1/*- 2 * Copyright (C) 2006 John Birrell <jb@freebsd.org>. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice(s), this list of conditions and the following disclaimer as 10 * the first lines of this file unmodified other than the possible 11 * addition of one or more copyright notices. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice(s), this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY 17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 19 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY 20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 23 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH 26 * DAMAGE. 27 * 28 * $FreeBSD$ 29 * 30 */ 31 32static void 33dtrace_clone(void *arg, struct ucred *cred, char *name, int namelen, struct cdev **dev) 34{ 35 int u = -1; 36 size_t len; 37 38 if (*dev != NULL) 39 return; 40 41 len = strlen(name); 42 43 if (len != 6 && len != 13) 44 return; 45 46 if (bcmp(name,"dtrace",6) != 0) 47 return; 48 49 if (len == 13 && bcmp(name,"dtrace/dtrace",13) != 0) 50 return; 51 52 /* Clone the device to the new minor number. */ 53 if (clone_create(&dtrace_clones, &dtrace_cdevsw, &u, dev, 0) != 0) 54 /* Create the /dev/dtrace/dtraceNN entry. */ 55 *dev = make_dev_credf(MAKEDEV_REF, &dtrace_cdevsw, u, cred, 56 UID_ROOT, GID_WHEEL, 0600, "dtrace/dtrace%d", u); 57} 58