X-Git-Url: http://git.efficios.com/?p=babeltrace.git;a=blobdiff_plain;f=formats%2Fctf%2Fctf.c;h=b02ef2a23b62949c91f0629e36dce2dc2e0cc7cb;hp=580133cc86c873fef4225e0bf3fbd65ff2019bb8;hb=42dc00b7cd26b1d33e80aaeffc744eb45093a14d;hpb=c054553dac076f91196b372fa19efaf2adc4e4f9

diff --git a/formats/ctf/ctf.c b/formats/ctf/ctf.c
index 580133cc..b02ef2a2 100644
--- a/formats/ctf/ctf.c
+++ b/formats/ctf/ctf.c
@@ -18,34 +18,1194 @@
 
 #include <babeltrace/format.h>
 #include <babeltrace/ctf/types.h>
+#include <babeltrace/ctf/metadata.h>
+#include <babeltrace/babeltrace.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <uuid/uuid.h>
+#include <sys/mman.h>
+#include <errno.h>
+#include <endian.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <dirent.h>
+#include <glib.h>
+#include <unistd.h>
+#include <stdlib.h>
 
-void __attribute__((constructor)) ctf_init(void);
-
-static struct format ctf_format = {
-	.uint_read = ctf_uint_read,
-	.int_read = ctf_int_read,
-	.uint_write = ctf_uint_write,
-	.int_write = ctf_int_write,
-	.double_read = ctf_double_read,
-	.double_write = ctf_double_write,
-	.float_copy = ctf_float_copy,
-	.string_copy = ctf_string_copy,
-	.string_read = ctf_string_read,
-	.string_write = ctf_string_write,
-	.string_free_temp = ctf_string_free_temp,
-	.enum_read = ctf_enum_read,
-	.enum_write = ctf_enum_write,
-	.struct_begin = ctf_struct_begin,
-	.struct_end = ctf_struct_end,
-	.variant_begin = ctf_variant_begin,
-	.variant_end = ctf_variant_end,
-	.array_begin = ctf_array_begin,
-	.array_end = ctf_array_end,
-	.sequence_begin = ctf_sequence_begin,
-	.sequence_end = ctf_sequence_end,
+#include "metadata/ctf-scanner.h"
+#include "metadata/ctf-parser.h"
+#include "metadata/ctf-ast.h"
+
+/*
+ * We currently simply map a page to read the packet header and packet
+ * context to get the packet length and content length. (in bits)
+ */
+#define MAX_PACKET_HEADER_LEN	(getpagesize() * CHAR_BIT)
+#define WRITE_PACKET_LEN	(getpagesize() * 8 * CHAR_BIT)
+#define UUID_LEN 16	/* uuid by value len */
+
+#ifndef min
+#define min(a, b)	(((a) < (b)) ? (a) : (b))
+#endif
+
+extern int yydebug;
+
+static
+struct trace_descriptor *ctf_open_trace(const char *path, int flags);
+static
+void ctf_close_trace(struct trace_descriptor *descriptor);
+
+static
+rw_dispatch read_dispatch_table[] = {
+	[ CTF_TYPE_INTEGER ] = ctf_integer_read,
+	[ CTF_TYPE_FLOAT ] = ctf_float_read,
+	[ CTF_TYPE_ENUM ] = ctf_enum_read,
+	[ CTF_TYPE_STRING ] = ctf_string_read,
+	[ CTF_TYPE_STRUCT ] = ctf_struct_rw,
+	[ CTF_TYPE_VARIANT ] = ctf_variant_rw,
+	[ CTF_TYPE_ARRAY ] = ctf_array_read,
+	[ CTF_TYPE_SEQUENCE ] = ctf_sequence_read,
+};
+
+static
+rw_dispatch write_dispatch_table[] = {
+	[ CTF_TYPE_INTEGER ] = ctf_integer_write,
+	[ CTF_TYPE_FLOAT ] = ctf_float_write,
+	[ CTF_TYPE_ENUM ] = ctf_enum_write,
+	[ CTF_TYPE_STRING ] = ctf_string_write,
+	[ CTF_TYPE_STRUCT ] = ctf_struct_rw,
+	[ CTF_TYPE_VARIANT ] = ctf_variant_rw,
+	[ CTF_TYPE_ARRAY ] = ctf_array_write,
+	[ CTF_TYPE_SEQUENCE ] = ctf_sequence_write,
 };
 
-void ctf_init(void)
+static
+struct format ctf_format = {
+	.open_trace = ctf_open_trace,
+	.close_trace = ctf_close_trace,
+};
+
+static
+void ctf_update_timestamp(struct ctf_stream *stream,
+			  struct definition_integer *integer_definition)
+{
+	struct declaration_integer *integer_declaration =
+		integer_definition->declaration;
+	uint64_t oldval, newval, updateval;
+
+	if (integer_declaration->len == 64) {
+		stream->timestamp = integer_definition->value._unsigned;
+		return;
+	}
+	/* keep low bits */
+	oldval = stream->timestamp;
+	oldval &= (1ULL << integer_declaration->len) - 1;
+	newval = integer_definition->value._unsigned;
+	/* Test for overflow by comparing low bits */
+	if (newval < oldval)
+		newval += 1ULL << integer_declaration->len;
+	/* updateval contains old high bits, and new low bits (sum) */
+	updateval = stream->timestamp;
+	updateval &= ~((1ULL << integer_declaration->len) - 1);
+	updateval += newval;
+	stream->timestamp = updateval;
+}
+
+static
+int ctf_read_event(struct stream_pos *ppos, struct ctf_stream *stream)
+{
+	struct ctf_stream_pos *pos =
+		container_of(ppos, struct ctf_stream_pos, parent);
+	struct ctf_stream_class *stream_class = stream->stream_class;
+	struct ctf_stream_event *event;
+	uint64_t id = 0;
+	int ret;
+
+	if (pos->offset == EOF)
+		return EOF;
+
+	/* Read event header */
+	if (stream->stream_event_header) {
+		struct definition_integer *integer_definition;
+		struct definition *variant;
