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5b74c7b1 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version 2 | |
7 | * of the License, or (at your option) any later version. | |
91d76f53 | 8 | * |
5b74c7b1 DG |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
17 | */ | |
18 | ||
19 | #define _GNU_SOURCE | |
b5541356 | 20 | #include <pthread.h> |
5b74c7b1 DG |
21 | #include <stdio.h> |
22 | #include <stdlib.h> | |
23 | #include <string.h> | |
b082db07 | 24 | #include <time.h> |
5b74c7b1 | 25 | #include <urcu/list.h> |
5b74c7b1 DG |
26 | |
27 | #include "lttngerr.h" | |
28 | #include "session.h" | |
29 | ||
8c0faa1d | 30 | /* |
b5541356 | 31 | * NOTES: |
8c0faa1d | 32 | * |
b5541356 DG |
33 | * No ltt_session.lock is taken here because those data structure are widely |
34 | * spread across the lttng-tools code base so before caling functions below | |
35 | * that can read/write a session, the caller MUST acquire the session lock | |
36 | * using lock_session() and unlock_session(). | |
8c0faa1d | 37 | */ |
8c0faa1d | 38 | |
5b74c7b1 | 39 | /* |
b5541356 | 40 | * Init tracing session list. |
5b74c7b1 | 41 | * |
b5541356 | 42 | * Please see session.h for more explanation and correct usage of the list. |
5b74c7b1 | 43 | */ |
b5541356 DG |
44 | static struct ltt_session_list ltt_session_list = { |
45 | .head = CDS_LIST_HEAD_INIT(ltt_session_list.head), | |
46 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
47 | .count = 0, | |
48 | }; | |
5b74c7b1 DG |
49 | |
50 | /* | |
51 | * add_session_list | |
52 | * | |
53 | * Add a ltt_session structure to the global list. | |
b5541356 DG |
54 | * |
55 | * The caller MUST acquire the session list lock before. | |
5b74c7b1 DG |
56 | */ |
57 | static void add_session_list(struct ltt_session *ls) | |
58 | { | |
59 | cds_list_add(&ls->list, <t_session_list.head); | |
b5541356 | 60 | ltt_session_list.count++; |
5b74c7b1 DG |
61 | } |
62 | ||
63 | /* | |
64 | * del_session_list | |
65 | * | |
66 | * Delete a ltt_session structure to the global list. | |
b5541356 DG |
67 | * |
68 | * The caller MUST acquire the session list lock before. | |
5b74c7b1 DG |
69 | */ |
70 | static void del_session_list(struct ltt_session *ls) | |
71 | { | |
72 | cds_list_del(&ls->list); | |
73 | /* Sanity check */ | |
b5541356 DG |
74 | if (ltt_session_list.count > 0) { |
75 | ltt_session_list.count--; | |
5b74c7b1 DG |
76 | } |
77 | } | |
78 | ||
b5541356 DG |
79 | /* |
80 | * get_session_list | |
81 | * | |
82 | * Return a pointer to the session list. | |
83 | */ | |
84 | struct ltt_session_list *get_session_list(void) | |
85 | { | |
86 | return <t_session_list; | |
87 | } | |
88 | ||
89 | /* | |
90 | * Acquire session lock | |
91 | */ | |
92 | void lock_session(struct ltt_session *session) | |
93 | { | |
94 | pthread_mutex_lock(&session->lock); | |
95 | } | |
96 | ||
97 | /* | |
98 | * Release session lock | |
99 | */ | |
100 | void unlock_session(struct ltt_session *session) | |
101 | { | |
102 | pthread_mutex_unlock(&session->lock); | |
103 | } | |
104 | ||
105 | /* | |
106 | * get_session_count | |
107 | * | |
108 | * Return session_count | |
109 | */ | |
110 | unsigned int get_session_count(void) | |
111 | { | |
