X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=src%2Fnetwork-live.c;fp=src%2Fnetwork-live.c;h=a0113f5efd3995126cfeb242468c220e714b7b49;hb=b1acd2b342a35dc6c5a8036fb0280321203e89b7;hp=0000000000000000000000000000000000000000;hpb=a18dc7c24b4ac751c46a96198aebcbb1dcd4cdd6;p=lttngtop.git

diff --git a/src/network-live.c b/src/network-live.c
new file mode 100644
index 0000000..a0113f5
--- /dev/null
+++ b/src/network-live.c
@@ -0,0 +1,853 @@
+/*
+ * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
+ *                      Mathieu Desnoyers <mathieu.desnoyers@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 <sys/socket.h>
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+
+#include "lttng-viewer.h"
+#include "lttng-index.h"
+#include "network-live.h"
+
+#include <babeltrace/babeltrace.h>
+#include <babeltrace/ctf/events.h>
+#include <babeltrace/ctf/callbacks.h>
+#include <babeltrace/ctf/iterator.h>
+
+/* for packet_index */
+#include <babeltrace/ctf/types.h>
+
+#include <babeltrace/ctf/metadata.h>
+#include <babeltrace/ctf-text/types.h>
+#include <babeltrace/ctf/events-internal.h>
+
+/*
+ * Memory allocation zeroed
+ */
+#define zmalloc(x) calloc(1, x)
+/* FIXME : completely arbitrary */
+#define mmap_size 524288
+
+static int control_sock;
+struct live_session *session;
+
+struct viewer_stream {
+	uint64_t id;
+	uint64_t ctf_trace_id;
+	void *mmap_base;
+	int fd;
+	int metadata_flag;
+	int first_read;
+	char path[PATH_MAX];
+};
+
+struct live_session {
+	struct viewer_stream *streams;
+	uint64_t live_timer_interval;
+	uint64_t stream_count;
+};
+
+static
+int connect_viewer(char *hostname)
+{
+	struct hostent *host;
+	struct sockaddr_in server_addr;
+	int ret;
+
+	host = gethostbyname(hostname);
+	if (!host) {
+		ret = -1;
+		goto end;
+	}
+
+	if ((control_sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
+		perror("Socket");
+		ret = -1;
+		goto end;
+	}
+
+	server_addr.sin_family = AF_INET;
+	server_addr.sin_port = htons(5344);
+	server_addr.sin_addr = *((struct in_addr *) host->h_addr);
+	bzero(&(server_addr.sin_zero), 8);
+
+	if (connect(control_sock, (struct sockaddr *) &server_addr,
+				sizeof(struct sockaddr)) == -1) {
+		perror("Connect");
+		ret = -1;
+		goto end;
+	}
+
+	server_addr.sin_family = AF_INET;
+	server_addr.sin_port = htons(5345);
+	server_addr.sin_addr = *((struct in_addr *) host->h_addr);
+	bzero(&(server_addr.sin_zero), 8);
+
+	ret = 0;
+
+end:
+	return ret;
+}
+
+static
+int establish_connection(void)
+{
+	struct lttng_viewer_cmd cmd;
+	struct lttng_viewer_connect connect;
+	int ret;
+
+	cmd.cmd = htobe32(VIEWER_CONNECT);
+	cmd.data_size = sizeof(connect);
+	cmd.cmd_version = 0;
+
+	connect.major = htobe32(2);
+	connect.minor = htobe32(4);
+	connect.type = htobe32(VIEWER_CLIENT_COMMAND);
+
+	do {
+		ret = send(control_sock, &cmd, sizeof(cmd), 0);
+	} while (ret < 0 && errno == EINTR);
+	if (ret < 0) {
+		fprintf(stderr, "Error sending cmd\n");
+		goto error;
+	}
+	do {
+		ret = send(control_sock, &connect, sizeof(connect), 0);
+	} while (ret < 0 && errno == EINTR);
+	if (ret < 0) {
