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