112 | unsigned int count; | |
113 | ||
114 | pthread_mutex_lock(<t_session_list.lock); | |
115 | count = ltt_session_list.count; | |
116 | pthread_mutex_unlock(<t_session_list.lock); | |
117 | ||
118 | return count; | |
119 | } | |
120 | ||
5b74c7b1 DG |
121 | /* |
122 | * find_session_by_name | |
123 | * | |
124 | * Return a ltt_session structure ptr that matches name. | |
125 | * If no session found, NULL is returned. | |
126 | */ | |
127 | struct ltt_session *find_session_by_name(char *name) | |
128 | { | |
129 | int found = 0; | |
130 | struct ltt_session *iter; | |
131 | ||
b5541356 | 132 | pthread_mutex_lock(<t_session_list.lock); |
5b74c7b1 | 133 | cds_list_for_each_entry(iter, <t_session_list.head, list) { |
b42dc92c | 134 | if (strncmp(iter->name, name, strlen(name)) == 0) { |
5b74c7b1 DG |
135 | found = 1; |
136 | break; | |
137 | } | |
138 | } | |
b5541356 | 139 | pthread_mutex_unlock(<t_session_list.lock); |
5b74c7b1 DG |
140 | |
141 | if (!found) { | |
142 | iter = NULL; | |
143 | } | |
144 | ||
145 | return iter; | |
146 | } | |
147 | ||
148 | /* | |
149 | * destroy_session | |
150 | * | |
b5541356 | 151 | * Delete session from the session list and free the memory. |
5b74c7b1 | 152 | * |
b5541356 | 153 | * Return -1 if no session is found. On success, return 1; |
5b74c7b1 | 154 | */ |
f3ed775e | 155 | int destroy_session(char *name) |
5b74c7b1 DG |
156 | { |
157 | int found = -1; | |
158 | struct ltt_session *iter; | |
159 | ||
b5541356 | 160 | pthread_mutex_lock(<t_session_list.lock); |
5b74c7b1 | 161 | cds_list_for_each_entry(iter, <t_session_list.head, list) { |
f3ed775e | 162 | if (strcmp(iter->name, name) == 0) { |
e07ae692 | 163 | DBG("Destroying session %s", iter->name); |
5b74c7b1 | 164 | del_session_list(iter); |
b5541356 DG |
165 | free(iter->name); |
166 | free(iter->path); | |
167 | pthread_mutex_destroy(&iter->lock); | |
5b74c7b1 DG |
168 | free(iter); |
169 | found = 1; | |
170 | break; | |
171 | } | |
172 | } | |
b5541356 | 173 | pthread_mutex_unlock(<t_session_list.lock); |
5b74c7b1 DG |
174 | |
175 | return found; | |
176 | } | |
177 | ||
178 | /* | |
179 | * create_session | |
180 | * | |
b5541356 | 181 | * Create a brand new session and add it to the session list. |
5b74c7b1 | 182 | */ |
f3ed775e | 183 | int create_session(char *name, char *path) |
5b74c7b1 | 184 | { |
f3ed775e | 185 | int ret; |
b082db07 | 186 | char date_time[NAME_MAX]; |
5b74c7b1 | 187 | struct ltt_session *new_session; |
b082db07 DG |
188 | time_t rawtime; |
189 | struct tm *timeinfo; | |
e07ae692 | 190 | |
5b74c7b1 DG |
191 | new_session = find_session_by_name(name); |
192 | if (new_session != NULL) { | |
f3ed775e DG |
193 | ret = -EEXIST; |
194 | goto error_exist; | |
5b74c7b1 DG |
195 | } |
196 | ||
197 | /* Allocate session data structure */ | |
198 | new_session = malloc(sizeof(struct ltt_session)); | |
199 | if (new_session == NULL) { | |
200 | perror("malloc"); | |
f3ed775e DG |
201 | ret = -ENOMEM; |
202 | goto error_malloc; | |
5b74c7b1 DG |
203 | } |
204 | ||
f3ed775e | 205 | /* Define session name */ |
5b74c7b1 DG |
206 | if (name != NULL) { |
207 | if (asprintf(&new_session->name, "%s", name) < 0) { | |
f3ed775e DG |
208 | ret = -ENOMEM; |
