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6ba31891 FD |
1 | /* |
2 | * Copyright (C) 2020 Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
3 | * | |
4 | * SPDX-License-Identifier: MIT | |
5 | * | |
6 | */ | |
7 | ||
8 | #include <getopt.h> | |
9 | #include <stdbool.h> | |
10 | #include <stddef.h> | |
11 | #include <stdio.h> | |
12 | #include <stdlib.h> | |
13 | #include <string.h> | |
14 | #include <sys/time.h> | |
15 | #include <time.h> | |
16 | ||
670a26e4 | 17 | #include <lttng/condition/event-rule-matches.h> |
6ba31891 FD |
18 | #include <lttng/lttng.h> |
19 | ||
20 | #include "utils.h" | |
21 | ||
22 | static struct option long_options[] = | |
23 | { | |
24 | /* These options set a flag. */ | |
7d59def2 | 25 | {"trigger", required_argument, 0, 't'}, |
6ba31891 | 26 | {"sync-after-notif-register", required_argument, 0, 'a'}, |
6ffce1f5 JR |
27 | /* Default alue for count is 1 */ |
28 | {"count", required_argument, 0, 'b'}, | |
29 | /* | |
30 | * When end-trigger is present the reception loop is exited only when a | |
31 | * notification matching the end trigger is received. | |
32 | * Otherwise the loop is exited when the count of notification received | |
33 | * for `trigger` math the `count` argument. | |
34 | */ | |
35 | {"end-trigger", required_argument, 0, 'c'}, | |
6ba31891 FD |
36 | {0, 0, 0, 0} |
37 | }; | |
38 | ||
702f26c8 JR |
39 | static bool action_list_contains_notify( |
40 | const struct lttng_action *action_list) | |
6ba31891 FD |
41 | { |
42 | unsigned int i, count; | |
43 | enum lttng_action_status status = | |
702f26c8 | 44 | lttng_action_list_get_count(action_list, &count); |
6ba31891 FD |
45 | |
46 | if (status != LTTNG_ACTION_STATUS_OK) { | |
702f26c8 | 47 | printf("Failed to get action count from action list\n"); |
6ba31891 FD |
48 | exit(1); |
49 | } | |
50 | ||
51 | for (i = 0; i < count; i++) { | |
52 | const struct lttng_action *action = | |
702f26c8 JR |
53 | lttng_action_list_get_at_index( |
54 | action_list, i); | |
6ba31891 FD |
55 | const enum lttng_action_type action_type = |
56 | lttng_action_get_type(action); | |
57 | ||
58 | if (action_type == LTTNG_ACTION_TYPE_NOTIFY) { | |
59 | return true; | |
60 | } | |
61 | } | |
62 | return false; | |
63 | } | |
64 | ||
0efb2ad7 | 65 | /* Only expects named triggers. */ |
7d59def2 | 66 | static bool is_trigger_name(const char *expected_trigger_name, |
6ba31891 FD |
67 | struct lttng_notification *notification) |
68 | { | |
65f64978 JG |
69 | const char *trigger_name = NULL; |
70 | enum lttng_trigger_status trigger_status; | |
71 | const struct lttng_trigger *trigger; | |
72 | bool names_match; | |
6ba31891 | 73 | |
65f64978 JG |
74 | trigger = lttng_notification_get_trigger(notification); |
75 | if (!trigger) { | |
76 | fprintf(stderr, "Failed to get trigger from notification\n"); | |
77 | names_match = false; | |
78 | goto end; | |
6ba31891 | 79 | } |
65f64978 JG |
80 | |
81 | trigger_status = lttng_trigger_get_name(trigger, &trigger_name); | |
82 | if (trigger_status != LTTNG_TRIGGER_STATUS_OK) { | |
83 | fprintf(stderr, "Failed to get name from notification's trigger\n"); | |
84 | names_match = false; | |
85 | goto end; | |
6ba31891 FD |
86 | } |
87 | ||
65f64978 | 88 | names_match = strcmp(expected_trigger_name, trigger_name) == 0; |
7d59def2 JR |
89 | if (!names_match) { |
90 | fprintf(stderr, "Got an unexpected trigger name: name = '%s', expected name = '%s'\n", | |
91 | trigger_name, expected_trigger_name); | |
92 | } | |
65f64978 JG |
93 | end: |
94 | return names_match; | |
6ba31891 FD |
95 | } |
96 | ||
97 | int main(int argc, char **argv) | |
98 | { | |
99 | int ret; | |
100 | int option; | |
