* Send command. Fill up the header and append the data.
*/
static int send_command(struct lttcomm_sock *sock,
- enum lttcomm_sessiond_command cmd, void *data, size_t size,
+ enum lttcomm_relayd_command cmd, void *data, size_t size,
int flags)
{
int ret;
ret = sock->ops->sendmsg(sock, buf, buf_size, flags);
if (ret < 0) {
+ ret = -errno;
goto error;
}
DBG3("Relayd waiting for reply of size %ld", size);
ret = sock->ops->recvmsg(sock, data, size, 0);
+ if (ret <= 0 || ret != size) {
+ if (ret == 0) {
+ /* Orderly shutdown. */
+ DBG("Socket %d has performed an orderly shutdown", sock->fd);
+ } else {
+ DBG("Receiving reply failed on sock %d for size %lu with ret %d",
+ sock->fd, size, ret);
+ }
+ /* Always return -1 here and the caller can use errno. */
+ ret = -1;
+ goto error;
+ }
+
+error:
+ return ret;
+}
+
+/*
+ * Send a RELAYD_CREATE_SESSION command to the relayd with the given socket and
+ * set session_id of the relayd if we have a successful reply from the relayd.
+ *
+ * On success, return 0 else a negative value which is either an errno error or
+ * a lttng error code from the relayd.
+ */
+int relayd_create_session(struct lttcomm_sock *sock, uint64_t *session_id)
+{
+ int ret;
+ struct lttcomm_relayd_status_session reply;
+
+ assert(sock);
+ assert(session_id);
+
+ DBG("Relayd create session");
+
+ /* Send command */
+ ret = send_command(sock, RELAYD_CREATE_SESSION, NULL, 0, 0);
if (ret < 0) {
goto error;
}
+ /* Receive response */
+ ret = recv_reply(sock, (void *) &reply, sizeof(reply));
+ if (ret < 0) {
+ goto error;
+ }
+
+ reply.session_id = be64toh(reply.session_id);
+ reply.ret_code = be32toh(reply.ret_code);
+
+ /* Return session id or negative ret code. */
+ if (reply.ret_code != LTTNG_OK) {
+ ret = -1;
+ ERR("Relayd create session replied error %d", reply.ret_code);
+ goto error;
+ } else {
+ ret = 0;
+ *session_id = reply.session_id;
+ }
+
+ DBG("Relayd session created with id %" PRIu64, reply.session_id);
+
error:
return ret;
}
/* Return session id or negative ret code. */
if (reply.ret_code != LTTNG_OK) {
- ret = -reply.ret_code;
- ERR("Relayd add stream replied error %d", ret);
+ ret = -1;
+ ERR("Relayd add stream replied error %d", reply.ret_code);
} else {
/* Success */
ret = 0;
/*
* Check version numbers on the relayd.
+ * If major versions are compatible, we assign minor_to_use to the
+ * minor version of the procotol we are going to use for this session.
*
* Return 0 if compatible else negative value.
*/
int relayd_version_check(struct lttcomm_sock *sock, uint32_t major,
- uint32_t minor)
+ uint32_t minor, uint32_t *minor_to_use)
{
int ret;
- struct lttcomm_relayd_version reply;
+ struct lttcomm_relayd_version msg;
/* Code flow error. Safety net. */
assert(sock);
DBG("Relayd version check for major.minor %u.%u", major, minor);
+ /* Prepare network byte order before transmission. */
+ msg.major = htobe32(major);
+ msg.minor = htobe32(minor);
+
/* Send command */
- ret = send_command(sock, RELAYD_VERSION, NULL, 0, 0);
+ ret = send_command(sock, RELAYD_VERSION, (void *) &msg, sizeof(msg), 0);
if (ret < 0) {
goto error;
}
- /* Recevie response */
- ret = recv_reply(sock, (void *) &reply, sizeof(reply));
+ /* Receive response */
+ ret = recv_reply(sock, (void *) &msg, sizeof(msg));
if (ret < 0) {
goto error;
}
/* Set back to host bytes order */
- reply.major = be32toh(reply.major);
- reply.minor = be32toh(reply.minor);
-
- /* Validate version */
- if (reply.major <= major) {
- if (reply.minor <= minor) {
- /* Compatible */
- ret = 0;
- DBG2("Relayd version is compatible");
- goto error;
- }
+ msg.major = be32toh(msg.major);
+ msg.minor = be32toh(msg.minor);
+
+ /*
+ * Only validate the major version. If the other side is higher,
+ * communication is not possible. Only major version equal can talk to each
+ * other. If the minor version differs, the lowest version is used by both
+ * sides.
