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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 | ||
e393070a | 17 | #include <lttng/condition/on-event.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 FD |
26 | {"sync-after-notif-register", required_argument, 0, 'a'}, |
27 | {0, 0, 0, 0} | |
28 | }; | |
29 | ||
30 | static bool action_group_contains_notify( | |
31 | const struct lttng_action *action_group) | |
32 | { | |
33 | unsigned int i, count; | |
34 | enum lttng_action_status status = | |
35 | lttng_action_group_get_count(action_group, &count); | |
36 | ||
37 | if (status != LTTNG_ACTION_STATUS_OK) { | |
38 | printf("Failed to get action count from action group\n"); | |
39 | exit(1); | |
40 | } | |
41 | ||
42 | for (i = 0; i < count; i++) { | |
43 | const struct lttng_action *action = | |
44 | lttng_action_group_get_at_index( | |
45 | action_group, i); | |
46 | const enum lttng_action_type action_type = | |
47 | lttng_action_get_type(action); | |
48 | ||
49 | if (action_type == LTTNG_ACTION_TYPE_NOTIFY) { | |
50 | return true; | |
51 | } | |
52 | } | |
53 | return false; | |
54 | } | |
55 | ||
7d59def2 | 56 | static bool is_trigger_name(const char *expected_trigger_name, |
6ba31891 FD |
57 | struct lttng_notification *notification) |
58 | { | |
65f64978 JG |
59 | const char *trigger_name = NULL; |
60 | enum lttng_trigger_status trigger_status; | |
61 | const struct lttng_trigger *trigger; | |
62 | bool names_match; | |
6ba31891 | 63 | |
65f64978 JG |
64 | trigger = lttng_notification_get_trigger(notification); |
65 | if (!trigger) { | |
66 | fprintf(stderr, "Failed to get trigger from notification\n"); | |
67 | names_match = false; | |
68 | goto end; | |
6ba31891 | 69 | } |
65f64978 JG |
70 | |
71 | trigger_status = lttng_trigger_get_name(trigger, &trigger_name); | |
72 | if (trigger_status != LTTNG_TRIGGER_STATUS_OK) { | |
73 | fprintf(stderr, "Failed to get name from notification's trigger\n"); | |
74 | names_match = false; | |
75 | goto end; | |
6ba31891 FD |
76 | } |
77 | ||
65f64978 | 78 | names_match = strcmp(expected_trigger_name, trigger_name) == 0; |
7d59def2 JR |
79 | if (!names_match) { |
80 | fprintf(stderr, "Got an unexpected trigger name: name = '%s', expected name = '%s'\n", | |
81 | trigger_name, expected_trigger_name); | |
82 | } | |
65f64978 JG |
83 | end: |
84 | return names_match; | |
6ba31891 FD |
85 | } |
86 | ||
87 | int main(int argc, char **argv) | |
88 | { | |
89 | int ret; | |
90 | int option; | |
91 | int option_index; | |
92 | const char *expected_trigger_name = NULL; | |
93 | struct lttng_triggers *triggers = NULL; | |
94 | unsigned int count, i, subcription_count = 0; | |
95 | enum lttng_trigger_status trigger_status; | |
96 | char *after_notif_register_file_path = NULL; | |
97 | struct lttng_notification_channel *notification_channel = NULL; | |
98 | ||
99 | while ((option = getopt_long(argc, argv, "a:t:", | |
100 | long_options, &option_index)) != -1) { | |
101 | switch (option) { | |
102 | case 'a': | |
103 | after_notif_register_file_path = strdup(optarg); | |
104 | break; | |
105 | case 't': | |
106 | expected_trigger_name = strdup(optarg); | |
107 | break; | |
108 | case '?': | |
109 | /* getopt_long already printed an error message. */ | |
110 | default: | |
111 | ret = -1; | |
112 | goto end; | |
113 | } | |
114 | } | |
115 | ||
116 | if (optind != argc) { | |
117 | ret = -1; | |
118 | goto end; | |
119 | } | |
120 | ||
121 | ||
122 | notification_channel = lttng_notification_channel_create( | |
123 | lttng_session_daemon_notification_endpoint); | |
124 | if (!notification_channel) { | |
125 | fprintf(stderr, "Failed to create notification channel\n"); | |
126 | ret = -1; | |
127 | goto end; | |
128 | } | |
129 | ||
130 | ret = lttng_list_triggers(&triggers); | |
131 | if (ret != LTTNG_OK) { | |
