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eb5c4f4e JG |
1 | /* |
2 | * event.c | |
3 | * | |
4 | * Linux Trace Toolkit Control Library | |
5 | * | |
6 | * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
7 | * | |
8 | * This library is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU Lesser General Public License, version 2.1 only, | |
10 | * as published by the Free Software Foundation. | |
11 | * | |
12 | * This library is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public License | |
18 | * along with this library; if not, write to the Free Software Foundation, | |
19 | * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #define _LGPL_SOURCE | |
ef0e06bc | 23 | #include <assert.h> |
eb5c4f4e | 24 | #include <stddef.h> |
ef0e06bc JG |
25 | |
26 | #include <common/error.h> | |
eb5c4f4e | 27 | #include <common/sessiond-comm/sessiond-comm.h> |
ef0e06bc JG |
28 | #include <lttng/event-internal.h> |
29 | #include <lttng/event.h> | |
30 | #include <lttng/lttng-error.h> | |
31 | #include <lttng/userspace-probe-internal.h> | |
32 | ||
33 | struct lttng_event *lttng_event_create(void) | |
34 | { | |
35 | struct lttng_event *event; | |
36 | struct lttng_event_extended *event_extended; | |
37 | ||
38 | event = zmalloc(sizeof(*event)); | |
39 | if (!event) { | |
40 | PERROR("Error allocating event structure"); | |
41 | goto end; | |
42 | } | |
43 | ||
44 | event_extended = zmalloc(sizeof(*event_extended)); | |
45 | if (!event_extended) { | |
46 | PERROR("Error allocating event extended structure"); | |
47 | goto error; | |
48 | } | |
49 | event->extended.ptr = event_extended; | |
50 | end: | |
51 | return event; | |
52 | error: | |
53 | free(event); | |
54 | goto end; | |
55 | } | |
56 | ||
57 | void lttng_event_destroy(struct lttng_event *event) | |
58 | { | |
59 | struct lttng_event_extended *event_extended; | |
60 | ||
61 | if (!event) { | |
62 | return; | |
63 | } | |
64 | ||
65 | event_extended = (struct lttng_event_extended *) event->extended.ptr; | |
66 | ||
67 | if (event_extended) { | |
68 | if (event_extended->probe_location) { | |
69 | lttng_userspace_probe_location_destroy( | |
70 | event_extended->probe_location); | |
71 | } | |
72 | free(event_extended); | |
73 | } | |
74 | free(event); | |
75 | } | |
eb5c4f4e JG |
76 | |
77 | int lttng_event_get_filter_expression(struct lttng_event *event, | |
78 | const char **filter_expression) | |
79 | { | |
80 | int ret = 0; | |
81 | struct lttcomm_event_extended_header *ext_header; | |
82 | ||
83 | if (!event || !filter_expression) { | |
84 | ret = -LTTNG_ERR_INVALID; | |
85 | goto end; | |
86 | } | |
87 | ||
88 | ext_header = event->extended.ptr; | |
89 | ||
90 | if (!ext_header) { | |
91 | /* | |
92 | * This can happen since the lttng_event structure is | |
93 | * used for other tasks where this pointer is never set. | |
94 | */ | |
95 | *filter_expression = NULL; | |
96 | goto end; | |
97 | } | |
98 | ||
99 | if (ext_header->filter_len) { | |
100 | *filter_expression = ((const char *) (ext_header)) + | |
101 | sizeof(*ext_header); | |
102 | } else { | |
103 | *filter_expression = NULL; | |
104 | } | |
105 | ||
106 | end: | |
107 | return ret; | |
108 | } | |
109 | ||
110 | int lttng_event_get_exclusion_name_count(struct lttng_event *event) | |
111 | { | |
112 | int ret; | |
113 | struct lttcomm_event_extended_header *ext_header; | |
114 | ||
115 | if (!event) { | |
116 | ret = -LTTNG_ERR_INVALID; | |
117 | goto end; | |
118 | } | |
119 | ||
120 | ext_header = event->extended.ptr; | |
121 | if (!ext_header) { | |
122 | /* | |
123 | * This can happen since the lttng_event structure is | |
124 | * used for other tasks where this pointer is never set. | |
125 | */ | |
126 | ret = 0; | |
127 | goto end; | |
128 | } | |
129 | ||
130 | if (ext_header->nb_exclusions > INT_MAX) { | |
131 | ret = -LTTNG_ERR_OVERFLOW; | |
132 | goto end; | |
133 | } | |
134 | ret = (int) ext_header->nb_exclusions; | |
135 | end: | |
136 | return ret; | |
137 | } | |
138 | ||
139 | int lttng_event_get_exclusion_name(struct lttng_event *event, | |
140 | size_t index, const char **exclusion_name) | |
141 | { | |
142 | int ret = 0; | |
143 | struct lttcomm_event_extended_header *ext_header; | |
144 | void *at; | |
145 | ||
146 | if (!event || !exclusion_name) { | |
147 | ret = -LTTNG_ERR_INVALID; | |
148 | goto end; | |
149 | } | |
150 | ||
151 | ext_header = event->extended.ptr; | |
152 | if (!ext_header) { | |
153 | ret = -LTTNG_ERR_INVALID; | |
154 | goto end; | |
155 | } | |
156 | ||
157 | if (index >= ext_header->nb_exclusions) { | |
158 | ret = -LTTNG_ERR_INVALID; | |
159 | goto end; | |
160 | } | |
161 | ||
162 | at = (void *) ext_header + sizeof(*ext_header); | |
163 | at += ext_header->filter_len; | |
164 | at += index * LTTNG_SYMBOL_NAME_LEN; | |
165 | *exclusion_name = at; | |
166 | ||
167 | end: | |
168 | return ret; | |
169 | } | |
ef0e06bc JG |
170 | |
171 | struct lttng_userspace_probe_location * | |
172 | lttng_event_get_userspace_probe_location(struct lttng_event *event) | |
173 | { | |
174 | struct lttng_userspace_probe_location *probe_location = NULL; | |
175 | struct lttng_event_extended *event_extended; | |
176 | ||
177 | if (!event) { | |
178 | goto end; | |
179 | } | |
180 | ||
181 | event_extended = (struct lttng_event_extended *) event->extended.ptr; | |
182 | if (!event_extended) { | |
183 | goto end; | |
184 | } | |
185 | probe_location = event_extended->probe_location; | |
186 | end: | |
187 | return probe_location; | |
188 | } | |
189 | ||
190 | int lttng_event_set_userspace_probe_location(struct lttng_event *event, | |
191 | struct lttng_userspace_probe_location *probe_location) | |
192 | { | |
193 | int ret = 0; | |
194 | struct lttng_event_extended *event_extended; | |
195 | ||
196 | if (!event || !probe_location) { | |
197 | ret = -LTTNG_ERR_INVALID; | |
198 | goto end; | |
199 | } | |
200 | ||
201 | event_extended = (struct lttng_event_extended *) event->extended.ptr; | |
202 | assert(event_extended); | |
203 | if (event_extended->probe_location) { | |
204 | lttng_userspace_probe_location_destroy( | |
205 | event_extended->probe_location); | |
206 | } | |
207 | event_extended->probe_location = probe_location; | |
208 | end: | |
209 | return ret; | |
210 | } |