+ */
+ if (msg.major != major) {
+ /* Not compatible */
+ ret = -1;
+ DBG2("Relayd version is NOT compatible. Relayd version %u != %u (us)",
+ msg.major, major);
+ goto error;
}
- /* Version number not compatible */
- DBG2("Relayd version is NOT compatible %u.%u > %u.%u", reply.major,
- reply.minor, major, minor);
- ret = -1;
+ /*
+ * After 2.1.0 release, for the 2.2 release, at this point will have to
+ * check the minor version in order for the session daemon to know which
+ * structure to use to communicate with the relayd. If the relayd's minor
+ * version is higher, it will adapt to our version so we can continue to
+ * use the latest relayd communication data structure.
+ */
+ if (minor <= msg.minor) {
+ *minor_to_use = minor;
+ } else {
+ *minor_to_use = msg.minor;
+ }
+
+ /* Version number compatible */
+ DBG2("Relayd version is compatible, using protocol version %u.%u",
+ major, *minor_to_use);
+ ret = 0;
error:
return ret;
/*
* Close relayd socket with an allocated lttcomm_sock.
+ *
+ * If no socket operations are found, simply return 0 meaning that everything
+ * is fine. Without operations, the socket can not possibly be opened or used.
+ * This is possible if the socket was allocated but not created. However, the
+ * caller could simply use it to store a valid file descriptor for instance
+ * passed over a Unix socket and call this to cleanup but still without a valid
+ * ops pointer.
+ *
+ * Return the close returned value. On error, a negative value is usually
+ * returned back from close(2).
*/
int relayd_close(struct lttcomm_sock *sock)
{
+ int ret;
+
/* Code flow error. Safety net. */
assert(sock);
+ /* An invalid fd is fine, return success. */
+ if (sock->fd < 0) {
+ ret = 0;
+ goto end;
+ }
+
DBG3("Relayd closing socket %d", sock->fd);
- return sock->ops->close(sock);
+ if (sock->ops) {
+ ret = sock->ops->close(sock);
+ } else {
+ /* Default call if no specific ops found. */
+ ret = close(sock->fd);
+ if (ret < 0) {
+ PERROR("relayd_close default close");
+ }
+ }
+
+end:
+ return ret;
}
/*
/* Only send data header. */
ret = sock->ops->sendmsg(sock, hdr, size, 0);
if (ret < 0) {
+ ret = -errno;
goto error;
}
goto error;
}
- /* Recevie response */
+ /* Receive response */
ret = recv_reply(sock, (void *) &reply, sizeof(reply));
if (ret < 0) {
goto error;
/* Return session id or negative ret code. */
if (reply.ret_code != LTTNG_OK) {
- ret = -reply.ret_code;
- ERR("Relayd close stream replied error %d", ret);
+ ret = -1;
+ ERR("Relayd close stream replied error %d", reply.ret_code);
} else {
/* Success */
ret = 0;
error:
return ret;
}
+
+/*
+ * Check for data availability for a given stream id.
+ *
+ * Return 0 if NOT pending, 1 if so and a negative value on error.
+ */
+int relayd_data_pending(struct lttcomm_sock *sock, uint64_t stream_id,
+ uint64_t last_net_seq_num)
+{
+ int ret;
+ struct lttcomm_relayd_data_pending msg;
+ struct lttcomm_relayd_generic_reply reply;
+
+ /* Code flow error. Safety net. */
+ assert(sock);
+
+ DBG("Relayd data pending for stream id %" PRIu64, stream_id);
+
+ msg.stream_id = htobe64(stream_id);
+ msg.last_net_seq_num = htobe64(last_net_seq_num);
+
+ /* Send command */
+ ret = send_command(sock, RELAYD_DATA_PENDING, (void *) &msg,
+ sizeof(msg), 0);
+ if (ret < 0) {
+ goto error;
+ }
+
+ /* Receive response */
+ ret = recv_reply(sock, (void *) &reply, sizeof(reply));
+ if (ret < 0) {
+ goto error;
+ }
+
+ reply.ret_code = be32toh(reply.ret_code);
+
+ /* Return session id or negative ret code. */
+ if (reply.ret_code >= LTTNG_OK) {
+ ERR("Relayd data pending replied error %d", reply.ret_code);
+ }
+
+ /* At this point, the ret code is either 1 or 0 */
+ ret = reply.ret_code;
+
+ DBG("Relayd data is %s pending for stream id %" PRIu64,
+ ret == 1 ? "" : "NOT", stream_id);
+
+error:
+ return ret;
+}
+
+/*
+ * Check on the relayd side for a quiescent state on the control socket.