+		fprintf(stderr, "Error sending version\n");
+		goto error;
+	}
+
+	do {
+		ret = recv(control_sock, &connect, sizeof(connect), 0);
+	} while (ret < 0 && errno == EINTR);
+	if (ret < 0) {
+		fprintf(stderr, "Error receiving version\n");
+		goto error;
+	}
+	fprintf(stderr, "  - Received viewer session ID : %" PRIu64 "\n",
+			be64toh(connect.viewer_session_id));
+	fprintf(stderr, "  - Received version : %u.%u\n", be32toh(connect.major),
+			be32toh(connect.minor));
+
+	ret = 0;
+
+error:
+	return ret;
+}
+
+int list_sessions(void)
+{
+	struct lttng_viewer_cmd cmd;
+	struct lttng_viewer_list_sessions list;
+	struct lttng_viewer_session lsession;
+	int i, ret;
+	int first_session = 0;
+
+	cmd.cmd = htobe32(VIEWER_LIST_SESSIONS);
+	cmd.data_size = 0;
+	cmd.cmd_version = 0;
+
+	do {
+		ret = send(control_sock, &cmd, sizeof(cmd), 0);
+	} while (ret < 0 && errno == EINTR);
+	if (ret < 0) {
+		fprintf(stderr, "Error sending cmd\n");
+		goto error;
+	}
+
+	do {
+		ret = recv(control_sock, &list, sizeof(list), 0);
+	} while (ret < 0 && errno == EINTR);
+	if (ret < 0) {
+		fprintf(stderr, "Error receiving session list\n");
+		goto error;
+	}
+
+	fprintf(stderr, "  - %u active session(s)\n", be32toh(list.sessions_count));
+	for (i = 0; i < be32toh(list.sessions_count); i++) {
+		do {
+			ret = recv(control_sock, &lsession, sizeof(lsession), 0);
+		} while (ret < 0 && errno == EINTR);
+		if (ret < 0) {
+			fprintf(stderr, "Error receiving session\n");
+			goto error;
+		}
+		fprintf(stderr, "    - %" PRIu64 " : %s on host %s (timer = %u, "
+				"%u client(s) connected)\n",
+				be64toh(lsession.id), lsession.session_name,
+				lsession.hostname, be32toh(lsession.live_timer),
+				be32toh(lsession.clients));
+		if (first_session <= 0) {
+			first_session = be64toh(lsession.id);
+		}
+	}
+
+	/* I know, type mismatch */
+	ret = (int) first_session;
+
+error:
+	return ret;
+}
+
+int write_index_header(int fd)
+{
+	struct lttng_packet_index_file_hdr hdr;
+	int ret;
+
+	memcpy(hdr.magic, INDEX_MAGIC, sizeof(hdr.magic));
+	hdr.index_major = htobe32(INDEX_MAJOR);
+	hdr.index_minor = htobe32(INDEX_MINOR);
+
+	do {
+		ret = write(fd, &hdr, sizeof(hdr));
+	} while (ret < 0 && errno == EINTR);
+	if (ret < 0) {
+		perror("write index header");
+		goto error;
+	}
+
+error:
+	return ret;
+}
+
+int attach_session(int id)
+{
+	struct lttng_viewer_cmd cmd;
+	struct lttng_viewer_attach_session_request rq;
+	struct lttng_viewer_attach_session_response rp;
+	struct lttng_viewer_stream stream;
+	int ret, i;
+
+	cmd.cmd = htobe32(VIEWER_ATTACH_SESSION);
+	cmd.data_size = sizeof(rq);
+	cmd.cmd_version = 0;
+
+	rq.session_id = htobe64(id);
+	//rq.seek = htobe32(VIEWER_SEEK_BEGINNING);
+	rq.seek = htobe32(VIEWER_SEEK_LAST);
+
+	do {
+		ret = send(control_sock, &cmd, sizeof(cmd), 0);
+	} while (ret < 0 && errno == EINTR);
+	if (ret < 0) {
+		fprintf(stderr, "Error sending cmd\n");
+		goto error;
+	}
+	do {
+		ret = send(control_sock, &rq, sizeof(rq), 0);
+	} while (ret < 0 && errno == EINTR);
+	if (ret < 0) {
+		fprintf(stderr, "Error sending attach request\n");
