Commit | Line | Data |
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a58c490f | 1 | /* |
ab5be9fa | 2 | * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
a58c490f | 3 | * |
ab5be9fa | 4 | * SPDX-License-Identifier: LGPL-2.1-only |
a58c490f | 5 | * |
a58c490f JG |
6 | */ |
7 | ||
8 | #ifndef LTTNG_TRIGGER_INTERNAL_H | |
9 | #define LTTNG_TRIGGER_INTERNAL_H | |
10 | ||
3da864a9 | 11 | #include <common/credentials.h> |
a02903c0 | 12 | #include <common/dynamic-array.h> |
a58c490f | 13 | #include <common/macros.h> |
3da864a9 | 14 | #include <common/optional.h> |
9c374932 JR |
15 | #include <lttng/trigger/trigger.h> |
16 | #include <pthread.h> | |
a58c490f | 17 | #include <stdbool.h> |
9c374932 | 18 | #include <stdint.h> |
72756a3f | 19 | #include <sys/types.h> |
f01d28b4 | 20 | #include <urcu/ref.h> |
a58c490f | 21 | |
c0a66c84 JG |
22 | struct lttng_payload; |
23 | struct lttng_payload_view; | |
24 | ||
a58c490f | 25 | struct lttng_trigger { |
f01d28b4 JR |
26 | /* Reference counting is only exposed to internal users. */ |
27 | struct urcu_ref ref; | |
28 | ||
a58c490f JG |
29 | struct lttng_condition *condition; |
30 | struct lttng_action *action; | |
242388e4 | 31 | char *name; |
64eafdf6 JR |
32 | /* For now only the uid portion of the credentials is used. */ |
33 | struct lttng_credentials creds; | |
e6887944 JR |
34 | /* |
35 | * Internal use only. | |
36 | * The unique token passed to the tracer to identify an event-rule | |
37 | * notification. | |
38 | */ | |
39 | LTTNG_OPTIONAL(uint64_t) tracer_token; | |
9c374932 JR |
40 | |
41 | /* | |
42 | * Is the trigger registered? | |
43 | * | |
44 | * This is necessary since a reference holder might be interested in the | |
45 | * overall state of the trigger from the point of view of its owner. | |
46 | * | |
47 | * The main user is the action executor since we want to prevent the | |
48 | * execution of actions related to a trigger that is unregistered. | |
49 | * | |
50 | * Not considered for `is_equal`. | |
51 | */ | |
52 | bool registered; | |
53 | ||
54 | /* | |
55 | * The lock is used to protect against concurrent trigger execution and | |
56 | * trigger removal. | |
57 | */ | |
58 | pthread_mutex_t lock; | |
a58c490f JG |
59 | }; |
60 | ||
a02903c0 JR |
61 | struct lttng_triggers { |
62 | struct lttng_dynamic_pointer_array array; | |
63 | }; | |
64 | ||
a58c490f | 65 | struct lttng_trigger_comm { |
64eafdf6 JR |
66 | /* |
67 | * Credentials, only the uid portion is used for now. | |
68 | * Used as an override when desired by the root user. | |
69 | */ | |
70 | uint64_t uid; | |
242388e4 JR |
71 | /* |
72 | * Length of the variable length payload (name, condition, and | |
73 | * an action). | |
74 | */ | |
75 | uint32_t length; | |
76 | /* Includes '\0' terminator. */ | |
77 | uint32_t name_length; | |
78 | /* A null-terminated name, a condition, and an action follow. */ | |
a58c490f JG |
79 | char payload[]; |
80 | } LTTNG_PACKED; | |
81 | ||
a02903c0 JR |
82 | struct lttng_triggers_comm { |
83 | uint32_t count; | |
84 | uint32_t length; | |
85 | /* Count * lttng_trigger_comm structure */ | |
86 | char payload[]; | |
87 | }; | |
88 | ||
a58c490f | 89 | LTTNG_HIDDEN |
c0a66c84 | 90 | ssize_t lttng_trigger_create_from_payload(struct lttng_payload_view *view, |
a58c490f JG |
91 | struct lttng_trigger **trigger); |
92 | ||
93 | LTTNG_HIDDEN | |
a02903c0 | 94 | int lttng_trigger_serialize(const struct lttng_trigger *trigger, |
c0a66c84 | 95 | struct lttng_payload *payload); |
a58c490f JG |
96 | |
97 | LTTNG_HIDDEN | |
b61776fb | 98 | bool lttng_trigger_validate(const struct lttng_trigger *trigger); |
a58c490f | 99 | |
242388e4 JR |
100 | LTTNG_HIDDEN |
101 | int lttng_trigger_assign_name( | |
102 | struct lttng_trigger *dst, const struct lttng_trigger *src); | |
103 | ||
e6887944 JR |
104 | LTTNG_HIDDEN |
105 | void lttng_trigger_set_tracer_token( | |
106 | struct lttng_trigger *trigger, uint64_t token); | |
107 | ||
108 | LTTNG_HIDDEN | |
109 | uint64_t lttng_trigger_get_tracer_token(const struct lttng_trigger *trigger); | |
110 | ||
242388e4 JR |
111 | LTTNG_HIDDEN |
112 | int lttng_trigger_generate_name(struct lttng_trigger *trigger, | |
113 | uint64_t unique_id); | |
114 | ||
85c06c44 JR |
115 | LTTNG_HIDDEN |
116 | bool lttng_trigger_is_equal( | |
117 | const struct lttng_trigger *a, const struct lttng_trigger *b); | |
118 | ||
f01d28b4 JR |
119 | LTTNG_HIDDEN |
