X-Git-Url: http://git.efficios.com/?p=babeltrace.git;a=blobdiff_plain;f=formats%2Fctf%2Fctf.c;h=0c635d5701a987542409c8c1fcb8346e4e210832;hp=9b2f0fbf65dc195b426433de7596f6c18850aba2;hb=0f980a3595f61930659e392b1248c59490dd5a22;hpb=ff00cad2a14ea6dad073761b3dbb4aaa259723d0

diff --git a/formats/ctf/ctf.c b/formats/ctf/ctf.c
index 9b2f0fbf..0c635d57 100644
--- a/formats/ctf/ctf.c
+++ b/formats/ctf/ctf.c
@@ -20,6 +20,9 @@
 #include <babeltrace/ctf/types.h>
 #include <babeltrace/ctf/metadata.h>
 #include <babeltrace/babeltrace.h>
+#include <inttypes.h>
+#include <uuid/uuid.h>
+#include <sys/mman.h>
 #include <errno.h>
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -29,11 +32,17 @@
 #include <unistd.h>
 #include <stdlib.h>
 
-
 #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.
+ */
+#define MAX_PACKET_HEADER_LEN	getpagesize()
+#define UUID_LEN 16	/* uuid by value len */
+
 extern int yydebug;
 
 struct trace_descriptor {
@@ -69,6 +78,35 @@ static struct format ctf_format = {
 	.close_trace = ctf_close_trace,
 };
 
+void move_pos_slow(struct stream_pos *pos, size_t offset)
+{
+	int ret;
+
+	/*
+	 * The caller should never ask for move_pos across packets,
+	 * except to get exactly at the beginning of the next packet.
+	 */
+	assert(pos->offset + offset == pos->content_size);
+
+	if (pos->base) {
+		/* unmap old base */
+		ret = munmap(pos->base, pos->packet_size);
+		if (ret) {
+			fprintf(stdout, "Unable to unmap old base: %s.\n",
+				strerror(errno));
+			assert(0);
+		}
+	}
+
+	pos->mmap_offset += pos->packet_size / CHAR_BIT;
+	/* map new base. Need mapping length from header. */
+	pos->base = mmap(NULL, MAX_PACKET_HEADER_LEN, PROT_READ,
+			 MAP_PRIVATE, pos->fd, pos->mmap_offset);
+	pos->content_size = 0;	/* Unknown at this point */
+	pos->packet_size = 0;	/* Unknown at this point */
+
+}
+
 /*
  * TODO: for now, we treat the metadata file as a simple text file
  * (without any header nor packets nor padding).
@@ -80,17 +118,17 @@ int ctf_open_trace_metadata_read(struct trace_descriptor *td)
 	FILE *fp;
 	int ret = 0;
 
-	td->ctf_trace.metadata.fd = openat(td->ctf_trace.dirfd,
+	td->ctf_trace.metadata.pos.fd = openat(td->ctf_trace.dirfd,
 			"metadata", O_RDONLY);
-	if (td->ctf_trace.metadata.fd < 0) {
+	if (td->ctf_trace.metadata.pos.fd < 0) {
 		fprintf(stdout, "Unable to open metadata.\n");
-		return td->ctf_trace.metadata.fd;
+		return td->ctf_trace.metadata.pos.fd;
 	}
 
 	if (babeltrace_debug)
 		yydebug = 1;
 
