Fix API: rename unclear move_pos_slow to packet_seek
[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 <stdlib.h>
30
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_packet_seek */
36
37 #include <glib.h>
38
39 struct bt_context *bt_context_create(void)
40 {
41 struct bt_context *ctx;
42
43 ctx = g_new0(struct bt_context, 1);
44 ctx->refcount = 1;
45 /* Negative handle id are errors. */
46 ctx->last_trace_handle_id = 0;
47
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
56 return ctx;
57 }
58
59 int bt_context_add_trace(struct bt_context *ctx, const char *path,
60 const char *format_name)
61 {
62 struct trace_descriptor *td;
63 struct format *fmt;
64 struct bt_trace_handle *handle;
65 int ret;
66
67 fmt = bt_lookup_format(g_quark_from_string(format_name));
68 if (!fmt) {
69 fprintf(stderr, "[error] [Context] Format \"%s\" unknown.\n\n",
70 format_name);
71 ret = -1;
72 goto end;
73 }
74 td = fmt->open_trace(path, O_RDONLY,
75 ctf_packet_seek, NULL);
76 if (!td) {
77 fprintf(stderr, "[error] [Context] Cannot open_trace of the format %s .\n\n",
78 path);
79 ret = -1;
80 goto end;
81 }
82
83 /* Create an handle for the trace */
84 handle = bt_trace_handle_create(ctx);
85 if (handle < 0) {
86 fprintf(stderr, "[error] [Context] Creating trace handle %s .\n\n",
87 path);
88 ret = -1;
89 goto end;
90 }
91 handle->format = fmt;
92 handle->td = td;
93 strncpy(handle->path, path, PATH_MAX);
94 handle->path[PATH_MAX - 1] = '\0';
95
96 /* Add new handle to container */
97 g_hash_table_insert(ctx->trace_handles,
98 (gpointer) (unsigned long) handle->id,
99 handle);
100 ret = trace_collection_add(ctx->tc, td);
101 if (ret == 0)
102 return handle->id;
103 end:
104 return ret;
105 }
106
107 void bt_context_remove_trace(struct bt_context *ctx, int handle_id)
108 {
109 struct bt_trace_handle *handle;
110
111 handle = g_hash_table_lookup(ctx->trace_handles,
112 (gpointer) (unsigned long) handle_id);
113 assert(handle != NULL);
114
115 /* Remove from containers */
116 trace_collection_remove(ctx->tc, handle->td);
117 g_hash_table_remove(ctx->trace_handles,
118 (gpointer) (unsigned long) handle_id);
119
120 /* Close the trace */
121 handle->format->close_trace(handle->td);
122
123 /* Destory the handle */
124 bt_trace_handle_destroy(handle);
125 }
126
127 static
128 void bt_context_destroy(struct bt_context *ctx)
129 {
130 finalize_trace_collection(ctx->tc);
131
132 /* Remote all traces. The g_hash_table_destroy will call
133 * bt_trace_handle_destroy on each elements.
134 */
135 g_hash_table_destroy(ctx->trace_handles);
136
137 /* ctx->tc should always be valid */
138 assert(ctx->tc != NULL);
139 g_free(ctx->tc);
140 g_free(ctx);
141 }
142
143 void bt_context_get(struct bt_context *ctx)
144 {
145 ctx->refcount++;
146 }
147
148 void bt_context_put(struct bt_context *ctx)
149 {
150 ctx->refcount--;
151 if (ctx->refcount == 0)
152 bt_context_destroy(ctx);
153 }
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