132 | fprintf(stderr, "Failed to list triggers\n"); | |
7d59def2 | 133 | ret = -1; |
6ba31891 FD |
134 | goto end; |
135 | } | |
136 | ||
137 | trigger_status = lttng_triggers_get_count(triggers, &count); | |
138 | if (trigger_status != LTTNG_TRIGGER_STATUS_OK) { | |
139 | fprintf(stderr, "Failed to get trigger count\n"); | |
140 | ret = -1; | |
141 | goto end; | |
142 | } | |
143 | ||
7d59def2 | 144 | /* Look for the trigger we want to subscribe to. */ |
6ba31891 FD |
145 | for (i = 0; i < count; i++) { |
146 | const struct lttng_trigger *trigger = | |
147 | lttng_triggers_get_at_index(triggers, i); | |
148 | const struct lttng_condition *condition = | |
149 | lttng_trigger_get_const_condition(trigger); | |
150 | const struct lttng_action *action = | |
151 | lttng_trigger_get_const_action(trigger); | |
152 | const enum lttng_action_type action_type = | |
153 | lttng_action_get_type(action); | |
154 | enum lttng_notification_channel_status channel_status; | |
155 | const char *trigger_name = NULL; | |
156 | ||
157 | lttng_trigger_get_name(trigger, &trigger_name); | |
158 | if (strcmp(trigger_name, expected_trigger_name)) { | |
159 | continue; | |
160 | } | |
161 | ||
162 | if (!((action_type == LTTNG_ACTION_TYPE_GROUP && | |
163 | action_group_contains_notify(action)) || | |
164 | action_type == LTTNG_ACTION_TYPE_NOTIFY)) { | |
165 | /* "The action of trigger is not notify, skipping. */ | |
166 | continue; | |
167 | } | |
168 | ||
169 | channel_status = lttng_notification_channel_subscribe( | |
170 | notification_channel, condition); | |
171 | if (channel_status) { | |
172 | fprintf(stderr, "Failed to subscribe to notifications of trigger \"%s\"\n", | |
173 | trigger_name); | |
174 | ret = -1; | |
175 | goto end; | |
176 | } | |
177 | ||
178 | subcription_count++; | |
179 | } | |
180 | ||
181 | if (subcription_count == 0) { | |
182 | printf("No matching trigger with a notify action found.\n"); | |
183 | ret = 0; | |
184 | goto end; | |
185 | } | |
186 | ||
187 | ||
188 | /* | |
189 | * We registered to the notification of our target trigger. We can now | |
190 | * create the sync file to signify that we are ready. | |
191 | */ | |
192 | ret = create_file(after_notif_register_file_path); | |
193 | if (ret != 0) { | |
194 | goto end; | |
195 | } | |
196 | ||
197 | for (;;) { | |
198 | struct lttng_notification *notification; | |
199 | enum lttng_notification_channel_status channel_status; | |
200 | ||
201 | channel_status = | |
202 | lttng_notification_channel_get_next_notification( | |
203 | notification_channel, | |
204 | ¬ification); | |
205 | switch (channel_status) { | |
206 | case LTTNG_NOTIFICATION_CHANNEL_STATUS_NOTIFICATIONS_DROPPED: | |
207 | printf("Dropped notification\n"); | |
7d59def2 JR |
208 | ret = -1; |
209 | goto end; | |
6ba31891 | 210 | case LTTNG_NOTIFICATION_CHANNEL_STATUS_INTERRUPTED: |
7d59def2 | 211 | ret = -1; |
6ba31891 FD |
212 | goto end; |
213 | case LTTNG_NOTIFICATION_CHANNEL_STATUS_OK: | |
214 | break; | |
215 | case LTTNG_NOTIFICATION_CHANNEL_STATUS_CLOSED: | |
216 | printf("Notification channel was closed by peer.\n"); | |
7d59def2 | 217 | ret = -1; |
6ba31891 FD |
218 | break; |
219 | default: | |
220 | fprintf(stderr, "A communication error occurred on the notification channel.\n"); | |
221 | ret = -1; | |
222 | goto end; | |
223 | } | |
224 | ||
7d59def2 | 225 | ret = is_trigger_name(expected_trigger_name, notification); |
6ba31891 | 226 | lttng_notification_destroy(notification); |
7d59def2 JR |
227 | if (!ret) { |
228 | ret = -1; | |
229 | goto end; | |
230 | } else { | |
6ba31891 FD |
231 | ret = 0; |
232 | goto end; | |
233 | } | |
234 | } | |
235 | end: | |
236 | lttng_triggers_destroy(triggers); | |
237 | lttng_notification_channel_destroy(notification_channel); | |
238 | return !!ret; | |
239 | } |