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 * 29 * @(#)uio.h 8.5 (Berkeley) 2/22/94 30 * $FreeBSD$ 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; /* scatter/gather list */ 65 int uio_iovcnt; /* length of scatter/gather list */ 66 off_t uio_offset; /* offset in target object */ 67 int uio_resid; /* remaining bytes to process */ 68 enum uio_seg uio_segflg; /* address space */ 69 enum uio_rw uio_rw; /* operation */ 70 struct thread *uio_td; /* owner */ 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 struct uio *cloneuio(struct uio *uiop); 90 int copyinfrom(const void * __restrict src, void * __restrict dst, 91 size_t len, int seg); 92 int copyiniov(struct iovec *iovp, u_int iovcnt, struct iovec **iov, 93 int error); 94 int copyinstrfrom(const void * __restrict src, void * __restrict dst, 95 size_t len, size_t * __restrict copied, int seg); 96 int copyinuio(struct iovec *iovp, u_int iovcnt, struct uio **uiop); 97 void uio_yield(void); 98 int uiomove(void *cp, int n, struct uio *uio); 99 int uiomove_frombuf(void *buf, int buflen, struct uio *uio); 100 int uiomove_fromphys(struct vm_page *ma[], vm_offset_t offset, int n, 101 struct uio *uio); 102 int uiomoveco(void *cp, int n, struct uio *uio, int disposable); 103 104 #else /* !_KERNEL */ 105 106 __BEGIN_DECLS 107 ssize_t readv(int, const struct iovec *, int); 108 ssize_t writev(int, const struct iovec *, int); 109 ssize_t preadv(int, const struct iovec *, int, off_t); 110 ssize_t pwritev(int, const struct iovec *, int, off_t); 111 __END_DECLS 112 113 #endif /* _KERNEL */ 114 115 #endif /* !_SYS_UIO_H_ */ 116