* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
-#define _GNU_SOURCE
#define _LGPL_SOURCE
#include <getopt.h>
#include <grp.h>
#include <urcu/rculist.h>
#include <unistd.h>
#include <fcntl.h>
-#include <config.h>
#include <lttng/lttng.h>
#include <common/common.h>
send_stream.ctf_trace_id = htobe64(ctf_trace->id);
send_stream.metadata_flag = htobe32(
vstream->stream->is_metadata);
- strncpy(send_stream.path_name, vstream->path_name,
- sizeof(send_stream.path_name));
- strncpy(send_stream.channel_name, vstream->channel_name,
- sizeof(send_stream.channel_name));
+ if (lttng_strncpy(send_stream.path_name, vstream->path_name,
+ sizeof(send_stream.path_name))) {
+ pthread_mutex_unlock(&vstream->stream->lock);
+ viewer_stream_put(vstream);
+ ret = -1; /* Error. */
+ goto end_unlock;
+ }
+ if (lttng_strncpy(send_stream.channel_name,
+ vstream->channel_name,
+ sizeof(send_stream.channel_name))) {
+ pthread_mutex_unlock(&vstream->stream->lock);
+ viewer_stream_put(vstream);
+ ret = -1; /* Error. */
+ goto end_unlock;
+ }
DBG("Sending stream %" PRIu64 " to viewer",
vstream->stream->stream_handle);
continue;
}
/*
- * stream published is protected by the session
- * lock.
+ * stream published is protected by the session lock.
*/
if (!stream->published) {
goto next;
/* Update number of created stream counter. */
(*nb_created)++;
}
+ /*
+ * Ensure a self-reference is preserved even
+ * after we have put our local reference.
+ */
+ if (!viewer_stream_get(vstream)) {
+ ERR("Unable to get self-reference on viewer stream, logic error.");
+ abort();
+ }
} else {
if (!vstream->sent_flag && nb_unsent) {
/* Update number of unsent stream counter. */
(*nb_unsent)++;
}
- viewer_stream_put(vstream);
}
/* Update number of total stream counter. */
if (nb_total) {
- (*nb_total)++;
+ if (stream->is_metadata) {
+ if (!stream->closed ||
+ stream->metadata_received > vstream->metadata_sent) {
+ (*nb_total)++;
+ }
+ } else {
+ if (!stream->closed ||
+ !(((int64_t) (stream->prev_seq - stream->last_net_seq_num)) >= 0)) {
+
+ (*nb_total)++;
+ }
+ }
}
+ /* Put local reference. */
+ viewer_stream_put(vstream);
next:
stream_put(stream);
}
goto exit;
}
- if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- ERR("socket poll error");
- goto error;
- } else if (revents & LPOLLIN) {
+ if (revents & LPOLLIN) {
/*
* A new connection is requested, therefore a
* viewer connection is allocated in this
* exchange in cds_wfcq_enqueue.
*/
futex_nto1_wake(&viewer_conn_queue.futex);
+ } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
+ ERR("socket poll error");
+ goto error;
+ } else {
+ ERR("Unexpected poll events %u for sock %d", revents, pollfd);
+ goto error;
}
}
}
static
int viewer_list_sessions(struct relay_connection *conn)
{
- int ret;
+ int ret = 0;
struct lttng_viewer_list_sessions session_list;
struct lttng_ht_iter iter;
struct relay_session *session;
new_buf_count * sizeof(*send_session_buf));
if (!newbuf) {
ret = -1;
- rcu_read_unlock();
- goto end_free;
+ break;
}
send_session_buf = newbuf;
buf_count = new_buf_count;
}
send_session = &send_session_buf[count];
- strncpy(send_session->session_name, session->session_name,
- sizeof(send_session->session_name));
- strncpy(send_session->hostname, session->hostname,
- sizeof(send_session->hostname));
+ if (lttng_strncpy(send_session->session_name,
+ session->session_name,
+ sizeof(send_session->session_name))) {
+ ret = -1;
+ break;
+ }
+ if (lttng_strncpy(send_session->hostname, session->hostname,
+ sizeof(send_session->hostname))) {
+ ret = -1;
+ break;
+ }
send_session->id = htobe64(session->id);
send_session->live_timer = htobe32(session->live_timer);
if (session->viewer_attached) {
count++;
}
rcu_read_unlock();
+ if (ret < 0) {
+ goto end_free;
+ }
session_list.sessions_count = htobe32(count);
response.streams_count = htobe32(nb_streams);
/*
- * If the session is closed, HUP when there are no more streams.
