* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
-#define _GNU_SOURCE
+#define _LGPL_SOURCE
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
+#include <inttypes.h>
#include <common/common.h>
#include <common/defaults.h>
#include <common/uri.h>
+#include <common/relayd/relayd.h>
#include "consumer.h"
+#include "health-sessiond.h"
+#include "ust-app.h"
+#include "utils.h"
/*
- * Allocate and assign data to a consumer_output object.
+ * Send a data payload using a given consumer socket of size len.
*
- * Return pointer to structure.
+ * The consumer socket lock MUST be acquired before calling this since this
+ * function can change the fd value.
+ *
+ * Return 0 on success else a negative value on error.
*/
-struct consumer_output *consumer_create_output(enum consumer_dst_type type)
+int consumer_socket_send(struct consumer_socket *socket, void *msg, size_t len)
{
- struct consumer_output *output = NULL;
+ int fd;
+ ssize_t size;
- output = zmalloc(sizeof(struct consumer_output));
- if (output == NULL) {
- PERROR("zmalloc consumer_output");
+ assert(socket);
+ assert(socket->fd_ptr);
+ assert(msg);
+
+ /* Consumer socket is invalid. Stopping. */
+ fd = *socket->fd_ptr;
+ if (fd < 0) {
goto error;
}
- /* By default, consumer output is enabled */
- output->enabled = 1;
- output->type = type;
- output->net_seq_index = -1;
- /*
- * Important to keep it to a negative value on creation since it was zeroed
- * during allocation and the file descriptor 0 is a valid one.
- */
- output->sock = -1;
+ size = lttcomm_send_unix_sock(fd, msg, len);
+ if (size < 0) {
+ /* The above call will print a PERROR on error. */
+ DBG("Error when sending data to consumer on sock %d", fd);
+ /*
+ * At this point, the socket is not usable anymore thus closing it and
+ * setting the file descriptor to -1 so it is not reused.
+ */
+
+ /* This call will PERROR on error. */
+ (void) lttcomm_close_unix_sock(fd);
+ *socket->fd_ptr = -1;
+ goto error;
+ }
+
+ return 0;
error:
- return output;
+ return -1;
}
/*
- * Delete the consumer_output object from the list and free the ptr.
+ * Receive a data payload using a given consumer socket of size len.
+ *
+ * The consumer socket lock MUST be acquired before calling this since this
+ * function can change the fd value.
+ *
+ * Return 0 on success else a negative value on error.
*/
-void consumer_destroy_output(struct consumer_output *obj)
+int consumer_socket_recv(struct consumer_socket *socket, void *msg, size_t len)
{
- if (obj == NULL) {
- return;
- }
+ int fd;
+ ssize_t size;
- if (obj->sock >= 0) {
- (void) close(obj->sock);
- }
- free(obj);
-}
+ assert(socket);
+ assert(socket->fd_ptr);
+ assert(msg);
-/*
- * Copy consumer output and returned the newly allocated copy.
- */
-struct consumer_output *consumer_copy_output(struct consumer_output *obj)
-{
- struct consumer_output *output;
+ /* Consumer socket is invalid. Stopping. */
+ fd = *socket->fd_ptr;
+ if (fd < 0) {
+ goto error;
+ }
- assert(obj);
+ size = lttcomm_recv_unix_sock(fd, msg, len);
+ if (size <= 0) {
+ /* The above call will print a PERROR on error. */
+ DBG("Error when receiving data from the consumer socket %d", fd);
+ /*
+ * At this point, the socket is not usable anymore thus closing it and
+ * setting the file descriptor to -1 so it is not reused.
+ */
- output = consumer_create_output(obj->type);
- if (output == NULL) {
+ /* This call will PERROR on error. */
+ (void) lttcomm_close_unix_sock(fd);
+ *socket->fd_ptr = -1;
goto error;
}
- memcpy(output, obj, sizeof(struct consumer_output));
+ return 0;
error:
- return output;
+ return -1;
}
/*
- * Set network URI to the consumer output object.
+ * Receive a reply command status message from the consumer. Consumer socket
+ * lock MUST be acquired before calling this function.
*
- * Return 0 on success. Negative value on error.
+ * Return 0 on success, -1 on recv error or a negative lttng error code which
+ * was possibly returned by the consumer.
*/
-int consumer_set_network_uri(struct consumer_output *obj,
- struct lttng_uri *uri)
+int consumer_recv_status_reply(struct consumer_socket *sock)
{
int ret;
- char tmp_path[PATH_MAX];
- char hostname[HOST_NAME_MAX];
- struct lttng_uri *dst_uri = NULL;
-
- /* Code flow error safety net. */
- assert(obj);
- assert(uri);
+ struct lttcomm_consumer_status_msg reply;
- switch (uri->stype) {
- case LTTNG_STREAM_CONTROL:
- dst_uri = &obj->dst.net.control;
- obj->dst.net.control_isset = 1;
- if (uri->port == 0) {
- /* Assign default port. */
- uri->port = DEFAULT_NETWORK_CONTROL_PORT;
- }
- break;
- case LTTNG_STREAM_DATA:
- dst_uri = &obj->dst.net.data;
- obj->dst.net.data_isset = 1;
- if (uri->port == 0) {
- /* Assign default port. */
- uri->port = DEFAULT_NETWORK_DATA_PORT;
- }
- break;
- default:
- ERR("Set network uri type unknown %d", uri->stype);
- goto error;
- }
+ assert(sock);
- ret = uri_compare(dst_uri, uri);
- if (!ret) {
- /* Same URI, don't touch it and return success. */
- DBG3("URI network compare are the same");
+ ret = consumer_socket_recv(sock, &reply, sizeof(reply));
+ if (ret < 0) {
goto end;
}
- /* URIs were not equal, replacing it. */
- memset(dst_uri, 0, sizeof(struct lttng_uri));
- memcpy(dst_uri, uri, sizeof(struct lttng_uri));
- obj->type = CONSUMER_DST_NET;
-
- /* Handle subdir and add hostname in front. */
- if (dst_uri->stype == LTTNG_STREAM_CONTROL) {
- /* Get hostname to append it in the pathname */
- ret = gethostname(hostname, sizeof(hostname));
- if (ret < 0) {
- PERROR("gethostname. Fallback on default localhost");
- strncpy(hostname, "localhost", sizeof(hostname));
- }
- hostname[sizeof(hostname) - 1] = '\0';
-
- /* Setup consumer subdir if none present in the control URI */
- if (strlen(dst_uri->subdir) == 0) {
- ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s",
- hostname, obj->subdir);
- } else {
- ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s",
- hostname, dst_uri->subdir);
- }
- if (ret < 0) {
- PERROR("snprintf set consumer uri subdir");
- goto error;
- }
-
- strncpy(obj->subdir, tmp_path, sizeof(obj->subdir));
- DBG3("Consumer set network uri subdir path %s", tmp_path);
+ if (reply.ret_code == LTTCOMM_CONSUMERD_SUCCESS) {
+ /* All good. */
+ ret = 0;
+ } else {
+ ret = -reply.ret_code;
+ DBG("Consumer ret code %d", ret);
}
end:
- return 0;
-
-error:
- return -1;
+ return ret;
}
/*
- * Send file descriptor to consumer via sock.
