604024b18b00f7e56c4da266ef9ea518096c4307
[lttng-tools.git] / lttng-sessiond / trace-ust.h
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; only version 2
7 * of the License.
8 *
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 #ifndef _LTT_TRACE_UST_H
20 #define _LTT_TRACE_UST_H
21
22 #include <config.h>
23 #include <limits.h>
24 #include <urcu.h>
25 #include <urcu/list.h>
26 #include <lttng/lttng.h>
27
28 #include "ust-ctl.h"
29
30 #include "../hashtable/rculfhash.h"
31
32 /* UST Stream list */
33 struct ltt_ust_stream_list {
34 unsigned int count;
35 struct cds_list_head head;
36 };
37
38 /* Context hash table nodes */
39 struct ltt_ust_context {
40 struct lttng_ust_context ctx;
41 struct cds_lfht_node node;
42 };
43
44 /* UST event */
45 struct ltt_ust_event {
46 struct lttng_ust_event attr;
47 struct cds_lfht *ctx;
48 struct cds_lfht_node node;
49 };
50
51 /* UST stream */
52 struct ltt_ust_stream {
53 int handle;
54 char pathname[PATH_MAX];
55 struct lttng_ust_object_data *obj;
56 /* Using a list of streams to keep order. */
57 struct cds_list_head list;
58 };
59
60 /* UST channel */
61 struct ltt_ust_channel {
62 char name[LTTNG_UST_SYM_NAME_LEN];
63 char pathname[PATH_MAX];
64 struct lttng_ust_channel attr;
65 struct cds_lfht *ctx;
66 struct cds_lfht *events;
67 struct cds_lfht_node node;
68 };
69
70 /* UST Metadata */
71 struct ltt_ust_metadata {
72 int handle;
73 struct lttng_ust_object_data *obj;
74 char pathname[PATH_MAX]; /* Trace file path name */
75 struct lttng_ust_channel attr;
76 struct lttng_ust_object_data *stream_obj;
77 };
78
79 /* UST domain global (LTTNG_DOMAIN_UST) */
80 struct ltt_ust_domain_global {
81 struct cds_lfht *channels;
82 };
83
84 /* UST domain pid (LTTNG_DOMAIN_UST_PID) */
85 struct ltt_ust_domain_pid {
86 pid_t pid;
87 struct cds_lfht *channels;
88 struct cds_lfht_node node;
89 };
90
91 /* UST domain exec name (LTTNG_DOMAIN_UST_EXEC_NAME) */
92 struct ltt_ust_domain_exec {
93 char exec_name[LTTNG_UST_SYM_NAME_LEN];
94 struct cds_lfht *channels;
95 struct cds_lfht_node node;
96 };
97
98 /* UST session */
99 struct ltt_ust_session {
100 int uid; /* Unique identifier of session */
101 int consumer_fds_sent;
102 int consumer_fd;
103 char pathname[PATH_MAX];
104 struct ltt_ust_domain_global domain_global;
105 /*
106 * Those two hash tables contains data for a specific UST domain and each
107 * contains a HT of channels. See ltt_ust_domain_exec and
108 * ltt_ust_domain_pid data structures.
109 */
110 struct cds_lfht *domain_pid;
111 struct cds_lfht *domain_exec;
112 };
113
114 #ifdef HAVE_LIBLTTNG_UST_CTL
115
116 /*
117 * Lookup functions. NULL is returned if not found.
118 */
119 struct ltt_ust_event *trace_ust_find_event_by_name(struct cds_lfht *ht,
120 char *name);
121 struct ltt_ust_channel *trace_ust_find_channel_by_name(struct cds_lfht *ht,
122 char *name);
123
124 /*
125 * Create functions malloc() the data structure.
126 */
127 struct ltt_ust_session *trace_ust_create_session(char *path, unsigned int uid,
128 struct lttng_domain *domain);
129 struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *attr,
130 char *path);
131 struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev);
132 struct ltt_ust_metadata *trace_ust_create_metadata(char *path);
133
134 /*
135 * Destroy functions free() the data structure and remove from linked list if
136 * it's applies.
137 */
138 void trace_ust_destroy_session(struct ltt_ust_session *session);
139 void trace_ust_destroy_metadata(struct ltt_ust_metadata *metadata);
140 void trace_ust_destroy_channel(struct ltt_ust_channel *channel);
141 void trace_ust_destroy_event(struct ltt_ust_event *event);
142
143 #else /* HAVE_LIBLTTNG_UST_CTL */
144
145 static inline
146 struct ltt_ust_event *trace_ust_find_event_by_name(struct cds_lfht *ht,
147 char *name)
148 {
149 return NULL;
150 }
151
152 static inline
153 struct ltt_ust_channel *trace_ust_find_channel_by_name(struct cds_lfht *ht,
154 char *name)
155 {
156 return NULL;
157 }
158
159 static inline
160 struct ltt_ust_session *trace_ust_create_session(char *path, pid_t pid,
161 struct lttng_domain *domain)
162 {
163 return NULL;
164 }
165 static inline
166 struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *attr,
167 char *path)
168 {
169 return NULL;
170 }
171 static inline
172 struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev)
173 {
174 return NULL;
175 }
176 static inline
177 struct ltt_ust_metadata *trace_ust_create_metadata(char *path)
178 {
179 return NULL;
180 }
181
182 static inline
183 void trace_ust_destroy_session(struct ltt_ust_session *session)
184 {
185 }
186
187 static inline
188 void trace_ust_destroy_metadata(struct ltt_ust_metadata *metadata)
189 {
190 }
191
192 static inline
193 void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
194 {
195 }
196
197 static inline
198 void trace_ust_destroy_event(struct ltt_ust_event *event)
199 {
200 }
201
202 #endif /* HAVE_LIBLTTNG_UST_CTL */
203
204 #endif /* _LTT_TRACE_UST_H */
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