+
+		ret = generic_rw(ppos, &stream->stream_event_header->p);
+		if (ret)
+			goto error;
+		/* lookup event id */
+		integer_definition = lookup_integer(&stream->stream_event_header->p, "id", FALSE);
+		if (integer_definition) {
+			id = integer_definition->value._unsigned;
+		} else {
+			struct definition_enum *enum_definition;
+
+			enum_definition = lookup_enum(&stream->stream_event_header->p, "id", FALSE);
+			if (enum_definition) {
+				id = enum_definition->integer->value._unsigned;
+			}
+		}
+
+		variant = lookup_variant(&stream->stream_event_header->p, "v");
+		if (variant) {
+			integer_definition = lookup_integer(variant, "id", FALSE);
+			if (integer_definition) {
+				id = integer_definition->value._unsigned;
+			}
+		}
+
+		/* lookup timestamp */
+		integer_definition = lookup_integer(&stream->stream_event_header->p, "timestamp", FALSE);
+		if (integer_definition) {
+			ctf_update_timestamp(stream, integer_definition);
+		} else {
+			if (variant) {
+				integer_definition = lookup_integer(variant, "timestamp", FALSE);
+				if (integer_definition) {
+					ctf_update_timestamp(stream, integer_definition);
+				}
+			}
+		}
+	}
+
+	/* Read stream-declared event context */
+	if (stream->stream_event_context) {
+		ret = generic_rw(ppos, &stream->stream_event_context->p);
+		if (ret)
+			goto error;
+	}
+
+	if (id >= stream_class->events_by_id->len) {
+		fprintf(stdout, "[error] Event id %" PRIu64 " is outside range.\n", id);
+		return -EINVAL;
+	}
+	event = g_ptr_array_index(stream->events_by_id, id);
+	if (!event) {
+		fprintf(stdout, "[error] Event id %" PRIu64 " is unknown.\n", id);
+		return -EINVAL;
+	}
+
+	/* Read event-declared event context */
+	if (event->event_context) {
+		ret = generic_rw(ppos, &event->event_context->p);
+		if (ret)
+			goto error;
+	}
+
+	/* Read event payload */
+	if (event->event_fields) {
+		ret = generic_rw(ppos, &event->event_fields->p);
+		if (ret)
+			goto error;
+	}
+
+	return 0;
+
+error:
+	fprintf(stdout, "[error] Unexpected end of stream. Either the trace data stream is corrupted or metadata description does not match data layout.\n");
+	return ret;
+}
+
+static
+int ctf_write_event(struct stream_pos *pos, struct ctf_stream *stream)
+{
+	struct ctf_stream_class *stream_class = stream->stream_class;
+	struct ctf_stream_event *event;
+	uint64_t id = 0;
+	int ret;
+
+	/* print event header */
+	if (stream->stream_event_header) {
+		struct definition_integer *integer_definition;
+		struct definition *variant;
+
+		/* lookup event id */
+		integer_definition = lookup_integer(&stream->stream_event_header->p, "id", FALSE);
+		if (integer_definition) {
+			id = integer_definition->value._unsigned;
+		} else {
+			struct definition_enum *enum_definition;
+
+			enum_definition = lookup_enum(&stream->stream_event_header->p, "id", FALSE);
+			if (enum_definition) {
+				id = enum_definition->integer->value._unsigned;
+			}
+		}
+
+		variant = lookup_variant(&stream->stream_event_header->p, "v");
+		if (variant) {
+			integer_definition = lookup_integer(variant, "id", FALSE);
+			if (integer_definition) {
+				id = integer_definition->value._unsigned;
+			}
+		}
+
+		ret = generic_rw(pos, &stream->stream_event_header->p);
+		if (ret)
+			goto error;
+	}
+
+	/* print stream-declared event context */
+	if (stream->stream_event_context) {
+		ret = generic_rw(pos, &stream->stream_event_context->p);
+		if (ret)
+			goto error;
+	}
+
+	if (id >= stream_class->events_by_id->len) {
+		fprintf(stdout, "[error] Event id %" PRIu64 " is outside range.\n", id);
+		return -EINVAL;
+	}
+	event = g_ptr_array_index(stream->events_by_id, id);
+	if (!event) {
+		fprintf(stdout, "[error] Event id %" PRIu64 " is unknown.\n", id);
+		return -EINVAL;
+	}
+
+	/* print event-declared event context */
+	if (event->event_context) {
+		ret = generic_rw(pos, &event->event_context->p);
+		if (ret)
+			goto error;
+	}
+
+	/* Read and print event payload */
+	if (event->event_fields) {
+		ret = generic_rw(pos, &event->event_fields->p);
+		if (ret)
+			goto error;
+	}
+
+	return 0;
+
+error:
+	fprintf(stdout, "[error] Unexpected end of stream. Either the trace data stream is corrupted or metadata description does not match data layout.\n");
+	return ret;
+}
+
+void ctf_init_pos(struct ctf_stream_pos *pos, int fd, int open_flags)
+{
+	pos->fd = fd;
+	pos->mmap_offset = 0;
+	pos->packet_size = 0;
+	pos->content_size = 0;
+	pos->content_size_loc = NULL;
+	pos->base = NULL;
+	pos->offset = 0;
