Add CPU hotplug support
[lttng-tools.git] / ltt-sessiond / session.c
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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 *
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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
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20#include <stdio.h>
21#include <stdlib.h>
22#include <string.h>
b082db07 23#include <time.h>
5b74c7b1 24#include <urcu/list.h>
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25
26#include "lttngerr.h"
27#include "session.h"
28
29/* Variables */
30static unsigned int session_count;
31
32/* Static internal function */
33static void add_session_list(struct ltt_session *ls);
34static void del_session_list(struct ltt_session *ls);
35
1d4b027a 36/* Init global session list */
8c0faa1d 37struct ltt_session_list ltt_session_list = {
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38 .head = CDS_LIST_HEAD_INIT(ltt_session_list.head),
39};
40
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41/*
42 * get_session_list
43 *
44 * Return a pointer to the session list.
45 */
46struct ltt_session_list *get_session_list(void)
47{
48 return &ltt_session_list;
49}
50
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51/*
52 * get_session_count
53 *
54 * Return session_count
55 */
56unsigned int get_session_count(void)
57{
58 return session_count;
59}
60
61/*
62 * add_session_list
63 *
64 * Add a ltt_session structure to the global list.
65 */
66static void add_session_list(struct ltt_session *ls)
67{
68 cds_list_add(&ls->list, &ltt_session_list.head);
69 session_count++;
70}
71
72/*
73 * del_session_list
74 *
75 * Delete a ltt_session structure to the global list.
76 */
77static void del_session_list(struct ltt_session *ls)
78{
79 cds_list_del(&ls->list);
80 /* Sanity check */
81 if (session_count != 0) {
82 session_count--;
83 }
84}
85
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86/*
87 * find_session_by_name
88 *
89 * Return a ltt_session structure ptr that matches name.
90 * If no session found, NULL is returned.
91 */
92struct ltt_session *find_session_by_name(char *name)
93{
94 int found = 0;
95 struct ltt_session *iter;
96
97 cds_list_for_each_entry(iter, &ltt_session_list.head, list) {
b42dc92c 98 if (strncmp(iter->name, name, strlen(name)) == 0) {
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99 found = 1;
100 break;
101 }
102 }
103
104 if (!found) {
105 iter = NULL;
106 }
107
108 return iter;
109}
110
111/*
112 * destroy_session
113 *
114 * Delete session from the global session list
115 * and free the memory.
116 *
117 * Return -1 if no session is found.
118 * On success, return 1;
119 */
f3ed775e 120int destroy_session(char *name)
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121{
122 int found = -1;
123 struct ltt_session *iter;
124
125 cds_list_for_each_entry(iter, &ltt_session_list.head, list) {
f3ed775e 126 if (strcmp(iter->name, name) == 0) {
e07ae692 127 DBG("Destroying session %s", iter->name);
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128 del_session_list(iter);
129 free(iter);
130 found = 1;
131 break;
132 }
133 }
134
135 return found;
136}
137
138/*
139 * create_session
140 *
f3ed775e 141 * Create a brand new session and add it to the global session list.
5b74c7b1 142 */
f3ed775e 143int create_session(char *name, char *path)
5b74c7b1 144{
f3ed775e 145 int ret;
b082db07 146 char date_time[NAME_MAX];
5b74c7b1 147 struct ltt_session *new_session;
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148 time_t rawtime;
149 struct tm *timeinfo;
e07ae692 150
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151 new_session = find_session_by_name(name);
152 if (new_session != NULL) {
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153 ret = -EEXIST;
154 goto error_exist;
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155 }
156
157 /* Allocate session data structure */
158 new_session = malloc(sizeof(struct ltt_session));
159 if (new_session == NULL) {
160 perror("malloc");
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161 ret = -ENOMEM;
162 goto error_malloc;
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163 }
164
f3ed775e 165 /* Define session name */
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166 if (name != NULL) {
167 if (asprintf(&new_session->name, "%s", name) < 0) {
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168 ret = -ENOMEM;
169 goto error_asprintf;
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170 }
171 } else {
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172 ERR("No session name given");
173 ret = -1;
174 goto error;
175 }
176
177 /* Define session system path */
178 if (path != NULL) {
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179 if (strstr(name, "auto-") == NULL) {
180 time(&rawtime);
181 timeinfo = localtime(&rawtime);
182 strftime(date_time, sizeof(date_time), "-%Y%m%d-%H%M%S", timeinfo);
183 } else {
184 date_time[0] = '\0';
185 }
186
187 if (asprintf(&new_session->path, "%s/%s%s", path, name, date_time) < 0) {
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188 ret = -ENOMEM;
189 goto error_asprintf;
5b74c7b1 190 }
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191 } else {
192 ERR("No session path given");
193 ret = -1;
194 goto error;
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195 }
196
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197 /*
198 * Set consumer (identifier) to 0. This means that there is
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199 * NO consumer attach to that session yet.
200 */
201 new_session->ust_consumer = 0;
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202
203 /* Init kernel session */
204 new_session->kernel_session = NULL;
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205
206 /* Init list */
207 CDS_INIT_LIST_HEAD(&new_session->ust_traces);
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208
209 /* Set trace list counter */
210 new_session->ust_trace_count = 0;
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211
212 /* Add new session to the global session list */
213 add_session_list(new_session);
214
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215 DBG("Tracing session %s created in %s", name, new_session->path);
216
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217 return 0;
218
219error:
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220error_asprintf:
221 if (new_session != NULL) {
222 free(new_session);
223 }
5b74c7b1 224
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225error_exist:
226error_malloc:
227 return ret;
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228}
229
230/*
231 * get_lttng_session
232 *
f3ed775e 233 * Iterate over the global session list and fill the lttng_session array.
5b74c7b1 234 */
5461b305 235void get_lttng_session(struct lttng_session *sessions)
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236{
237 int i = 0;
238 struct ltt_session *iter;
239 struct lttng_session lsess;
240
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241 DBG("Getting all available session");
242
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243 /* Iterate over session list and append data after
244 * the control struct in the buffer.
245 */
246 cds_list_for_each_entry(iter, &ltt_session_list.head, list) {
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247 strncpy(lsess.path, iter->path, sizeof(lsess.path));
248 lsess.path[sizeof(lsess.path) - 1] = '\0';
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249 strncpy(lsess.name, iter->name, sizeof(lsess.name));
250 lsess.name[sizeof(lsess.name) - 1] = '\0';
5461b305 251 memcpy(&sessions[i], &lsess, sizeof(lsess));
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252 i++;
253 /* Reset struct for next pass */
254 memset(&lsess, 0, sizeof(lsess));
255 }
256}
257
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