Cleanup: update ifdef wrapper name
[babeltrace.git] / lib / context.c
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.
20 */
21
22 #include <babeltrace/babeltrace.h>
23 #include <babeltrace/context.h>
24 #include <babeltrace/context-internal.h>
25 #include <babeltrace/trace-handle.h>
26 #include <babeltrace/trace-handle-internal.h>
27 #include <babeltrace/trace-collection.h>
28 #include <babeltrace/format.h>
29 #include <babeltrace/babeltrace-internal.h>
30 #include <stdlib.h>
31 #include <string.h>
32 #include <assert.h>
33 #include <errno.h>
34
35 #include <fts.h>
36 #include <fcntl.h> /* For O_RDONLY */
37
38 #include <glib.h>
39
40 struct bt_context *bt_context_create(void)
41 {
42 struct bt_context *ctx;
43
44 ctx = g_new0(struct bt_context, 1);
45 ctx->refcount = 1;
46 /* Negative handle id are errors. */
47 ctx->last_trace_handle_id = 0;
48
49 /* Instanciate the trace handle container */
50 ctx->trace_handles = g_hash_table_new_full(g_direct_hash,
51 g_direct_equal, NULL,
52 (GDestroyNotify) bt_trace_handle_destroy);
53
54 ctx->current_iterator = NULL;
55 ctx->tc = g_new0(struct trace_collection, 1);
56 init_trace_collection(ctx->tc);
57
58 return ctx;
59 }
60
61 int bt_context_add_trace(struct bt_context *ctx, const char *path,
62 const char *format_name,
63 void (*packet_seek)(struct stream_pos *pos, size_t index,
64 int whence),
65 struct mmap_stream_list *stream_list,
66 FILE *metadata)
67 {
68 struct trace_descriptor *td;
69 struct format *fmt;
70 struct bt_trace_handle *handle;
71 int ret;
72
73 if (!ctx || !format_name || (!path && !stream_list))
74 return -EINVAL;
75
76 fmt = bt_lookup_format(g_quark_from_string(format_name));
77 if (!fmt) {
78 fprintf(stderr, "[error] [Context] Format \"%s\" unknown.\n\n",
79 format_name);
80 ret = -1;
81 goto end;
82 }
83 if (path) {
84 td = fmt->open_trace(path, O_RDONLY, packet_seek, NULL);
85 if (!td) {
86 fprintf(stderr, "[warning] [Context] Cannot open_trace of the format %s .\n\n",
87 path);
88 ret = -1;
89 goto end;
90 }
91 } else {
92 td = fmt->open_mmap_trace(stream_list, packet_seek, metadata);
93 if (!td) {
94 fprintf(stderr, "[error] [Context] Cannot open_trace of the format %s .\n\n",
95 path);
96 ret = -1;
97 goto end;
98 }
99 }
100
101 /* Create an handle for the trace */
102 handle = bt_trace_handle_create(ctx);
103 if (handle < 0) {
104 fprintf(stderr, "[error] [Context] Creating trace handle %s .\n\n",
105 path);
106 ret = -1;
107 goto end;
108 }
109 handle->format = fmt;
110 handle->td = td;
111 if (path) {
112 strncpy(handle->path, path, PATH_MAX);
113 handle->path[PATH_MAX - 1] = '\0';
114 }
115
116 if (fmt->set_handle)
117 fmt->set_handle(td, handle);
118 if (fmt->set_context)
119 fmt->set_context(td, ctx);
120
121 /* Add new handle to container */
122 g_hash_table_insert(ctx->trace_handles,
123 (gpointer) (unsigned long) handle->id,
124 handle);
125 ret = trace_collection_add(ctx->tc, td);
126 if (ret != 0)
127 goto end;
128
129 ret = fmt->convert_index_timestamp(td);
130 if (ret < 0)
131 goto end;
132
133 handle->real_timestamp_begin = fmt->timestamp_begin(td, handle, BT_CLOCK_REAL);
134 handle->real_timestamp_end = fmt->timestamp_end(td, handle, BT_CLOCK_REAL);
135 handle->cycles_timestamp_begin = fmt->timestamp_begin(td, handle, BT_CLOCK_CYCLES);
136 handle->cycles_timestamp_end = fmt->timestamp_end(td, handle, BT_CLOCK_CYCLES);
137
138 return handle->id;
139 end:
140 return ret;
141 }
142
143 int bt_context_remove_trace(struct bt_context *ctx, int handle_id)
144 {
145 struct bt_trace_handle *handle;
146
147 if (!ctx)
148 return -EINVAL;
149
150 handle = g_hash_table_lookup(ctx->trace_handles,
151 (gpointer) (unsigned long) handle_id);
152 if (!handle)
153 return -ENOENT;
154
155 /* Remove from containers */
156 trace_collection_remove(ctx->tc, handle->td);
157 /* Close the trace */
158 handle->format->close_trace(handle->td);
159
160 /* Remove and free the handle */
161 g_hash_table_remove(ctx->trace_handles,
162 (gpointer) (unsigned long) handle_id);
163 return 0;
164 }
165
166 static
167 void bt_context_destroy(struct bt_context *ctx)
168 {
169 assert(ctx);
170 finalize_trace_collection(ctx->tc);
171
172 /* Remote all traces. The g_hash_table_destroy will call
173 * bt_trace_handle_destroy on each elements.
174 */
175 g_hash_table_destroy(ctx->trace_handles);
176
177 /* ctx->tc should always be valid */
178 assert(ctx->tc != NULL);
179 g_free(ctx->tc);
180 g_free(ctx);
181 }
182
183 void bt_context_get(struct bt_context *ctx)
184 {
185 assert(ctx);
186 ctx->refcount++;
187 }
188
189 void bt_context_put(struct bt_context *ctx)
190 {
191 assert(ctx);
192 ctx->refcount--;
193 if (ctx->refcount == 0)
194 bt_context_destroy(ctx);
195 }
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