+ * If the session is closed, HUP when there are no more streams
+ * with data.
*/
if (closed && nb_total == 0) {
send_streams = 0;
/*
* Open the index file if needed for the given vstream.
*
- * If an index file is successfully opened, the vstream index_fd set with
- * it.
+ * If an index file is successfully opened, the vstream will set it as its
+ * current index file.
*
* Return 0 on success, a negative value on error (-ENOENT if not ready yet).
*
{
int ret = 0;
- if (vstream->index_fd) {
+ if (vstream->index_file) {
goto end;
}
/*
* First time, we open the index file and at least one index is ready.
*/
- if (rstream->total_index_received == 0) {
+ if (rstream->index_received_seqcount == 0) {
ret = -ENOENT;
goto end;
}
- ret = index_open(vstream->path_name, vstream->channel_name,
+ vstream->index_file = lttng_index_file_open(vstream->path_name,
+ vstream->channel_name,
vstream->stream->tracefile_count,
vstream->current_tracefile_id);
- if (ret >= 0) {
- vstream->index_fd = stream_fd_create(ret);
- if (!vstream->index_fd) {
- if (close(ret)) {
- PERROR("close");
- }
- ret = -1;
- } else {
- ret = 0;
- }
- goto end;
+ if (!vstream->index_file) {
+ ret = -1;
}
end:
{
int ret;
- if (trace->session->connection_closed
- && rstream->total_index_received
- == vstream->last_sent_index) {
- /* Last index sent and session connection is closed. */
+ if ((trace->session->connection_closed || rstream->closed)
+ && rstream->index_received_seqcount
+ == vstream->index_sent_seqcount) {
+ /*
+ * Last index sent and session connection or relay
+ * stream are closed.
+ */
index->status = htobe32(LTTNG_VIEWER_INDEX_HUP);
goto hup;
} else if (rstream->beacon_ts_end != -1ULL &&
- rstream->total_index_received
- == vstream->last_sent_index) {
+ rstream->index_received_seqcount
+ == vstream->index_sent_seqcount) {
/*
* We've received a synchronization beacon and the last index
* available has been sent, the index for now is inactive.
index->timestamp_end = htobe64(rstream->beacon_ts_end);
index->stream_id = htobe64(rstream->ctf_stream_id);
goto index_ready;
- } else if (rstream->total_index_received <= vstream->last_sent_index) {
+ } else if (rstream->index_received_seqcount
+ == vstream->index_sent_seqcount) {
/*
- * This actually checks the case where recv == last_sent.
- * In this case, we have not received a beacon. Therefore, we
- * can only ask the client to retry later.
+ * This checks whether received == sent seqcount. In
+ * this case, we have not received a beacon. Therefore,
+ * we can only ask the client to retry later.
*/
index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY);
goto index_ready;
- } else if (!viewer_stream_is_tracefile_seq_readable(vstream,
- vstream->current_tracefile_seq)) {
+ } else if (!tracefile_array_seq_in_file(rstream->tfa,
+ vstream->current_tracefile_id,
+ vstream->index_sent_seqcount)) {
/*
- * The producer has overwritten our current file. We
- * need to rotate.
+ * The next index we want to send cannot be read either
+ * because we need to perform a rotation, or due to
+ * the producer having overwritten its trace file.
