[babeltrace.git] / lib / context.c

/*
 * context.c
 *
 * Babeltrace Library
 *
 * Copyright 2011-2012 EfficiOS Inc. and Linux Foundation
 *
 * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *         Julien Desfossez <julien.desfossez@efficios.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 */

#include <babeltrace/babeltrace.h>
#include <babeltrace/context.h>
#include <babeltrace/context-internal.h>
#include <babeltrace/trace-handle.h>
#include <babeltrace/trace-handle-internal.h>
#include <babeltrace/trace-collection.h>
#include <babeltrace/format.h>
#include <babeltrace/babeltrace-internal.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>

#include <fts.h>
#include <fcntl.h> /* For O_RDONLY */

#include <glib.h>

struct bt_context *bt_context_create(void)
{
	struct bt_context *ctx;

	ctx = g_new0(struct bt_context, 1);
	ctx->refcount = 1;
	/* Negative handle id are errors. */
	ctx->last_trace_handle_id = 0;

	/* Instanciate the trace handle container */
	ctx->trace_handles = g_hash_table_new_full(g_direct_hash,
				g_direct_equal, NULL,
				(GDestroyNotify) bt_trace_handle_destroy);

	ctx->tc = g_new0(struct trace_collection, 1);
	init_trace_collection(ctx->tc);

	return ctx;
}

int bt_context_add_trace(struct bt_context *ctx, const char *path,
		const char *format_name,
		void (*packet_seek)(struct stream_pos *pos, size_t index,
			int whence),
		struct mmap_stream_list *stream_list,
		FILE *metadata)
{
	struct trace_descriptor *td;
	struct format *fmt;
	struct bt_trace_handle *handle;
	int ret;

	fmt = bt_lookup_format(g_quark_from_string(format_name));
	if (!fmt) {
		fprintf(stderr, "[error] [Context] Format \"%s\" unknown.\n\n",
			format_name);
		ret = -1;
		goto end;
	}
	if (path) {
		td = fmt->open_trace(path, O_RDONLY, packet_seek, NULL);
		if (!td) {
			fprintf(stderr, "[error] [Context] Cannot open_trace of the format %s .\n\n",
					path);
			ret = -1;
			goto end;
		}
	} else {
		td = fmt->open_mmap_trace(stream_list, packet_seek, metadata);
		if (!td) {
			fprintf(stderr, "[error] [Context] Cannot open_trace of the format %s .\n\n",
					path);
			ret = -1;
			goto end;
		}
	}

	/* Create an handle for the trace */
	handle = bt_trace_handle_create(ctx);
	if (handle < 0) {
		fprintf(stderr, "[error] [Context] Creating trace handle %s .\n\n",
				path);
		ret = -1;
		goto end;
	}
	handle->format = fmt;
	handle->td = td;
	strncpy(handle->path, path, PATH_MAX);
	handle->path[PATH_MAX - 1] = '\0';

	/* Add new handle to container */
	g_hash_table_insert(ctx->trace_handles,
		(gpointer) (unsigned long) handle->id,
		handle);
	ret = trace_collection_add(ctx->tc, td);
	if (ret == 0)
		return handle->id;
end:
	return ret;
}

void bt_context_remove_trace(struct bt_context *ctx, int handle_id)
{
	struct bt_trace_handle *handle;

	handle = g_hash_table_lookup(ctx->trace_handles,
		(gpointer) (unsigned long) handle_id);
	assert(handle != NULL);

	/* Remove from containers */
	trace_collection_remove(ctx->tc, handle->td);
	g_hash_table_remove(ctx->trace_handles,
		(gpointer) (unsigned long) handle_id);

	/* Close the trace */
	handle->format->close_trace(handle->td);

	/* Destory the handle */
	bt_trace_handle_destroy(handle);
}

static
void bt_context_destroy(struct bt_context *ctx)
{
	finalize_trace_collection(ctx->tc);

	/* Remote all traces. The g_hash_table_destroy will call
	 * bt_trace_handle_destroy on each elements.
	 */
	g_hash_table_destroy(ctx->trace_handles);