-	fp = fdopen(td->ctf_trace.metadata.fd, "r");
+	fp = fdopen(td->ctf_trace.metadata.pos.fd, "r");
 	if (!fp) {
 		fprintf(stdout, "Unable to open metadata stream.\n");
 		ret = -errno;
@@ -133,7 +171,211 @@ end:
 end_scanner_alloc:
 	fclose(fp);
 end_stream:
-	close(td->ctf_trace.metadata.fd);
+	close(td->ctf_trace.metadata.pos.fd);
+	return ret;
+}
+
+
+static
+int create_stream_packet_index(struct trace_descriptor *td,
+			       struct ctf_file_stream *file_stream)
+{
+	struct ctf_stream *stream;
+	int len_index;
+	struct 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;
+
+	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);
+			if (ret) {
+				fprintf(stdout, "Unable to unmap old base: %s.\n",
+					strerror(errno));
+				return ret;
+			}
+		}
+		/* map new base. Need mapping length from header. */
+		pos->base = mmap(NULL, MAX_PACKET_HEADER_LEN, PROT_READ,
+				 MAP_PRIVATE, pos->fd, pos->mmap_offset);
+		pos->content_size = 0;	/* Unknown at this point */
+		pos->packet_size = 0;	/* Unknown at this point */
+		pos->offset = 0;	/* Position of the packet header */
+
+		/* read and check header, set stream id (and check) */
+		if (td->ctf_trace.packet_header) {
+			/* Read packet header */
+			td->ctf_trace.packet_header->p.declaration->copy(NULL, NULL,
+				pos, &ctf_format, &td->ctf_trace.packet_header->p);
+
+			len_index = struct_declaration_lookup_field_index(td->ctf_trace.packet_header->declaration, g_quark_from_static_string("magic"));
+			if (len_index >= 0) {
+				struct definition_integer *defint;
+				struct field *field;
+
+				field = struct_definition_get_field_from_index(td->ctf_trace.packet_header, len_index);
+				assert(field->definition->declaration->id == CTF_TYPE_INTEGER);
+				defint = container_of(field->definition, struct definition_integer, p);
+				assert(defint->declaration->signedness == FALSE);
+				if (defint->value._unsigned != CTF_MAGIC) {
+					fprintf(stdout, "[error] Invalid magic number %" PRIX64 ".\n",
+							defint->value._unsigned);
+					return -EINVAL;
+				}
+			}
+
+			/* check uuid */
+			len_index = struct_declaration_lookup_field_index(td->ctf_trace.packet_header->declaration, g_quark_from_static_string("trace_uuid"));
+			if (len_index >= 0) {
+				struct definition_array *defarray;
+				struct field *field;
+				uint64_t i;
+				uint8_t uuidval[UUID_LEN];
+
+
+				field = struct_definition_get_field_from_index(td->ctf_trace.packet_header, len_index);
+				assert(field->definition->declaration->id == CTF_TYPE_ARRAY);
+				defarray = container_of(field->definition, struct definition_array, p);
+				assert(defarray->declaration->len == 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->ctf_trace.uuid, uuidval);
+				if (ret) {
+					fprintf(stdout, "[error] Unique Universal Identifiers do not match.\n");
+					return -EINVAL;
+				}
+			}
+
+
+			len_index = struct_declaration_lookup_field_index(td->ctf_trace.packet_header->declaration, g_quark_from_static_string("stream_id"));
+			if (len_index >= 0) {
+				struct definition_integer *defint;
+				struct field *field;
+
+				field = struct_definition_get_field_from_index(td->ctf_trace.packet_header, len_index);
+				assert(field->definition->declaration->id == CTF_TYPE_INTEGER);
+				defint = container_of(field->definition, 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->ctf_trace.streams->len) {
+				fprintf(stdout, "[error] Stream %" PRIu64 " is not declared in metadata.\n", stream_id);
+				return -EINVAL;
+			}
+			stream = g_ptr_array_index(td->ctf_trace.streams, stream_id);
+			if (!stream) {
+				fprintf(stdout, "[error] Stream %" PRIu64 " is not declared in metadata.\n", stream_id);
+				return -EINVAL;
+			}
+			file_stream->stream = stream;
+		}
+		first_packet = 0;
+
+		/* Read packet context */
+		stream->packet_context->p.declaration->copy(NULL, NULL,
+				pos, &ctf_format, &stream->packet_context->p);
+
+		/* read content size from header */
+		len_index = struct_declaration_lookup_field_index(stream->packet_context->declaration, g_quark_from_static_string("content_size"));
+		if (len_index >= 0) {
+			struct definition_integer *defint;
+			struct field *field;
+
+			field = struct_definition_get_field_from_index(stream->packet_context, len_index);
+			assert(field->definition->declaration->id == CTF_TYPE_INTEGER);
+			defint = container_of(field->definition, struct definition_integer, p);
+			assert(defint->declaration->signedness == FALSE);
+			pos->content_size = defint->value._unsigned;
+		} else {
+			/* Use file size for packet size */
+			pos->content_size = filestats.st_size * CHAR_BIT;
+		}
+
+		/* read packet size from header */
+		len_index = struct_declaration_lookup_field_index(stream->packet_context->declaration, g_quark_from_static_string("packet_size"));
+		if (len_index >= 0) {
+			struct definition_integer *defint;
+			struct field *field;
+
+			field = struct_definition_get_field_from_index(stream->packet_context, len_index);
+			assert(field->definition->declaration->id == CTF_TYPE_INTEGER);
+			defint = container_of(field->definition, struct definition_integer, p);
+			assert(defint->declaration->signedness == FALSE);
+			pos->packet_size = defint->value._unsigned;
+		} else {
+			/* Use content size if non-zero, else file size */
+			pos->packet_size = pos->content_size ? : filestats.st_size * CHAR_BIT;
+		}
+
+		packet_index.offset = pos->mmap_offset;
+		packet_index.content_size = pos->content_size;
+		packet_index.packet_size = pos->packet_size;
+		/* add index to packet array */
+		g_array_append_val(file_stream->pos.packet_index, packet_index);
+
+		pos->mmap_offset += pos->packet_size / CHAR_BIT;
+	}
+
+	return 0;
+}
+
+/*
+ * Note: many file streams can inherit from the same stream class
+ * description (metadata).
+ */
+static
+int ctf_open_file_stream_read(struct trace_descriptor *td, const char *path, int flags)
+{
+	int ret;
+	struct ctf_file_stream *file_stream;
+
+	ret = openat(td->ctf_trace.dirfd, path, flags);
+	if (ret < 0)
+		goto error;
+	file_stream = g_new0(struct ctf_file_stream, 1);
+	file_stream->pos.fd = ret;
+	file_stream->pos.packet_index = g_array_new(FALSE, TRUE,
+						sizeof(struct packet_index));
+	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->files, file_stream);
+	return 0;
+
+error_index:
+	(void) g_array_free(file_stream->pos.packet_index, TRUE);
+	close(file_stream->pos.fd);
+	g_free(file_stream);
+error:
 	return ret;
 }
 
