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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1982, 1986, 1993, 1994
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)uio.h       8.5 (Berkeley) 2/22/94
   32  * $FreeBSD: stable/12/sys/sys/uio.h 331621 2018-03-27 15:20:03Z brooks $
   33  */
   34 
   35 #ifndef _SYS_UIO_H_
   36 #define _SYS_UIO_H_
   37 
   38 #include <sys/cdefs.h>
   39 #include <sys/_types.h>
   40 #include <sys/_iovec.h>
   41 #include <sys/_uio.h>
   42 
   43 #ifndef _SSIZE_T_DECLARED
   44 typedef __ssize_t       ssize_t;
   45 #define _SSIZE_T_DECLARED
   46 #endif
   47 
   48 #ifndef _OFF_T_DECLARED
   49 typedef __off_t off_t;
   50 #define _OFF_T_DECLARED
   51 #endif
   52 
   53 #ifdef _KERNEL
   54 
   55 struct uio {
   56         struct  iovec *uio_iov;         /* scatter/gather list */
   57         int     uio_iovcnt;             /* length of scatter/gather list */
   58         off_t   uio_offset;             /* offset in target object */
   59         ssize_t uio_resid;              /* remaining bytes to process */
   60         enum    uio_seg uio_segflg;     /* address space */
   61         enum    uio_rw uio_rw;          /* operation */
   62         struct  thread *uio_td;         /* owner */
   63 };
   64 
   65 /*
   66  * Limits
   67  *
   68  * N.B.: UIO_MAXIOV must be no less than IOV_MAX from <sys/syslimits.h>
   69  * which in turn must be no less than _XOPEN_IOV_MAX from <limits.h>.  If
   70  * we ever make this tunable (probably pointless), then IOV_MAX should be
   71  * removed from <sys/syslimits.h> and applications would be expected to use
   72  * sysconf(3) to find out the correct value, or else assume the worst
   73  * (_XOPEN_IOV_MAX).  Perhaps UIO_MAXIOV should be simply defined as
   74  * IOV_MAX.
   75  */
   76 #define UIO_MAXIOV      1024            /* max 1K of iov's */
   77 
   78 struct vm_object;
   79 struct vm_page;
   80 struct bus_dma_segment;
   81 
   82 struct uio *cloneuio(struct uio *uiop);
   83 int     copyinfrom(const void * __restrict src, void * __restrict dst,
   84             size_t len, int seg);
   85 int     copyiniov(const struct iovec *iovp, u_int iovcnt, struct iovec **iov,
   86             int error);
   87 int     copyinstrfrom(const void * __restrict src, void * __restrict dst,
   88             size_t len, size_t * __restrict copied, int seg);
   89 int     copyinuio(const struct iovec *iovp, u_int iovcnt, struct uio **uiop);
   90 int     copyout_map(struct thread *td, vm_offset_t *addr, size_t sz);
   91 int     copyout_unmap(struct thread *td, vm_offset_t addr, size_t sz);
   92 int     physcopyin(void *src, vm_paddr_t dst, size_t len);
   93 int     physcopyout(vm_paddr_t src, void *dst, size_t len);
   94 int     physcopyin_vlist(struct bus_dma_segment *src, off_t offset,
   95             vm_paddr_t dst, size_t len);
   96 int     physcopyout_vlist(vm_paddr_t src, struct bus_dma_segment *dst,
   97             off_t offset, size_t len);
   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     uiomove_nofault(void *cp, int n, struct uio *uio);
  103 int     uiomove_object(struct vm_object *obj, off_t obj_size, struct uio *uio);
  104 
  105 #else /* !_KERNEL */
  106 
  107 __BEGIN_DECLS
  108 ssize_t readv(int, const struct iovec *, int);
  109 ssize_t writev(int, const struct iovec *, int);
  110 #if __BSD_VISIBLE
  111 ssize_t preadv(int, const struct iovec *, int, off_t);
  112 ssize_t pwritev(int, const struct iovec *, int, off_t);
  113 #endif
  114 __END_DECLS
  115 
  116 #endif /* _KERNEL */
  117 
  118 #endif /* !_SYS_UIO_H_ */

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