+ * Once the ASK_CHANNEL command is sent to the consumer, the channel
+ * information are sent back. This call receives that data and populates key
+ * and stream_count.
+ *
+ * On success return 0 and both key and stream_count are set. On error, a
+ * negative value is sent back and both parameters are untouched.
*/
-int consumer_send_fds(int sock, int *fds, size_t nb_fd)
+int consumer_recv_status_channel(struct consumer_socket *sock,
+ uint64_t *key, unsigned int *stream_count)
{
int ret;
+ struct lttcomm_consumer_status_channel reply;
- assert(fds);
- assert(nb_fd > 0);
+ assert(sock);
+ assert(stream_count);
+ assert(key);
- ret = lttcomm_send_fds_unix_sock(sock, fds, nb_fd);
+ ret = consumer_socket_recv(sock, &reply, sizeof(reply));
if (ret < 0) {
- PERROR("send consumer fds");
- goto error;
+ goto end;
}
-error:
+ /* An error is possible so don't touch the key and stream_count. */
+ if (reply.ret_code != LTTCOMM_CONSUMERD_SUCCESS) {
+ ret = -1;
+ goto end;
+ }
+
+ *key = reply.key;
+ *stream_count = reply.stream_count;
+ ret = 0;
+
+end:
return ret;
}
/*
- * Consumer send channel communication message structure to consumer.
+ * Send destroy relayd command to consumer.
+ *
+ * On success return positive value. On error, negative value.
*/
-int consumer_send_channel(int sock, struct lttcomm_consumer_msg *msg)
+int consumer_send_destroy_relayd(struct consumer_socket *sock,
+ struct consumer_output *consumer)
{
int ret;
+ struct lttcomm_consumer_msg msg;
- assert(msg);
- assert(sock >= 0);
+ assert(consumer);
+ assert(sock);
+
+ DBG2("Sending destroy relayd command to consumer sock %d", *sock->fd_ptr);
- ret = lttcomm_send_unix_sock(sock, msg,
- sizeof(struct lttcomm_consumer_msg));
+ memset(&msg, 0, sizeof(msg));
+ msg.cmd_type = LTTNG_CONSUMER_DESTROY_RELAYD;
+ msg.u.destroy_relayd.net_seq_idx = consumer->net_seq_index;
+
+ pthread_mutex_lock(sock->lock);
+ ret = consumer_socket_send(sock, &msg, sizeof(msg));
if (ret < 0) {
- PERROR("send consumer channel");
goto error;
}
+ /* Don't check the return value. The caller will do it. */
+ ret = consumer_recv_status_reply(sock);
+
+ DBG2("Consumer send destroy relayd command done");
+
error:
+ pthread_mutex_unlock(sock->lock);
return ret;
}
/*
- * Init channel communication message structure.
+ * For each consumer socket in the consumer output object, send a destroy
+ * relayd command.
*/
-void consumer_init_channel_comm_msg(struct lttcomm_consumer_msg *msg,
- enum lttng_consumer_command cmd,
- int channel_key,
- uint64_t max_sb_size,
- uint64_t mmap_len,
- const char *name)
+void consumer_output_send_destroy_relayd(struct consumer_output *consumer)
{
- assert(msg);
+ struct lttng_ht_iter iter;
+ struct consumer_socket *socket;
- /* TODO: Args validation */
+ assert(consumer);
- /* Zeroed structure */
- memset(msg, 0, sizeof(struct lttcomm_consumer_msg));
+ /* Destroy any relayd connection */
+ if (consumer->type == CONSUMER_DST_NET) {
+ rcu_read_lock();
+ cds_lfht_for_each_entry(consumer->socks->ht, &iter.iter, socket,
+ node.node) {
+ int ret;
- /* Send channel */
- msg->cmd_type = cmd;
- msg->u.channel.channel_key = channel_key;
- msg->u.channel.max_sb_size = max_sb_size;
- msg->u.channel.mmap_len = mmap_len;
+ /* Send destroy relayd command */
+ ret = consumer_send_destroy_relayd(socket, consumer);
+ if (ret < 0) {
+ DBG("Unable to send destroy relayd command to consumer");
+ /* Continue since we MUST delete everything at this point. */
+ }
+ }
+ rcu_read_unlock();
+ }
}
/*
- * Init stream communication message structure.
+ * From a consumer_data structure, allocate and add a consumer socket to the
+ * consumer output.
+ *
+ * Return 0 on success, else negative value on error
*/
-void consumer_init_stream_comm_msg(struct lttcomm_consumer_msg *msg,
- enum lttng_consumer_command cmd,
- int channel_key,
- int stream_key,
- uint32_t state,
- enum lttng_event_output output,
- uint64_t mmap_len,
- uid_t uid,
- gid_t gid,
- int net_index,
- unsigned int metadata_flag,
- const char *name,
- const char *pathname)
+int consumer_create_socket(struct consumer_data *data,
+ struct consumer_output *output)
{
- assert(msg);
+ int ret = 0;
+ struct consumer_socket *socket;
- memset(msg, 0, sizeof(struct lttcomm_consumer_msg));
+ assert(data);
- /* TODO: Args validation */
+ if (output == NULL || data->cmd_sock < 0) {
+ /*
+ * Not an error. Possible there is simply not spawned consumer or it's
+ * disabled for the tracing session asking the socket.
+ */
+ goto error;
+ }
- msg->cmd_type = cmd;
- msg->u.stream.channel_key = channel_key;
- msg->u.stream.stream_key = stream_key;
- msg->u.stream.state = state;
- msg->u.stream.output = output;
- msg->u.stream.mmap_len = mmap_len;
- msg->u.stream.uid = uid;
- msg->u.stream.gid = gid;
- msg->u.stream.net_index = net_index;
- msg->u.stream.metadata_flag = metadata_flag;
- strncpy(msg->u.stream.name, name, sizeof(msg->u.stream.name));
- msg->u.stream.name[sizeof(msg->u.stream.name) - 1] = '\0';
- strncpy(msg->u.stream.path_name, pathname,
- sizeof(msg->u.stream.path_name));
- msg->u.stream.path_name[sizeof(msg->u.stream.path_name) - 1] = '\0';
+ rcu_read_lock();
+ socket = consumer_find_socket(data->cmd_sock, output);
+ rcu_read_unlock();
+ if (socket == NULL) {
+ socket = consumer_allocate_socket(&data->cmd_sock);
+ if (socket == NULL) {
+ ret = -1;
+ goto error;
+ }
+
+ socket->registered = 0;
+ socket->lock = &data->lock;
+ rcu_read_lock();
+ consumer_add_socket(socket, output);
+ rcu_read_unlock();
+ }
+
+ socket->type = data->type;
+
+ DBG3("Consumer socket created (fd: %d) and added to output",
+ data->cmd_sock);
+
+error:
+ return ret;
}
/*
- * Send stream communication structure to the consumer.
+ * Return the consumer socket from the given consumer output with the right
+ * bitness. On error, returns NULL.