101 | int option_index; | |
3e68c9e8 JG |
102 | char *expected_trigger_name = NULL; |
103 | char *end_trigger_name = NULL; | |
6ba31891 FD |
104 | struct lttng_triggers *triggers = NULL; |
105 | unsigned int count, i, subcription_count = 0; | |
106 | enum lttng_trigger_status trigger_status; | |
107 | char *after_notif_register_file_path = NULL; | |
108 | struct lttng_notification_channel *notification_channel = NULL; | |
6ffce1f5 | 109 | int expected_notifications = 1, notification_count = 0; |
6ba31891 | 110 | |
6ffce1f5 JR |
111 | while ((option = getopt_long(argc, argv, "a:b:c:t:", long_options, |
112 | &option_index)) != -1) { | |
6ba31891 FD |
113 | switch (option) { |
114 | case 'a': | |
115 | after_notif_register_file_path = strdup(optarg); | |
116 | break; | |
6ffce1f5 JR |
117 | case 'b': |
118 | expected_notifications = atoi(optarg); | |
119 | break; | |
120 | case 'c': | |
121 | end_trigger_name = strdup(optarg); | |
122 | break; | |
6ba31891 FD |
123 | case 't': |
124 | expected_trigger_name = strdup(optarg); | |
125 | break; | |
126 | case '?': | |
127 | /* getopt_long already printed an error message. */ | |
128 | default: | |
129 | ret = -1; | |
130 | goto end; | |
131 | } | |
132 | } | |
133 | ||
134 | if (optind != argc) { | |
135 | ret = -1; | |
136 | goto end; | |
137 | } | |
138 | ||
139 | ||
140 | notification_channel = lttng_notification_channel_create( | |
141 | lttng_session_daemon_notification_endpoint); | |
142 | if (!notification_channel) { | |
143 | fprintf(stderr, "Failed to create notification channel\n"); | |
144 | ret = -1; | |
145 | goto end; | |
146 | } | |
147 | ||
148 | ret = lttng_list_triggers(&triggers); | |
149 | if (ret != LTTNG_OK) { | |
150 | fprintf(stderr, "Failed to list triggers\n"); | |
7d59def2 | 151 | ret = -1; |
6ba31891 FD |
152 | goto end; |
153 | } | |
154 | ||
155 | trigger_status = lttng_triggers_get_count(triggers, &count); | |
156 | if (trigger_status != LTTNG_TRIGGER_STATUS_OK) { | |
157 | fprintf(stderr, "Failed to get trigger count\n"); | |
158 | ret = -1; | |
159 | goto end; | |
160 | } | |
161 | ||
7d59def2 | 162 | /* Look for the trigger we want to subscribe to. */ |
6ba31891 FD |
163 | for (i = 0; i < count; i++) { |
164 | const struct lttng_trigger *trigger = | |
165 | lttng_triggers_get_at_index(triggers, i); | |
166 | const struct lttng_condition *condition = | |
167 | lttng_trigger_get_const_condition(trigger); | |
168 | const struct lttng_action *action = | |
169 | lttng_trigger_get_const_action(trigger); | |
170 | const enum lttng_action_type action_type = | |
171 | lttng_action_get_type(action); | |
172 | enum lttng_notification_channel_status channel_status; | |
173 | const char *trigger_name = NULL; | |
174 | ||
175 | lttng_trigger_get_name(trigger, &trigger_name); | |
176 | if (strcmp(trigger_name, expected_trigger_name)) { | |
6ffce1f5 JR |
177 | /* Might match the end event trigger */ |
178 | if (end_trigger_name != NULL && | |
179 | strcmp(trigger_name, | |
180 | end_trigger_name)) { | |
181 | continue; | |
182 | } | |
6ba31891 | 183 | } |
7c2fae7c | 184 | if (!((action_type == LTTNG_ACTION_TYPE_LIST && |
702f26c8 | 185 | action_list_contains_notify(action)) || |
6ba31891 FD |
186 | action_type == LTTNG_ACTION_TYPE_NOTIFY)) { |
187 | /* "The action of trigger is not notify, skipping. */ | |
188 | continue; | |
189 | } | |
190 | ||
191 | channel_status = lttng_notification_channel_subscribe( | |
192 | notification_channel, condition); | |
193 | if (channel_status) { | |
194 | fprintf(stderr, "Failed to subscribe to notifications of trigger \"%s\"\n", | |
195 | trigger_name); | |
196 | ret = -1; | |
197 | goto end; | |
198 | } | |
