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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 1.3 2003/06/23 17:55:41 dillon Exp $
39 * Miscellaneous trivial functions.
41 #include <sys/param.h>
42 #include <sys/systm.h>
45 * Return error for operation not supported
46 * on a specific object or file type.
56 * Return error for an inval operation
57 * on a specific object or file type.
67 * Generic null operation, always returns success.
79 * Unsupported devswitch functions (e.g. for writing to read-only device).
80 * XXX may belong elsewhere.
84 noopen(dev, flags, fmt, td)
95 noclose(dev, flags, fmt, td)
106 noread(dev, uio, ioflag)
116 nowrite(dev, uio, ioflag)
126 noioctl(dev, cmd, data, flags, td)
147 nommap(dev, offset, nprot)
153 /* Don't return ENODEV. That would allow mapping address ENODEV! */
166 * Null devswitch functions (for when the operation always succeeds).
167 * XXX may belong elsewhere.
168 * XXX not all are here (e.g., seltrue() isn't).
172 * XXX this is probably bogus. Any device that uses it isn't checking the
176 nullopen(dev, flags, fmt, td)
187 nullclose(dev, flags, fmt, td)