+ *
+ * The caller MUST acquire a rcu read side lock and keep it until the socket
+ * object reference is not needed anymore.
*/
-int consumer_send_stream(int sock, struct consumer_output *dst,
- struct lttcomm_consumer_msg *msg, int *fds, size_t nb_fd)
+struct consumer_socket *consumer_find_socket_by_bitness(int bits,
+ struct consumer_output *consumer)
{
- int ret;
+ int consumer_fd;
+ struct consumer_socket *socket = NULL;
- assert(msg);
- assert(dst);
-
- switch (dst->type) {
- case CONSUMER_DST_NET:
- /* Consumer should send the stream on the network. */
- msg->u.stream.net_index = dst->net_seq_index;
+ switch (bits) {
+ case 64:
+ consumer_fd = uatomic_read(&ust_consumerd64_fd);
break;
- case CONSUMER_DST_LOCAL:
- /* Add stream file name to stream path */
- strncat(msg->u.stream.path_name, "/", sizeof(msg->u.stream.path_name));
- strncat(msg->u.stream.path_name, msg->u.stream.name,
- sizeof(msg->u.stream.path_name));
- msg->u.stream.path_name[sizeof(msg->u.stream.path_name) - 1] = '\0';
- /* Indicate that the stream is NOT network */
- msg->u.stream.net_index = -1;
+ case 32:
+ consumer_fd = uatomic_read(&ust_consumerd32_fd);
break;
default:
- ERR("Consumer unknown output type (%d)", dst->type);
- ret = -1;
- goto error;
+ assert(0);
+ goto end;
}
- /* Send on socket */
- ret = lttcomm_send_unix_sock(sock, msg,
- sizeof(struct lttcomm_consumer_msg));
- if (ret < 0) {
- PERROR("send consumer stream");
- goto error;
+ socket = consumer_find_socket(consumer_fd, consumer);
+ if (!socket) {
+ ERR("Consumer socket fd %d not found in consumer obj %p",
+ consumer_fd, consumer);
}
- ret = consumer_send_fds(sock, fds, nb_fd);
- if (ret < 0) {
+end:
+ return socket;
+}
+
+/*
+ * Find a consumer_socket in a consumer_output hashtable. Read side lock must
+ * be acquired before calling this function and across use of the
+ * returned consumer_socket.
+ */
+struct consumer_socket *consumer_find_socket(int key,
+ struct consumer_output *consumer)
+{
+ struct lttng_ht_iter iter;
+ struct lttng_ht_node_ulong *node;
+ struct consumer_socket *socket = NULL;
+
+ /* Negative keys are lookup failures */
+ if (key < 0 || consumer == NULL) {
+ return NULL;
+ }
+
+ lttng_ht_lookup(consumer->socks, (void *)((unsigned long) key),
+ &iter);
+ node = lttng_ht_iter_get_node_ulong(&iter);
+ if (node != NULL) {
+ socket = caa_container_of(node, struct consumer_socket, node);
+ }
+
+ return socket;
+}
+
+/*
+ * Allocate a new consumer_socket and return the pointer.
+ */
+struct consumer_socket *consumer_allocate_socket(int *fd)
+{
+ struct consumer_socket *socket = NULL;
+
+ assert(fd);
+
+ socket = zmalloc(sizeof(struct consumer_socket));
+ if (socket == NULL) {
+ PERROR("zmalloc consumer socket");
goto error;
}
+ socket->fd_ptr = fd;
+ lttng_ht_node_init_ulong(&socket->node, *fd);
+
error:
- return ret;
+ return socket;
}
/*
- * Send relayd socket to consumer associated with a session name.
- *
- * On success return positive value. On error, negative value.
+ * Add consumer socket to consumer output object. Read side lock must be
+ * acquired before calling this function.
+ */
+void consumer_add_socket(struct consumer_socket *sock,
+ struct consumer_output *consumer)
+{
+ assert(sock);
+ assert(consumer);
+
+ lttng_ht_add_unique_ulong(consumer->socks, &sock->node);
+}
+
+/*
+ * Delte consumer socket to consumer output object. Read side lock must be
+ * acquired before calling this function.
*/
-int consumer_send_relayd_socket(int consumer_sock,
- struct lttcomm_sock *sock, struct consumer_output *consumer,
- enum lttng_stream_type type)
+void consumer_del_socket(struct consumer_socket *sock,
+ struct consumer_output *consumer)
{
int ret;
- struct lttcomm_consumer_msg msg;
+ struct lttng_ht_iter iter;
- /* Code flow error. Safety net. */
assert(sock);
assert(consumer);
- /* Bail out if consumer is disabled */
- if (!consumer->enabled) {
- ret = LTTCOMM_OK;
- goto error;
- }
+ iter.iter.node = &sock->node.node;
+ ret = lttng_ht_del(consumer->socks, &iter);
+ assert(!ret);
+}
- msg.cmd_type = LTTNG_CONSUMER_ADD_RELAYD_SOCKET;
- /*
- * Assign network consumer output index using the temporary consumer since
- * this call should only be made from within a set_consumer_uri() function
- * call in the session daemon.
- */
- msg.u.relayd_sock.net_index = consumer->net_seq_index;
- msg.u.relayd_sock.type = type;
- memcpy(&msg.u.relayd_sock.sock, sock, sizeof(msg.u.relayd_sock.sock));
+/*
+ * RCU destroy call function.
+ */
+static void destroy_socket_rcu(struct rcu_head *head)
+{
+ struct lttng_ht_node_ulong *node =
+ caa_container_of(head, struct lttng_ht_node_ulong, head);
+ struct consumer_socket *socket =
+ caa_container_of(node, struct consumer_socket, node);
- DBG3("Sending relayd sock info to consumer");
- ret = lttcomm_send_unix_sock(consumer_sock, &msg, sizeof(msg));
- if (ret < 0) {
- PERROR("send consumer relayd socket info");
- goto error;
- }
+ free(socket);
+}
- DBG3("Sending relayd socket file descriptor to consumer");
- ret = consumer_send_fds(consumer_sock, &sock->fd, 1);
- if (ret < 0) {
- goto error;
+/*
+ * Destroy and free socket pointer in a call RCU. Read side lock must be
+ * acquired before calling this function.
+ */
+void consumer_destroy_socket(struct consumer_socket *sock)
+{
+ assert(sock);
+
+ /*
+ * We DO NOT close the file descriptor here since it is global to the
+ * session daemon and is closed only if the consumer dies or a custom
+ * consumer was registered,
+ */
+ if (sock->registered) {
+ DBG3("Consumer socket was registered. Closing fd %d", *sock->fd_ptr);
+ lttcomm_close_unix_sock(*sock->fd_ptr);
}
- DBG2("Consumer relayd socket sent");
+ call_rcu(&sock->node.head, destroy_socket_rcu);
+}
-error:
+/*
+ * Allocate and assign data to a consumer_output object.
+ *
+ * Return pointer to structure.
