d3ce832719
When I changed kern_conf.c three months ago I made device unit numbers equal to (unneeded) device minor numbers. We used to require bitshifting, because there were eight bits in the middle that were reserved for a device major number. Not very long after I turned dev2unit(), minor(), unit2minor() and minor2unit() into macro's. The unit2minor() and minor2unit() macro's were no-ops. We'd better not remove these four macro's from the kernel, because there is a lot of (external) code that may still depend on them. For now it's harmless to remove all invocations of unit2minor() and minor2unit(). Reviewed by: kib
62 lines
2.1 KiB
C
62 lines
2.1 KiB
C
/*-
|
|
* Copyright (C) 2006 John Birrell <jb@freebsd.org>.
|
|
* 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(s), this list of conditions and the following disclaimer as
|
|
* the first lines of this file unmodified other than the possible
|
|
* addition of one or more copyright notices.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice(s), this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``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 COPYRIGHT HOLDER(S) 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.
|
|
*
|
|
* $FreeBSD$
|
|
*
|
|
*/
|
|
|
|
static void
|
|
dtrace_clone(void *arg, struct ucred *cred, char *name, int namelen, struct cdev **dev)
|
|
{
|
|
int u = -1;
|
|
size_t len;
|
|
|
|
if (*dev != NULL)
|
|
return;
|
|
|
|
len = strlen(name);
|
|
|
|
if (len != 6 && len != 13)
|
|
return;
|
|
|
|
if (bcmp(name,"dtrace",6) != 0)
|
|
return;
|
|
|
|
if (len == 13 && bcmp(name,"dtrace/dtrace",13) != 0)
|
|
return;
|
|
|
|
/* Clone the device to the new minor number. */
|
|
if (clone_create(&dtrace_clones, &dtrace_cdevsw, &u, dev, 0) != 0)
|
|
/* Create the /dev/dtrace/dtraceNN entry. */
|
|
*dev = make_dev_cred(&dtrace_cdevsw, u, cred,
|
|
UID_ROOT, GID_WHEEL, 0600, "dtrace/dtrace%d", u);
|
|
if (*dev != NULL) {
|
|
dev_ref(*dev);
|
|
(*dev)->si_flags |= SI_CHEAPCLONE;
|
|
}
|
|
}
|