1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 * 21 * $FreeBSD$ 22 * 23 */ 24 25 SYSCTL_NODE(_debug, OID_AUTO, dtrace, CTLFLAG_RD, 0, "DTrace debug parameters"); 26 27 int dtrace_debug = 0; 28 SYSCTL_INT(_debug_dtrace, OID_AUTO, debug, CTLFLAG_RWTUN, &dtrace_debug, 0, ""); 29 30 /* Report registered DTrace providers. */ 31 static int 32 sysctl_dtrace_providers(SYSCTL_HANDLER_ARGS) 33 { 34 char *p_name = NULL; 35 dtrace_provider_t 36 *prov = dtrace_provider; 37 int error = 0; 38 size_t len = 0; 39 40 mutex_enter(&dtrace_provider_lock); 41 mutex_enter(&dtrace_lock); 42 43 /* Compute the length of the space-separated provider name string. */ 44 while (prov != NULL) { 45 len += strlen(prov->dtpv_name) + 1; 46 prov = prov->dtpv_next; 47 } 48 49 if ((p_name = kmem_alloc(len, KM_SLEEP)) == NULL) 50 error = ENOMEM; 51 else { 52 /* Start with an empty string. */ 53 *p_name = '\0'; 54 55 /* Point to the first provider again. */ 56 prov = dtrace_provider; 57 58 /* Loop through the providers, appending the names. */ 59 while (prov != NULL) { 60 if (prov != dtrace_provider) 61 (void) strlcat(p_name, " ", len); 62 63 (void) strlcat(p_name, prov->dtpv_name, len); 64 65 prov = prov->dtpv_next; 66 } 67 } 68 69 mutex_exit(&dtrace_lock); 70 mutex_exit(&dtrace_provider_lock); 71 72 if (p_name != NULL) { 73 error = sysctl_handle_string(oidp, p_name, len, req); 74 75 kmem_free(p_name, 0); 76 } 77 78 return (error); 79 } 80 81 SYSCTL_PROC(_debug_dtrace, OID_AUTO, providers, CTLTYPE_STRING | CTLFLAG_RD, 82 0, 0, sysctl_dtrace_providers, "A", "available DTrace providers"); 83 84 SYSCTL_NODE(_kern, OID_AUTO, dtrace, CTLFLAG_RD, 0, "DTrace parameters"); 85 86 SYSCTL_INT(_kern_dtrace, OID_AUTO, memstr_max, CTLFLAG_RW, &dtrace_memstr_max, 87 0, "largest allowed argument to memstr(), 0 indicates no limit"); 88 89 SYSCTL_QUAD(_kern_dtrace, OID_AUTO, dof_maxsize, CTLFLAG_RW, 90 &dtrace_dof_maxsize, 0, "largest allowed DOF table"); 91 92 SYSCTL_QUAD(_kern_dtrace, OID_AUTO, helper_actions_max, CTLFLAG_RW, 93 &dtrace_helper_actions_max, 0, "maximum number of allowed helper actions"); 94