#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
+#include <inttypes.h>
#include <urcu/futex.h>
#include <urcu/uatomic.h>
#include <unistd.h>
return NULL;
}
+/*
+ * Return nonzero if stream needs to be closed.
+ */
+static
+int close_stream_check(struct relay_stream *stream)
+{
+
+ if (stream->close_flag && stream->prev_seq == stream->last_net_seq_num) {
+ return 1;
+ }
+ return 0;
+}
+
/*
* This thread manages the listening for new connections on the network
*/
struct lttng_poll_event events;
struct lttcomm_sock *control_sock, *data_sock;
- /*
- * Get allocated in this thread, enqueued to a global queue, dequeued and
- * freed in the worker thread.
- */
- struct relay_command *relay_cmd = NULL;
-
DBG("[thread] Relay listener started");
control_sock = relay_init_sock(control_uri);
ERR("socket poll error");
goto error;
} else if (revents & LPOLLIN) {
- struct lttcomm_sock *newsock = NULL;
+ /*
+ * Get allocated in this thread,
+ * enqueued to a global queue, dequeued
+ * and freed in the worker thread.
+ */
+ struct relay_command *relay_cmd;
+ struct lttcomm_sock *newsock;
relay_cmd = zmalloc(sizeof(struct relay_command));
if (relay_cmd == NULL) {
if (pollfd == data_sock->fd) {
newsock = data_sock->ops->accept(data_sock);
- if (newsock < 0) {
+ if (!newsock) {
PERROR("accepting data sock");
+ free(relay_cmd);
goto error;
}
relay_cmd->type = RELAY_DATA;
DBG("Relay data connection accepted, socket %d", newsock->fd);
- } else if (pollfd == control_sock->fd) {
+ } else {
+ assert(pollfd == control_sock->fd);
newsock = control_sock->ops->accept(control_sock);
- if (newsock < 0) {
+ if (!newsock) {
PERROR("accepting control sock");
+ free(relay_cmd);
goto error;
}
relay_cmd->type = RELAY_CONTROL;
&val, sizeof(int));
if (ret < 0) {
PERROR("setsockopt inet");
+ lttcomm_destroy_sock(newsock);
+ free(relay_cmd);
goto error;
}
relay_cmd->sock = newsock;
return;
}
- DBG("Relay deleting session %lu", cmd->session->id);
+ DBG("Relay deleting session %" PRIu64, cmd->session->id);
free(cmd->session->sock);
rcu_read_lock();
rcu_read_lock();
stream->stream_handle = ++last_relay_stream_id;
- stream->seq = 0;
+ stream->prev_seq = -1ULL;
stream->session = session;
root_path = create_output_path(stream_info.pathname);
free(root_path);
/* send the session id to the client or a negative return code on error */
if (ret < 0) {
- reply.ret_code = htobe32(LTTCOMM_ERR);
+ reply.ret_code = htobe32(LTTNG_ERR_UNK);
} else {
- reply.ret_code = htobe32(LTTCOMM_OK);
+ reply.ret_code = htobe32(LTTNG_OK);
}
reply.handle = htobe64(stream->stream_handle);
send_ret = cmd->sock->ops->sendmsg(cmd->sock, &reply,
return ret;
}
+/*
+ * relay_close_stream: close a specific stream
+ */
+static
+int relay_close_stream(struct lttcomm_relayd_hdr *recv_hdr,
+ struct relay_command *cmd, struct lttng_ht *streams_ht)
+{
+ struct relay_session *session = cmd->session;
+ struct lttcomm_relayd_close_stream stream_info;
+ struct lttcomm_relayd_generic_reply reply;
+ struct relay_stream *stream;
+ int ret, send_ret;
+ struct lttng_ht_node_ulong *node;
+ struct lttng_ht_iter iter;
