Tests: Fix sleep interruption in health stall test
[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 };
69
70 /* Metadata */
71 struct ltt_kernel_metadata {
72 int fd;
73 struct lttng_channel *conf;
74 };
75
76 /* Channel stream */
77 struct ltt_kernel_stream {
78 int fd;
79 int state;
80 /* Format is %s_%d respectively channel name and CPU number. */
81 char name[DEFAULT_STREAM_NAME_LEN];
82 struct cds_list_head list;
83 };
84
85 /* Kernel session */
86 struct ltt_kernel_session {
87 int fd;
88 int metadata_stream_fd;
89 int consumer_fds_sent;
90 unsigned int channel_count;
91 unsigned int stream_count_global;
92 char *trace_path;
93 struct ltt_kernel_metadata *metadata;
94 struct ltt_kernel_channel_list channel_list;
95 /* UID/GID of the user owning the session */
96 uid_t uid;
97 gid_t gid;
98 /*
99 * Two consumer_output object are needed where one is needed for the
100 * current output object and the second one is the temporary object used to
101 * store URI being set by the lttng_set_consumer_uri call. Once
102 * lttng_enable_consumer is called, the two pointers are swapped.
103 */
104 struct consumer_output *consumer;
105 struct consumer_output *tmp_consumer;
106 /* Tracing session id */
107 unsigned int id;
108 /* Session is started and active */
109 unsigned int started;
110 };
111
112 /*
113 * Lookup functions. NULL is returned if not found.
114 */
115 struct ltt_kernel_event *trace_kernel_get_event_by_name(
116 char *name, struct ltt_kernel_channel *channel);
117 struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
118 char *name, struct ltt_kernel_session *session);
119
120 /*
121 * Create functions malloc() the data structure.
122 */
123 struct ltt_kernel_session *trace_kernel_create_session(char *path);
124 struct ltt_kernel_channel *trace_kernel_create_channel(struct lttng_channel *chan, char *path);
125 struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev);
126 struct ltt_kernel_metadata *trace_kernel_create_metadata(void);
127 struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
128 unsigned int count);
129
130 /*
131 * Destroy functions free() the data structure and remove from linked list if
132 * it's applies.
133 */
134 void trace_kernel_destroy_session(struct ltt_kernel_session *session);
135 void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata);
136 void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel);
137 void trace_kernel_destroy_event(struct ltt_kernel_event *event);
138 void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream);
139
140 #endif /* _LTT_TRACE_KERNEL_H */
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