	/* ctx->tc should always be valid */
	assert(ctx->tc != NULL);
	g_free(ctx->tc);
	g_free(ctx);
}

void bt_context_get(struct bt_context *ctx)
{
	ctx->refcount++;
}

void bt_context_put(struct bt_context *ctx)
{
	ctx->refcount--;
	if (ctx->refcount == 0)
		bt_context_destroy(ctx);
}
Commit	Line	Data
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>
e1d01c39	29	#include <babeltrace/babeltrace-internal.h>
b469d2dd	30	#include <stdlib.h>
e1d01c39 MD	31	#include <string.h>
e1d01c39 MD	32	#include <assert.h>
b469d2dd	33
6cba487f MD	34	#include <fts.h>
	35	#include <fcntl.h> /* For O_RDONLY */
	36
6cba487f MD	37	#include <glib.h>
	38
	39	struct 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	59	int bt_context_add_trace(struct bt_context ctx, const char path,
613f532b	60	const char *format_name,
20d0dcf9	61	void (packet_seek)(struct stream_pos pos, size_t index,
0d4c669f MD	62	int whence),
	63	struct mmap_stream_list *stream_list,
	64	FILE *metadata)
6cba487f MD	65	{
	66	struct trace_descriptor *td;
	67	struct format *fmt;
	68	struct bt_trace_handle *handle;
1059a2bf	69	int ret;
6cba487f	70
282e1952 MD	71	fmt = bt_lookup_format(g_quark_from_string(format_name));
	72	if (!fmt) {
	73	fprintf(stderr, "[error] [Context] Format \"%s\" unknown.\n\n",
	74	format_name);
	75	ret = -1;
	76	goto end;
	77	}
0d4c669f MD	78	if (path) {
	79	td = fmt->open_trace(path, O_RDONLY, packet_seek, NULL);
	80	if (!td) {
	81	fprintf(stderr, "[error] [Context] Cannot open_trace of the format %s .\n\n",
	82	path);
	83	ret = -1;
	84	goto end;
	85	}
	86	} else {
	87	td = fmt->open_mmap_trace(stream_list, packet_seek, metadata);
	88	if (!td) {
	89	fprintf(stderr, "[error] [Context] Cannot open_trace of the format %s .\n\n",
	90	path);
	91	ret = -1;
	92	goto end;
	93	}
6cba487f MD	94	}
	95
	96	/* Create an handle for the trace */
	97	handle = bt_trace_handle_create(ctx);
	98	if (handle < 0) {
02dc4610	99	fprintf(stderr, "[error] [Context] Creating trace handle %s .\n\n",
6cba487f	100	path);
1059a2bf JD	101	ret = -1;
1059a2bf JD	102	goto end;
6cba487f MD	103	}
	104	handle->format = fmt;
	105	handle->td = td;
	106	strncpy(handle->path, path, PATH_MAX);
	107	handle->path[PATH_MAX - 1] = '\0';
	108
	109	/* Add new handle to container */
	110	g_hash_table_insert(ctx->trace_handles,
	111	(gpointer) (unsigned long) handle->id,
	112	handle);
1059a2bf JD	113	ret = trace_collection_add(ctx->tc, td);
	114	if (ret == 0)
	115	return handle->id;
	116	end:
	117	return ret;
b469d2dd JD	118	}
b469d2dd JD	119
6cba487f	120	void bt_context_remove_trace(struct bt_context *ctx, int handle_id)
b469d2dd	121	{
6cba487f MD	122	struct bt_trace_handle *handle;
	123
	124	handle = g_hash_table_lookup(ctx->trace_handles,
	125	(gpointer) (unsigned long) handle_id);
	126	assert(handle != NULL);
	127
	128	/* Remove from containers */
	129	trace_collection_remove(ctx->tc, handle->td);
	130	g_hash_table_remove(ctx->trace_handles,
	131	(gpointer) (unsigned long) handle_id);
	132
	133	/* Close the trace */
	134	handle->format->close_trace(handle->td);
	135
	136	/* Destory the handle */
	137	bt_trace_handle_destroy(handle);
	138	}
	139
	140	static
	141	void bt_context_destroy(struct bt_context *ctx)
	142	{
	143	finalize_trace_collection(ctx->tc);
	144
	145	/* Remote all traces. The g_hash_table_destroy will call
	146	* bt_trace_handle_destroy on each elements.
	147	*/
	148	g_hash_table_destroy(ctx->trace_handles);
	149
	150	/* ctx->tc should always be valid */
	151	assert(ctx->tc != NULL);
	152	g_free(ctx->tc);
	153	g_free(ctx);
b469d2dd JD	154	}
b469d2dd JD	155
6cba487f	156	void bt_context_get(struct bt_context *ctx)
b469d2dd	157	{
6cba487f MD	158	ctx->refcount++;
6cba487f MD	159	}
b469d2dd	160
6cba487f MD	161	void bt_context_put(struct bt_context *ctx)
6cba487f MD	162	{
b469d2dd JD	163	ctx->refcount--;
b469d2dd JD	164	if (ctx->refcount == 0)
6cba487f	165	bt_context_destroy(ctx);
b469d2dd	166	}