The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/uio.h

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    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: releng/9.0/sys/sys/uio.h 223889 2011-07-09 15:21:10Z kib $
   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         ssize_t 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 int     copyout_map(struct thread *td, vm_offset_t *addr, size_t sz);
   98 int     copyout_unmap(struct thread *td, vm_offset_t addr, size_t sz);
   99 int     uiomove(void *cp, int n, struct uio *uio);
  100 int     uiomove_frombuf(void *buf, int buflen, struct uio *uio);
  101 int     uiomove_fromphys(struct vm_page *ma[], vm_offset_t offset, int n,
  102             struct uio *uio);
  103 int     uiomove_nofault(void *cp, int n, struct uio *uio);
  104 int     uiomoveco(void *cp, int n, struct uio *uio, int disposable);
  105 
  106 #else /* !_KERNEL */
  107 
  108 __BEGIN_DECLS
  109 ssize_t readv(int, const struct iovec *, int);
  110 ssize_t writev(int, const struct iovec *, int);
  111 #if __BSD_VISIBLE
  112 ssize_t preadv(int, const struct iovec *, int, off_t);
  113 ssize_t pwritev(int, const struct iovec *, int, off_t);
  114 #endif
  115 __END_DECLS
  116 
  117 #endif /* _KERNEL */
  118 
  119 #endif /* !_SYS_UIO_H_ */

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