+		goto error;
+	}
+
+	do {
+		ret = recv(control_sock, &rp, sizeof(rp), 0);
+	} while (ret < 0 && errno == EINTR);
+	if (ret < 0) {
+		fprintf(stderr, "Error receiving attach response\n");
+		goto error;
+	}
+	fprintf(stderr, "  - session attach response : %u\n", be32toh(rp.status));
+	if (be32toh(rp.status) != VIEWER_ATTACH_OK) {
+		ret = 1;
+		goto end;
+	}
+
+	session->stream_count = be32toh(rp.streams_count);
+	fprintf(stderr, "  - Waiting for %" PRIu64 " streams\n", session->stream_count);
+	session->streams = zmalloc(session->stream_count *
+			sizeof(struct viewer_stream));
+	if (!session->streams) {
+		ret = -1;
+		goto error;
+	}
+
+	for (i = 0; i < be32toh(rp.streams_count); i++) {
+		do {
+			ret = recv(control_sock, &stream, sizeof(stream), 0);
+		} while (ret < 0 && errno == EINTR);
+		if (ret < 0) {
+			fprintf(stderr, "Error receiving stream\n");
+			goto error;
+		}
+		fprintf(stderr, "    - stream %" PRIu64 " : %s/%s\n",
+				be64toh(stream.id), stream.path_name,
+				stream.channel_name);
+		session->streams[i].id = be64toh(stream.id);
+
+		session->streams[i].ctf_trace_id = be64toh(stream.ctf_trace_id);
+		session->streams[i].first_read = 1;
+		session->streams[i].mmap_base = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE,
+				MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+		if (session->streams[i].mmap_base == MAP_FAILED) {
+			fprintf(stderr, "mmap error\n");
+			ret = -1;
+			goto error;
+		}
+
+		if (be32toh(stream.metadata_flag)) {
+			session->streams[i].metadata_flag = 1;
+			unlink("testlivetrace");
+			mkdir("testlivetrace", S_IRWXU | S_IRWXG);
+			snprintf(session->streams[i].path,
+					sizeof(session->streams[i].path),
+					"testlivetrace/%s",
+					stream.channel_name);
+			ret = open(session->streams[i].path,
+					O_WRONLY | O_CREAT | O_TRUNC,
+					S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
+			if (ret < 0) {
+				goto error;
+			}
+			session->streams[i].fd = ret;
+		}
+	}
+	ret = 0;
+
+end:
+error:
+	return ret;
+}
+
+#if 0
+/* useful debug */
+static
+void dump_packet_index(struct lttng_packet_index *index)
+{
+	printf("      - index : %lu, %lu, %lu, %lu, %lu, %lu, %lu\n",
+			be64toh(index->offset),
+			be64toh(index->packet_size),
+			be64toh(index->content_size),
+			be64toh(index->timestamp_begin),
+			be64toh(index->timestamp_end),
+			be64toh(index->events_discarded),
+			be64toh(index->stream_id));
+}
+#endif
+
+static
+int get_data_packet(int id, uint64_t offset,
+		uint64_t len)
+{
+	struct lttng_viewer_cmd cmd;
+	struct lttng_viewer_get_packet rq;
+	struct lttng_viewer_trace_packet rp;
+	int ret;
+
+	cmd.cmd = htobe32(VIEWER_GET_PACKET);
+	cmd.data_size = sizeof(rq);
+	cmd.cmd_version = 0;
+
+	rq.stream_id = htobe64(session->streams[id].id);
+	/* Already in big endian. */
+	rq.offset = offset;
+	rq.len = htobe32(len);
+	fprintf(stderr, "      - get_packet ");
+
+	do {
+		ret = send(control_sock, &cmd, sizeof(cmd), 0);
+	} while (ret < 0 && errno == EINTR);
+	if (ret < 0) {
+		fprintf(stderr, "Error sending cmd\n");
+		goto error;
+	}