+
+ DBG("Close stream received");
+
+ if (!session || session->version_check_done == 0) {
+ ERR("Trying to close a stream before version check");
+ ret = -1;
+ goto end_no_session;
+ }
+
+ ret = cmd->sock->ops->recvmsg(cmd->sock, &stream_info,
+ sizeof(struct lttcomm_relayd_close_stream), MSG_WAITALL);
+ if (ret < sizeof(struct lttcomm_relayd_close_stream)) {
+ ERR("Relay didn't receive valid add_stream struct size : %d", ret);
+ ret = -1;
+ goto end_no_session;
+ }
+
+ rcu_read_lock();
+ lttng_ht_lookup(streams_ht,
+ (void *)((unsigned long) be64toh(stream_info.stream_id)),
+ &iter);
+ node = lttng_ht_iter_get_node_ulong(&iter);
+ if (node == NULL) {
+ DBG("Relay stream %" PRIu64 " not found", be64toh(stream_info.stream_id));
+ ret = -1;
+ goto end_unlock;
+ }
+
+ stream = caa_container_of(node, struct relay_stream, stream_n);
+ if (!stream) {
+ ret = -1;
+ goto end_unlock;
+ }
+
+ stream->last_net_seq_num = be64toh(stream_info.last_net_seq_num);
+ stream->close_flag = 1;
+
+ if (close_stream_check(stream)) {
+ int delret;
+
+ close(stream->fd);
+ delret = lttng_ht_del(streams_ht, &iter);
+ assert(!delret);
+ call_rcu(&stream->rcu_node,
+ deferred_free_stream);
+ DBG("Closed tracefile %d from close stream", stream->fd);
+ }
+
+end_unlock:
+ rcu_read_unlock();
+
+ if (ret < 0) {
+ reply.ret_code = htobe32(LTTNG_ERR_UNK);
+ } else {
+ reply.ret_code = htobe32(LTTNG_OK);
+ }
+ send_ret = cmd->sock->ops->sendmsg(cmd->sock, &reply,
+ sizeof(struct lttcomm_relayd_generic_reply), 0);
+ if (send_ret < 0) {
+ ERR("Relay sending stream id");
+ }
+
+end_no_session:
+ return ret;
+}
+
/*
* relay_unknown_command: send -1 if received unknown command
*/
struct lttcomm_relayd_generic_reply reply;
int ret;
- reply.ret_code = htobe32(LTTCOMM_ERR);
+ reply.ret_code = htobe32(LTTNG_ERR_UNK);
ret = cmd->sock->ops->sendmsg(cmd->sock, &reply,
sizeof(struct lttcomm_relayd_generic_reply), 0);
if (ret < 0) {
int relay_start(struct lttcomm_relayd_hdr *recv_hdr,
struct relay_command *cmd)
{
- int ret = htobe32(LTTCOMM_OK);
+ int ret = htobe32(LTTNG_OK);
struct lttcomm_relayd_generic_reply reply;
struct relay_session *session = cmd->session;
if (!session) {
DBG("Trying to start the streaming without a session established");
- ret = htobe32(LTTCOMM_ERR);
+ ret = htobe32(LTTNG_ERR_UNK);
}
reply.ret_code = ret;
&iter);
node = lttng_ht_iter_get_node_ulong(&iter);
if (node == NULL) {
- DBG("Relay stream %lu not found", stream_id);
+ DBG("Relay stream %" PRIu64 " not found", stream_id);
ret = NULL;
goto end;
}
return ret;
}
+/*
+ * Append padding to the file pointed by the file descriptor fd.
+ */
+static int write_padding_to_file(int fd, uint32_t size)
+{
+ int ret = 0;
+ char *zeros;
+
+ if (size == 0) {
+ goto end;
+ }
+
+ zeros = zmalloc(size);
+ if (zeros == NULL) {
+ PERROR("zmalloc zeros for padding");
+ ret = -1;
+ goto end;
+ }
+
+ do {
+ ret = write(fd, zeros, size);
+ } while (ret < 0 && errno == EINTR);
+ if (ret < 0) {
+ PERROR("write padding to file");
+ }
+
+end:
+ return ret;
+}
+
/*
* relay_recv_metadata: receive the metada for the session.
