1 /* $NetBSD: dtrace_modevent.c,v 1.6 2018/05/28 21:05:03 chs Exp $ */ 2 3 /* 4 * CDDL HEADER START 5 * 6 * The contents of this file are subject to the terms of the 7 * Common Development and Distribution License (the "License"). 8 * You may not use this file except in compliance with the License. 9 * 10 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 11 * or http://www.opensolaris.org/os/licensing. 12 * See the License for the specific language governing permissions 13 * and limitations under the License. 14 * 15 * When distributing Covered Code, include this CDDL HEADER in each 16 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 17 * If applicable, add the following below this CDDL HEADER, with the 18 * fields enclosed by brackets "[]" replaced with your own identifying 19 * information: Portions Copyright [yyyy] [name of copyright owner] 20 * 21 * CDDL HEADER END 22 * 23 * $FreeBSD: head/sys/cddl/dev/dtrace/dtrace_load.c 309069 2016-11-23 22:50:20Z gnn $ 24 * 25 */ 26 27 /* ARGSUSED */ 28 static int 29 dtrace_modcmd(modcmd_t cmd, void *data) 30 { 31 int bmajor = -1, cmajor = -1; 32 int error; 33 34 switch (cmd) { 35 case MODULE_CMD_INIT: 36 dtrace_load(NULL); 37 error = devsw_attach("dtrace", NULL, &bmajor, 38 &dtrace_cdevsw, &cmajor); 39 if (error != 0) 40 if (dtrace_unload() != 0) 41 panic("failed to unload dtrace"); 42 return error; 43 44 case MODULE_CMD_FINI: 45 error = devsw_detach(NULL, &dtrace_cdevsw); 46 if (error != 0) 47 return error; 48 49 error = dtrace_unload(); 50 if (error != 0) { 51 if (devsw_attach("dtrace", NULL, &bmajor, 52 &dtrace_cdevsw, &cmajor) != 0) 53 panic("failed to reattach dtrace_devsw"); 54 } 55 return error; 56 57 case MODULE_CMD_AUTOUNLOAD: 58 return EBUSY; 59 default: 60 return ENOTTY; 61 } 62 } 63