120 | void lttng_trigger_get(struct lttng_trigger *trigger); | |
121 | ||
122 | LTTNG_HIDDEN | |
123 | void lttng_trigger_put(struct lttng_trigger *trigger); | |
124 | ||
a02903c0 JR |
125 | /* |
126 | * Allocate a new set of triggers. | |
127 | * The returned object must be freed via lttng_triggers_destroy. | |
128 | */ | |
129 | LTTNG_HIDDEN | |
130 | struct lttng_triggers *lttng_triggers_create(void); | |
131 | ||
132 | /* | |
133 | * Return the a pointer to a mutable element at index "index" of an | |
134 | * lttng_triggers set. | |
135 | * | |
136 | * This differs from the public `lttng_triggers_get_at_index` in that | |
137 | * the returned pointer to a mutable trigger. | |
138 | * | |
139 | * The ownership of the trigger set element is NOT transfered. | |
140 | * The returned object can NOT be freed via lttng_trigger_destroy. | |
141 | */ | |
142 | LTTNG_HIDDEN | |
143 | struct lttng_trigger *lttng_triggers_borrow_mutable_at_index( | |
144 | const struct lttng_triggers *triggers, unsigned int index); | |
145 | ||
146 | /* | |
147 | * Add a trigger to the triggers set. | |
148 | * | |
149 | * A reference to the added trigger is acquired on behalf of the trigger set | |
150 | * on success. | |
151 | */ | |
152 | LTTNG_HIDDEN | |
153 | int lttng_triggers_add( | |
154 | struct lttng_triggers *triggers, struct lttng_trigger *trigger); | |
155 | ||
156 | /* | |
157 | * Serialize a trigger set to an lttng_payload object. | |
158 | * Return LTTNG_OK on success, negative lttng error code on error. | |
159 | */ | |
160 | LTTNG_HIDDEN | |
161 | int lttng_triggers_serialize(const struct lttng_triggers *triggers, | |
162 | struct lttng_payload *payload); | |
163 | ||
164 | LTTNG_HIDDEN | |
165 | ssize_t lttng_triggers_create_from_payload(struct lttng_payload_view *view, | |
166 | struct lttng_triggers **triggers); | |
167 | ||
3da864a9 JR |
168 | LTTNG_HIDDEN |
169 | const struct lttng_credentials *lttng_trigger_get_credentials( | |
170 | const struct lttng_trigger *trigger); | |
171 | ||
172 | LTTNG_HIDDEN | |
64eafdf6 | 173 | void lttng_trigger_set_credentials(struct lttng_trigger *trigger, |
3da864a9 JR |
174 | const struct lttng_credentials *creds); |
175 | ||
91c96f62 JR |
176 | /* |
177 | * Return the type of any underlying domain restriction. If no particular | |
178 | * requirement is present, returns LTTNG_DOMAIN_NONE. | |
179 | */ | |
180 | LTTNG_HIDDEN | |
181 | enum lttng_domain_type lttng_trigger_get_underlying_domain_type_restriction( | |
182 | const struct lttng_trigger *trigger); | |
183 | ||
58daac01 JR |
184 | /* |
185 | * Generate any bytecode related to the trigger. | |
186 | * On success LTTNG_OK. On error, returns lttng_error code. | |
187 | */ | |
188 | LTTNG_HIDDEN | |
189 | enum lttng_error_code lttng_trigger_generate_bytecode( | |
190 | struct lttng_trigger *trigger, | |
191 | const struct lttng_credentials *creds); | |
192 | ||
b61776fb SM |
193 | LTTNG_HIDDEN |
194 | struct lttng_trigger *lttng_trigger_copy(const struct lttng_trigger *trigger); | |
195 | ||
c738df17 FD |
196 | /* |
197 | * A given trigger needs a tracer notifier if | |
198 | * it has an event-rule condition, | |
199 | * AND | |
200 | * it has one or more sessiond-execution action. | |
201 | */ | |
202 | LTTNG_HIDDEN | |
203 | bool lttng_trigger_needs_tracer_notifier(const struct lttng_trigger *trigger); | |
204 | ||
9c374932 JR |
205 | LTTNG_HIDDEN |
206 | void lttng_trigger_set_as_registered(struct lttng_trigger *trigger); | |
207 | ||
208 | LTTNG_HIDDEN | |
209 | void lttng_trigger_set_as_unregistered(struct lttng_trigger *trigger); | |
210 | ||
211 | /* | |
212 | * The trigger must be locked before calling lttng_trigger_is_registered. | |
213 | * | |
214 | * The lock is necessary since a trigger can be unregistered at any time. | |
215 | * | |
216 | * Manipulations requiring that the trigger be registered must always acquire | |
217 | * the trigger lock for the duration of the manipulation using | |
218 | * `lttng_trigger_lock` and `lttng_trigger_unlock`. | |
219 | */ | |
220 | LTTNG_HIDDEN | |
221 | bool lttng_trigger_is_registered(struct lttng_trigger *trigger); | |
222 | ||
223 | LTTNG_HIDDEN | |
224 | void lttng_trigger_lock(struct lttng_trigger *trigger); | |
225 | ||
226 | LTTNG_HIDDEN | |
227 | void lttng_trigger_unlock(struct lttng_trigger *trigger); | |
228 | ||
a58c490f | 229 | #endif /* LTTNG_TRIGGER_INTERNAL_H */ |