Add internal kernel channel destroy function
[lttng-tools.git] / src / bin / lttng-sessiond / trace-kernel.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 modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18 #ifndef _LTT_TRACE_KERNEL_H
19 #define _LTT_TRACE_KERNEL_H
20
21 #include <urcu/list.h>
22
23 #include <lttng/lttng.h>
24 #include <common/lttng-kernel.h>
25 #include <common/lttng-kernel-old.h>
26 #include <common/defaults.h>
27
28 #include "consumer.h"
29
30 /* Kernel event list */
31 struct ltt_kernel_event_list {
32 struct cds_list_head head;
33 };
34
35 /* Channel stream list */
36 struct ltt_kernel_stream_list {
37 struct cds_list_head head;
38 };
39
40 /* Channel list */
41 struct ltt_kernel_channel_list {
42 struct cds_list_head head;
43 };
44
45 /* Kernel event */
46 struct ltt_kernel_event {
47 int fd;
48 int enabled;
49 struct lttng_kernel_event *event;
50 struct cds_list_head list;
51 };
52
53 /* Kernel channel */
54 struct ltt_kernel_channel {
55 int fd;
56 int enabled;
57 unsigned int stream_count;
58 unsigned int event_count;
59 /*
60 * TODO: need internal representation to support more than a
61 * single context.
62 */
63 struct lttng_kernel_context *ctx;
64 struct lttng_channel *channel;
65 struct ltt_kernel_event_list events_list;
66 struct ltt_kernel_stream_list stream_list;
67 struct cds_list_head list;
68 /* Session pointer which has a reference to this object. */
69 struct ltt_kernel_session *session;
70 };
71
72 /* Metadata */
73 struct ltt_kernel_metadata {
74 int fd;
75 struct lttng_channel *conf;
76 };
77
78 /* Channel stream */
79 struct ltt_kernel_stream {
80 int fd;
81 int state;
82 /* Format is %s_%d respectively channel name and CPU number. */
83 char name[DEFAULT_STREAM_NAME_LEN];
84 struct cds_list_head list;
85 };
86
87 /* Kernel session */
88 struct ltt_kernel_session {
89 int fd;
90 int metadata_stream_fd;
91 int consumer_fds_sent;
92 unsigned int channel_count;
93 unsigned int stream_count_global;
94 char *trace_path;
95 struct ltt_kernel_metadata *metadata;
96 struct ltt_kernel_channel_list channel_list;
97 /* UID/GID of the user owning the session */
98 uid_t uid;
99 gid_t gid;
100 /*
101 * Two consumer_output object are needed where one is needed for the
102 * current output object and the second one is the temporary object used to
103 * store URI being set by the lttng_set_consumer_uri call. Once
104 * lttng_enable_consumer is called, the two pointers are swapped.
105 */
106 struct consumer_output *consumer;
107 struct consumer_output *tmp_consumer;
108 /* Tracing session id */
109 unsigned int id;
110 /* Session is started and active */
111 unsigned int started;
112 };
113
114 /*
115 * Lookup functions. NULL is returned if not found.
116 */
117 struct ltt_kernel_event *trace_kernel_get_event_by_name(
118 char *name, struct ltt_kernel_channel *channel);
119 struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
120 char *name, struct ltt_kernel_session *session);
121
122 /*
123 * Create functions malloc() the data structure.
124 */
125 struct ltt_kernel_session *trace_kernel_create_session(char *path);
126 struct ltt_kernel_channel *trace_kernel_create_channel(struct lttng_channel *chan, char *path);
127 struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev);
128 struct ltt_kernel_metadata *trace_kernel_create_metadata(void);
129 struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
130 unsigned int count);
131
132 /*
133 * Destroy functions free() the data structure and remove from linked list if
134 * it's applies.
135 */
136 void trace_kernel_destroy_session(struct ltt_kernel_session *session);
137 void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata);
138 void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel);
139 void trace_kernel_destroy_event(struct ltt_kernel_event *event);
140 void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream);
141
142 #endif /* _LTT_TRACE_KERNEL_H */
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