+	pos->dummy = false;
+	pos->cur_index = 0;
+	if (fd >= 0)
+		pos->packet_index = g_array_new(FALSE, TRUE,
+						sizeof(struct packet_index));
+	else
+		pos->packet_index = NULL;
+	switch (open_flags & O_ACCMODE) {
+	case O_RDONLY:
+		pos->prot = PROT_READ;
+		pos->flags = MAP_PRIVATE;
+		pos->parent.rw_table = read_dispatch_table;
+		pos->parent.event_cb = ctf_read_event;
+		break;
+	case O_RDWR:
+		pos->prot = PROT_WRITE;	/* Write has priority */
+		pos->flags = MAP_SHARED;
+		pos->parent.rw_table = write_dispatch_table;
+		pos->parent.event_cb = ctf_write_event;
+		if (fd >= 0)
+			ctf_move_pos_slow(pos, 0, SEEK_SET);	/* position for write */
+		break;
+	default:
+		assert(0);
+	}
+}
+
+void ctf_fini_pos(struct ctf_stream_pos *pos)
+{
+	int ret;
+
+	if (pos->prot == PROT_WRITE && pos->content_size_loc)
+		*pos->content_size_loc = pos->offset;
+	if (pos->base) {
+		/* unmap old base */
+		ret = munmap(pos->base, pos->packet_size / CHAR_BIT);
+		if (ret) {
+			fprintf(stdout, "[error] Unable to unmap old base: %s.\n",
+				strerror(errno));
+			assert(0);
+		}
+	}
+	(void) g_array_free(pos->packet_index, TRUE);
+}
+
+void ctf_move_pos_slow(struct ctf_stream_pos *pos, size_t offset, int whence)
+{
+	struct ctf_file_stream *file_stream =
+		container_of(pos, struct ctf_file_stream, pos);
+	int ret;
+	off_t off;
+	struct packet_index *index;
+
+	if (pos->prot == PROT_WRITE && pos->content_size_loc)
+		*pos->content_size_loc = pos->offset;
+
+	if (pos->base) {
+		/* unmap old base */
+		ret = munmap(pos->base, pos->packet_size / CHAR_BIT);
+		if (ret) {
+			fprintf(stdout, "[error] Unable to unmap old base: %s.\n",
+				strerror(errno));
+			assert(0);
+		}
+		pos->base = NULL;
+	}
+
+	/*
+	 * The caller should never ask for ctf_move_pos across packets,
+	 * except to get exactly at the beginning of the next packet.
+	 */
+	if (pos->prot == PROT_WRITE) {
+		switch (whence) {
+		case SEEK_CUR:
+			/* The writer will add padding */
+			assert(pos->offset + offset == pos->packet_size);
+			pos->mmap_offset += WRITE_PACKET_LEN / CHAR_BIT;
+			break;
+		case SEEK_SET:
+			assert(offset == 0);	/* only seek supported for now */
+			pos->cur_index = 0;
+			break;
+		default:
+			assert(0);
+		}
+		pos->content_size = -1U;	/* Unknown at this point */
+		pos->packet_size = WRITE_PACKET_LEN;
+		off = posix_fallocate(pos->fd, pos->mmap_offset,
+				      pos->packet_size / CHAR_BIT);
+		assert(off >= 0);
+		pos->offset = 0;
+	} else {
+		switch (whence) {
+		case SEEK_CUR:
+			/* The reader will expect us to skip padding */
+			assert(pos->offset + offset == pos->content_size);
+			++pos->cur_index;
+			break;
+		case SEEK_SET:
+			assert(offset == 0);	/* only seek supported for now */
+			pos->cur_index = 0;
+			break;
+		default:
+			assert(0);
+		}
+		if (pos->cur_index >= pos->packet_index->len) {
+			pos->offset = EOF;
+			return;
+		}
+		index = &g_array_index(pos->packet_index, struct packet_index,
+				       pos->cur_index);
+		pos->mmap_offset = index->offset;
+
+		/* Lookup context/packet size in index */
+		file_stream->stream.timestamp = index->timestamp_begin;
+		pos->content_size = index->content_size;
+		pos->packet_size = index->packet_size;
+		if (index->data_offset < index->content_size)
+			pos->offset = 0;	/* will read headers */
+		else {
+			pos->offset = EOF;
+			return;
+		}
+	}
+	/* map new base. Need mapping length from header. */
+	pos->base = mmap(NULL, pos->packet_size / CHAR_BIT, pos->prot,
+			 pos->flags, pos->fd, pos->mmap_offset);
+	if (pos->base == MAP_FAILED) {
+		fprintf(stdout, "[error] mmap error %s.\n",
+			strerror(errno));
+		assert(0);
+	}
+
+	/* update trace_packet_header and stream_packet_context */
+	if (pos->prot != PROT_WRITE && file_stream->stream.trace_packet_header) {
+		/* Read packet header */
+		ret = generic_rw(&pos->parent, &file_stream->stream.trace_packet_header->p);
+		assert(!ret);
+	}
+	if (pos->prot != PROT_WRITE && file_stream->stream.stream_packet_context) {
+		/* Read packet context */
+		ret = generic_rw(&pos->parent, &file_stream->stream.stream_packet_context->p);
+		assert(!ret);
+	}
+}
+
+static
+int packet_metadata(struct ctf_trace *td, FILE *fp)
+{
+	uint32_t magic;
+	size_t len;
+	int ret = 0;
+
+	len = fread(&magic, sizeof(magic), 1, fp);
+	if (len != 1) {
+		goto end;
+	}
+	if (magic == TSDL_MAGIC) {
+		ret = 1;
+		td->byte_order = BYTE_ORDER;
+	} else if (magic == GUINT32_SWAP_LE_BE(TSDL_MAGIC)) {
+		ret = 1;
+		td->byte_order = (BYTE_ORDER == BIG_ENDIAN) ?