+	do {
+		ret = send(control_sock, &rq, sizeof(rq), 0);
+	} while (ret < 0 && errno == EINTR);
+	if (ret < 0) {
+		fprintf(stderr, "Error sending get_data_packet request\n");
+		goto error;
+	}
+	do {
+		ret = recv(control_sock, &rp, sizeof(rp), 0);
+	} while (ret < 0 && errno == EINTR);
+	if (ret < 0) {
+		fprintf(stderr, "Error receiving data response\n");
+		goto error;
+	}
+	rp.flags = be32toh(rp.flags);
+
+	switch (be32toh(rp.status)) {
+	case VIEWER_GET_PACKET_OK:
+		fprintf(stderr, "OK\n");
+		break;
+	case VIEWER_GET_PACKET_RETRY:
+		fprintf(stderr, "RETRY\n");
+		ret = -1;
+		goto end;
+	case VIEWER_GET_PACKET_ERR:
+		if (rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
+			fprintf(stderr, "NEW_METADATA\n");
+			ret = 0;
+			goto end;
+		}
+		fprintf(stderr, "ERR\n");
+		ret = -1;
+		goto end;
+	default:
+		fprintf(stderr, "UNKNOWN\n");
+		ret = -1;
+		goto end;
+	}
+
+	len = be32toh(rp.len);
+	fprintf(stderr, "        - writing %" PRIu64" bytes to tracefile\n", len);
+	if (len <= 0) {
+		goto end;
+	}
+
+	if (len > mmap_size) {
+		fprintf(stderr, "mmap_size not big enough\n");
+		ret = -1;
+		goto error;
+	}
+
+	do {
+		ret = recv(control_sock, session->streams[id].mmap_base, len, MSG_WAITALL);
+	} while (ret < 0 && errno == EINTR);
+	if (ret < 0) {
+		fprintf(stderr, "Error receiving trace packet\n");
+		goto error;
+	}
+
+end:
+error:
+	return ret;
+}
+
+/*
+ * Return number of metadata bytes written or a negative value on error.
+ */
+static
+int get_new_metadata(int id)
+{
+	struct lttng_viewer_cmd cmd;
+	struct lttng_viewer_get_metadata rq;
+	struct lttng_viewer_metadata_packet rp;
+	int ret;
+	uint64_t i;
+	char *data = NULL;
+	uint64_t len = 0;
+	int metadata_stream_id = -1;
+
+	cmd.cmd = htobe32(VIEWER_GET_METADATA);
+	cmd.data_size = sizeof(rq);
+	cmd.cmd_version = 0;
+
+	/* find the metadata stream for this ctf_trace */
+	for (i = 0; i < session->stream_count; i++) {
+		if (session->streams[i].metadata_flag &&
+				session->streams[i].ctf_trace_id ==
+				session->streams[id].ctf_trace_id) {
+			metadata_stream_id = i;
+			break;
+		}
+	}
+	if (metadata_stream_id < 0) {
+		fprintf(stderr, "No metadata stream found\n");
+		ret = -1;
+		goto error;
+	}
+
+	rq.stream_id = htobe64(session->streams[metadata_stream_id].id);
+	fprintf(stderr, "      - get_metadata ");
+
+	do {
+		ret = send(control_sock, &cmd, sizeof(cmd), 0);
+	} while (ret < 0 && errno == EINTR);
+	if (ret < 0) {
+		fprintf(stderr, "Error sending cmd\n");
+		goto error;
+	}
+	do {
+		ret = send(control_sock, &rq, sizeof(rq), 0);
+	} while (ret < 0 && errno == EINTR);
+	if (ret < 0) {
+		fprintf(stderr, "Error sending get_metadata request\n");
+		goto error;
+	}
+	do {
+		ret = recv(control_sock, &rp, sizeof(rp), 0);
+	} while (ret < 0 && errno == EINTR);
+	if (ret < 0) {
+		fprintf(stderr, "Error receiving metadata response\n");
+		goto error;
+	}
+	switch (be32toh(rp.status)) {
+		case VIEWER_METADATA_OK:
+			fprintf(stderr, "OK\n");
+			break;
+		case VIEWER_NO_NEW_METADATA:
+			fprintf(stderr, "NO NEW\n");
+			ret = -1;
+			goto end;
