2 * Copyright (c) 1982, 1986, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
33 * @(#)uio.h 8.5 (Berkeley) 2/22/94
34 * $FreeBSD: src/sys/sys/uio.h,v 1.11.2.1 2001/09/28 16:58:35 dillon Exp $
40 #include <sys/_iovec.h>
43 #include <sys/types.h>
46 #include <sys/param.h>
48 #ifndef _SYS_MALLOC_H_
49 #include <sys/malloc.h> /* Needed to inline iovec_free(). */
52 enum uio_rw { UIO_READ, UIO_WRITE };
54 /* Segment flag values. */
56 UIO_USERSPACE, /* from user data space */
57 UIO_SYSSPACE, /* from system space */
58 UIO_NOCOPY /* don't copy, already in object */
61 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
64 * uio_td is primarily used for USERSPACE transfers, but some devices
65 * like ttys may also use it to get at the process.
67 * NOTE: uio_resid: Previously used int and FreeBSD decided to use ssize_t,
68 * but after reviewing use cases and in particular the fact that the
69 * iov uses an unsigned quantity, DragonFly will use the (unsigned)
75 struct iovec *uio_iov;
79 enum uio_seg uio_segflg;
81 struct thread *uio_td;
87 #define UIO_MAXIOV 1024 /* max 1K of iov's */
88 #define UIO_SMALLIOV 8 /* 8 on stack, else malloc */
97 int uiomove (caddr_t, size_t, struct uio *);
98 int uiomovebp (struct buf *, caddr_t, size_t, struct uio *);
99 int uiomovez (size_t, struct uio *);
100 int uiomove_frombuf (void *buf, size_t buflen, struct uio *uio);
101 int uiomove_fromphys(struct vm_page *ma[], vm_offset_t offset,
102 size_t n, struct uio *uio);
103 int uioread (int, struct uio *, struct vm_object *, int *);
104 int iovec_copyin(struct iovec *, struct iovec **, struct iovec *,
111 iovec_free(struct iovec **kiov, struct iovec *siov)
121 #include <sys/cdefs.h>
124 ssize_t readv(int, const struct iovec *, int);
125 ssize_t writev(int, const struct iovec *, int);
126 ssize_t preadv(int, const struct iovec *, int, off_t);
127 ssize_t pwritev(int, const struct iovec *, int, off_t);
132 #endif /* !_SYS_UIO_H_ */