@@ -161,6 +403,9 @@ int ctf_open_trace_read(struct trace_descriptor *td, const char *path, int flags
 		ret = -ENOENT;
 		goto error_dirfd;
 	}
+
+	td->ctf_trace.streams = g_ptr_array_new();
+
 	/*
 	 * Keep the metadata file separate.
 	 */
@@ -186,7 +431,6 @@ int ctf_open_trace_read(struct trace_descriptor *td, const char *path, int flags
 		if (ret) {
 			fprintf(stdout, "Readdir error.\n");
 			goto readdir_error;
-			
 		}
 		if (!diriter)
 			break;
@@ -194,6 +438,7 @@ int ctf_open_trace_read(struct trace_descriptor *td, const char *path, int flags
 				|| !strcmp(diriter->d_name, "..")
 				|| !strcmp(diriter->d_name, "metadata"))
 			continue;
+		/* TODO: open file stream */
 	}
 
 	free(dirent);
@@ -202,6 +447,7 @@ int ctf_open_trace_read(struct trace_descriptor *td, const char *path, int flags
 readdir_error:
 	free(dirent);
 error_metadata:
+	g_ptr_array_free(td->ctf_trace.streams, TRUE);
 	close(td->ctf_trace.dirfd);
 error_dirfd:
 	closedir(td->ctf_trace.dir);
@@ -262,8 +508,32 @@ error:
 	return NULL;
 }
 
+static
+void ctf_close_file_stream(struct ctf_file_stream *file_stream)
+{
+	(void) g_array_free(file_stream->pos.packet_index, TRUE);
+	close(file_stream->pos.fd);
+}
+
 void ctf_close_trace(struct trace_descriptor *td)
 {
+	int i;
+
+	if (td->ctf_trace.streams) {
+		for (i = 0; i < td->ctf_trace.streams->len; i++) {
+			struct ctf_stream *stream;
+			int j;
+
+			stream = g_ptr_array_index(td->ctf_trace.streams, i);
+			for (j = 0; j < stream->files->len; j++) {
+				struct ctf_file_stream *file_stream;
+				file_stream = g_ptr_array_index(td->ctf_trace.streams, j);
+				ctf_close_file_stream(file_stream);
+			}
+
+		}
+		g_ptr_array_free(td->ctf_trace.streams, TRUE);
+	}
 	closedir(td->ctf_trace.dir);
 	g_free(td);
 }