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/kern/subr_xxx.c

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    1 /*
    2  * Copyright (c) 1982, 1986, 1991, 1993
    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. 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.
   20  *
   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
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)subr_xxx.c  8.1 (Berkeley) 6/10/93
   34  * $FreeBSD: releng/5.1/sys/kern/subr_xxx.c 112569 2003-03-25 00:07:06Z jake $
   35  */
   36 
   37 /*
   38  * Miscellaneous trivial functions.
   39  */
   40 #include <sys/param.h>
   41 #include <sys/systm.h>
   42 
   43 /*
   44  * Return error for operation not supported
   45  * on a specific object or file type.
   46  */
   47 int
   48 eopnotsupp()
   49 {
   50 
   51         return (EOPNOTSUPP);
   52 }
   53 
   54 /*
   55  * Generic null operation, always returns success.
   56  */
   57 int
   58 nullop()
   59 {
   60 
   61         return (0);
   62 }
   63 
   64 #include <sys/conf.h>
   65 
   66 /*
   67  * Unsupported devswitch functions (e.g. for writing to read-only device).
   68  * XXX may belong elsewhere.
   69  */
   70 
   71 int
   72 noopen(dev, flags, fmt, td)
   73         dev_t dev;
   74         int flags;
   75         int fmt;
   76         struct thread *td;
   77 {
   78 
   79         return (ENODEV);
   80 }
   81 
   82 int
   83 noclose(dev, flags, fmt, td)
   84         dev_t dev;
   85         int flags;
   86         int fmt;
   87         struct thread *td;
   88 {
   89 
   90         return (ENODEV);
   91 }
   92 
   93 int
   94 noread(dev, uio, ioflag)
   95         dev_t dev;
   96         struct uio *uio;
   97         int ioflag;
   98 {
   99 
  100         return (ENODEV);
  101 }
  102 
  103 int
  104 nowrite(dev, uio, ioflag)
  105         dev_t dev;
  106         struct uio *uio;
  107         int ioflag;
  108 {
  109 
  110         return (ENODEV);
  111 }
  112 
  113 int
  114 noioctl(dev, cmd, data, flags, td)
  115         dev_t dev;
  116         u_long cmd;
  117         caddr_t data;
  118         int flags;
  119         struct thread *td;
  120 {
  121 
  122         return (ENODEV);
  123 }
  124 
  125 int
  126 nokqfilter(dev, kn)
  127         dev_t dev;
  128         struct knote *kn;
  129 {
  130 
  131         return (1);
  132 }
  133 
  134 int
  135 nommap(dev, offset, paddr, nprot)
  136         dev_t dev;
  137         vm_offset_t offset;
  138         vm_paddr_t *paddr;
  139         int nprot;
  140 {
  141 
  142         return (ENODEV);
  143 }
  144 
  145 int
  146 nodump(void *arg, void *virtual __unused, vm_offset_t physical __unused, off_t offset __unused, size_t length __unused)
  147 {
  148 
  149         return (ENODEV);
  150 }
  151 
  152 /*
  153  * Null devswitch functions (for when the operation always succeeds).
  154  * XXX may belong elsewhere.
  155  * XXX not all are here (e.g., seltrue() isn't).
  156  */
  157 
  158 /*
  159  * XXX this is probably bogus.  Any device that uses it isn't checking the
  160  * minor number.
  161  */
  162 int
  163 nullopen(dev, flags, fmt, td)
  164         dev_t dev;
  165         int flags;
  166         int fmt;
  167         struct thread *td;
  168 {
  169 
  170         return (0);
  171 }
  172 
  173 int
  174 nullclose(dev, flags, fmt, td)
  175         dev_t dev;
  176         int flags;
  177         int fmt;
  178         struct thread *td;
  179 {
  180 
  181         return (0);
  182 }

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