+					LITTLE_ENDIAN : BIG_ENDIAN;
+	}
+	CTF_TRACE_SET_FIELD(td, byte_order);
+end:
+	rewind(fp);
+	return ret;
+}
+
+static
+int ctf_open_trace_metadata_packet_read(struct ctf_trace *td, FILE *in,
+					FILE *out)
+{
+	struct metadata_packet_header header;
+	size_t readlen, writelen, toread;
+	char buf[4096];
+	int ret = 0;
+
+	readlen = fread(&header, header_sizeof(header), 1, in);
+	if (readlen < 1)
+		return -EINVAL;
+
+	if (td->byte_order != BYTE_ORDER) {
+		header.magic = GUINT32_SWAP_LE_BE(header.magic);
+		header.checksum = GUINT32_SWAP_LE_BE(header.checksum);
+		header.content_size = GUINT32_SWAP_LE_BE(header.content_size);
+		header.packet_size = GUINT32_SWAP_LE_BE(header.packet_size);
+	}
+	if (header.checksum)
+		fprintf(stdout, "[warning] checksum verification not supported yet.\n");
+	if (header.compression_scheme) {
+		fprintf(stdout, "[error] compression (%u) not supported yet.\n",
+			header.compression_scheme);
+		return -EINVAL;
+	}
+	if (header.encryption_scheme) {
+		fprintf(stdout, "[error] encryption (%u) not supported yet.\n",
+			header.encryption_scheme);
+		return -EINVAL;
+	}
+	if (header.checksum_scheme) {
+		fprintf(stdout, "[error] checksum (%u) not supported yet.\n",
+			header.checksum_scheme);
+		return -EINVAL;
+	}
+	if (!CTF_TRACE_FIELD_IS_SET(td, uuid)) {
+		memcpy(td->uuid, header.uuid, sizeof(header.uuid));
+		CTF_TRACE_SET_FIELD(td, uuid);
+	} else {
+		if (uuid_compare(header.uuid, td->uuid))
+			return -EINVAL;
+	}
+
+	toread = (header.content_size / CHAR_BIT) - header_sizeof(header);
+
+	for (;;) {
+		readlen = fread(buf, sizeof(char), min(sizeof(buf), toread), in);
+		if (ferror(in)) {
+			ret = -EINVAL;
+			break;
+		}
+		if (babeltrace_debug) {
+			fprintf(stdout, "[debug] metadata packet read: %s\n",
+				buf);
+		}
+
+		writelen = fwrite(buf, sizeof(char), readlen, out);
+		if (writelen < readlen) {
+			ret = -EIO;
+			break;
+		}
+		if (ferror(out)) {
+			ret = -EINVAL;
+			break;
+		}
+		toread -= readlen;
+		if (!toread) {
+			ret = 0;	/* continue reading next packet */
+			break;
+		}
+	}
+	return ret;
+}
+
+static
+int ctf_open_trace_metadata_stream_read(struct ctf_trace *td, FILE **fp,
+					char **buf)
+{
+	FILE *in, *out;
+	size_t size;
+	int ret;
+
+	in = *fp;
+	/*
+	 * Using strlen on *buf instead of size of open_memstream
+	 * because its size includes garbage at the end (after final
+	 * \0). This is the allocated size, not the actual string size.