+		case VIEWER_METADATA_ERR:
+			fprintf(stderr, "ERR\n");
+			ret = -1;
+			goto end;
+		default:
+			fprintf(stderr, "UNKNOWN\n");
+			ret = -1;
+			goto end;
+	}
+
+	len = be64toh(rp.len);
+	fprintf(stderr, "        - writing %" PRIu64" bytes to metadata\n", len);
+	if (len <= 0) {
+		goto end;
+	}
+
+	data = zmalloc(len);
+	if (!data) {
+		perror("relay data zmalloc");
+		goto error;
+	}
+	do {
+		ret = recv(control_sock, data, len, MSG_WAITALL);
+	} while (ret < 0 && errno == EINTR);
+	if (ret < 0) {
+		fprintf(stderr, "Error receiving trace packet\n");
+		free(data);
+		goto error;
+	}
+	do {
+		ret = write(session->streams[metadata_stream_id].fd, data, len);
+	} while (ret < 0 && errno == EINTR);
+	if (ret < 0) {
+		free(data);
+		goto error;
+	}
+	free(data);
+
+	/* FIXME : bad */
+	ret = (int) len;
+end:
+error:
+	return ret;
+}
+
+/*
+ * Get one index for a stream.
+ */
+int get_next_index(int id, struct packet_index *index)
+{
+	struct lttng_viewer_cmd cmd;
+	struct lttng_viewer_get_next_index rq;
+	struct lttng_viewer_index rp;
+	int ret;
+
+	cmd.cmd = htobe32(VIEWER_GET_NEXT_INDEX);
+	cmd.data_size = sizeof(rq);
+	cmd.cmd_version = 0;
+
+	fprintf(stderr, "  - get next index for stream %" PRIu64 "\n",
+			session->streams[id].id);
+	rq.stream_id = htobe64(session->streams[id].id);
+
+retry:
+	do {
+		ret = send(control_sock, &cmd, sizeof(cmd), 0);
+	} while (ret < 0 && errno == EINTR);
+	if (ret < 0) {
+		fprintf(stderr, "Error sending cmd\n");
+		goto error;
+	}
+	do {
+		ret = send(control_sock, &rq, sizeof(rq), 0);
+	} while (ret < 0 && errno == EINTR);
+	if (ret < 0) {
+		fprintf(stderr, "Error sending get_next_index request\n");
+		goto error;
+	}
+	do {
+		ret = recv(control_sock, &rp, sizeof(rp), 0);
+	} while (ret < 0 && errno == EINTR);
+	if (ret < 0) {
+		fprintf(stderr, "Error receiving index response\n");
+		goto error;
+	}
+	fprintf(stderr, "    - reply : %u ", be32toh(rp.status));
+
+	rp.flags = be32toh(rp.flags);
+
+	switch (be32toh(rp.status)) {
+	case VIEWER_INDEX_INACTIVE:
+		fprintf(stderr, "(INACTIVE)\n");
+		memset(index, 0, sizeof(struct packet_index));
+		index->timestamp_end = be64toh(rp.timestamp_end);
+		break;
+	case VIEWER_INDEX_OK:
+		fprintf(stderr, "(OK), need metadata update : %u\n",
+				rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA);
+		index->offset = be64toh(rp.offset);
+		index->packet_size = be64toh(rp.packet_size);
+		index->content_size = be64toh(rp.content_size);
+		index->timestamp_begin = be64toh(rp.timestamp_begin);
+		index->timestamp_end = be64toh(rp.timestamp_end);
+		index->events_discarded = be64toh(rp.events_discarded);
+
+		if (rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
+			fprintf(stderr, "NEW METADATA NEEDED\n");
+			ret = get_new_metadata(id);
+			if (ret < 0) {
+				goto error;
+			}
+		}
+		break;
+	case VIEWER_INDEX_RETRY:
+		fprintf(stderr, "(RETRY)\n");
+		sleep(1);
+		goto retry;
+	case VIEWER_INDEX_HUP:
+		fprintf(stderr, "(HUP)\n");
+		session->streams[id].id = -1ULL;
+		session->streams[id].fd = -1;
+		break;
+	case VIEWER_INDEX_ERR:
+		fprintf(stderr, "(ERR)\n");
+		ret = -1;
+		goto error;
+	default:
+		fprintf(stderr, "SHOULD NOT HAPPEN\n");
+		ret = -1;
+		goto error;
+	}
+
+error:
+	return ret;
+}
+
+void ctf_live_packet_seek(struct bt_stream_pos *stream_pos, size_t index,
+		int whence)
+{
+	struct ctf_stream_pos *pos;
+	struct ctf_file_stream *file_stream;
+	struct packet_index packet_index;
+	int ret;
+
+	pos = ctf_pos(stream_pos);
+	file_stream = container_of(pos, struct ctf_file_stream, pos);
+
+	fprintf(stderr, "BT GET_NEXT_INDEX %d\n", pos->fd);
+	ret = get_next_index(pos->fd, &packet_index);
+	if (ret < 0) {
+		fprintf(stderr, "get_next_index failed\n");
+		return;
+	}
+
+	pos->packet_size = packet_index.packet_size;
+	pos->content_size = packet_index.content_size;
+	pos->mmap_base_offset = 0;
+	pos->offset = 0;
+
+	file_stream->parent.cycles_timestamp = packet_index.timestamp_end;
+	file_stream->parent.real_timestamp = ctf_get_real_timestamp(
+			&file_stream->parent, packet_index.timestamp_end);
+
+	if (pos->packet_size == 0) {
+		goto end;
+	}
+
+	fprintf(stderr, "BT GET_DATA_PACKET\n");
+	ret = get_data_packet(pos->fd, be64toh(packet_index.offset),
+			packet_index.packet_size / CHAR_BIT);
+	if (ret < 0) {
+		fprintf(stderr, "get_data_packet failed");
+		return;
+	}
+
+	fprintf(stderr, "BT MMAP %d\n", pos->fd);
+	fprintf(stderr, "packet_size : %lu, offset %lu, content_size %lu, timestamp_end : %lu, real : %lu\n",
+			packet_index.packet_size,
+			packet_index.offset,
+			packet_index.content_size,
+			packet_index.timestamp_end,
+			ctf_get_real_timestamp(
+				&file_stream->parent, packet_index.timestamp_end));
+	if (!pos->base_mma) {
+		pos->base_mma = zmalloc(sizeof(*pos->base_mma));
+		if (!pos->base_mma) {
+			fprintf(stderr, "alloc pos->base_mma\n");
+			return;
+		}
+	}
+
+	mmap_align_set_addr(pos->base_mma, session->streams[pos->fd].mmap_base);
+	if (pos->base_mma == MAP_FAILED) {
+		perror("Error mmaping");
+		return;
+	}
+
+	/* update trace_packet_header and stream_packet_context */
+	if (pos->prot != PROT_WRITE && file_stream->parent.trace_packet_header) {
+		/* Read packet header */
+		ret = generic_rw(&pos->parent, &file_stream->parent.trace_packet_header->p);
+		assert(!ret);
+	}
+	if (pos->prot != PROT_WRITE && file_stream->parent.stream_packet_context) {
+		/* Read packet context */
+		ret = generic_rw(&pos->parent, &file_stream->parent.stream_packet_context->p);
+		assert(!ret);
+	}
+
+end:
+	return;
+}
+
+int open_trace(struct bt_context **bt_ctx)
+{
+	struct bt_mmap_stream *new_mmap_stream;
+	struct bt_mmap_stream_list mmap_list;
+	FILE *metadata_fp = NULL;
+	int i;
+	int ret = 0;
+
+	*bt_ctx = bt_context_create();
+	BT_INIT_LIST_HEAD(&mmap_list.head);
+
+	for (i = 0; i < session->stream_count; i++) {
+		int total_metadata = 0;
+
+		if (!session->streams[i].metadata_flag) {
+			new_mmap_stream = zmalloc(sizeof(struct bt_mmap_stream));
+			/*
+			 * The FD is unused when we handle manually the
+			 * packet seek, so we store here the ID of the
+			 * stream in our stream list to be able to use it
+			 * later.
