register_t *); 104 int dofilewritev(struct proc *, int, struct uio *, int, register_t *); 105 106 #endif /* !_KERNEL */ 107 108 #endif /* !_SYS_UIO_H_ */ 109