+ */
+struct consumer_output *consumer_create_output(enum consumer_dst_type type)
+{
+ struct consumer_output *output = NULL;
+
+ output = zmalloc(sizeof(struct consumer_output));
+ if (output == NULL) {
+ PERROR("zmalloc consumer_output");
+ goto error;
+ }
+
+ /* By default, consumer output is enabled */
+ output->enabled = 1;
+ output->type = type;
+ output->net_seq_index = (uint64_t) -1ULL;
+ urcu_ref_init(&output->ref);
+
+ output->socks = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
+
+error:
+ return output;
+}
+
+/*
+ * Iterate over the consumer output socket hash table and destroy them. The
+ * socket file descriptor are only closed if the consumer output was
+ * registered meaning it's an external consumer.
+ */
+void consumer_destroy_output_sockets(struct consumer_output *obj)
+{
+ struct lttng_ht_iter iter;
+ struct consumer_socket *socket;
+
+ if (!obj->socks) {
+ return;
+ }
+
+ rcu_read_lock();
+ cds_lfht_for_each_entry(obj->socks->ht, &iter.iter, socket, node.node) {
+ consumer_del_socket(socket, obj);
+ consumer_destroy_socket(socket);
+ }
+ rcu_read_unlock();
+}
+
+/*
+ * Delete the consumer_output object from the list and free the ptr.
+ *
+ * Should *NOT* be called with RCU read-side lock held.
+ */
+static void consumer_release_output(struct urcu_ref *ref)
+{
+ struct consumer_output *obj =
+ caa_container_of(ref, struct consumer_output, ref);
+
+ consumer_destroy_output_sockets(obj);
+
+ if (obj->socks) {
+ /* Finally destroy HT */
+ ht_cleanup_push(obj->socks);
+ }
+
+ free(obj);
+}
+
+/*
+ * Get the consumer_output object.
+ */
+void consumer_output_get(struct consumer_output *obj)
+{
+ urcu_ref_get(&obj->ref);
+}
+
+/*
+ * Put the consumer_output object.
+ *
+ * Should *NOT* be called with RCU read-side lock held.
+ */
+void consumer_output_put(struct consumer_output *obj)
+{
+ if (!obj) {
+ return;
+ }
+ urcu_ref_put(&obj->ref, consumer_release_output);
+}
+
+/*
+ * Copy consumer output and returned the newly allocated copy.
+ *
+ * Should *NOT* be called with RCU read-side lock held.
+ */
+struct consumer_output *consumer_copy_output(struct consumer_output *obj)
+{
+ int ret;
+ struct consumer_output *output;
+
+ assert(obj);
+
+ output = consumer_create_output(obj->type);
+ if (output == NULL) {
+ goto end;
+ }
+ output->enabled = obj->enabled;
+ output->net_seq_index = obj->net_seq_index;
+ memcpy(output->subdir, obj->subdir, PATH_MAX);
+ output->snapshot = obj->snapshot;
+ output->relay_major_version = obj->relay_major_version;
+ output->relay_minor_version = obj->relay_minor_version;
+ memcpy(&output->dst, &obj->dst, sizeof(output->dst));
+ ret = consumer_copy_sockets(output, obj);
+ if (ret < 0) {
+ goto error_put;
+ }
+end:
+ return output;
+
+error_put:
+ consumer_output_put(output);
+ return NULL;
+}
+
+/*
+ * Copy consumer sockets from src to dst.
+ *
+ * Return 0 on success or else a negative value.
+ */
+int consumer_copy_sockets(struct consumer_output *dst,
+ struct consumer_output *src)
+{
+ int ret = 0;
+ struct lttng_ht_iter iter;
+ struct consumer_socket *socket, *copy_sock;
+
+ assert(dst);
+ assert(src);
+
+ rcu_read_lock();
+ cds_lfht_for_each_entry(src->socks->ht, &iter.iter, socket, node.node) {
+ /* Ignore socket that are already there. */
+ copy_sock = consumer_find_socket(*socket->fd_ptr, dst);
+ if (copy_sock) {
+ continue;
+ }
+
+ /* Create new socket object. */
+ copy_sock = consumer_allocate_socket(socket->fd_ptr);
+ if (copy_sock == NULL) {
+ rcu_read_unlock();
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ copy_sock->registered = socket->registered;
+ /*
+ * This is valid because this lock is shared accross all consumer
+ * object being the global lock of the consumer data structure of the
+ * session daemon.
+ */
+ copy_sock->lock = socket->lock;
+ consumer_add_socket(copy_sock, dst);
+ }
+ rcu_read_unlock();
+
+error:
+ return ret;
+}
+
+/*
+ * Set network URI to the consumer output object.
+ *
+ * Return 0 on success. Return 1 if the URI were equal. Else, negative value on
+ * error.
+ */
+int consumer_set_network_uri(struct consumer_output *obj,
+ struct lttng_uri *uri)
+{
+ int ret;
+ char tmp_path[PATH_MAX];
+ char hostname[HOST_NAME_MAX];
+ struct lttng_uri *dst_uri = NULL;
+
+ /* Code flow error safety net. */
+ assert(obj);
+ assert(uri);
+
+ switch (uri->stype) {
+ case LTTNG_STREAM_CONTROL:
+ dst_uri = &obj->dst.net.control;
+ obj->dst.net.control_isset = 1;
+ if (uri->port == 0) {
+ /* Assign default port. */
+ uri->port = DEFAULT_NETWORK_CONTROL_PORT;
+ } else {
+ if (obj->dst.net.data_isset && uri->port ==
+ obj->dst.net.data.port) {
+ ret = -LTTNG_ERR_INVALID;
+ goto error;
+ }
+ }
+ DBG3("Consumer control URI set with port %d", uri->port);
+ break;
+ case LTTNG_STREAM_DATA:
+ dst_uri = &obj->dst.net.data;
+ obj->dst.net.data_isset = 1;
+ if (uri->port == 0) {
+ /* Assign default port. */
+ uri->port = DEFAULT_NETWORK_DATA_PORT;
+ } else {
+ if (obj->dst.net.control_isset && uri->port ==
+ obj->dst.net.control.port) {
+ ret = -LTTNG_ERR_INVALID;
+ goto error;
+ }
+ }
+ DBG3("Consumer data URI set with port %d", uri->port);
+ break;
+ default:
+ ERR("Set network uri type unknown %d", uri->stype);
+ ret = -LTTNG_ERR_INVALID;
+ goto error;
+ }
+
+ ret = uri_compare(dst_uri, uri);
+ if (!ret) {
+ /* Same URI, don't touch it and return success. */
+ DBG3("URI network compare are the same");
+ goto equal;
+ }
+
+ /* URIs were not equal, replacing it. */
+ memset(dst_uri, 0, sizeof(struct lttng_uri));
+ memcpy(dst_uri, uri, sizeof(struct lttng_uri));
+ obj->type = CONSUMER_DST_NET;
+
+ /* Handle subdir and add hostname in front. */
+ if (dst_uri->stype == LTTNG_STREAM_CONTROL) {
+ /* Get hostname to append it in the pathname */
+ ret = gethostname(hostname, sizeof(hostname));
+ if (ret < 0) {
+ PERROR("gethostname. Fallback on default localhost");
+ strncpy(hostname, "localhost", sizeof(hostname));
+ }
+ hostname[sizeof(hostname) - 1] = '\0';
+
+ /* Setup consumer subdir if none present in the control URI */
+ if (strlen(dst_uri->subdir) == 0) {
+ ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s",
+ hostname, obj->subdir);
+ } else {
+ ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s",
+ hostname, dst_uri->subdir);
+ }
+ if (ret < 0) {
+ PERROR("snprintf set consumer uri subdir");
+ ret = -LTTNG_ERR_NOMEM;
+ goto error;
+ }
+
+ if (lttng_strncpy(obj->subdir, tmp_path, sizeof(obj->subdir))) {
+ ret = -LTTNG_ERR_INVALID;
+ goto error;
+ }
+ DBG3("Consumer set network uri subdir path %s", tmp_path);
+ }
+
+ return 0;
+equal:
+ return 1;
+error:
+ return ret;
+}
+
+/*
+ * Send file descriptor to consumer via sock.