+	 */
+	out = open_memstream(buf, &size);
+	if (out == NULL)
+		return -errno;
+
+	for (;;) {
+		ret = ctf_open_trace_metadata_packet_read(td, in, out);
+		if (ret) {
+			break;
+		}
+		if (feof(in)) {
+			ret = 0;
+			break;
+		}
+	}
+	fclose(out);	/* flush the buffer */
+	fclose(in);
+	/* open for reading */
+	*fp = fmemopen(*buf, strlen(*buf), "rb");
+	return 0;
+}
+
+static
+int ctf_open_trace_metadata_read(struct ctf_trace *td)
+{
+	struct ctf_scanner *scanner;
+	FILE *fp;
+	char *buf = NULL;
+	int ret = 0;
+
+	td->metadata.pos.fd = openat(td->dirfd, "metadata", O_RDONLY);
+	if (td->metadata.pos.fd < 0) {
+		fprintf(stdout, "Unable to open metadata.\n");
+		return td->metadata.pos.fd;
+	}
+
+	if (babeltrace_debug)
+		yydebug = 1;
+
+	fp = fdopen(td->metadata.pos.fd, "r");
+	if (!fp) {
+		fprintf(stdout, "[error] Unable to open metadata stream.\n");
+		ret = -errno;
+		goto end_stream;
+	}
+
+	if (packet_metadata(td, fp)) {
+		ret = ctf_open_trace_metadata_stream_read(td, &fp, &buf);
+		if (ret)
+			goto end_packet_read;
+	}
+
+	scanner = ctf_scanner_alloc(fp);
+	if (!scanner) {
+		fprintf(stdout, "[error] Error allocating scanner\n");
+		ret = -ENOMEM;
+		goto end_scanner_alloc;
+	}
+	ret = ctf_scanner_append_ast(scanner);
+	if (ret) {
+		fprintf(stdout, "[error] Error creating AST\n");
+		goto end;
+	}
+
+	if (babeltrace_debug) {
+		ret = ctf_visitor_print_xml(stdout, 0, &scanner->ast->root);
+		if (ret) {
+			fprintf(stdout, "[error] Error visiting AST for XML output\n");
+			goto end;
+		}
+	}
+
+	ret = ctf_visitor_semantic_check(stdout, 0, &scanner->ast->root);
+	if (ret) {
+		fprintf(stdout, "[error] Error in CTF semantic validation %d\n", ret);
+		goto end;
+	}
+	ret = ctf_visitor_construct_metadata(stdout, 0, &scanner->ast->root,
+			td, BYTE_ORDER);
+	if (ret) {
+		fprintf(stdout, "[error] Error in CTF metadata constructor %d\n", ret);
+		goto end;
+	}
+end:
+	ctf_scanner_free(scanner);
+end_scanner_alloc:
+end_packet_read:
+	fclose(fp);
+	free(buf);
+end_stream:
+	close(td->metadata.pos.fd);
+	return ret;
+}
+
+static
+struct ctf_stream_event *create_event_definitions(struct ctf_trace *td,
+						  struct ctf_stream *stream,
+						  struct ctf_event *event)
+{
+	struct ctf_stream_event *stream_event = g_new0(struct ctf_stream_event, 1);
+
+	if (event->context_decl) {
+		struct definition *definition =
+			event->context_decl->p.definition_new(&event->context_decl->p,
+				stream->parent_def_scope, 0, 0, "event.context");
+		if (!definition) {
+			goto error;
+		}
+		stream_event->event_context = container_of(definition,
+					struct definition_struct, p);
+		stream->parent_def_scope = stream_event->event_context->p.scope;
+	}
+	if (event->fields_decl) {
+		struct definition *definition =
+			event->fields_decl->p.definition_new(&event->fields_decl->p,
+				stream->parent_def_scope, 0, 0, "event.fields");
+		if (!definition) {
+			goto error;
+		}
+		stream_event->event_fields = container_of(definition,
+					struct definition_struct, p);
+		stream->parent_def_scope = stream_event->event_fields->p.scope;
+	}
+	return stream_event;
+
+error:
+	if (stream_event->event_fields)
+		definition_unref(&stream_event->event_fields->p);
+	if (stream_event->event_context)
+		definition_unref(&stream_event->event_context->p);
+	return NULL;
+}
+
+static
+int create_stream_definitions(struct ctf_trace *td, struct ctf_stream *stream)
+{
+	struct ctf_stream_class *stream_class;
+	int ret;
+	int i;
+
+	if (stream->stream_definitions_created)
+		return 0;
+
+	stream_class = stream->stream_class;
+
+	if (stream_class->packet_context_decl) {
+		struct definition *definition =
+			stream_class->packet_context_decl->p.definition_new(&stream_class->packet_context_decl->p,
+				stream->parent_def_scope, 0, 0, "stream.packet.context");
+		if (!definition) {
+			ret = -EINVAL;
+			goto error;
+		}
+		stream->stream_packet_context = container_of(definition,
+						struct definition_struct, p);
+		stream->parent_def_scope = stream->stream_packet_context->p.scope;
+	}
+	if (stream_class->event_header_decl) {
+		struct definition *definition =
+			stream_class->event_header_decl->p.definition_new(&stream_class->event_header_decl->p,
+				stream->parent_def_scope, 0, 0, "stream.event.header");
+		if (!definition) {
+			ret = -EINVAL;
+			goto error;
+		}
+		stream->stream_event_header =
+			container_of(definition, struct definition_struct, p);
+		stream->parent_def_scope = stream->stream_event_header->p.scope;
+	}
+	if (stream_class->event_context_decl) {
+		struct definition *definition =
+			stream_class->event_context_decl->p.definition_new(&stream_class->event_context_decl->p,
+				stream->parent_def_scope, 0, 0, "stream.event.context");
+		if (!definition) {
+			ret = -EINVAL;
+			goto error;
+		}
+		stream->stream_event_context =
+			container_of(definition, struct definition_struct, p);
+		stream->parent_def_scope = stream->stream_event_context->p.scope;
+	}
+	stream->events_by_id = g_ptr_array_new();
+	g_ptr_array_set_size(stream->events_by_id, stream_class->events_by_id->len);
+	for (i = 0; i < stream->events_by_id->len; i++) {
+		struct ctf_event *event = g_ptr_array_index(stream_class->events_by_id, i);
+		struct ctf_stream_event *stream_event;
+
+		if (!event)
+			continue;
+		stream_event = create_event_definitions(td, stream, event);