+			 */
+			new_mmap_stream->fd = i;
+			bt_list_add(&new_mmap_stream->list, &mmap_list.head);
+		} else {
+			/* Get all possible metadata before starting */
+			do {
+				ret = get_new_metadata(i);
+				if (ret > 0) {
+					total_metadata += ret;
+				}
+			} while (ret > 0 || total_metadata == 0);
+			metadata_fp = fopen(session->streams[i].path, "r");
+		}
+	}
+
+	if (!metadata_fp) {
+		fprintf(stderr, "No metadata stream opened\n");
+		goto end;
+	}
+
+	ret = bt_context_add_trace(*bt_ctx, NULL, "ctf",
+			ctf_live_packet_seek, &mmap_list, metadata_fp);
+	if (ret < 0) {
+		fprintf(stderr, "Error adding trace\n");
+		goto end;
+	}
+
+	/*
+	begin_pos.type = BT_SEEK_BEGIN;
+	iter = bt_ctf_iter_create(bt_ctx, &begin_pos, NULL);
+	while ((event = bt_ctf_iter_read_event(iter)) != NULL) {
+		if (!skip) {
+			ret = sout->parent.event_cb(&sout->parent, event->parent->stream);
+			if (ret) {
+				fprintf(stderr, "[error] Writing event failed.\n");
+				goto end;
+			}
+		}
+
+		ret = bt_iter_next(bt_ctf_get_iter(iter));
+		if (ret < 0) {
+			goto end;
+		} else if (ret == EAGAIN) {
+			skip = 1;
+			continue;
+		}
+		skip = 0;
+	}
+	*/
+
+end:
+	return ret;
+}
+
+int setup_network_live(char *hostname)
+{
+	int ret;
+	int session_id;
+
+	session = zmalloc(sizeof(struct live_session));
+	if (!session) {
+		goto error;
+	}
+
+	ret = connect_viewer(hostname);
+	if (ret < 0) {
+		goto error;
+	}
+	fprintf(stderr, "* Connected\n");
+
+	fprintf(stderr, "* Establish connection and version check\n");
+	ret = establish_connection();
+	if (ret < 0) {
+		goto error;
+	}
+
+	fprintf(stderr, "* List sessions\n");
+	ret = list_sessions();
+	if (ret < 0) {
+		fprintf(stderr, "* List error\n");
+		goto error;
+	} else if (ret == 0) {
+		fprintf(stderr, "* No session to attach to, exiting\n");
+		ret = 0;
+		goto end;
+	}
+	session_id = ret;
+
+	do {
+		fprintf(stderr, "* Attach session %d\n", ret);
+		ret = attach_session(session_id);
+		if (ret < 0) {
+			goto error;
+		}
+	} while (session->stream_count == 0);
+
+end:
+	return 0;
+
+error:
+	free(session->streams);
+	fprintf(stderr, "* Exiting %d\n", ret);
+	return ret;
+}