+ */
+int consumer_send_fds(struct consumer_socket *sock, int *fds, size_t nb_fd)
+{
+ int ret;
+
+ assert(fds);
+ assert(sock);
+ assert(nb_fd > 0);
+
+ ret = lttcomm_send_fds_unix_sock(*sock->fd_ptr, fds, nb_fd);
+ if (ret < 0) {
+ /* The above call will print a PERROR on error. */
+ DBG("Error when sending consumer fds on sock %d", *sock->fd_ptr);
+ goto error;
+ }
+
+ ret = consumer_recv_status_reply(sock);
+error:
+ return ret;
+}
+
+/*
+ * Consumer send communication message structure to consumer.
+ */
+int consumer_send_msg(struct consumer_socket *sock,
+ struct lttcomm_consumer_msg *msg)
+{
+ int ret;
+
+ assert(msg);
+ assert(sock);
+
+ ret = consumer_socket_send(sock, msg, sizeof(struct lttcomm_consumer_msg));
+ if (ret < 0) {
+ goto error;
+ }
+
+ ret = consumer_recv_status_reply(sock);
+
+error:
+ return ret;
+}
+
+/*
+ * Consumer send channel communication message structure to consumer.
+ */
+int consumer_send_channel(struct consumer_socket *sock,
+ struct lttcomm_consumer_msg *msg)
+{
+ int ret;
+
+ assert(msg);
+ assert(sock);
+
+ ret = consumer_send_msg(sock, msg);
+ if (ret < 0) {
+ goto error;
+ }
+
+error:
+ return ret;
+}
+
+/*
+ * Populate the given consumer msg structure with the ask_channel command
+ * information.
+ */
+void consumer_init_ask_channel_comm_msg(struct lttcomm_consumer_msg *msg,
+ uint64_t subbuf_size,
+ uint64_t num_subbuf,
+ int overwrite,
+ unsigned int switch_timer_interval,
+ unsigned int read_timer_interval,
+ unsigned int live_timer_interval,
+ unsigned int monitor_timer_interval,
+ int output,
+ int type,
+ uint64_t session_id,
+ const char *pathname,
+ const char *name,
+ uid_t uid,
+ gid_t gid,
+ uint64_t relayd_id,
+ uint64_t key,
+ unsigned char *uuid,
+ uint32_t chan_id,
+ uint64_t tracefile_size,
+ uint64_t tracefile_count,
+ uint64_t session_id_per_pid,
+ unsigned int monitor,
+ uint32_t ust_app_uid,
+ int64_t blocking_timeout,
+ const char *root_shm_path,
+ const char *shm_path)
+{
+ assert(msg);
+
+ /* Zeroed structure */
+ memset(msg, 0, sizeof(struct lttcomm_consumer_msg));
+
+ msg->cmd_type = LTTNG_CONSUMER_ASK_CHANNEL_CREATION;
+ msg->u.ask_channel.subbuf_size = subbuf_size;
+ msg->u.ask_channel.num_subbuf = num_subbuf ;
+ msg->u.ask_channel.overwrite = overwrite;
+ msg->u.ask_channel.switch_timer_interval = switch_timer_interval;
+ msg->u.ask_channel.read_timer_interval = read_timer_interval;
+ msg->u.ask_channel.live_timer_interval = live_timer_interval;
+ msg->u.ask_channel.monitor_timer_interval = monitor_timer_interval;
+ msg->u.ask_channel.output = output;
+ msg->u.ask_channel.type = type;
+ msg->u.ask_channel.session_id = session_id;
+ msg->u.ask_channel.session_id_per_pid = session_id_per_pid;
+ msg->u.ask_channel.uid = uid;
+ msg->u.ask_channel.gid = gid;
+ msg->u.ask_channel.relayd_id = relayd_id;
+ msg->u.ask_channel.key = key;
+ msg->u.ask_channel.chan_id = chan_id;
+ msg->u.ask_channel.tracefile_size = tracefile_size;
+ msg->u.ask_channel.tracefile_count = tracefile_count;
+ msg->u.ask_channel.monitor = monitor;
+ msg->u.ask_channel.ust_app_uid = ust_app_uid;
+ msg->u.ask_channel.blocking_timeout = blocking_timeout;
+
+ memcpy(msg->u.ask_channel.uuid, uuid, sizeof(msg->u.ask_channel.uuid));
+
+ if (pathname) {
+ strncpy(msg->u.ask_channel.pathname, pathname,
+ sizeof(msg->u.ask_channel.pathname));
+ msg->u.ask_channel.pathname[sizeof(msg->u.ask_channel.pathname)-1] = '\0';
+ }
+
+ strncpy(msg->u.ask_channel.name, name, sizeof(msg->u.ask_channel.name));
+ msg->u.ask_channel.name[sizeof(msg->u.ask_channel.name) - 1] = '\0';
+
+ if (root_shm_path) {
+ strncpy(msg->u.ask_channel.root_shm_path, root_shm_path,
+ sizeof(msg->u.ask_channel.root_shm_path));
+ msg->u.ask_channel.root_shm_path[sizeof(msg->u.ask_channel.root_shm_path) - 1] = '\0';
+ }
+ if (shm_path) {
+ strncpy(msg->u.ask_channel.shm_path, shm_path,
+ sizeof(msg->u.ask_channel.shm_path));
+ msg->u.ask_channel.shm_path[sizeof(msg->u.ask_channel.shm_path) - 1] = '\0';
+ }
+}
+
+/*
+ * Init channel communication message structure.