199 | ||
200 | subcription_count++; | |
201 | } | |
202 | ||
203 | if (subcription_count == 0) { | |
6ffce1f5 JR |
204 | fprintf(stderr, "No matching trigger with a notify action found.\n"); |
205 | ret = -1; | |
6ba31891 FD |
206 | goto end; |
207 | } | |
208 | ||
6ffce1f5 JR |
209 | if (end_trigger_name != NULL && subcription_count != 2) { |
210 | fprintf(stderr, "No matching end event trigger with a notify action found.\n"); | |
211 | ret = -1; | |
212 | goto end; | |
213 | } | |
6ba31891 FD |
214 | |
215 | /* | |
216 | * We registered to the notification of our target trigger. We can now | |
217 | * create the sync file to signify that we are ready. | |
218 | */ | |
219 | ret = create_file(after_notif_register_file_path); | |
220 | if (ret != 0) { | |
221 | goto end; | |
222 | } | |
223 | ||
224 | for (;;) { | |
225 | struct lttng_notification *notification; | |
226 | enum lttng_notification_channel_status channel_status; | |
227 | ||
228 | channel_status = | |
229 | lttng_notification_channel_get_next_notification( | |
230 | notification_channel, | |
231 | ¬ification); | |
232 | switch (channel_status) { | |
233 | case LTTNG_NOTIFICATION_CHANNEL_STATUS_NOTIFICATIONS_DROPPED: | |
234 | printf("Dropped notification\n"); | |
7d59def2 JR |
235 | ret = -1; |
236 | goto end; | |
6ba31891 | 237 | case LTTNG_NOTIFICATION_CHANNEL_STATUS_INTERRUPTED: |
7d59def2 | 238 | ret = -1; |
6ba31891 FD |
239 | goto end; |
240 | case LTTNG_NOTIFICATION_CHANNEL_STATUS_OK: | |
241 | break; | |
242 | case LTTNG_NOTIFICATION_CHANNEL_STATUS_CLOSED: | |
243 | printf("Notification channel was closed by peer.\n"); | |
244 | break; | |
245 | default: | |
246 | fprintf(stderr, "A communication error occurred on the notification channel.\n"); | |
247 | ret = -1; | |
248 | goto end; | |
249 | } | |
250 | ||
6ffce1f5 JR |
251 | /* Early exit check. */ |
252 | if (end_trigger_name != NULL && | |
253 | is_trigger_name(end_trigger_name, | |
254 | notification)) { | |
255 | /* Exit the loop immediately. */ | |
256 | printf("Received end event notification from trigger %s\n", | |
257 | end_trigger_name); | |
258 | lttng_notification_destroy(notification); | |
259 | goto evaluate_success; | |
260 | } | |
261 | ||
7d59def2 | 262 | ret = is_trigger_name(expected_trigger_name, notification); |
6ba31891 | 263 | lttng_notification_destroy(notification); |
7d59def2 JR |
264 | if (!ret) { |
265 | ret = -1; | |
266 | goto end; | |
6ffce1f5 JR |
267 | } |
268 | ||
269 | printf("Received event notification from trigger %s\n", | |
270 | expected_trigger_name); | |
271 | notification_count++; | |
272 | if (end_trigger_name == NULL && | |
273 | expected_notifications == notification_count) { | |
274 | /* | |
275 | * Here the loop exit is controlled by the number of | |
276 | * notification and not by the reception of the end | |
277 | * event trigger notification. This represent the | |
278 | * default behavior. | |
279 | * | |
280 | */ | |
281 | goto evaluate_success; | |
6ba31891 FD |
282 | } |
283 | } | |
6ffce1f5 JR |
284 | |
285 | evaluate_success: | |
286 | if (expected_notifications == notification_count) { | |
287 | /* Success */ | |
288 | ret = 0; | |
289 | } else { | |
290 | fprintf(stderr, "Expected %d notification got %d\n", | |
291 | expected_notifications, notification_count); | |
292 | ret = 1; | |
293 | } | |
294 | ||
6ba31891 FD |
295 | end: |
296 | lttng_triggers_destroy(triggers); | |
297 | lttng_notification_channel_destroy(notification_channel); | |
3e68c9e8 JG |
298 | free(after_notif_register_file_path); |
299 | free(end_trigger_name); | |
300 | free(expected_trigger_name); | |
6ba31891 FD |
301 | return !!ret; |
302 | } |