+		if (!stream_event)
+			goto error_event;
+		g_ptr_array_index(stream->events_by_id, i) = stream_event;
+	}
+	return 0;
+
+error_event:
+	for (i = 0; i < stream->events_by_id->len; i++) {
+		struct ctf_stream_event *stream_event = g_ptr_array_index(stream->events_by_id, i);
+		if (stream_event)
+			g_free(stream_event);
+	}
+	g_ptr_array_free(stream->events_by_id, TRUE);
+error:
+	if (stream->stream_event_context)
+		definition_unref(&stream->stream_event_context->p);
+	if (stream->stream_event_header)
+		definition_unref(&stream->stream_event_header->p);
+	if (stream->stream_packet_context)
+		definition_unref(&stream->stream_packet_context->p);
+	return ret;
+}
+
+
+static
+int create_stream_packet_index(struct ctf_trace *td,
+			       struct ctf_file_stream *file_stream)
+{
+	struct ctf_stream_class *stream;
+	int len_index;
+	struct ctf_stream_pos *pos;
+	struct stat filestats;
+	struct packet_index packet_index;
+	int first_packet = 1;
+	int ret;
+
+	pos = &file_stream->pos;
+
+	ret = fstat(pos->fd, &filestats);
+	if (ret < 0)
+		return ret;
+
+	if (filestats.st_size < MAX_PACKET_HEADER_LEN / CHAR_BIT)
+		return -EINVAL;
+
+	for (pos->mmap_offset = 0; pos->mmap_offset < filestats.st_size; ) {
+		uint64_t stream_id = 0;
+
+		if (pos->base) {
+			/* unmap old base */
+			ret = munmap(pos->base, pos->packet_size / CHAR_BIT);
+			if (ret) {
+				fprintf(stdout, "[error] Unable to unmap old base: %s.\n",
+					strerror(errno));
+				return ret;
+			}
+			pos->base = NULL;
+		}
+		/* map new base. Need mapping length from header. */
+		pos->base = mmap(NULL, MAX_PACKET_HEADER_LEN / CHAR_BIT, PROT_READ,
+				 MAP_PRIVATE, pos->fd, pos->mmap_offset);
+		pos->content_size = MAX_PACKET_HEADER_LEN;	/* Unknown at this point */
+		pos->packet_size = MAX_PACKET_HEADER_LEN;	/* Unknown at this point */
+		pos->offset = 0;	/* Position of the packet header */
+
+		packet_index.offset = pos->mmap_offset;
+		packet_index.content_size = 0;
+		packet_index.packet_size = 0;
+		packet_index.timestamp_begin = 0;
+		packet_index.timestamp_end = 0;
+
+		/* read and check header, set stream id (and check) */
+		if (file_stream->stream.trace_packet_header) {
+			/* Read packet header */
+			ret = generic_rw(&pos->parent, &file_stream->stream.trace_packet_header->p);
+			if (ret)
+				return ret;
+			len_index = struct_declaration_lookup_field_index(file_stream->stream.trace_packet_header->declaration, g_quark_from_static_string("magic"));
+			if (len_index >= 0) {
+				struct definition_integer *defint;
+				struct definition *field;
+
+				field = struct_definition_get_field_from_index(file_stream->stream.trace_packet_header, len_index);
+				assert(field->declaration->id == CTF_TYPE_INTEGER);
+				defint = container_of(field, struct definition_integer, p);
+				assert(defint->declaration->signedness == FALSE);
+				if (defint->value._unsigned != CTF_MAGIC) {
+					fprintf(stdout, "[error] Invalid magic number 0x%" PRIX64 " at packet %u (file offset %zd).\n",
+							defint->value._unsigned,
+							file_stream->pos.packet_index->len,
+							(ssize_t) pos->mmap_offset);
+					return -EINVAL;
+				}
+			}
+
+			/* check uuid */
+			len_index = struct_declaration_lookup_field_index(file_stream->stream.trace_packet_header->declaration, g_quark_from_static_string("uuid"));
+			if (len_index >= 0) {
+				struct definition_array *defarray;
+				struct definition *field;
+				uint64_t i;
+				uint8_t uuidval[UUID_LEN];
+
+				field = struct_definition_get_field_from_index(file_stream->stream.trace_packet_header, len_index);
+				assert(field->declaration->id == CTF_TYPE_ARRAY);
+				defarray = container_of(field, struct definition_array, p);
+				assert(array_len(defarray) == UUID_LEN);
+				assert(defarray->declaration->elem->id == CTF_TYPE_INTEGER);
+
+				for (i = 0; i < UUID_LEN; i++) {
+					struct definition *elem;
+					struct definition_integer *defint;
+
+					elem = array_index(defarray, i);
+					assert(elem);
+					defint = container_of(elem, struct definition_integer, p);
+					uuidval[i] = defint->value._unsigned;
+				}
+				ret = uuid_compare(td->uuid, uuidval);
+				if (ret) {
+					fprintf(stdout, "[error] Unique Universal Identifiers do not match.\n");
+					return -EINVAL;
+				}
+			}
+
+
+			len_index = struct_declaration_lookup_field_index(file_stream->stream.trace_packet_header->declaration, g_quark_from_static_string("stream_id"));
+			if (len_index >= 0) {
+				struct definition_integer *defint;
+				struct definition *field;
+
+				field = struct_definition_get_field_from_index(file_stream->stream.trace_packet_header, len_index);
+				assert(field->declaration->id == CTF_TYPE_INTEGER);
+				defint = container_of(field, struct definition_integer, p);
+				assert(defint->declaration->signedness == FALSE);
+				stream_id = defint->value._unsigned;
+			}
+		}
+
+		if (!first_packet && file_stream->stream_id != stream_id) {
+			fprintf(stdout, "[error] Stream ID is changing within a stream.\n");
+			return -EINVAL;
+		}
+		if (first_packet) {
+			file_stream->stream_id = stream_id;
+			if (stream_id >= td->streams->len) {
+				fprintf(stdout, "[error] Stream %" PRIu64 " is not declared in metadata.\n", stream_id);
+				return -EINVAL;
+			}
+			stream = g_ptr_array_index(td->streams, stream_id);