*/
int relay_recv_metadata(struct lttcomm_relayd_hdr *recv_hdr,
struct relay_command *cmd, struct lttng_ht *streams_ht)
{
- int ret = htobe32(LTTCOMM_OK);
+ int ret = htobe32(LTTNG_OK);
struct relay_session *session = cmd->session;
struct lttcomm_relayd_metadata_payload *metadata_struct;
struct relay_stream *metadata_stream;
goto end;
}
- data_size = be64toh(recv_hdr->data_size);
- payload_size = data_size - sizeof(uint64_t);
+ data_size = payload_size = be64toh(recv_hdr->data_size);
+ if (data_size < sizeof(struct lttcomm_relayd_metadata_payload)) {
+ ERR("Incorrect data size");
+ ret = -1;
+ goto end;
+ }
+ payload_size -= sizeof(struct lttcomm_relayd_metadata_payload);
+
if (data_buffer_size < data_size) {
data_buffer = realloc(data_buffer, data_size);
if (!data_buffer) {
data_buffer_size = data_size;
}
memset(data_buffer, 0, data_size);
- DBG2("Relay receiving metadata, waiting for %lu bytes", data_size);
- ret = cmd->sock->ops->recvmsg(cmd->sock, data_buffer, data_size, MSG_WAITALL);
+ DBG2("Relay receiving metadata, waiting for %" PRIu64 " bytes", data_size);
+ ret = cmd->sock->ops->recvmsg(cmd->sock, data_buffer, data_size,
+ MSG_WAITALL);
if (ret < 0 || ret != data_size) {
ret = -1;
ERR("Relay didn't receive the whole metadata");
ret = write(metadata_stream->fd, metadata_struct->payload,
payload_size);
} while (ret < 0 && errno == EINTR);
- if (ret < (payload_size)) {
+ if (ret < payload_size) {
ERR("Relay error writing metadata on file");
ret = -1;
goto end_unlock;
}
+
+ ret = write_padding_to_file(metadata_stream->fd,
+ be32toh(metadata_struct->padding_size));
+ if (ret < 0) {
+ goto end_unlock;
+ }
+
DBG2("Relay metadata written");
end_unlock:
int relay_send_version(struct lttcomm_relayd_hdr *recv_hdr,
struct relay_command *cmd)
{
- int ret = htobe32(LTTCOMM_OK);
+ int ret;
struct lttcomm_relayd_version reply;
- struct relay_session *session = NULL;
+ struct relay_session *session;
if (cmd->session == NULL) {
session = zmalloc(sizeof(struct relay_session));
goto end;
}
session->id = ++last_relay_session_id;
- DBG("Created session %lu", session->id);
+ DBG("Created session %" PRIu64, session->id);
cmd->session = session;
+ } else {
+ session = cmd->session;
}
session->version_check_done = 1;
- sscanf(VERSION, "%u.%u", &reply.major, &reply.minor);
+ ret = sscanf(VERSION, "%u.%u", &reply.major, &reply.minor);
+ if (ret < 2) {
+ ERR("Error in scanning version");
+ ret = -1;
+ goto end;
+ }
reply.major = htobe32(reply.major);
reply.minor = htobe32(reply.minor);
ret = cmd->sock->ops->sendmsg(cmd->sock, &reply,
if (ret < 0) {
ERR("Relay sending version");
}
- DBG("Version check done");
+ DBG("Version check done (%u.%u)", be32toh(reply.major),
+ be32toh(reply.minor));
end:
return ret;
}
+/*
+ * Check for data availability for a given stream id from the session daemon.
+ */
+static
+int relay_data_available(struct lttcomm_relayd_hdr *recv_hdr,
+ struct relay_command *cmd, struct lttng_ht *streams_ht)
+{
+ struct relay_session *session = cmd->session;
+ struct lttcomm_relayd_data_available msg;
+ struct lttcomm_relayd_generic_reply reply;
+ struct relay_stream *stream;
+ int ret;
+ struct lttng_ht_node_ulong *node;
+ struct lttng_ht_iter iter;
+ uint64_t last_net_seq_num, stream_id;
+
+ DBG("Data available command received");
+
+ if (!session || session->version_check_done == 0) {
+ ERR("Trying to check for data before version check");
+ ret = -1;
+ goto end_no_session;
+ }
+
+ ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), MSG_WAITALL);
+ if (ret < sizeof(msg)) {
+ ERR("Relay didn't receive valid data_available struct size : %d", ret);
+ ret = -1;
+ goto end_no_session;
+ }
+
+ stream_id = be64toh(msg.stream_id);
+ last_net_seq_num = be64toh(msg.last_net_seq_num);
+
+ rcu_read_lock();
+ lttng_ht_lookup(streams_ht, (void *)((unsigned long) stream_id), &iter);
+ node = lttng_ht_iter_get_node_ulong(&iter);
+ if (node == NULL) {
+ DBG("Relay stream %" PRIu64 " not found", stream_id);
+ ret = -1;
+ goto end_unlock;
+ }
+
+ stream = caa_container_of(node, struct relay_stream, stream_n);
+ assert(stream);
+
+ DBG("Data available for stream id %" PRIu64 " prev_seq %" PRIu64
+ " and last_seq %" PRIu64, stream_id, stream->prev_seq,
+ last_net_seq_num);
+
+ if (stream->prev_seq == -1UL || stream->prev_seq <= last_net_seq_num) {
+ /* Data has in fact been written and is available */
+ ret = 1;
+ } else {
+ /* Data still being streamed. */
+ ret = 0;
+ }
+
+end_unlock:
+ rcu_read_unlock();
+
+ reply.ret_code = htobe32(ret);
+ ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0);
+ if (ret < 0) {
+ ERR("Relay data available ret code failed");
+ }
+
+end_no_session:
+ return ret;
+}
+
+/*
+ * Wait for the control socket to reach a quiescent state.