+ */
+void consumer_init_channel_comm_msg(struct lttcomm_consumer_msg *msg,
+ enum lttng_consumer_command cmd,
+ uint64_t channel_key,
+ uint64_t session_id,
+ const char *pathname,
+ uid_t uid,
+ gid_t gid,
+ uint64_t relayd_id,
+ const char *name,
+ unsigned int nb_init_streams,
+ enum lttng_event_output output,
+ int type,
+ uint64_t tracefile_size,
+ uint64_t tracefile_count,
+ unsigned int monitor,
+ unsigned int live_timer_interval,
+ unsigned int monitor_timer_interval)
+{
+ assert(msg);
+
+ /* Zeroed structure */
+ memset(msg, 0, sizeof(struct lttcomm_consumer_msg));
+
+ /* Send channel */
+ msg->cmd_type = cmd;
+ msg->u.channel.channel_key = channel_key;
+ msg->u.channel.session_id = session_id;
+ msg->u.channel.uid = uid;
+ msg->u.channel.gid = gid;
+ msg->u.channel.relayd_id = relayd_id;
+ msg->u.channel.nb_init_streams = nb_init_streams;
+ msg->u.channel.output = output;
+ msg->u.channel.type = type;
+ msg->u.channel.tracefile_size = tracefile_size;
+ msg->u.channel.tracefile_count = tracefile_count;
+ msg->u.channel.monitor = monitor;
+ msg->u.channel.live_timer_interval = live_timer_interval;
+ msg->u.channel.monitor_timer_interval = monitor_timer_interval;
+
+ strncpy(msg->u.channel.pathname, pathname,
+ sizeof(msg->u.channel.pathname));
+ msg->u.channel.pathname[sizeof(msg->u.channel.pathname) - 1] = '\0';
+
+ strncpy(msg->u.channel.name, name, sizeof(msg->u.channel.name));
+ msg->u.channel.name[sizeof(msg->u.channel.name) - 1] = '\0';
+}
+
+/*
+ * Init stream communication message structure.
+ */
+void consumer_init_stream_comm_msg(struct lttcomm_consumer_msg *msg,
+ enum lttng_consumer_command cmd,
+ uint64_t channel_key,
+ uint64_t stream_key,
+ int cpu)
+{
+ assert(msg);
+
+ memset(msg, 0, sizeof(struct lttcomm_consumer_msg));
+
+ msg->cmd_type = cmd;
+ msg->u.stream.channel_key = channel_key;
+ msg->u.stream.stream_key = stream_key;
+ msg->u.stream.cpu = cpu;
+}
+
+void consumer_init_streams_sent_comm_msg(struct lttcomm_consumer_msg *msg,
+ enum lttng_consumer_command cmd,
+ uint64_t channel_key, uint64_t net_seq_idx)
+{
+ assert(msg);
+
+ memset(msg, 0, sizeof(struct lttcomm_consumer_msg));
+
+ msg->cmd_type = cmd;
+ msg->u.sent_streams.channel_key = channel_key;
+ msg->u.sent_streams.net_seq_idx = net_seq_idx;
+}
+
+/*
+ * Send stream communication structure to the consumer.
+ */
+int consumer_send_stream(struct consumer_socket *sock,
+ struct consumer_output *dst, struct lttcomm_consumer_msg *msg,
+ int *fds, size_t nb_fd)
+{
+ int ret;
+
+ assert(msg);
+ assert(dst);
+ assert(sock);
+ assert(fds);
+
+ ret = consumer_send_msg(sock, msg);
+ if (ret < 0) {
+ goto error;
+ }
+
+ ret = consumer_send_fds(sock, fds, nb_fd);
+ if (ret < 0) {
+ goto error;
+ }
+
+error:
+ return ret;
+}
+
+/*
+ * Send relayd socket to consumer associated with a session name.
+ *
+ * On success return positive value. On error, negative value.
+ */
+int consumer_send_relayd_socket(struct consumer_socket *consumer_sock,
+ struct lttcomm_relayd_sock *rsock, struct consumer_output *consumer,
+ enum lttng_stream_type type, uint64_t session_id,
+ char *session_name, char *hostname, int session_live_timer)
+{
+ int ret;
+ struct lttcomm_consumer_msg msg;
+
+ /* Code flow error. Safety net. */
+ assert(rsock);
+ assert(consumer);
+ assert(consumer_sock);
+
+ memset(&msg, 0, sizeof(msg));
+ /* Bail out if consumer is disabled */
+ if (!consumer->enabled) {
+ ret = LTTNG_OK;
+ goto error;
+ }
+
+ if (type == LTTNG_STREAM_CONTROL) {
+ ret = relayd_create_session(rsock,
+ &msg.u.relayd_sock.relayd_session_id,
+ session_name, hostname, session_live_timer,
+ consumer->snapshot);
+ if (ret < 0) {
+ /* Close the control socket. */
+ (void) relayd_close(rsock);
+ goto error;
+ }
+ }
+
+ msg.cmd_type = LTTNG_CONSUMER_ADD_RELAYD_SOCKET;
+ /*
+ * Assign network consumer output index using the temporary consumer since
+ * this call should only be made from within a set_consumer_uri() function
+ * call in the session daemon.
+ */
+ msg.u.relayd_sock.net_index = consumer->net_seq_index;
+ msg.u.relayd_sock.type = type;
+ msg.u.relayd_sock.session_id = session_id;
+ memcpy(&msg.u.relayd_sock.sock, rsock, sizeof(msg.u.relayd_sock.sock));
+
+ DBG3("Sending relayd sock info to consumer on %d", *consumer_sock->fd_ptr);
+ ret = consumer_send_msg(consumer_sock, &msg);
+ if (ret < 0) {
+ goto error;
+ }
+
+ DBG3("Sending relayd socket file descriptor to consumer");
+ ret = consumer_send_fds(consumer_sock, &rsock->sock.fd, 1);
+ if (ret < 0) {
+ goto error;
+ }
+
+ DBG2("Consumer relayd socket sent");
+
+error:
+ return ret;
+}
+
+int consumer_send_channel_monitor_pipe(struct consumer_socket *consumer_sock,
+ int pipe)
+{
+ int ret;
+ struct lttcomm_consumer_msg msg;
+
+ /* Code flow error. Safety net. */
+
+ memset(&msg, 0, sizeof(msg));
+ msg.cmd_type = LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE;
+
+ DBG3("Sending set_channel_monitor_pipe command to consumer");
+ ret = consumer_send_msg(consumer_sock, &msg);
+ if (ret < 0) {
+ goto error;
+ }
+
+ DBG3("Sending channel monitoring pipe %d to consumer on socket %d",
+ pipe, *consumer_sock->fd_ptr);
+ ret = consumer_send_fds(consumer_sock, &pipe, 1);
+ if (ret < 0) {
+ goto error;
+ }
+
+ DBG2("Channel monitoring pipe successfully sent");
+error:
+ return ret;
+}
+
+/*
+ * Set consumer subdirectory using the session name and a generated datetime if
+ * needed. This is appended to the current subdirectory.
+ */
+int consumer_set_subdir(struct consumer_output *consumer,
+ const char *session_name)
+{
+ int ret = 0;
+ unsigned int have_default_name = 0;
+ char datetime[16], tmp_path[PATH_MAX];
+ time_t rawtime;
+ struct tm *timeinfo;
+
+ assert(consumer);
+ assert(session_name);
+
+ memset(tmp_path, 0, sizeof(tmp_path));
+
+ /* Flag if we have a default session. */
+ if (strncmp(session_name, DEFAULT_SESSION_NAME "-",
+ strlen(DEFAULT_SESSION_NAME) + 1) == 0) {
+ have_default_name = 1;
+ } else {
+ /* Get date and time for session path */
+ time(&rawtime);
+ timeinfo = localtime(&rawtime);
+ strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
+ }
+
+ if (have_default_name) {
+ ret = snprintf(tmp_path, sizeof(tmp_path),
+ "%s/%s", consumer->subdir, session_name);
+ } else {
+ ret = snprintf(tmp_path, sizeof(tmp_path),
+ "%s/%s-%s/", consumer->subdir, session_name, datetime);
+ }
+ if (ret < 0) {
+ PERROR("snprintf session name date");
+ goto error;
+ }
+
+ if (lttng_strncpy(consumer->subdir, tmp_path,
+ sizeof(consumer->subdir))) {
+ ret = -EINVAL;
+ goto error;
+ }
+ DBG2("Consumer subdir set to %s", consumer->subdir);
+
+error:
+ return ret;
+}
+
+/*
+ * Ask the consumer if the data is pending for the specific session id.
