dtrace_sysctl.c revision 269520 
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: stable/10/sys/cddl/dev/dtrace/dtrace_sysctl.c 269520 2014-08-04 15:36:22Z markj $
22 *
23 */
24
25SYSCTL_NODE(_debug, OID_AUTO, dtrace, CTLFLAG_RD, 0, "DTrace debug parameters");
26
27int	dtrace_debug = 0;
28TUNABLE_INT("debug.dtrace.debug", &dtrace_debug);
29SYSCTL_INT(_debug_dtrace, OID_AUTO, debug, CTLFLAG_RW, &dtrace_debug, 0, "");
30
31/* Report registered DTrace providers. */
32static int
33sysctl_dtrace_providers(SYSCTL_HANDLER_ARGS)
34{
35	char	*p_name	= NULL;
36	dtrace_provider_t
37		*prov	= dtrace_provider;
38	int	error	= 0;
39	size_t	len	= 0;
40
41	mutex_enter(&dtrace_provider_lock);
42	mutex_enter(&dtrace_lock);
43
44	/* Compute the length of the space-separated provider name string. */
45	while (prov != NULL) {
46		len += strlen(prov->dtpv_name) + 1;
47		prov = prov->dtpv_next;
48	}
49
50	if ((p_name = kmem_alloc(len, KM_SLEEP)) == NULL)
51		error = ENOMEM;
52	else {
53		/* Start with an empty string. */
54		*p_name = '\0';
55
56		/* Point to the first provider again. */
57		prov = dtrace_provider;
58
59		/* Loop through the providers, appending the names. */
60		while (prov != NULL) {
61			if (prov != dtrace_provider)
62				(void) strlcat(p_name, " ", len);
63
64			(void) strlcat(p_name, prov->dtpv_name, len);
65
66			prov = prov->dtpv_next;
67		}
68	}
69
70	mutex_exit(&dtrace_lock);
71	mutex_exit(&dtrace_provider_lock);
72
73	if (p_name != NULL) {
74		error = sysctl_handle_string(oidp, p_name, len, req);
75
76		kmem_free(p_name, 0);
77	}
78
79	return (error);
80}
81
82SYSCTL_PROC(_debug_dtrace, OID_AUTO, providers, CTLTYPE_STRING | CTLFLAG_RD,
83    0, 0, sysctl_dtrace_providers, "A", "available DTrace providers");
84
85SYSCTL_NODE(_kern, OID_AUTO, dtrace, CTLFLAG_RD, 0, "DTrace parameters");
86
87SYSCTL_LONG(_kern_dtrace, OID_AUTO, dof_maxsize, CTLFLAG_RW,
88    &dtrace_dof_maxsize, 0, "largest allowed DOF table");
89
90SYSCTL_LONG(_kern_dtrace, OID_AUTO, helper_actions_max, CTLFLAG_RW,
91    &dtrace_helper_actions_max, 0, "maximum number of allowed helper actions");
92
93SYSCTL_INT(_kern_dtrace, OID_AUTO, memstr_max, CTLFLAG_RW, &dtrace_memstr_max,
94    0, "largest allowed argument to memstr(), 0 indicates no limit");
95