1 #ifndef BABELTRACE_CTF_WRITER_WRITER_H
2 #define BABELTRACE_CTF_WRITER_WRITER_H
5 * BabelTrace - CTF Writer: Writer
7 * Copyright 2013, 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com>
9 * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com>
11 * Permission is hereby granted, free of charge, to any person obtaining a copy
12 * of this software and associated documentation files (the "Software"), to deal
13 * in the Software without restriction, including without limitation the rights
14 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
15 * copies of the Software, and to permit persons to whom the Software is
16 * furnished to do so, subject to the following conditions:
18 * The above copyright notice and this permission notice shall be included in
19 * all copies or substantial portions of the Software.
21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
22 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
24 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
25 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
26 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
29 * The Common Trace Format (CTF) Specification is available at
30 * http://www.efficios.com/ctf
33 #include <babeltrace/ctf-ir/event-types.h>
34 #include <babeltrace/ctf-ir/trace.h>
42 struct bt_ctf_stream_class
;
46 * bt_ctf_writer_create: create a writer instance.
48 * Allocate a new writer that will produce a trace in the given path.
49 * The creation of a writer sets its reference count to 1.
51 * @param path Path to the trace's containing folder (string is copied).
53 * Returns an allocated writer on success, NULL on error.
55 extern struct bt_ctf_writer
*bt_ctf_writer_create(const char *path
);
58 * bt_ctf_writer_get_trace: Get a writer's associated trace.
60 * @param writer Writer instance.
62 * Return the writer's associated instance, NULL on error.
64 extern struct bt_ctf_trace
*bt_ctf_writer_get_trace(
65 struct bt_ctf_writer
*writer
);
68 * bt_ctf_writer_create_stream: create a stream instance.
70 * Allocate a new stream instance and register it to the writer. The creation of
71 * a stream sets its reference count to 1.
73 * @param writer Writer instance.
74 * @param stream_class Stream class to instantiate.
76 * Returns an allocated stream on success, NULL on error.
78 extern struct bt_ctf_stream
*bt_ctf_writer_create_stream(
79 struct bt_ctf_writer
*writer
,
80 struct bt_ctf_stream_class
*stream_class
);
83 * bt_ctf_writer_add_environment_field: add an environment field to the trace.
85 * Add an environment field to the trace. The name and value parameters are
88 * @param writer Writer instance.
89 * @param name Name of the environment field (will be copied).
90 * @param value Value of the environment field (will be copied).
92 * Returns 0 on success, a negative value on error.
94 extern int bt_ctf_writer_add_environment_field(struct bt_ctf_writer
*writer
,
99 * bt_ctf_writer_add_clock: add a clock to the trace.
101 * Add a clock to the trace. Clocks assigned to stream classes must be
102 * registered to the writer.
104 * @param writer Writer instance.
105 * @param clock Clock to add to the trace.
107 * Returns 0 on success, a negative value on error.
109 extern int bt_ctf_writer_add_clock(struct bt_ctf_writer
*writer
,
110 struct bt_ctf_clock
*clock
);
113 * bt_ctf_writer_get_metadata_string: get meta-data string.
115 * Get the trace's TSDL meta-data. The caller assumes the ownership of the
118 * @param writer Writer instance.
120 * Returns the metadata string on success, NULL on error.
122 extern char *bt_ctf_writer_get_metadata_string(struct bt_ctf_writer
*writer
);
125 * bt_ctf_writer_flush_metadata: flush the trace's metadata to disk.
127 * Flush the trace's metadata to the metadata file. Note that the metadata will
128 * be flushed automatically when the Writer instance is released (last call to
129 * bt_ctf_writer_put).
131 * @param writer Writer instance.
133 extern void bt_ctf_writer_flush_metadata(struct bt_ctf_writer
*writer
);
136 * bt_ctf_writer_set_byte_order: set a field type's byte order.
138 * Set the trace's byte order. Defaults to the host machine's endianness.
140 * @param writer Writer instance.
141 * @param byte_order Trace's byte order.
143 * Returns 0 on success, a negative value on error.
145 * Note: byte_order must not be BT_CTF_BYTE_ORDER_NATIVE since, according
146 * to the CTF specification, is defined as "the byte order described in the
147 * trace description".
149 extern int bt_ctf_writer_set_byte_order(struct bt_ctf_writer
*writer
,
150 enum bt_ctf_byte_order byte_order
);
153 * bt_ctf_writer_get and bt_ctf_writer_put: increment and decrement the
154 * writer's reference count.
156 * These functions ensure that the writer won't be destroyed while it
157 * is in use. The same number of get and put (plus one extra put to
158 * release the initial reference done at creation) have to be done to
161 * When the writer's reference count is decremented to 0 by a
162 * bt_ctf_writer_put, the writer is freed.
164 * @param writer Writer instance.
166 extern void bt_ctf_writer_get(struct bt_ctf_writer
*writer
);
167 extern void bt_ctf_writer_put(struct bt_ctf_writer
*writer
);
173 #endif /* BABELTRACE_CTF_WRITER_WRITER_H */