Add internal kernel channel destroy function
[lttng-tools.git] / src / bin / lttng-sessiond / trace-kernel.h
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
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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.
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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 *
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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.
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16 */
17
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18#ifndef _LTT_TRACE_KERNEL_H
19#define _LTT_TRACE_KERNEL_H
fda89c9b 20
9e78d6ae 21#include <urcu/list.h>
d4a2a84a 22
f3ed775e 23#include <lttng/lttng.h>
10a8a223 24#include <common/lttng-kernel.h>
4dbc372b 25#include <common/lttng-kernel-old.h>
ce2a9e76 26#include <common/defaults.h>
54012638 27
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28#include "consumer.h"
29
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30/* Kernel event list */
31struct ltt_kernel_event_list {
32 struct cds_list_head head;
33};
34
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35/* Channel stream list */
36struct ltt_kernel_stream_list {
37 struct cds_list_head head;
38};
39
40/* Channel list */
41struct ltt_kernel_channel_list {
42 struct cds_list_head head;
43};
44
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45/* Kernel event */
46struct ltt_kernel_event {
20fe2104 47 int fd;
e953ef25 48 int enabled;
f34daff7 49 struct lttng_kernel_event *event;
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50 struct cds_list_head list;
51};
52
53/* Kernel channel */
54struct ltt_kernel_channel {
55 int fd;
d36b8583 56 int enabled;
8c0faa1d 57 unsigned int stream_count;
cbbbb275 58 unsigned int event_count;
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59 /*
60 * TODO: need internal representation to support more than a
61 * single context.
62 */
d65106b1 63 struct lttng_kernel_context *ctx;
f3ed775e 64 struct lttng_channel *channel;
20fe2104 65 struct ltt_kernel_event_list events_list;
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66 struct ltt_kernel_stream_list stream_list;
67 struct cds_list_head list;
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68 /* Session pointer which has a reference to this object. */
69 struct ltt_kernel_session *session;
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70};
71
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72/* Metadata */
73struct ltt_kernel_metadata {
74 int fd;
f3ed775e 75 struct lttng_channel *conf;
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76};
77
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78/* Channel stream */
79struct ltt_kernel_stream {
80 int fd;
8c0faa1d 81 int state;
00e2e675 82 /* Format is %s_%d respectively channel name and CPU number. */
ce2a9e76 83 char name[DEFAULT_STREAM_NAME_LEN];
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84 struct cds_list_head list;
85};
86
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87/* Kernel session */
88struct ltt_kernel_session {
89 int fd;
8c0faa1d 90 int metadata_stream_fd;
3bd1e081 91 int consumer_fds_sent;
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92 unsigned int channel_count;
93 unsigned int stream_count_global;
63053e7c 94 char *trace_path;
aaf26714 95 struct ltt_kernel_metadata *metadata;
8c0faa1d 96 struct ltt_kernel_channel_list channel_list;
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97 /* UID/GID of the user owning the session */
98 uid_t uid;
99 gid_t gid;
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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;
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108 /* Tracing session id */
109 unsigned int id;
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110 /* Session is started and active */
111 unsigned int started;
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112};
113
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114/*
115 * Lookup functions. NULL is returned if not found.
116 */
117struct ltt_kernel_event *trace_kernel_get_event_by_name(
19e70852 118 char *name, struct ltt_kernel_channel *channel);
62499ad6 119struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
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120 char *name, struct ltt_kernel_session *session);
121
54012638 122/*
c363b55d 123 * Create functions malloc() the data structure.
54012638 124 */
f9815039 125struct ltt_kernel_session *trace_kernel_create_session(char *path);
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126struct ltt_kernel_channel *trace_kernel_create_channel(struct lttng_channel *chan, char *path);
127struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev);
a4b92340 128struct ltt_kernel_metadata *trace_kernel_create_metadata(void);
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129struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
130 unsigned int count);
54012638 131
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132/*
133 * Destroy functions free() the data structure and remove from linked list if
134 * it's applies.
135 */
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136void trace_kernel_destroy_session(struct ltt_kernel_session *session);
137void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata);
138void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel);
139void trace_kernel_destroy_event(struct ltt_kernel_event *event);
140void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream);
c363b55d 141
62499ad6 142#endif /* _LTT_TRACE_KERNEL_H */
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