X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=src%2Fcommon%2Frelayd%2Frelayd.c;h=9e10c83e02f7ec583bff72cd5b6d70b42870dca1;hb=ffe600149a7608221985751e1bf293234bf2545c;hp=9cc682713ca7368b6d0b21255bbf84c4740a39b2;hpb=092b625914723e40ccb3345826a2280cbd01f8b8;p=lttng-tools.git

diff --git a/src/common/relayd/relayd.c b/src/common/relayd/relayd.c
index 9cc682713..9e10c83e0 100644
--- a/src/common/relayd/relayd.c
+++ b/src/common/relayd/relayd.c
@@ -33,7 +33,7 @@
  * 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;
@@ -90,11 +90,67 @@ static int recv_reply(struct lttcomm_sock *sock, void *data, size_t size)
 	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) {
-		ret = -errno;
 		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;
 }
@@ -139,8 +195,8 @@ int relayd_add_stream(struct lttcomm_sock *sock, const char *channel_name,
 
 	/* 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;
@@ -180,7 +236,7 @@ int relayd_version_check(struct lttcomm_sock *sock, uint32_t major,
 		goto error;
 	}
 
-	/* Recevie response */
+	/* Receive response */
 	ret = recv_reply(sock, (void *) &msg, sizeof(msg));
 	if (ret < 0) {
 		goto error;
@@ -271,15 +327,44 @@ int relayd_connect(struct lttcomm_sock *sock)
 
 /*
  * 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;
 }
 
 /*
@@ -341,7 +426,7 @@ int relayd_send_close_stream(struct lttcomm_sock *sock, uint64_t stream_id,
 		goto error;
 	}
 
-	/* Recevie response */
+	/* Receive response */
 	ret = recv_reply(sock, (void *) &reply, sizeof(reply));
 	if (ret < 0) {
 		goto error;
@@ -351,8 +436,8 @@ int relayd_send_close_stream(struct lttcomm_sock *sock, uint64_t stream_id,
 
 	/* 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;
@@ -391,7 +476,7 @@ int relayd_data_pending(struct lttcomm_sock *sock, uint64_t stream_id,
 		goto error;
 	}
 
-	/* Recevie response */
+	/* Receive response */
 	ret = recv_reply(sock, (void *) &reply, sizeof(reply));
 	if (ret < 0) {
 		goto error;
@@ -401,15 +486,14 @@ int relayd_data_pending(struct lttcomm_sock *sock, uint64_t stream_id,
 
 	/* Return session id or negative ret code. */
 	if (reply.ret_code >= LTTNG_OK) {
-		ret = -reply.ret_code;
-		ERR("Relayd data pending replied error %d", ret);
+		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);
+			ret == 1 ? "" : "NOT", stream_id);
 
 error:
 	return ret;
@@ -418,9 +502,11 @@ error:
 /*
  * Check on the relayd side for a quiescent state on the control socket.
  */
-int relayd_quiescent_control(struct lttcomm_sock *sock)
+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. */
@@ -428,13 +514,15 @@ int relayd_quiescent_control(struct lttcomm_sock *sock)
 
 	DBG("Relayd checking quiescent control state");
 
+	msg.stream_id = htobe64(metadata_stream_id);
+
 	/* Send command */
-	ret = send_command(sock, RELAYD_QUIESCENT_CONTROL, NULL, 0, 0);
+	ret = send_command(sock, RELAYD_QUIESCENT_CONTROL, &msg, sizeof(msg), 0);
 	if (ret < 0) {
 		goto error;
 	}
 
-	/* Recevie response */
+	/* Receive response */
 	ret = recv_reply(sock, (void *) &reply, sizeof(reply));
 	if (ret < 0) {
 		goto error;
@@ -444,8 +532,8 @@ int relayd_quiescent_control(struct lttcomm_sock *sock)
 
 	/* Return session id or negative ret code. */
 	if (reply.ret_code != LTTNG_OK) {
-		ret = -reply.ret_code;
-		ERR("Relayd quiescent control replied error %d", ret);
+		ret = -1;
+		ERR("Relayd quiescent control replied error %d", reply.ret_code);
 		goto error;
 	}
 
@@ -455,3 +543,94 @@ int relayd_quiescent_control(struct lttcomm_sock *sock)
 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;
+}