*/
- DBG("Viewer stream %" PRIu64 " rotation due to overwrite",
+ DBG("Viewer stream %" PRIu64 " rotation",
vstream->stream->stream_handle);
ret = viewer_stream_rotate(vstream);
if (ret < 0) {
index->status = htobe32(LTTNG_VIEWER_INDEX_HUP);
goto hup;
}
- assert(viewer_stream_is_tracefile_seq_readable(vstream,
- vstream->current_tracefile_seq));
- /* ret == 0 means successful so we continue. */
- ret = 0;
- } else {
- ssize_t read_ret;
- char tmp[1];
-
/*
- * Use EOF on current index file to find out when we
- * need to rotate.
+ * If we have been pushed due to overwrite, it
+ * necessarily means there is data that can be read in
+ * the stream. If we rotated because we reached the end
+ * of a tracefile, it means the following tracefile
+ * needs to contain at least one index, else we would
+ * have already returned LTTNG_VIEWER_INDEX_RETRY to the
+ * viewer. The updated index_sent_seqcount needs to
+ * point to a readable index entry now.
+ *
+ * In the case where we "rotate" on a single file, we
+ * can end up in a case where the requested index is
+ * still unavailable.
*/
- read_ret = lttng_read(vstream->index_fd->fd, tmp, 1);
- if (read_ret == 1) {
- off_t seek_ret;
-
- /* There is still data to read. Rewind position. */
- seek_ret = lseek(vstream->index_fd->fd, -1, SEEK_CUR);
- if (seek_ret < 0) {
- ret = -1;
- goto end;
- }
- ret = 0;
- } else if (read_ret == 0) {
- /* EOF. We need to rotate. */
- DBG("Viewer stream %" PRIu64 " rotation due to EOF",
- vstream->stream->stream_handle);
- ret = viewer_stream_rotate(vstream);
- if (ret < 0) {
- goto end;
- } else if (ret == 1) {
- /* EOF across entire stream. */
- index->status = htobe32(LTTNG_VIEWER_INDEX_HUP);
- goto hup;
- }
- assert(viewer_stream_is_tracefile_seq_readable(vstream,
- vstream->current_tracefile_seq));
- /* ret == 0 means successful so we continue. */
- ret = 0;
- } else {
- /* Error reading index. */
- ret = -1;
+ if (rstream->tracefile_count == 1 &&
+ !tracefile_array_seq_in_file(
+ rstream->tfa,
+ vstream->current_tracefile_id,
+ vstream->index_sent_seqcount)) {
+ index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY);
+ goto index_ready;
}
+ assert(tracefile_array_seq_in_file(rstream->tfa,
+ vstream->current_tracefile_id,
+ vstream->index_sent_seqcount));
}
+ /* ret == 0 means successful so we continue. */
+ ret = 0;
end:
return ret;
int viewer_get_next_index(struct relay_connection *conn)
{
int ret;
- ssize_t read_ret;
struct lttng_viewer_get_next_index request_index;
struct lttng_viewer_index viewer_index;
struct ctf_packet_index packet_index;
vstream = viewer_stream_get_by_id(be64toh(request_index.stream_id));
if (!vstream) {
- ret = -1;
- goto end;
+ DBG("Client requested index of unknown stream id %" PRIu64,
+ be64toh(request_index.stream_id));
+ viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR);
+ goto send_reply;
}
/* Use back. ref. Protected by refcounts. */
viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM;
}
- read_ret = lttng_read(vstream->index_fd->fd, &packet_index,
- sizeof(packet_index));
- if (read_ret < sizeof(packet_index)) {
- ERR("Relay reading index file %d returned %zd",
- vstream->index_fd->fd, read_ret);
+ ret = lttng_index_file_read(vstream->index_file, &packet_index);
+ if (ret) {
+ ERR("Relay error reading index file %d",
+ vstream->index_file->fd);
viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR);
goto send_reply;
} else {
viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_OK);
