X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fconsumer.c;h=33ccfe2248c91bd50fa0a4c94489790404e24264;hp=ee6f3c3ff8e9ddb5c614d6b9c60d5f2d592e21ff;hb=491d15395b58df09f8a3e7ba7404eb1f46392b79;hpb=52898cb1ecfe2cf37bda9b95039826da517b9a5b diff --git a/src/bin/lttng-sessiond/consumer.c b/src/bin/lttng-sessiond/consumer.c index ee6f3c3ff..33ccfe224 100644 --- a/src/bin/lttng-sessiond/consumer.c +++ b/src/bin/lttng-sessiond/consumer.c @@ -15,7 +15,7 @@ * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ -#define _GNU_SOURCE +#define _LGPL_SOURCE #include #include #include @@ -28,9 +28,10 @@ #include #include #include +#include #include "consumer.h" -#include "health.h" +#include "health-sessiond.h" #include "ust-app.h" #include "utils.h" @@ -48,11 +49,11 @@ int consumer_socket_send(struct consumer_socket *socket, void *msg, size_t len) ssize_t size; assert(socket); - assert(socket->fd); + assert(socket->fd_ptr); assert(msg); /* Consumer socket is invalid. Stopping. */ - fd = *socket->fd; + fd = *socket->fd_ptr; if (fd < 0) { goto error; } @@ -62,13 +63,13 @@ int consumer_socket_send(struct consumer_socket *socket, void *msg, size_t len) /* 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 flagging it - * invalid and closing it. + * 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 = -1; + *socket->fd_ptr = -1; goto error; } @@ -92,11 +93,11 @@ int consumer_socket_recv(struct consumer_socket *socket, void *msg, size_t len) ssize_t size; assert(socket); - assert(socket->fd); + assert(socket->fd_ptr); assert(msg); /* Consumer socket is invalid. Stopping. */ - fd = *socket->fd; + fd = *socket->fd_ptr; if (fd < 0) { goto error; } @@ -106,13 +107,13 @@ int consumer_socket_recv(struct consumer_socket *socket, void *msg, size_t len) /* 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 flagging it - * invalid and closing it. + * 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 = -1; + *socket->fd_ptr = -1; goto error; } @@ -141,7 +142,7 @@ int consumer_recv_status_reply(struct consumer_socket *sock) goto end; } - if (reply.ret_code == LTTNG_OK) { + if (reply.ret_code == LTTCOMM_CONSUMERD_SUCCESS) { /* All good. */ ret = 0; } else { @@ -177,13 +178,14 @@ int consumer_recv_status_channel(struct consumer_socket *sock, } /* An error is possible so don't touch the key and stream_count. */ - if (reply.ret_code != LTTNG_OK) { + if (reply.ret_code != LTTCOMM_CONSUMERD_SUCCESS) { ret = -1; goto end; } *key = reply.key; *stream_count = reply.stream_count; + ret = 0; end: return ret; @@ -203,8 +205,9 @@ int consumer_send_destroy_relayd(struct consumer_socket *sock, assert(consumer); assert(sock); - DBG2("Sending destroy relayd command to consumer sock %d", *sock->fd); + DBG2("Sending destroy relayd command to consumer sock %d", *sock->fd_ptr); + memset(&msg, 0, sizeof(msg)); msg.cmd_type = LTTNG_CONSUMER_DESTROY_RELAYD; msg.u.destroy_relayd.net_seq_idx = consumer->net_seq_index; @@ -378,7 +381,7 @@ struct consumer_socket *consumer_allocate_socket(int *fd) goto error; } - socket->fd = fd; + socket->fd_ptr = fd; lttng_ht_node_init_ulong(&socket->node, *fd); error: @@ -443,8 +446,8 @@ void consumer_destroy_socket(struct consumer_socket *sock) * consumer was registered, */ if (sock->registered) { - DBG3("Consumer socket was registered. Closing fd %d", *sock->fd); - lttcomm_close_unix_sock(*sock->fd); + DBG3("Consumer socket was registered. Closing fd %d", *sock->fd_ptr); + lttcomm_close_unix_sock(*sock->fd_ptr); } call_rcu(&sock->node.head, destroy_socket_rcu); @@ -469,6 +472,7 @@ struct consumer_output *consumer_create_output(enum consumer_dst_type type) 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); @@ -503,11 +507,10 @@ void consumer_destroy_output_sockets(struct consumer_output *obj) * * Should *NOT* be called with RCU read-side lock held. */ -void consumer_destroy_output(struct consumer_output *obj) +static void consumer_release_output(struct urcu_ref *ref) { - if (obj == NULL) { - return; - } + struct consumer_output *obj = + caa_container_of(ref, struct consumer_output, ref); consumer_destroy_output_sockets(obj); @@ -519,6 +522,27 @@ void consumer_destroy_output(struct consumer_output *obj) 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. * @@ -527,33 +551,30 @@ void consumer_destroy_output(struct consumer_output *obj) struct consumer_output *consumer_copy_output(struct consumer_output *obj) { int ret; - struct lttng_ht *tmp_ht_ptr; struct consumer_output *output; assert(obj); output = consumer_create_output(obj->type); if (output == NULL) { - goto error; + goto end; } - /* Avoid losing the HT reference after the memcpy() */ - tmp_ht_ptr = output->socks; - - memcpy(output, obj, sizeof(struct consumer_output)); - - /* Putting back the HT pointer and start copying socket(s). */ - output->socks = tmp_ht_ptr; - + 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 malloc_error; + goto error_put; } - -error: +end: return