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 /* Report registered DTrace providers. */ 26 static int 27 sysctl_dtrace_providers(SYSCTL_HANDLER_ARGS) 28 { 29 char *p_name = NULL; 30 dtrace_provider_t 31 *prov = dtrace_provider; 32 int error = 0; 33 size_t len = 0; 34 35 mutex_enter(&dtrace_provider_lock); 36 mutex_enter(&dtrace_lock); 37 38 /* Compute the length of the space-separated provider name string. */ 39 while (prov != NULL) { 40 len += strlen(prov->dtpv_name) + 1; 41 prov = prov->dtpv_next; 42 } 43 44 if ((p_name = kmem_alloc(len, KM_SLEEP)) == NULL) 45 error = ENOMEM; 46 else { 47 /* Start with an empty string. */ 48 *p_name = '\0'; 49 50 /* Point to the first provider again. */ 51 prov = dtrace_provider; 52 53 /* Loop through the providers, appending the names. */ 54 while (prov != NULL) { 55 if (prov != dtrace_provider) 56 (void) strlcat(p_name, " ", len); 57 58 (void) strlcat(p_name, prov->dtpv_name, len); 59 60 prov = prov->dtpv_next; 61 } 62 } 63 64 mutex_exit(&dtrace_lock); 65 mutex_exit(&dtrace_provider_lock); 66 67 if (p_name != NULL) { 68 error = sysctl_handle_string(oidp, p_name, len, req); 69 70 kmem_free(p_name, 0); 71 } 72 73 return (error); 74 } 75 76 SYSCTL_NODE(_debug, OID_AUTO, dtrace, CTLFLAG_RD, 0, "DTrace debug parameters"); 77 78 SYSCTL_PROC(_debug_dtrace, OID_AUTO, providers, CTLTYPE_STRING | CTLFLAG_RD, 79 0, 0, sysctl_dtrace_providers, "A", "available DTrace providers"); 80 81 SYSCTL_NODE(_kern, OID_AUTO, dtrace, CTLFLAG_RD, 0, "DTrace parameters"); 82 83 SYSCTL_INT(_kern_dtrace, OID_AUTO, err_verbose, CTLFLAG_RW, 84 &dtrace_err_verbose, 0, 85 "print DIF and DOF validation errors to the message buffer"); 86 87 SYSCTL_INT(_kern_dtrace, OID_AUTO, memstr_max, CTLFLAG_RW, &dtrace_memstr_max, 88 0, "largest allowed argument to memstr(), 0 indicates no limit"); 89 90 SYSCTL_QUAD(_kern_dtrace, OID_AUTO, dof_maxsize, CTLFLAG_RW, 91 &dtrace_dof_maxsize, 0, "largest allowed DOF table"); 92 93 SYSCTL_QUAD(_kern_dtrace, OID_AUTO, helper_actions_max, CTLFLAG_RW, 94 &dtrace_helper_actions_max, 0, "maximum number of allowed helper actions"); 95