+ *
+ * Note that for now, when receiving this command from the session daemon, this
+ * means that every subsequent commands or data received on the control socket
+ * has been handled. So, this is why we simply return OK here.
+ */
+static
+int relay_quiescent_control(struct lttcomm_relayd_hdr *recv_hdr,
+ struct relay_command *cmd)
+{
+ int ret;
+ struct lttcomm_relayd_generic_reply reply;
+
+ DBG("Checking quiescent state on control socket");
+
+ reply.ret_code = htobe32(LTTNG_OK);
+ ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0);
+ if (ret < 0) {
+ ERR("Relay data available ret code failed");
+ }
+
+ return ret;
+}
+
/*
* relay_process_control: Process the commands received on the control socket
*/
case RELAYD_VERSION:
ret = relay_send_version(recv_hdr, cmd);
break;
+ case RELAYD_CLOSE_STREAM:
+ ret = relay_close_stream(recv_hdr, cmd, streams_ht);
+ break;
+ case RELAYD_DATA_AVAILABLE:
+ ret = relay_data_available(recv_hdr, cmd, streams_ht);
+ break;
+ case RELAYD_QUIESCENT_CONTROL:
+ ret = relay_quiescent_control(recv_hdr, cmd);
+ break;
case RELAYD_UPDATE_SYNC_INFO:
default:
ERR("Received unknown command (%u)", be32toh(recv_hdr->cmd));
struct relay_stream *stream;
struct lttcomm_relayd_data_hdr data_hdr;
uint64_t stream_id;
+ uint64_t net_seq_num;
uint32_t data_size;
ret = cmd->sock->ops->recvmsg(cmd->sock, &data_hdr,
}
memset(data_buffer, 0, data_size);
+ net_seq_num = be64toh(data_hdr.net_seq_num);
+
+ DBG3("Receiving data of size %u for stream id %" PRIu64 " seqnum %" PRIu64,
+ data_size, stream_id, net_seq_num);
ret = cmd->sock->ops->recvmsg(cmd->sock, data_buffer, data_size, MSG_WAITALL);
if (ret <= 0) {
ret = -1;
ret = -1;
goto end_unlock;
}
- DBG2("Relay wrote %d bytes to tracefile for stream id %lu", ret, stream->stream_handle);
+
+ DBG2("Relay wrote %d bytes to tracefile for stream id %" PRIu64,
+ ret, stream->stream_handle);
+
+ ret = write_padding_to_file(stream->fd, be32toh(data_hdr.padding_size));
+ if (ret < 0) {
+ goto end_unlock;
+ }
+
+ stream->prev_seq = net_seq_num;
+
+ /* Check if we need to close the FD */
+ if (close_stream_check(stream)) {
+ struct lttng_ht_iter iter;
+
+ close(stream->fd);
+ iter.iter.node = &stream->stream_n.node;
+ ret = lttng_ht_del(streams_ht, &iter);
+ assert(!ret);
+ call_rcu(&stream->rcu_node,
+ deferred_free_stream);
+ DBG("Closed tracefile %d after recv data", stream->fd);
+ }
end_unlock:
rcu_read_unlock();
goto error;
}
ret = read(fd, relay_connection, sizeof(struct relay_command));
- if (ret < 0 || ret < sizeof(relay_connection)) {
+ if (ret < 0 || ret < sizeof(struct relay_command)) {
PERROR("read relay cmd pipe");
goto error_read;
}
/* Infinite blocking call, waiting for transmission */
restart:
+ DBG3("Relayd worker thread polling...");
ret = lttng_poll_wait(&events, -1);
if (ret < 0) {
/*
DBG("Control connection closed with %d", pollfd);
} else {
if (relay_connection->session) {
- DBG2("Relay worker receiving data for session : %lu",
+ DBG2("Relay worker receiving data for session : %" PRIu64,
relay_connection->session->id);
}
ret = relay_process_control(&recv_hdr,
projects / lttng-tools.git / blobdiff