fix manpage: refer to lttng(1)
[babeltrace.git] / lib / context.c
CommitLineData
b469d2dd
JD
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>
08c22d05 24#include <babeltrace/context-internal.h>
6cba487f
MD
25#include <babeltrace/trace-handle.h>
26#include <babeltrace/trace-handle-internal.h>
27#include <babeltrace/trace-collection.h>
28#include <babeltrace/format.h>
b469d2dd
JD
29#include <stdlib.h>
30
6cba487f
MD
31#include <fts.h>
32#include <fcntl.h> /* For O_RDONLY */
33
34/* TODO ybrosseau: should be hidden in the CTF format */
35#include <babeltrace/ctf/types.h> /* for ctf_move_pos_slow */
36
37#include <glib.h>
38
39struct bt_context *bt_context_create(void)
b469d2dd
JD
40{
41 struct bt_context *ctx;
42
6cba487f 43 ctx = g_new0(struct bt_context, 1);
b469d2dd 44 ctx->refcount = 1;
6cba487f 45 /* Negative handle id are errors. */
842c2b97 46 ctx->last_trace_handle_id = 0;
b469d2dd 47
6cba487f
MD
48 /* Instanciate the trace handle container */
49 ctx->trace_handles = g_hash_table_new_full(g_direct_hash,
50 g_direct_equal, NULL,
51 (GDestroyNotify) bt_trace_handle_destroy);
52
53 ctx->tc = g_new0(struct trace_collection, 1);
54 init_trace_collection(ctx->tc);
55
b469d2dd 56 return ctx;
6cba487f 57}
b469d2dd 58
6cba487f
MD
59int bt_context_add_trace(struct bt_context *ctx, const char *path,
60 const char *format_str)
61{
62 struct trace_descriptor *td;
63 struct format *fmt;
64 struct bt_trace_handle *handle;
65
66 fmt = bt_lookup_format(g_quark_from_string(format_str));
67 td = fmt->open_trace(path, O_RDONLY,
68 ctf_move_pos_slow, NULL);
69 if (!td) {
02dc4610 70 fprintf(stderr, "[error] [Context] Cannot open_trace of the format %s .\n\n",
6cba487f 71 path);
e669e45e 72 return -1;
6cba487f
MD
73 }
74
75 /* Create an handle for the trace */
76 handle = bt_trace_handle_create(ctx);
77 if (handle < 0) {
02dc4610 78 fprintf(stderr, "[error] [Context] Creating trace handle %s .\n\n",
6cba487f 79 path);
e669e45e 80 return -1;
6cba487f
MD
81 }
82 handle->format = fmt;
83 handle->td = td;
84 strncpy(handle->path, path, PATH_MAX);
85 handle->path[PATH_MAX - 1] = '\0';
86
87 /* Add new handle to container */
88 g_hash_table_insert(ctx->trace_handles,
89 (gpointer) (unsigned long) handle->id,
90 handle);
02dc4610 91 return trace_collection_add(ctx->tc, td);
b469d2dd
JD
92}
93
6cba487f 94void bt_context_remove_trace(struct bt_context *ctx, int handle_id)
b469d2dd 95{
6cba487f
MD
96 struct bt_trace_handle *handle;
97
98 handle = g_hash_table_lookup(ctx->trace_handles,
99 (gpointer) (unsigned long) handle_id);
100 assert(handle != NULL);
101
102 /* Remove from containers */
103 trace_collection_remove(ctx->tc, handle->td);
104 g_hash_table_remove(ctx->trace_handles,
105 (gpointer) (unsigned long) handle_id);
106
107 /* Close the trace */
108 handle->format->close_trace(handle->td);
109
110 /* Destory the handle */
111 bt_trace_handle_destroy(handle);
112}
113
114static
115void bt_context_destroy(struct bt_context *ctx)
116{
117 finalize_trace_collection(ctx->tc);
118
119 /* Remote all traces. The g_hash_table_destroy will call
120 * bt_trace_handle_destroy on each elements.
121 */
122 g_hash_table_destroy(ctx->trace_handles);
123
124 /* ctx->tc should always be valid */
125 assert(ctx->tc != NULL);
126 g_free(ctx->tc);
127 g_free(ctx);
b469d2dd
JD
128}
129
6cba487f 130void bt_context_get(struct bt_context *ctx)
b469d2dd 131{
6cba487f
MD
132 ctx->refcount++;
133}
b469d2dd 134
6cba487f
MD
135void bt_context_put(struct bt_context *ctx)
136{
b469d2dd
JD
137 ctx->refcount--;
138 if (ctx->refcount == 0)
6cba487f 139 bt_context_destroy(ctx);
b469d2dd 140}
This page took 0.040706 seconds and 4 git commands to generate.