sys/sys/uio.h

   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  * $FreeBSD: src/sys/sys/uio.h,v 1.11.2.1 2001/09/28 16:58:35 dillon Exp $
  31  */
  32
  33 #ifndef _SYS_UIO_H_
  34 #define _SYS_UIO_H_
  35
  36 #include <sys/cdefs.h>
  37 #include <sys/_iovec.h>
  38 #include <machine/stdint.h>
  39
  40 #if __BSD_VISIBLE
  41 #ifndef _OFF_T_DECLARED
  42 typedef __off_t         off_t;
  43 #define _OFF_T_DECLARED
  44 #endif
  45 #endif
  46
  47 /* The size_t is expected to be provided by <sys/_iovec.h> */
  48
  49 #ifndef _SSIZE_T_DECLARED
  50 typedef __ssize_t       ssize_t;
  51 #define _SSIZE_T_DECLARED
  52 #endif
  53
  54 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  55 #include <sys/_uio.h>                   /* struct uio and enums */
  56
  57 /*
  58  * Limits
  59  */
  60 #define UIO_MAXIOV      1024            /* max 1K of iov's */
  61 #define UIO_SMALLIOV    8               /* 8 on stack, else malloc */
  62
  63 #endif /* _KERNEL || _KERNEL_STRUCTURES */
  64
  65 #if defined(_KERNEL)
  66 struct buf;
  67 struct vm_object;
  68 struct vm_page;
  69
  70 int     uiomove (caddr_t, size_t, struct uio *);
  71 int     uiomove_nofault (caddr_t, size_t, struct uio *);
  72 int     uiomovebp (struct buf *, caddr_t, size_t, struct uio *);
  73 int     uiomovez (size_t, struct uio *);
  74 int     uiomove_frombuf (void *buf, size_t buflen, struct uio *uio);
  75 int     uiomove_fromphys(struct vm_page *ma[], vm_offset_t offset,
  76                             size_t n, struct uio *uio);
  77 int     uioread (int, struct uio *, struct vm_object *, int *);
  78 int     iovec_copyin(const struct iovec *, struct iovec **, struct iovec *,
  79                             int, size_t *);
  80
  81 #ifdef MALLOC_DECLARE
  82 MALLOC_DECLARE(M_IOV);  /* only if <sys/malloc.h> included before! */
  83 #endif
  84
  85 #ifdef MALLOC_DEFINE
  86 #include <sys/_null.h>                  /* XXX, visibility */
  87 /*
  88  * MPSAFE
  89  */
  90 static __inline void
  91 iovec_free(struct iovec **kiov, struct iovec *siov)
  92 {
  93         if (*kiov != siov) {
  94                 kfree(*kiov, M_IOV);
  95                 *kiov = NULL;
  96         }
  97 }
  98 #endif
  99 #endif /* _KERNEL */
 100
 101 #ifndef _KERNEL
 102 __BEGIN_DECLS
 103 ssize_t readv(int, const struct iovec *, int);
 104 ssize_t writev(int, const struct iovec *, int);
 105 #if __BSD_VISIBLE
 106 ssize_t preadv(int, const struct iovec *, int, off_t);
 107 ssize_t pwritev(int, const struct iovec *, int, off_t);
 108 #endif
 109 __END_DECLS
 110 #endif /* !_KERNEL */
 111
 112 #endif /* !_SYS_UIO_H_ */