+			if (!stream) {
+				fprintf(stdout, "[error] Stream %" PRIu64 " is not declared in metadata.\n", stream_id);
+				return -EINVAL;
+			}
+			file_stream->stream.stream_class = stream;
+		}
+		first_packet = 0;
+
+		ret = create_stream_definitions(td, &file_stream->stream);
+		if (ret)
+			return ret;
+
+		if (file_stream->stream.stream_packet_context) {
+			/* Read packet context */
+			ret = generic_rw(&pos->parent, &file_stream->stream.stream_packet_context->p);
+			if (ret)
+				return ret;
+			/* read content size from header */
+			len_index = struct_declaration_lookup_field_index(file_stream->stream.stream_packet_context->declaration, g_quark_from_static_string("content_size"));
+			if (len_index >= 0) {
+				struct definition_integer *defint;
+				struct definition *field;
+
+				field = struct_definition_get_field_from_index(file_stream->stream.stream_packet_context, len_index);
+				assert(field->declaration->id == CTF_TYPE_INTEGER);
+				defint = container_of(field, struct definition_integer, p);
+				assert(defint->declaration->signedness == FALSE);
+				packet_index.content_size = defint->value._unsigned;
+			} else {
+				/* Use file size for packet size */
+				packet_index.content_size = filestats.st_size * CHAR_BIT;
+			}
+
+			/* read packet size from header */
+			len_index = struct_declaration_lookup_field_index(file_stream->stream.stream_packet_context->declaration, g_quark_from_static_string("packet_size"));
+			if (len_index >= 0) {
+				struct definition_integer *defint;
+				struct definition *field;
+
+				field = struct_definition_get_field_from_index(file_stream->stream.stream_packet_context, len_index);
+				assert(field->declaration->id == CTF_TYPE_INTEGER);
+				defint = container_of(field, struct definition_integer, p);
+				assert(defint->declaration->signedness == FALSE);
+				packet_index.packet_size = defint->value._unsigned;
+			} else {
+				/* Use content size if non-zero, else file size */
+				packet_index.packet_size = packet_index.content_size ? : filestats.st_size * CHAR_BIT;
+			}
+
+			/* read timestamp begin from header */
+			len_index = struct_declaration_lookup_field_index(file_stream->stream.stream_packet_context->declaration, g_quark_from_static_string("timestamp_begin"));
+			if (len_index >= 0) {
+				struct definition_integer *defint;
+				struct definition *field;
+
+				field = struct_definition_get_field_from_index(file_stream->stream.stream_packet_context, len_index);
+				assert(field->declaration->id == CTF_TYPE_INTEGER);
+				defint = container_of(field, struct definition_integer, p);
+				assert(defint->declaration->signedness == FALSE);
+				packet_index.timestamp_begin = defint->value._unsigned;
+			}
+
+			/* read timestamp end from header */
+			len_index = struct_declaration_lookup_field_index(file_stream->stream.stream_packet_context->declaration, g_quark_from_static_string("timestamp_end"));
+			if (len_index >= 0) {
+				struct definition_integer *defint;
+				struct definition *field;
+
+				field = struct_definition_get_field_from_index(file_stream->stream.stream_packet_context, len_index);
+				assert(field->declaration->id == CTF_TYPE_INTEGER);
+				defint = container_of(field, struct definition_integer, p);
+				assert(defint->declaration->signedness == FALSE);
+				packet_index.timestamp_end = defint->value._unsigned;
+			}
+		} else {
+			/* Use file size for packet size */
+			packet_index.content_size = filestats.st_size * CHAR_BIT;
+			/* Use content size if non-zero, else file size */
+			packet_index.packet_size = packet_index.content_size ? : filestats.st_size * CHAR_BIT;
+		}
+
+		/* Validate content size and packet size values */
+		if (packet_index.content_size > packet_index.packet_size) {
+			fprintf(stdout, "[error] Content size (%zu bits) is larger than packet size (%zu bits).\n",
+				packet_index.content_size, packet_index.packet_size);
+			return -EINVAL;
+		}
+
+		if (packet_index.packet_size > (filestats.st_size - packet_index.offset) * CHAR_BIT) {
+			fprintf(stdout, "[error] Packet size (%zu bits) is larger than remaining file size (%zu bits).\n",
+				packet_index.content_size, (filestats.st_size - packet_index.offset) * CHAR_BIT);
+			return -EINVAL;
+		}
+
+		/* Save position after header and context */
+		packet_index.data_offset = pos->offset;
+
+		/* add index to packet array */
+		g_array_append_val(file_stream->pos.packet_index, packet_index);
+
+		pos->mmap_offset += packet_index.packet_size / CHAR_BIT;
+	}
+
+	/* Move pos back to beginning of file */
+	ctf_move_pos_slow(pos, 0, SEEK_SET);	/* position for write */
+
+	return 0;
+}
+
+static
+int create_trace_definitions(struct ctf_trace *td, struct ctf_stream *stream)
+{
+	int ret;
+
+	if (td->packet_header_decl) {
+		struct definition *definition =
+			td->packet_header_decl->p.definition_new(&td->packet_header_decl->p,
+				stream->parent_def_scope, 0, 0, "trace.packet.header");
+		if (!definition) {
+			ret = -EINVAL;
+			goto error;
+		}
+		stream->trace_packet_header = 
+			container_of(definition, struct definition_struct, p);
+		stream->parent_def_scope = stream->trace_packet_header->p.scope;
+	}
+
+	return 0;
+
+error:
+	return ret;
+}
+
+/*
+ * Note: many file streams can inherit from the same stream class
+ * description (metadata).