+ * Returns 1 if data is pending, 0 otherwise, or < 0 on error.
+ */
+int consumer_is_data_pending(uint64_t session_id,
+ struct consumer_output *consumer)
+{
+ int ret;
+ int32_t ret_code = 0; /* Default is that the data is NOT pending */
+ struct consumer_socket *socket;
+ struct lttng_ht_iter iter;
+ struct lttcomm_consumer_msg msg;
+
+ assert(consumer);
+
+ DBG3("Consumer data pending for id %" PRIu64, session_id);
+
+ memset(&msg, 0, sizeof(msg));
+ msg.cmd_type = LTTNG_CONSUMER_DATA_PENDING;
+ msg.u.data_pending.session_id = session_id;
+
+ /* Send command for each consumer */
+ rcu_read_lock();
+ cds_lfht_for_each_entry(consumer->socks->ht, &iter.iter, socket,
+ node.node) {
+ pthread_mutex_lock(socket->lock);
+ ret = consumer_socket_send(socket, &msg, sizeof(msg));
+ if (ret < 0) {
+ pthread_mutex_unlock(socket->lock);
+ goto error_unlock;
+ }
+
+ /*
+ * No need for a recv reply status because the answer to the command is
+ * the reply status message.
+ */
+
+ ret = consumer_socket_recv(socket, &ret_code, sizeof(ret_code));
+ if (ret < 0) {
+ pthread_mutex_unlock(socket->lock);
+ goto error_unlock;
+ }
+ pthread_mutex_unlock(socket->lock);
+
+ if (ret_code == 1) {
+ break;
+ }
+ }
+ rcu_read_unlock();
+
+ DBG("Consumer data is %s pending for session id %" PRIu64,
+ ret_code == 1 ? "" : "NOT", session_id);
+ return ret_code;
+
+error_unlock:
+ rcu_read_unlock();
+ return -1;
+}
+
+/*
+ * Send a flush command to consumer using the given channel key.
+ *
+ * Return 0 on success else a negative value.
+ */
+int consumer_flush_channel(struct consumer_socket *socket, uint64_t key)
+{
+ int ret;
+ struct lttcomm_consumer_msg msg;
+
+ assert(socket);
+
+ DBG2("Consumer flush channel key %" PRIu64, key);
+
+ memset(&msg, 0, sizeof(msg));
+ msg.cmd_type = LTTNG_CONSUMER_FLUSH_CHANNEL;
+ msg.u.flush_channel.key = key;
+
+ pthread_mutex_lock(socket->lock);
+ health_code_update();
+
+ ret = consumer_send_msg(socket, &msg);
+ if (ret < 0) {
+ goto end;
+ }
+
+end:
+ health_code_update();
+ pthread_mutex_unlock(socket->lock);
+ return ret;
+}
+
+/*
+ * Send a clear quiescent command to consumer using the given channel key.
+ *
+ * Return 0 on success else a negative value.
+ */
+int consumer_clear_quiescent_channel(struct consumer_socket *socket, uint64_t key)
+{
+ int ret;
+ struct lttcomm_consumer_msg msg;
+
+ assert(socket);
+
+ DBG2("Consumer clear quiescent channel key %" PRIu64, key);
+
+ memset(&msg, 0, sizeof(msg));
+ msg.cmd_type = LTTNG_CONSUMER_CLEAR_QUIESCENT_CHANNEL;
+ msg.u.clear_quiescent_channel.key = key;
+
+ pthread_mutex_lock(socket->lock);
+ health_code_update();
+
+ ret = consumer_send_msg(socket, &msg);
+ if (ret < 0) {
+ goto end;
+ }
+
+end:
+ health_code_update();
+ pthread_mutex_unlock(socket->lock);
+ return ret;
+}
+
+/*
+ * Send a close metadata command to consumer using the given channel key.
+ * Called with registry lock held.
+ *
+ * Return 0 on success else a negative value.
+ */
+int consumer_close_metadata(struct consumer_socket *socket,
+ uint64_t metadata_key)
+{
+ int ret;
+ struct lttcomm_consumer_msg msg;
+
+ assert(socket);
+
+ DBG2("Consumer close metadata channel key %" PRIu64, metadata_key);
+
+ memset(&msg, 0, sizeof(msg));
+ msg.cmd_type = LTTNG_CONSUMER_CLOSE_METADATA;
+ msg.u.close_metadata.key = metadata_key;
+
+ pthread_mutex_lock(socket->lock);
+ health_code_update();
+
+ ret = consumer_send_msg(socket, &msg);
+ if (ret < 0) {
+ goto end;
+ }
+
+end:
+ health_code_update();
+ pthread_mutex_unlock(socket->lock);
+ return ret;
+}
+
+/*
+ * Send a setup metdata command to consumer using the given channel key.
+ *
+ * Return 0 on success else a negative value.
+ */
+int consumer_setup_metadata(struct consumer_socket *socket,
+ uint64_t metadata_key)
+{
+ int ret;
+ struct lttcomm_consumer_msg msg;
+
+ assert(socket);
+
+ DBG2("Consumer setup metadata channel key %" PRIu64, metadata_key);
+
+ memset(&msg, 0, sizeof(msg));
+ msg.cmd_type = LTTNG_CONSUMER_SETUP_METADATA;
+ msg.u.setup_metadata.key = metadata_key;
+
+ pthread_mutex_lock(socket->lock);
+ health_code_update();
+
+ ret = consumer_send_msg(socket, &msg);
+ if (ret < 0) {
+ goto end;
+ }
+
+end:
+ health_code_update();
+ pthread_mutex_unlock(socket->lock);
+ return ret;
+}
+
+/*
+ * Send metadata string to consumer.
+ * RCU read-side lock must be held to guarantee existence of socket.
+ *
+ * Return 0 on success else a negative value.
