gcc warning fix: -Wextra
[babeltrace.git] / lib / context.c
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1/*
2 * context.c
3 *
4 * Babeltrace Library
5 *
6 * Copyright 2011-2012 EfficiOS Inc. and Linux Foundation
7 *
8 * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 * Julien Desfossez <julien.desfossez@efficios.com>
10 *
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:
17 *
18 * The above copyright notice and this permission notice shall be included in
19 * all copies or substantial portions of the Software.
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20 *
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
27 * SOFTWARE.
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28 */
29
30#include <babeltrace/babeltrace.h>
31#include <babeltrace/context.h>
08c22d05 32#include <babeltrace/context-internal.h>
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33#include <babeltrace/trace-handle.h>
34#include <babeltrace/trace-handle-internal.h>
35#include <babeltrace/trace-collection.h>
36#include <babeltrace/format.h>
e1d01c39 37#include <babeltrace/babeltrace-internal.h>
b469d2dd 38#include <stdlib.h>
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39#include <string.h>
40#include <assert.h>
7f89ddce 41#include <errno.h>
b469d2dd 42
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43#include <fcntl.h> /* For O_RDONLY */
44
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45#include <glib.h>
46
47struct bt_context *bt_context_create(void)
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48{
49 struct bt_context *ctx;
50
6cba487f 51 ctx = g_new0(struct bt_context, 1);
b469d2dd 52 ctx->refcount = 1;
6cba487f 53 /* Negative handle id are errors. */
842c2b97 54 ctx->last_trace_handle_id = 0;
b469d2dd 55
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56 /* Instanciate the trace handle container */
57 ctx->trace_handles = g_hash_table_new_full(g_direct_hash,
58 g_direct_equal, NULL,
59 (GDestroyNotify) bt_trace_handle_destroy);
60
e003e871 61 ctx->current_iterator = NULL;
6cba487f 62 ctx->tc = g_new0(struct trace_collection, 1);
2552c374 63 bt_init_trace_collection(ctx->tc);
6cba487f 64
b469d2dd 65 return ctx;
6cba487f 66}
b469d2dd 67
6cba487f 68int bt_context_add_trace(struct bt_context *ctx, const char *path,
613f532b 69 const char *format_name,
1cf393f6 70 void (*packet_seek)(struct bt_stream_pos *pos, size_t index,
0d4c669f 71 int whence),
c150f912 72 struct bt_mmap_stream_list *stream_list,
0d4c669f 73 FILE *metadata)
6cba487f 74{
1b8455b7 75 struct bt_trace_descriptor *td;
37b99bdb 76 struct bt_format *fmt;
6cba487f 77 struct bt_trace_handle *handle;
f824ae04 78 int ret, closeret;
6cba487f 79
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80 if (!ctx || !format_name || (!path && !stream_list))
81 return -EINVAL;
82
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83 fmt = bt_lookup_format(g_quark_from_string(format_name));
84 if (!fmt) {
85 fprintf(stderr, "[error] [Context] Format \"%s\" unknown.\n\n",
86 format_name);
87 ret = -1;
88 goto end;
89 }
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90 if (path) {
91 td = fmt->open_trace(path, O_RDONLY, packet_seek, NULL);
92 if (!td) {
abc40d24 93 fprintf(stderr, "[warning] [Context] Cannot open_trace of format %s at path %s.\n",
0d575aea 94 format_name, path);
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95 ret = -1;
96 goto end;
97 }
98 } else {
99 td = fmt->open_mmap_trace(stream_list, packet_seek, metadata);
100 if (!td) {
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101 fprintf(stderr, "[error] [Context] Cannot open_mmap_trace of format %s.\n\n",
102 format_name);
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103 ret = -1;
104 goto end;
105 }
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106 }
107
108 /* Create an handle for the trace */
109 handle = bt_trace_handle_create(ctx);
642871ed 110 if (!handle) {
02dc4610 111 fprintf(stderr, "[error] [Context] Creating trace handle %s .\n\n",
6cba487f 112 path);
1059a2bf 113 ret = -1;
e6d85e38 114 goto error;
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115 }
116 handle->format = fmt;
117 handle->td = td;
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118 if (path) {
119 strncpy(handle->path, path, PATH_MAX);
120 handle->path[PATH_MAX - 1] = '\0';
121 }
6cba487f 122
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123 if (fmt->set_handle)
124 fmt->set_handle(td, handle);
125 if (fmt->set_context)
126 fmt->set_context(td, ctx);
127
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128 /* Add new handle to container */
129 g_hash_table_insert(ctx->trace_handles,
130 (gpointer) (unsigned long) handle->id,
131 handle);
2552c374 132 ret = bt_trace_collection_add(ctx->tc, td);
03798a93 133 if (ret != 0)
e6d85e38 134 goto error;
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135
136 ret = fmt->convert_index_timestamp(td);
137 if (ret < 0)
e6d85e38 138 goto error;
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139
140 handle->real_timestamp_begin = fmt->timestamp_begin(td, handle, BT_CLOCK_REAL);
141 handle->real_timestamp_end = fmt->timestamp_end(td, handle, BT_CLOCK_REAL);
142 handle->cycles_timestamp_begin = fmt->timestamp_begin(td, handle, BT_CLOCK_CYCLES);
143 handle->cycles_timestamp_end = fmt->timestamp_end(td, handle, BT_CLOCK_CYCLES);
144
145 return handle->id;
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146
147error:
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148 closeret = fmt->close_trace(td);
149 if (closeret) {
150 fprintf(stderr, "Error in close_trace callback\n");
151 }
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152end:
153 return ret;
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154}
155
7f89ddce 156int bt_context_remove_trace(struct bt_context *ctx, int handle_id)
b469d2dd 157{
6cba487f 158 struct bt_trace_handle *handle;
f824ae04 159 int ret;
6cba487f 160
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161 if (!ctx)
162 return -EINVAL;
163
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164 handle = g_hash_table_lookup(ctx->trace_handles,
165 (gpointer) (unsigned long) handle_id);
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166 if (!handle)
167 return -ENOENT;
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168
169 /* Remove from containers */
2552c374 170 bt_trace_collection_remove(ctx->tc, handle->td);
6cba487f 171 /* Close the trace */
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172 ret = handle->format->close_trace(handle->td);
173 if (ret) {
174 fprintf(stderr, "Error in close_trace callback\n");
175 return ret;
176 }
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177 /* Remove and free the handle */
178 g_hash_table_remove(ctx->trace_handles,
179 (gpointer) (unsigned long) handle_id);
7f89ddce 180 return 0;
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181}
182
183static
184void bt_context_destroy(struct bt_context *ctx)
185{
7f89ddce 186 assert(ctx);
2552c374 187 bt_finalize_trace_collection(ctx->tc);
6cba487f 188
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189 /*
190 * Remove all traces. The g_hash_table_destroy will call
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191 * bt_trace_handle_destroy on each elements.
192 */
193 g_hash_table_destroy(ctx->trace_handles);
194
195 /* ctx->tc should always be valid */
196 assert(ctx->tc != NULL);
197 g_free(ctx->tc);
198 g_free(ctx);
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199}
200
6cba487f 201void bt_context_get(struct bt_context *ctx)
b469d2dd 202{
7f89ddce 203 assert(ctx);
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204 ctx->refcount++;
205}
b469d2dd 206
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207void bt_context_put(struct bt_context *ctx)
208{
7f89ddce 209 assert(ctx);
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210 ctx->refcount--;
211 if (ctx->refcount == 0)
6cba487f 212 bt_context_destroy(ctx);
b469d2dd 213}
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