X-Git-Url: https://git.lttng.org/?p=lttngtop.git;a=blobdiff_plain;f=lib%2Fbabeltrace%2Fcontext.h;fp=lib%2Fbabeltrace%2Fcontext.h;h=b28df09f060cdcac484b08b8927c28b9f7e408f3;hp=0000000000000000000000000000000000000000;hb=b1acd2b342a35dc6c5a8036fb0280321203e89b7;hpb=a18dc7c24b4ac751c46a96198aebcbb1dcd4cdd6

diff --git a/lib/babeltrace/context.h b/lib/babeltrace/context.h
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+#ifndef _BABELTRACE_CONTEXT_H
+#define _BABELTRACE_CONTEXT_H
+
+/*
+ * BabelTrace
+ *
+ * context header
+ *
+ * Copyright 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.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <unistd.h>
+#include <babeltrace/format.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* struct bt_context is opaque to the user */
+struct bt_context;
+struct bt_stream_pos;
+struct bt_ctf_event;
+
+/*
+ * bt_context_create : create a Babeltrace context
+ *
+ * Allocate a new context. The creation of the context sets the refcount
+ * to 1.
+ *
+ * Returns an allocated context on success and NULL on error
+ */
+struct bt_context *bt_context_create(void);
+
+/*
+ * bt_context_add_trace : Add a trace by path to the context
+ *
+ * Open a trace.
+ *
+ * path is the path to the trace, it is not recursive. If "path" is NULL,
+ * stream_list is used instead as a list of mmap streams to open for the trace.
+ *
+ * format is a string containing the format name in which the trace was
+ * produced.
+ *
+ * packet_seek can be NULL to use the default packet_seek handler provided by
+ * the trace format. If non-NULL, it is used as an override of the handler for
+ * seeks across packets. It takes as parameter a stream position, the packet
+ * index it needs to seek to (for SEEK_SET), and a "whence" parameter (either
+ * SEEK_CUR: seek to next packet, or SEEK_SET: seek to packet at packet index).
+ *
+ * stream_list is a linked list of streams, it is used to open a trace where
+ * the trace data is located in memory mapped areas instead of trace files,
+ * this argument should be non-NULL when path is NULL.
+ *
+ * The metadata parameter acts as a metadata override when not NULL, otherwise
+ * the format handles the metadata opening.
+ *
+ * Return: the trace handle id (>= 0) on success, a negative
+ * value on error.
+ */
+int bt_context_add_trace(struct bt_context *ctx, const char *path,
+		const char *format,
+		void (*packet_seek)(struct bt_stream_pos *pos,
+			size_t index, int whence),
+		struct bt_mmap_stream_list *stream_list,
+		FILE *metadata);
+
+/*
+ * bt_context_remove_trace: Remove a trace from the context.
+ *
+ * Effectively closing the trace. Return negative error value if trace
+ * is not in context.
+ */
+int bt_context_remove_trace(struct bt_context *ctx, int trace_id);
+
+/*
+ * bt_context_get and bt_context_put : increments and decrement the
+ * refcount of the context
+ *
+ * These functions ensures that the context won't be destroyed when it
+ * is in use. The same number of get and put (plus one extra put to
+ * release the initial reference done at creation) has to be done to
+ * destroy a context.
+ *
+ * When the context refcount is decremented to 0 by a bt_context_put,
+ * the context is freed.
+ */
+void bt_context_get(struct bt_context *ctx);
+void bt_context_put(struct bt_context *ctx);
+
+/*
+ * bt_ctf_get_context : get the context associated with an event
+ *
+ * Returns NULL on error
+ */
+struct bt_context *bt_ctf_event_get_context(const struct bt_ctf_event *event);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _BABELTRACE_CONTEXT_H */