+ */
+int consumer_push_metadata(struct consumer_socket *socket,
+ uint64_t metadata_key, char *metadata_str, size_t len,
+ size_t target_offset, uint64_t version)
+{
+ int ret;
+ struct lttcomm_consumer_msg msg;
+
+ assert(socket);
+
+ DBG2("Consumer push metadata to consumer socket %d", *socket->fd_ptr);
+
+ pthread_mutex_lock(socket->lock);
+
+ memset(&msg, 0, sizeof(msg));
+ msg.cmd_type = LTTNG_CONSUMER_PUSH_METADATA;
+ msg.u.push_metadata.key = metadata_key;
+ msg.u.push_metadata.target_offset = target_offset;
+ msg.u.push_metadata.len = len;
+ msg.u.push_metadata.version = version;
+
+ health_code_update();
+ ret = consumer_send_msg(socket, &msg);
+ if (ret < 0 || len == 0) {
+ goto end;
+ }
+
+ DBG3("Consumer pushing metadata on sock %d of len %zu", *socket->fd_ptr,
+ len);
+
+ ret = consumer_socket_send(socket, metadata_str, len);
+ if (ret < 0) {
+ goto end;
+ }
+
+ health_code_update();
+ ret = consumer_recv_status_reply(socket);
+ if (ret < 0) {
+ goto end;
+ }
+
+end:
+ pthread_mutex_unlock(socket->lock);
+ health_code_update();
+ return ret;
+}
+
+/*
+ * Ask the consumer to snapshot a specific channel using the key.
+ *
+ * Return 0 on success or else a negative error.
+ */
+int consumer_snapshot_channel(struct consumer_socket *socket, uint64_t key,
+ struct snapshot_output *output, int metadata, uid_t uid, gid_t gid,
+ const char *session_path, int wait, uint64_t nb_packets_per_stream)
+{
+ int ret;
+ struct lttcomm_consumer_msg msg;
+
+ assert(socket);
+ assert(output);
+ assert(output->consumer);
+
+ DBG("Consumer snapshot channel key %" PRIu64, key);
+
+ memset(&msg, 0, sizeof(msg));
+ msg.cmd_type = LTTNG_CONSUMER_SNAPSHOT_CHANNEL;
+ msg.u.snapshot_channel.key = key;
+ msg.u.snapshot_channel.nb_packets_per_stream = nb_packets_per_stream;
+ msg.u.snapshot_channel.metadata = metadata;
+
+ if (output->consumer->type == CONSUMER_DST_NET) {
+ msg.u.snapshot_channel.relayd_id = output->consumer->net_seq_index;
+ msg.u.snapshot_channel.use_relayd = 1;
+ ret = snprintf(msg.u.snapshot_channel.pathname,
+ sizeof(msg.u.snapshot_channel.pathname),
+ "%s/%s-%s-%" PRIu64 "%s", output->consumer->subdir,
+ output->name, output->datetime, output->nb_snapshot,
+ session_path);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto error;
+ }
+ } else {
+ ret = snprintf(msg.u.snapshot_channel.pathname,
+ sizeof(msg.u.snapshot_channel.pathname),
+ "%s/%s-%s-%" PRIu64 "%s", output->consumer->dst.trace_path,
+ output->name, output->datetime, output->nb_snapshot,
+ session_path);
+ if (ret < 0) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto error;
+ }
+ msg.u.snapshot_channel.relayd_id = (uint64_t) -1ULL;
+
+ /* Create directory. Ignore if exist. */
+ ret = run_as_mkdir_recursive(msg.u.snapshot_channel.pathname,
+ S_IRWXU | S_IRWXG, uid, gid);
+ if (ret < 0) {
+ if (errno != EEXIST) {
+ ERR("Trace directory creation error");
+ goto error;
+ }
+ }
+ }
+
+ health_code_update();
+ ret = consumer_send_msg(socket, &msg);
+ if (ret < 0) {
+ goto error;
+ }
+
+error:
+ health_code_update();
+ return ret;
+}
+
+/*
+ * Ask the consumer the number of discarded events for a channel.
+ */
+int consumer_get_discarded_events(uint64_t session_id, uint64_t channel_key,
+ struct consumer_output *consumer, uint64_t *discarded)
+{
+ int ret;
+ struct consumer_socket *socket;
+ struct lttng_ht_iter iter;
+ struct lttcomm_consumer_msg msg;
+
+ assert(consumer);
+
+ DBG3("Consumer discarded events id %" PRIu64, session_id);
+
+ memset(&msg, 0, sizeof(msg));
+ msg.cmd_type = LTTNG_CONSUMER_DISCARDED_EVENTS;
+ msg.u.discarded_events.session_id = session_id;
+ msg.u.discarded_events.channel_key = channel_key;
+
+ *discarded = 0;
+
+ /* Send command for each consumer */
+ rcu_read_lock();
+ cds_lfht_for_each_entry(consumer->socks->ht, &iter.iter, socket,
+ node.node) {
+ uint64_t consumer_discarded = 0;
+ pthread_mutex_lock(socket->lock);
+ ret = consumer_socket_send(socket, &msg, sizeof(msg));
+ if (ret < 0) {
+ pthread_mutex_unlock(socket->lock);
+ goto end;
+ }
+
+ /*
+ * No need for a recv reply status because the answer to the
+ * command is the reply status message.
+ */
+ ret = consumer_socket_recv(socket, &consumer_discarded,
+ sizeof(consumer_discarded));
+ if (ret < 0) {
+ ERR("get discarded events");
+ pthread_mutex_unlock(socket->lock);
+ goto end;
+ }
+ pthread_mutex_unlock(socket->lock);
+ *discarded += consumer_discarded;
+ }
+ ret = 0;
+ DBG("Consumer discarded %" PRIu64 " events in session id %" PRIu64,
+ *discarded, session_id);
+
+end:
+ rcu_read_unlock();
+ return ret;
+}
+
+/*
+ * Ask the consumer the number of lost packets for a channel.
+ */
+int consumer_get_lost_packets(uint64_t session_id, uint64_t channel_key,
+ struct consumer_output *consumer, uint64_t *lost)
+{
+ int ret;
+ struct consumer_socket *socket;
+ struct lttng_ht_iter iter;
+ struct lttcomm_consumer_msg msg;
+
+ assert(consumer);
+
+ DBG3("Consumer lost packets id %" PRIu64, session_id);
+
+ memset(&msg, 0, sizeof(msg));
+ msg.cmd_type = LTTNG_CONSUMER_LOST_PACKETS;
+ msg.u.lost_packets.session_id = session_id;
+ msg.u.lost_packets.channel_key = channel_key;
+
+ *lost = 0;
+
+ /* Send command for each consumer */
+ rcu_read_lock();
+ cds_lfht_for_each_entry(consumer->socks->ht, &iter.iter, socket,
+ node.node) {
+ uint64_t consumer_lost = 0;
+ pthread_mutex_lock(socket->lock);
+ ret = consumer_socket_send(socket, &msg, sizeof(msg));
+ if (ret < 0) {
+ pthread_mutex_unlock(socket->lock);
+ goto end;
+ }
+
+ /*
+ * No need for a recv reply status because the answer to the
+ * command is the reply status message.
+ */
+ ret = consumer_socket_recv(socket, &consumer_lost,
+ sizeof(consumer_lost));
+ if (ret < 0) {
+ ERR("get lost packets");
+ pthread_mutex_unlock(socket->lock);
+ goto end;
+ }
+ pthread_mutex_unlock(socket->lock);
+ *lost += consumer_lost;
+ }
+ ret = 0;
+ DBG("Consumer lost %" PRIu64 " packets in session id %" PRIu64,
+ *lost, session_id);
+
+end:
+ rcu_read_unlock();
return ret;
}