FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_xxx.c

     /*
      * Copyright (c) 1982, 1986, 1991, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)subr_xxx.c  8.1 (Berkeley) 6/10/93
     * $FreeBSD$
     */
    
    /*
     * Miscellaneous trivial functions.
     */
    #include <sys/param.h>
    #include <sys/systm.h>
    
    /*
     * Return error for operation not supported
     * on a specific object or file type.
     */
    int
    eopnotsupp()
    {
    
            return (EOPNOTSUPP);
    }
    
    /*
     * Return error for an inval operation
     * on a specific object or file type.
     */
    int
    einval()
    {
    
            return (EINVAL);
    }
    
    /*
     * Generic null operation, always returns success.
     */
    int
    nullop()
    {
    
            return (0);
    }
    
    #include <sys/conf.h>
    
    /*
     * Unsupported devswitch functions (e.g. for writing to read-only device).
     * XXX may belong elsewhere.
     */
    
    int
    noopen(dev, flags, fmt, p)
            dev_t dev;
            int flags;
            int fmt;
            struct proc *p;
    {
    
            return (ENODEV);
    }
    
    int
    noclose(dev, flags, fmt, p)
            dev_t dev;
            int flags;
            int fmt;
            struct proc *p;
    {
   
           return (ENODEV);
   }
   
   int
   noread(dev, uio, ioflag)
           dev_t dev;
           struct uio *uio;
           int ioflag;
   {
   
           return (ENODEV);
   }
   
   int
   nowrite(dev, uio, ioflag)
           dev_t dev;
           struct uio *uio;
           int ioflag;
   {
   
           return (ENODEV);
   }
   
   int
   noioctl(dev, cmd, data, flags, p)
           dev_t dev;
           u_long cmd;
           caddr_t data;
           int flags;
           struct proc *p;
   {
   
           return (ENODEV);
   }
   
   void
   nostop(tp, rw)
           struct tty *tp;
           int rw;
   {
   
   }
   
   int
   noreset(dev)
           dev_t dev;
   {
   
           printf("noreset(0x%x) called\n", dev);
           return (ENODEV);
   }
   
   struct tty *
   nodevtotty(dev)
           dev_t dev;
   {
   
           return (NULL);
   }
   
   int
   nommap(dev, offset, nprot)
           dev_t dev;
           vm_offset_t offset;
           int nprot;
   {
   
           /* Don't return ENODEV.  That would allow mapping address ENODEV! */
           return (-1);
   }
   
   int
   nodump(dev)
           dev_t dev;
   {
   
           return (ENODEV);
   }
   
   /*
    * Null devswitch functions (for when the operation always succeeds).
    * XXX may belong elsewhere.
    * XXX not all are here (e.g., seltrue() isn't).
    */
   
   /*
    * XXX this is probably bogus.  Any device that uses it isn't checking the
    * minor number.
    */
   int
   nullopen(dev, flags, fmt, p)
           dev_t dev;
           int flags;
           int fmt;
           struct proc *p;
   {
   
           return (0);
   }
   
   int
   nullclose(dev, flags, fmt, p)
           dev_t dev;
           int flags;
           int fmt;
           struct proc *p;
   {
   
           return (0);
   }

Cache object: 26d0dc29902426bc91ed9824343fc453