Add missing rcu_read_unlock on error paths
[lttng-tools.git] / include / lttng / lttng-ustconsumer.h
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1/*
2 * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
3 * Copyright (C) 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; only version 2
8 * of the License.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 */
19
20#ifndef _LTTNG_USTCONSUMER_H
21#define _LTTNG_USTCONSUMER_H
22
23#include <config.h>
24#include <lttng/lttng-consumer.h>
25#include <errno.h>
26
74d0b642 27#ifdef HAVE_LIBLTTNG_UST_CTL
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28
29/*
30 * Mmap the ring buffer, read it and write the data to the tracefile.
31 *
32 * Returns the number of bytes written.
33 */
34extern int lttng_ustconsumer_on_read_subbuffer_mmap(
35 struct lttng_consumer_local_data *ctx,
36 struct lttng_consumer_stream *stream, unsigned long len);
37
38/* Not implemented */
39extern int lttng_ustconsumer_on_read_subbuffer_splice(
40 struct lttng_consumer_local_data *ctx,
41 struct lttng_consumer_stream *stream, unsigned long len);
42
43/*
44 * Take a snapshot for a specific fd
45 *
46 * Returns 0 on success, < 0 on error
47 */
48int lttng_ustconsumer_take_snapshot(struct lttng_consumer_local_data *ctx,
49 struct lttng_consumer_stream *stream);
50
51/*
52 * Get the produced position
53 *
54 * Returns 0 on success, < 0 on error
55 */
56int lttng_ustconsumer_get_produced_snapshot(
57 struct lttng_consumer_local_data *ctx,
58 struct lttng_consumer_stream *stream,
59 unsigned long *pos);
60
61int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx,
62 int sock, struct pollfd *consumer_sockpoll);
63
64extern int lttng_ustconsumer_allocate_channel(struct lttng_consumer_channel *chan);
65extern void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan);
66extern int lttng_ustconsumer_allocate_stream(struct lttng_consumer_stream *stream);
67extern void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream);
68
74d0b642 69#else /* HAVE_LIBLTTNG_UST_CTL */
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70
71static inline
72int lttng_ustconsumer_on_read_subbuffer_mmap(
73 struct lttng_consumer_local_data *ctx,
74 struct lttng_consumer_stream *stream, unsigned long len)
75{
76 return -ENOSYS;
77}
78
79static inline
80int lttng_ustconsumer_on_read_subbuffer_splice(
81 struct lttng_consumer_local_data *ctx,
82 struct lttng_consumer_stream *uststream, unsigned long len)
83{
84 return -ENOSYS;
85}
86
87static inline
88int lttng_ustconsumer_take_snapshot(struct lttng_consumer_local_data *ctx,
89 struct lttng_consumer_stream *stream)
90{
91 return -ENOSYS;
92}
93
94static inline
95int lttng_ustconsumer_get_produced_snapshot(
96 struct lttng_consumer_local_data *ctx,
97 struct lttng_consumer_stream *stream,
98 unsigned long *pos)
99{
100 return -ENOSYS;
101}
102
103static inline
104int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx,
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105 int sock, struct pollfd *consumer_sockpoll)
106{
107 return -ENOSYS;
108}
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109
110static inline
111int lttng_ustconsumer_allocate_channel(struct lttng_consumer_channel *chan)
112{
113 return -ENOSYS;
114}
115
116static inline
117void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan)
118{
119}
120
121static inline
122int lttng_ustconsumer_allocate_stream(struct lttng_consumer_stream *stream)
123{
124 return -ENOSYS;
125}
126
127static inline
128void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream)
129{
130}
131
74d0b642 132#endif /* HAVE_LIBLTTNG_UST_CTL */
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133
134#endif /* _LTTNG_USTCONSUMER_H */
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