+ */
+static
+int ctf_open_file_stream_read(struct ctf_trace *td, const char *path, int flags)
+{
+	int ret;
+	struct ctf_file_stream *file_stream;
+
+	ret = openat(td->dirfd, path, flags);
+	if (ret < 0)
+		goto error;
+	file_stream = g_new0(struct ctf_file_stream, 1);
+	ctf_init_pos(&file_stream->pos, ret, flags);
+	ret = create_trace_definitions(td, &file_stream->stream);
+	if (ret)
+		goto error_def;
+	ret = create_stream_packet_index(td, file_stream);
+	if (ret)
+		goto error_index;
+	/* Add stream file to stream class */
+	g_ptr_array_add(file_stream->stream.stream_class->files, file_stream);
+	return 0;
+
+error_index:
+	if (file_stream->stream.trace_packet_header)
+		definition_unref(&file_stream->stream.trace_packet_header->p);
+error_def:
+	ctf_fini_pos(&file_stream->pos);
+	close(file_stream->pos.fd);
+	g_free(file_stream);
+error:
+	return ret;
+}
+
+static
+int ctf_open_trace_read(struct ctf_trace *td, const char *path, int flags)
+{
+	int ret;
+	struct dirent *dirent;
+	struct dirent *diriter;
+	size_t dirent_len;
+
+	td->flags = flags;
+
+	/* Open trace directory */
+	td->dir = opendir(path);
+	if (!td->dir) {
+		fprintf(stdout, "[error] Unable to open trace directory.\n");
+		ret = -ENOENT;
+		goto error;
+	}
+
+	td->dirfd = open(path, 0);
+	if (td->dirfd < 0) {
+		fprintf(stdout, "[error] Unable to open trace directory file descriptor.\n");
+		ret = -ENOENT;
+		goto error_dirfd;
+	}
+
+	/*
+	 * Keep the metadata file separate.
+	 */
+
+	ret = ctf_open_trace_metadata_read(td);
+	if (ret) {
+		goto error_metadata;
+	}
+
+	/*
+	 * Open each stream: for each file, try to open, check magic
+	 * number, and get the stream ID to add to the right location in
+	 * the stream array.
+	 */
+
+	dirent_len = offsetof(struct dirent, d_name) +
+			fpathconf(td->dirfd, _PC_NAME_MAX) + 1;
+
+	dirent = malloc(dirent_len);
+
+	for (;;) {
+		ret = readdir_r(td->dir, dirent, &diriter);
+		if (ret) {
+			fprintf(stdout, "[error] Readdir error.\n");
+			goto readdir_error;
+		}
+		if (!diriter)
+			break;
+		/* Ignore hidden files, ., .. and metadata. */
+		if (!strncmp(diriter->d_name, ".", 1)
+				|| !strcmp(diriter->d_name, "..")
+				|| !strcmp(diriter->d_name, "metadata"))
+			continue;
+		ret = ctf_open_file_stream_read(td, diriter->d_name, flags);
+		if (ret) {
+			fprintf(stdout, "[error] Open file stream error.\n");
+			goto readdir_error;
+		}
+	}
+
+	free(dirent);
+	return 0;
+
+readdir_error:
+	free(dirent);
+error_metadata:
+	close(td->dirfd);
+error_dirfd:
+	closedir(td->dir);
+error:
+	return ret;
+}
+
+static
+struct trace_descriptor *ctf_open_trace(const char *path, int flags)
+{
+	struct ctf_trace *td;
+	int ret;
+
+	td = g_new0(struct ctf_trace, 1);
+
+	switch (flags & O_ACCMODE) {
+	case O_RDONLY:
+		if (!path) {
+			fprintf(stdout, "[error] Path missing for input CTF trace.\n");
+			goto error;
+		}
+		ret = ctf_open_trace_read(td, path, flags);
+		if (ret)
+			goto error;
+		break;
+	case O_RDWR:
+		fprintf(stdout, "[error] Opening CTF traces for output is not supported yet.\n");
+		goto error;
+	default:
+		fprintf(stdout, "[error] Incorrect open flags.\n");
+		goto error;
+	}
+
+	return &td->parent;
+error:
+	g_free(td);
+	return NULL;
+}
+
+static
+void ctf_close_file_stream(struct ctf_file_stream *file_stream)
+{
+	ctf_fini_pos(&file_stream->pos);
+	close(file_stream->pos.fd);
+}
+
+static
+void ctf_close_trace(struct trace_descriptor *tdp)
+{
+	struct ctf_trace *td = container_of(tdp, struct ctf_trace, parent);
+	int i;
+
+	if (td->streams) {
+		for (i = 0; i < td->streams->len; i++) {
+			struct ctf_stream_class *stream;
+			int j;
+
+			stream = g_ptr_array_index(td->streams, i);
+			if (!stream)
+				continue;
+			for (j = 0; j < stream->files->len; j++) {
+				struct ctf_file_stream *file_stream;
+				file_stream = g_ptr_array_index(stream->files, j);
+				ctf_close_file_stream(file_stream);
+			}
+
+		}
+		g_ptr_array_free(td->streams, TRUE);
+	}
+	closedir(td->dir);
+	g_free(td);
+}
+
+void __attribute__((constructor)) ctf_init(void)
 {
 	int ret;