Fix enabled state when listing UST events
[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 unsigned int enabled;
47 struct lttng_ust_event attr;
48 struct cds_lfht *ctx;
49 struct cds_lfht_node node;
50 };
51
52 /* UST stream */
53 struct ltt_ust_stream {
54 int handle;
55 char pathname[PATH_MAX];
56 struct lttng_ust_object_data *obj;
57 /* Using a list of streams to keep order. */
58 struct cds_list_head list;
59 };
60
61 /* UST channel */
62 struct ltt_ust_channel {
63 unsigned int enabled;
64 char name[LTTNG_UST_SYM_NAME_LEN];
65 char pathname[PATH_MAX];
66 struct lttng_ust_channel attr;
67 struct cds_lfht *ctx;
68 struct cds_lfht *events;
69 struct cds_lfht_node node;
70 };
71
72 /* UST Metadata */
73 struct ltt_ust_metadata {
74 int handle;
75 struct lttng_ust_object_data *obj;
76 char pathname[PATH_MAX]; /* Trace file path name */
77 struct lttng_ust_channel attr;
78 struct lttng_ust_object_data *stream_obj;
79 };
80
81 /* UST domain global (LTTNG_DOMAIN_UST) */
82 struct ltt_ust_domain_global {
83 struct cds_lfht *channels;
84 };
85
86 /* UST domain pid (LTTNG_DOMAIN_UST_PID) */
87 struct ltt_ust_domain_pid {
88 pid_t pid;
89 struct cds_lfht *channels;
90 struct cds_lfht_node node;
91 };
92
93 /* UST domain exec name (LTTNG_DOMAIN_UST_EXEC_NAME) */
94 struct ltt_ust_domain_exec {
95 char exec_name[LTTNG_UST_SYM_NAME_LEN];
96 struct cds_lfht *channels;
97 struct cds_lfht_node node;
98 };
99
100 /* UST session */
101 struct ltt_ust_session {
102 int uid; /* Unique identifier of session */
103 int consumer_fds_sent;
104 int consumer_fd;
105 int start_trace;
106 char pathname[PATH_MAX];
107 struct ltt_ust_domain_global domain_global;
108 /*
109 * Those two hash tables contains data for a specific UST domain and each
110 * contains a HT of channels. See ltt_ust_domain_exec and
111 * ltt_ust_domain_pid data structures.
112 */
113 struct cds_lfht *domain_pid;
114 struct cds_lfht *domain_exec;
115 };
116
117 #ifdef HAVE_LIBLTTNG_UST_CTL
118
119 /*
120 * Lookup functions. NULL is returned if not found.
121 */
122 struct ltt_ust_event *trace_ust_find_event_by_name(struct cds_lfht *ht,
123 char *name);
124 struct ltt_ust_channel *trace_ust_find_channel_by_name(struct cds_lfht *ht,
125 char *name);
126
127 /*
128 * Create functions malloc() the data structure.
129 */
130 struct ltt_ust_session *trace_ust_create_session(char *path, unsigned int uid,
131 struct lttng_domain *domain);
132 struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *attr,
133 char *path);
134 struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev);
135 struct ltt_ust_metadata *trace_ust_create_metadata(char *path);
136
137 /*
138 * Destroy functions free() the data structure and remove from linked list if
139 * it's applies.
140 */
141 void trace_ust_destroy_session(struct ltt_ust_session *session);
142 void trace_ust_destroy_metadata(struct ltt_ust_metadata *metadata);
143 void trace_ust_destroy_channel(struct ltt_ust_channel *channel);
144 void trace_ust_destroy_event(struct ltt_ust_event *event);
145
146 #else /* HAVE_LIBLTTNG_UST_CTL */
147
148 static inline
149 struct ltt_ust_event *trace_ust_find_event_by_name(struct cds_lfht *ht,
150 char *name)
151 {
152 return NULL;
153 }
154
155 static inline
156 struct ltt_ust_channel *trace_ust_find_channel_by_name(struct cds_lfht *ht,
157 char *name)
158 {
159 return NULL;
160 }
161
162 static inline
163 struct ltt_ust_session *trace_ust_create_session(char *path, pid_t pid,
164 struct lttng_domain *domain)
165 {
166 return NULL;
167 }
168 static inline
169 struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *attr,
170 char *path)
171 {
172 return NULL;
173 }
174 static inline
175 struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev)
176 {
177 return NULL;
178 }
179 static inline
180 struct ltt_ust_metadata *trace_ust_create_metadata(char *path)
181 {
182 return NULL;
183 }
184
185 static inline
186 void trace_ust_destroy_session(struct ltt_ust_session *session)
187 {
188 }
189
190 static inline
191 void trace_ust_destroy_metadata(struct ltt_ust_metadata *metadata)
192 {
193 }
194
195 static inline
196 void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
197 {
198 }
199
200 static inline
201 void trace_ust_destroy_event(struct ltt_ust_event *event)
202 {
203 }
204
205 #endif /* HAVE_LIBLTTNG_UST_CTL */
206
207 #endif /* _LTT_TRACE_UST_H */
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