- vstream->last_sent_index++;
+ vstream->index_sent_seqcount++;
}
/*
viewer_index.stream_id = packet_index.stream_id;
send_reply:
- pthread_mutex_unlock(&rstream->lock);
+ if (rstream) {
+ pthread_mutex_unlock(&rstream->lock);
+ }
if (metadata_viewer_stream) {
pthread_mutex_lock(&metadata_viewer_stream->stream->lock);
}
health_code_update();
- DBG("Index %" PRIu64 " for stream %" PRIu64 " sent",
- vstream->last_sent_index,
- vstream->stream->stream_handle);
+ if (vstream) {
+ DBG("Index %" PRIu64 " for stream %" PRIu64 " sent",
+ vstream->index_sent_seqcount,
+ vstream->stream->stream_handle);
+ }
end:
if (metadata_viewer_stream) {
viewer_stream_put(metadata_viewer_stream);
struct lttng_viewer_get_packet get_packet_info;
struct lttng_viewer_trace_packet reply;
struct relay_viewer_stream *vstream = NULL;
- struct ctf_trace *ctf_trace;
- struct relay_viewer_stream *metadata_viewer_stream = NULL;
DBG2("Relay get data packet");
vstream = viewer_stream_get_by_id(be64toh(get_packet_info.stream_id));
if (!vstream) {
- goto error;
- }
-
- ctf_trace = vstream->stream->trace;
-
- /* metadata_viewer_stream may be NULL. */
- metadata_viewer_stream =
- ctf_trace_get_viewer_metadata_stream(ctf_trace);
-
- if (metadata_viewer_stream) {
- bool get_packet_err = false;
-
- pthread_mutex_lock(&metadata_viewer_stream->stream->lock);
- DBG("get packet metadata check: recv %" PRIu64 " sent %" PRIu64,
- metadata_viewer_stream->stream->metadata_received,
- metadata_viewer_stream->metadata_sent);
- if (!metadata_viewer_stream->stream->metadata_received ||
- metadata_viewer_stream->stream->metadata_received >
- metadata_viewer_stream->metadata_sent) {
- /*
- * We prevent the client from reading a data stream as
- * long as there is metadata left to consume. This
- * ensures that the client won't receive data of which
- * it can't make sense.
- */
- get_packet_err = true;
- }
- pthread_mutex_unlock(&metadata_viewer_stream->stream->lock);
- viewer_stream_put(metadata_viewer_stream);
- if (get_packet_err) {
- reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR);
- reply.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA;
- goto send_reply_nolock;
- }
+ DBG("Client requested packet of unknown stream id %" PRIu64,
+ be64toh(get_packet_info.stream_id));
+ reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR);
+ goto send_reply_nolock;
}
pthread_mutex_lock(&vstream->stream->lock);
- /*
- * The vstream->stream_fd used here has been opened by
- * get_next_index. It is opened there because this is what
- * allows us to grab a reference to the file with stream lock
- * held, thus protecting us against overwrite caused by
- * tracefile rotation. Since tracefile rotation unlinks the old
- * data file, we are ensured that we won't have our data
- * overwritten under us.
- */
- ret = check_new_streams(conn);
- if (ret < 0) {
- goto end_free;
- } else if (ret == 1) {
- reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR);
- reply.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM;
- goto send_reply;
- }
len = be32toh(get_packet_info.len);
data = zmalloc(len);
* Reply back to the client with an error if we cannot
* find it.
*/
+ DBG("Client requested metadata of unknown stream id %" PRIu64,
+ be64toh(request.stream_id));
reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR);
goto send_reply;
}
return ret;
}
+/*
+ * Detach a viewer session.
+ *
+ * Return 0 on success or else a negative value.