209 | goto error_asprintf; | |
5b74c7b1 DG |
210 | } |
211 | } else { | |
f3ed775e DG |
212 | ERR("No session name given"); |
213 | ret = -1; | |
214 | goto error; | |
215 | } | |
216 | ||
217 | /* Define session system path */ | |
218 | if (path != NULL) { | |
b082db07 DG |
219 | if (strstr(name, "auto-") == NULL) { |
220 | time(&rawtime); | |
221 | timeinfo = localtime(&rawtime); | |
222 | strftime(date_time, sizeof(date_time), "-%Y%m%d-%H%M%S", timeinfo); | |
223 | } else { | |
224 | date_time[0] = '\0'; | |
225 | } | |
226 | ||
227 | if (asprintf(&new_session->path, "%s/%s%s", path, name, date_time) < 0) { | |
f3ed775e DG |
228 | ret = -ENOMEM; |
229 | goto error_asprintf; | |
5b74c7b1 | 230 | } |
f3ed775e DG |
231 | } else { |
232 | ERR("No session path given"); | |
233 | ret = -1; | |
234 | goto error; | |
5b74c7b1 DG |
235 | } |
236 | ||
1d4b027a DG |
237 | /* Init kernel session */ |
238 | new_session->kernel_session = NULL; | |
5b74c7b1 DG |
239 | |
240 | /* Init list */ | |
241 | CDS_INIT_LIST_HEAD(&new_session->ust_traces); | |
1657e9bb DG |
242 | |
243 | /* Set trace list counter */ | |
244 | new_session->ust_trace_count = 0; | |
5b74c7b1 | 245 | |
b5541356 DG |
246 | /* Add new session to the session list */ |
247 | pthread_mutex_lock(<t_session_list.lock); | |
5b74c7b1 | 248 | add_session_list(new_session); |
b5541356 DG |
249 | pthread_mutex_unlock(<t_session_list.lock); |
250 | ||
251 | /* Init lock */ | |
252 | pthread_mutex_init(&new_session->lock, NULL); | |
5b74c7b1 | 253 | |
b5541356 | 254 | DBG("Tracing session %s created in %s", new_session->name, new_session->path); |
b082db07 | 255 | |
5b74c7b1 DG |
256 | return 0; |
257 | ||
258 | error: | |
f3ed775e DG |
259 | error_asprintf: |
260 | if (new_session != NULL) { | |
261 | free(new_session); | |
262 | } | |
5b74c7b1 | 263 | |
f3ed775e DG |
264 | error_exist: |
265 | error_malloc: | |
266 | return ret; | |
5b74c7b1 DG |
267 | } |
268 | ||
269 | /* | |
270 | * get_lttng_session | |
271 | * | |
f3ed775e | 272 | * Iterate over the global session list and fill the lttng_session array. |
5b74c7b1 | 273 | */ |
5461b305 | 274 | void get_lttng_session(struct lttng_session *sessions) |
5b74c7b1 DG |
275 | { |
276 | int i = 0; | |
277 | struct ltt_session *iter; | |
278 | struct lttng_session lsess; | |
279 | ||
e07ae692 DG |
280 | DBG("Getting all available session"); |
281 | ||
b5541356 DG |
282 | /* |
283 | * Iterate over session list and append data after the control struct in | |
284 | * the buffer. | |
5b74c7b1 | 285 | */ |
b5541356 | 286 | pthread_mutex_lock(<t_session_list.lock); |
5b74c7b1 | 287 | cds_list_for_each_entry(iter, <t_session_list.head, list) { |
f3ed775e DG |
288 | strncpy(lsess.path, iter->path, sizeof(lsess.path)); |
289 | lsess.path[sizeof(lsess.path) - 1] = '\0'; | |
5b74c7b1 DG |
290 | strncpy(lsess.name, iter->name, sizeof(lsess.name)); |
291 | lsess.name[sizeof(lsess.name) - 1] = '\0'; | |
5461b305 | 292 | memcpy(&sessions[i], &lsess, sizeof(lsess)); |
5b74c7b1 DG |
293 | i++; |
294 | /* Reset struct for next pass */ | |
295 | memset(&lsess, 0, sizeof(lsess)); | |
296 | } | |
b5541356 | 297 | pthread_mutex_unlock(<t_session_list.lock); |
5b74c7b1 DG |
298 | } |
299 |