+ */
+int relayd_quiescent_control(struct lttcomm_sock *sock,
+ uint64_t metadata_stream_id)
+{
+ int ret;
+ struct lttcomm_relayd_quiescent_control msg;
+ struct lttcomm_relayd_generic_reply reply;
+
+ /* Code flow error. Safety net. */
+ assert(sock);
+
+ DBG("Relayd checking quiescent control state");
+
+ msg.stream_id = htobe64(metadata_stream_id);
+
+ /* Send command */
+ ret = send_command(sock, RELAYD_QUIESCENT_CONTROL, &msg, sizeof(msg), 0);
+ if (ret < 0) {
+ goto error;
+ }
+
+ /* Receive response */
+ ret = recv_reply(sock, (void *) &reply, sizeof(reply));
+ if (ret < 0) {
+ goto error;
+ }
+
+ reply.ret_code = be32toh(reply.ret_code);
+
+ /* Return session id or negative ret code. */
+ if (reply.ret_code != LTTNG_OK) {
+ ret = -1;
+ ERR("Relayd quiescent control replied error %d", reply.ret_code);
+ goto error;
+ }
+
+ /* Control socket is quiescent */
+ return 0;
+
+error:
+ return ret;
+}
+
+/*
+ * Begin a data pending command for a specific session id.
+ */
+int relayd_begin_data_pending(struct lttcomm_sock *sock, uint64_t id)
+{
+ int ret;
+ struct lttcomm_relayd_begin_data_pending msg;
+ struct lttcomm_relayd_generic_reply reply;
+
+ /* Code flow error. Safety net. */
+ assert(sock);
+
+ DBG("Relayd begin data pending");
+
+ msg.session_id = htobe64(id);
+
+ /* Send command */
+ ret = send_command(sock, RELAYD_BEGIN_DATA_PENDING, &msg, sizeof(msg), 0);
+ if (ret < 0) {
+ goto error;
+ }
+
+ /* Receive response */
+ ret = recv_reply(sock, (void *) &reply, sizeof(reply));
+ if (ret < 0) {
+ goto error;
+ }
+
+ reply.ret_code = be32toh(reply.ret_code);
+
+ /* Return session id or negative ret code. */
+ if (reply.ret_code != LTTNG_OK) {
+ ret = -1;
+ ERR("Relayd begin data pending replied error %d", reply.ret_code);
+ goto error;
+ }
+
+ return 0;
+
+error:
+ return ret;
+}
+
+/*
+ * End a data pending command for a specific session id.
+ *
+ * Return 0 on success and set is_data_inflight to 0 if no data is being
+ * streamed or 1 if it is the case.
+ */
+int relayd_end_data_pending(struct lttcomm_sock *sock, uint64_t id,
+ unsigned int *is_data_inflight)
+{
+ int ret;
+ struct lttcomm_relayd_end_data_pending msg;
+ struct lttcomm_relayd_generic_reply reply;
+
+ /* Code flow error. Safety net. */
+ assert(sock);
+
+ DBG("Relayd end data pending");
+
+ msg.session_id = htobe64(id);
+
+ /* Send command */
+ ret = send_command(sock, RELAYD_END_DATA_PENDING, &msg, sizeof(msg), 0);
+ if (ret < 0) {
+ goto error;
+ }
+
+ /* Receive response */
+ ret = recv_reply(sock, (void *) &reply, sizeof(reply));
+ if (ret < 0) {
+ goto error;
+ }
+
+ reply.ret_code = be32toh(reply.ret_code);
+ if (reply.ret_code < 0) {
+ ret = reply.ret_code;
+ goto error;
+ }
+
+ *is_data_inflight = reply.ret_code;
+
+ DBG("Relayd end data pending is data inflight: %d", reply.ret_code);
+
+ return 0;
+
+error:
+ return ret;
+}
projects / lttng-tools.git / blobdiff