+ */
+static
+int viewer_detach_session(struct relay_connection *conn)
+{
+ int ret;
+ struct lttng_viewer_detach_session_response response;
+ struct lttng_viewer_detach_session_request request;
+ struct relay_session *session = NULL;
+ uint64_t viewer_session_to_close;
+
+ DBG("Viewer detach session received");
+
+ assert(conn);
+
+ health_code_update();
+
+ /* Receive the request from the connected client. */
+ ret = recv_request(conn->sock, &request, sizeof(request));
+ if (ret < 0) {
+ goto end;
+ }
+ viewer_session_to_close = be64toh(request.session_id);
+
+ if (!conn->viewer_session) {
+ DBG("Client trying to detach before creating a live viewer session");
+ response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR);
+ goto send_reply;
+ }
+
+ health_code_update();
+
+ memset(&response, 0, sizeof(response));
+ DBG("Detaching from session ID %" PRIu64, viewer_session_to_close);
+
+ session = session_get_by_id(be64toh(request.session_id));
+ if (!session) {
+ DBG("Relay session %" PRIu64 " not found",
+ be64toh(request.session_id));
+ response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_UNK);
+ goto send_reply;
+ }
+
+ ret = viewer_session_is_attached(conn->viewer_session, session);
+ if (ret != 1) {
+ DBG("Not attached to this session");
+ response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR);
+ goto send_reply_put;
+ }
+
+ viewer_session_close_one_session(conn->viewer_session, session);
+ response.status = htobe32(LTTNG_VIEWER_DETACH_SESSION_OK);
+ DBG("Session %" PRIu64 " detached.", viewer_session_to_close);
+
+send_reply_put:
+ session_put(session);
+
+send_reply:
+ health_code_update();
+ ret = send_response(conn->sock, &response, sizeof(response));
+ if (ret < 0) {
+ goto end;
+ }
+ health_code_update();
+ ret = 0;
+
+end:
+ return ret;
+}
/*
* live_relay_unknown_command: send -1 if received unknown command
case LTTNG_VIEWER_CREATE_SESSION:
ret = viewer_create_session(conn);
break;
+ case LTTNG_VIEWER_DETACH_SESSION:
+ ret = viewer_detach_session(conn);
+ break;
default:
ERR("Received unknown viewer command (%u)",
be32toh(recv_hdr->cmd));
/* Inspect the relay conn pipe for new connection. */
if (pollfd == live_conn_pipe[0]) {
- if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- ERR("Relay live pipe error");
- goto error;
- } else if (revents & LPOLLIN) {
+ if (revents & LPOLLIN) {
struct relay_connection *conn;
ret = lttng_read(live_conn_pipe[0],
LPOLLIN | LPOLLRDHUP);
connection_ht_add(viewer_connections_ht, conn);
DBG("Connection socket %d added to poll", conn->sock->fd);
+ } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
+ ERR("Relay live pipe error");
+ goto error;
+ } else {
+ ERR("Unexpected poll events %u for sock %d", revents, pollfd);
+ goto error;
}
} else {
/* Connection activity. */
continue;
}
- if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- cleanup_connection_pollfd(&events, pollfd);
- /* Put "create" ownership reference. */
- connection_put(conn);
- } else if (revents & LPOLLIN) {
+ if (revents & LPOLLIN) {
ret = conn->sock->ops->recvmsg(conn->sock, &recv_hdr,
sizeof(recv_hdr), 0);
if (ret <= 0) {
DBG("Viewer connection closed with %d", pollfd);
}
}
+ } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
+ cleanup_connection_pollfd(&events, pollfd);
+ /* Put "create" ownership reference. */
+ connection_put(conn);
+ } else {
+ ERR("Unexpected poll events %u for sock %d", revents, pollfd);
+ connection_put(conn);
+ goto error;
}
/* Put local "get_by_sock" reference. */
connection_put(conn);
}
/* Setup the dispatcher thread */
- ret = pthread_create(&live_dispatcher_thread, NULL,
+ ret = pthread_create(&live_dispatcher_thread, default_pthread_attr(),
thread_dispatcher, (void *) NULL);
if (ret) {
errno = ret;
}
/* Setup the worker thread */
- ret = pthread_create(&live_worker_thread, NULL,
+ ret = pthread_create(&live_worker_thread, default_pthread_attr(),
thread_worker, NULL);
if (ret) {
errno = ret;
}
/* Setup the listener thread */
- ret = pthread_create(&live_listener_thread, NULL,
+ ret = pthread_create(&live_listener_thread, default_pthread_attr(),
thread_listener, (void *) NULL);
if (ret) {
errno = ret;
projects / lttng-tools.git / blobdiff