2 * Copyright (c) 1982, 1986, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
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6 * modification, are permitted provided that the following conditions
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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.
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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
33 * @(#)subr_xxx.c 8.1 (Berkeley) 6/10/93
34 * $FreeBSD: src/sys/kern/subr_xxx.c,v 1.15.2.1 2001/02/26 04:23:16 jlemon Exp $
35 * $DragonFly: src/sys/kern/Attic/subr_xxx.c,v 1.4 2004/05/19 22:52:58 dillon Exp $
39 * Miscellaneous trivial functions.
41 #include <sys/param.h>
42 #include <sys/systm.h>
46 * Return error for operation not supported
47 * on a specific object or file type.
56 * Return error for an inval operation
57 * on a specific object or file type.
66 * Generic null operation, always returns success.
77 * Unsupported devswitch functions (e.g. for writing to read-only device).
78 * XXX may belong elsewhere.
85 return (0); /* allow the clone */
89 noopen(dev_t dev, int flags, int fmt, struct thread *td)
95 noclose(dev_t dev, int flags, int fmt, struct thread *td)
101 noread(dev_t dev, struct uio *uio, int ioflag)
107 nowrite(dev_t dev, struct uio *uio, int ioflag)
113 noioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct thread *td)
119 nokqfilter(dev_t dev, struct knote *kn)
125 nommap(dev_t dev, vm_offset_t offset, int nprot)
127 /* Don't return ENODEV. That would allow mapping address ENODEV! */
132 nopoll(dev_t dev, int events, d_thread_t *td)
138 nostrategy(struct buf *bp)
140 bp->b_flags |= B_ERROR;
141 bp->b_error = EOPNOTSUPP;
152 nodump(dev_t dev, u_int count, u_int blkno, u_int secsize)
158 * Null devswitch functions (for when the operation always succeeds).
159 * XXX may belong elsewhere.
160 * XXX not all are here (e.g., seltrue() isn't).
164 * XXX this is probably bogus. Any device that uses it isn't checking the
168 nullopen(dev_t dev, int flags, int fmt, struct thread *td)
174 nullclose(dev_t dev, int flags, int fmt, struct thread *td)