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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. */ | |
25 | {"trigger", required_argument, 0, 'i'}, | |
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 | ||
56 | static bool is_expected_trigger_name(const char *expected_trigger_name, | |
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 JG |
78 | names_match = strcmp(expected_trigger_name, trigger_name) == 0; |
79 | end: | |
80 | return names_match; | |
6ba31891 FD |
81 | } |
82 | ||
83 | int main(int argc, char **argv) | |
84 | { | |
85 | int ret; | |
86 | int option; | |
87 | int option_index; | |
88 | const char *expected_trigger_name = NULL; | |
89 | struct lttng_triggers *triggers = NULL; | |
90 | unsigned int count, i, subcription_count = 0; | |
91 | enum lttng_trigger_status trigger_status; | |
92 | char *after_notif_register_file_path = NULL; | |
93 | struct lttng_notification_channel *notification_channel = NULL; | |
94 | ||
95 | while ((option = getopt_long(argc, argv, "a:t:", | |
96 | long_options, &option_index)) != -1) { | |
97 | switch (option) { | |
98 | case 'a': | |
99 | after_notif_register_file_path = strdup(optarg); | |
100 | break; | |
101 | case 't': | |
102 | expected_trigger_name = strdup(optarg); | |
103 | break; | |
104 | case '?': | |
105 | /* getopt_long already printed an error message. */ | |
106 | default: | |
107 | ret = -1; | |
108 | goto end; | |
109 | } | |
110 | } | |
111 | ||
112 | if (optind != argc) { | |
113 | ret = -1; | |
114 | goto end; | |
115 | } | |
116 | ||
117 | ||
118 | notification_channel = lttng_notification_channel_create( | |
119 | lttng_session_daemon_notification_endpoint); | |
120 | if (!notification_channel) { | |
121 | fprintf(stderr, "Failed to create notification channel\n"); | |
122 | ret = -1; | |
123 | goto end; | |
124 | } | |
125 | ||
126 | ret = lttng_list_triggers(&triggers); | |
127 | if (ret != LTTNG_OK) { | |
128 | fprintf(stderr, "Failed to list triggers\n"); | |
129 | goto end; | |
130 | } | |
131 | ||
132 | trigger_status = lttng_triggers_get_count(triggers, &count); | |
133 | if (trigger_status != LTTNG_TRIGGER_STATUS_OK) { | |
134 | fprintf(stderr, "Failed to get trigger count\n"); | |
135 | ret = -1; | |
136 | goto end; | |
137 | } | |
138 | ||
139 | for (i = 0; i < count; i++) { | |
140 | const struct lttng_trigger *trigger = | |
141 | lttng_triggers_get_at_index(triggers, i); | |
142 | const struct lttng_condition *condition = | |
143 | lttng_trigger_get_const_condition(trigger); | |
144 | const struct lttng_action *action = | |
145 | lttng_trigger_get_const_action(trigger); | |
146 | const enum lttng_action_type action_type = | |
147 | lttng_action_get_type(action); | |
148 | enum lttng_notification_channel_status channel_status; | |
149 | const char *trigger_name = NULL; | |
150 | ||
151 | lttng_trigger_get_name(trigger, &trigger_name); | |
152 | if (strcmp(trigger_name, expected_trigger_name)) { | |
153 | continue; | |
154 | } | |
155 | ||
156 | if (!((action_type == LTTNG_ACTION_TYPE_GROUP && | |
157 | action_group_contains_notify(action)) || | |
158 | action_type == LTTNG_ACTION_TYPE_NOTIFY)) { | |
159 | /* "The action of trigger is not notify, skipping. */ | |
160 | continue; | |
161 | } | |
162 | ||
163 | channel_status = lttng_notification_channel_subscribe( | |
164 | notification_channel, condition); | |
165 | if (channel_status) { | |
166 | fprintf(stderr, "Failed to subscribe to notifications of trigger \"%s\"\n", | |
167 | trigger_name); | |
168 | ret = -1; | |
169 | goto end; | |
170 | } | |
171 | ||
172 | subcription_count++; | |
173 | } | |
174 | ||
175 | if (subcription_count == 0) { | |
176 | printf("No matching trigger with a notify action found.\n"); | |
177 | ret = 0; | |
178 | goto end; | |
179 | } | |
180 | ||
181 | ||
182 | /* | |
183 | * We registered to the notification of our target trigger. We can now | |
184 | * create the sync file to signify that we are ready. | |
185 | */ | |
186 | ret = create_file(after_notif_register_file_path); | |
187 | if (ret != 0) { | |
188 | goto end; | |
189 | } | |
190 | ||
191 | for (;;) { | |
192 | struct lttng_notification *notification; | |
193 | enum lttng_notification_channel_status channel_status; | |
194 | ||
195 | channel_status = | |
196 | lttng_notification_channel_get_next_notification( | |
197 | notification_channel, | |
198 | ¬ification); | |
199 | switch (channel_status) { | |
200 | case LTTNG_NOTIFICATION_CHANNEL_STATUS_NOTIFICATIONS_DROPPED: | |
201 | printf("Dropped notification\n"); | |
202 | break; | |
203 | case LTTNG_NOTIFICATION_CHANNEL_STATUS_INTERRUPTED: | |
204 | ret = 0; | |
205 | goto end; | |
206 | case LTTNG_NOTIFICATION_CHANNEL_STATUS_OK: | |
207 | break; | |
208 | case LTTNG_NOTIFICATION_CHANNEL_STATUS_CLOSED: | |
209 | printf("Notification channel was closed by peer.\n"); | |
210 | break; | |
211 | default: | |
212 | fprintf(stderr, "A communication error occurred on the notification channel.\n"); | |
213 | ret = -1; | |
214 | goto end; | |
215 | } | |
216 | ||
217 | ret = is_expected_trigger_name(expected_trigger_name, | |
218 | notification); | |
219 | lttng_notification_destroy(notification); | |
220 | if (ret) { | |
221 | ret = 0; | |
222 | goto end; | |
223 | } | |
224 | } | |
225 | end: | |
226 | lttng_triggers_destroy(triggers); | |
227 | lttng_notification_channel_destroy(notification_channel); | |
228 | return !!ret; | |
229 | } |