output; -malloc_error: - consumer_destroy_output(output); +error_put: + consumer_output_put(output); return NULL; } @@ -575,13 +596,13 @@ int consumer_copy_sockets(struct consumer_output *dst, 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, dst); + copy_sock = consumer_find_socket(*socket->fd_ptr, dst); if (copy_sock) { continue; } /* Create new socket object. */ - copy_sock = consumer_allocate_socket(socket->fd); + copy_sock = consumer_allocate_socket(socket->fd_ptr); if (copy_sock == NULL) { rcu_read_unlock(); ret = -ENOMEM; @@ -694,7 +715,10 @@ int consumer_set_network_uri(struct consumer_output *obj, goto error; } - strncpy(obj->subdir, tmp_path, sizeof(obj->subdir)); + 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); } @@ -714,18 +738,16 @@ int consumer_send_fds(struct consumer_socket *sock, int *fds, size_t nb_fd) assert(fds); assert(sock); - assert(sock->fd); assert(nb_fd > 0); - ret = lttcomm_send_fds_unix_sock(*sock->fd, fds, nb_fd); + 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); + DBG("Error when sending consumer fds on sock %d", *sock->fd_ptr); goto error; } ret = consumer_recv_status_reply(sock); - error: return ret; } @@ -740,7 +762,6 @@ int consumer_send_msg(struct consumer_socket *sock, assert(msg); assert(sock); - assert(sock->fd); ret = consumer_socket_send(sock, msg, sizeof(struct lttcomm_consumer_msg)); if (ret < 0) { @@ -763,7 +784,6 @@ int consumer_send_channel(struct consumer_socket *sock, assert(msg); assert(sock); - assert(sock->fd); ret = consumer_send_msg(sock, msg); if (ret < 0) { @@ -784,6 +804,8 @@ void consumer_init_ask_channel_comm_msg(struct lttcomm_consumer_msg *msg, 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, @@ -799,7 +821,10 @@ void consumer_init_ask_channel_comm_msg(struct lttcomm_consumer_msg *msg, uint64_t tracefile_count, uint64_t session_id_per_pid, unsigned int monitor, - uint32_t ust_app_uid) + uint32_t ust_app_uid, + int64_t blocking_timeout, + const char *root_shm_path, + const char *shm_path) { assert(msg); @@ -812,6 +837,8 @@ void consumer_init_ask_channel_comm_msg(struct lttcomm_consumer_msg *msg, 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; @@ -825,6 +852,7 @@ void consumer_init_ask_channel_comm_msg(struct lttcomm_consumer_msg *msg, 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)); @@ -836,6 +864,17 @@ void consumer_init_ask_channel_comm_msg(struct lttcomm_consumer_msg *msg, 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'; + } } /* @@ -855,7 +894,9 @@ void consumer_init_channel_comm_msg(struct lttcomm_consumer_msg *msg, int type, uint64_t tracefile_size, uint64_t tracefile_count, - unsigned int monitor) + unsigned int monitor, + unsigned int live_timer_interval, + unsigned int monitor_timer_interval) { assert(msg); @@ -875,6 +916,8 @@ void consumer_init_channel_comm_msg(struct lttcomm_consumer_msg *msg, 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)); @@ -903,6 +946,19 @@ void consumer_init_stream_comm_msg(struct lttcomm_consumer_msg *msg, 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. */ @@ -915,7 +971,6 @@ int consumer_send_stream(struct consumer_socket *sock, assert(msg); assert(dst); assert(sock); - assert(sock->fd); assert(fds); ret = consumer_send_msg(sock, msg); @@ -939,7 +994,8 @@ error: */ 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) + 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; @@ -948,14 +1004,26 @@ int consumer_send_relayd_socket(struct consumer_socket *consumer_sock, assert(rsock); assert(consumer); assert(consumer_sock); - assert(consumer_sock->fd); + 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 @@ -967,7 +1035,7 @@ int consumer_send_relayd_socket(struct consumer_socket *consumer_sock, 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); + 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; @@ -985,6 +1053,35 @@ 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. @@ -1026,7 +1123,11 @@ int consumer_set_subdir(struct consumer_output *consumer, goto error; } - strncpy(consumer->subdir, tmp_path, sizeof(consumer->subdir)); + if (lttng_strncpy(consumer->subdir, tmp_path, + sizeof(consumer->subdir))) { + ret = -EINVAL; + goto error; + } DBG2("Consumer subdir set to %s", consumer->subdir); error: @@ -1034,11 +1135,8 @@ error: } /* - * Ask the consumer if the data is ready to read (NOT pending) for the specific - * session id. - * - * This function has a different behavior with the consumer i.e. that it waits - * for a reply from the consumer if yes or no the data is pending. + * 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) @@ -1051,19 +1149,16 @@ int consumer_is_data_pending(uint64_t session_id, assert(consumer); - msg.cmd_type = LTTNG_CONSUMER_DATA_PENDING; + 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; - DBG3("Consumer data pending for id %" PRIu64, session_id); - /* Send command for each consumer */ rcu_read_lock(); cds_lfht_for_each_entry(consumer->socks->ht, &iter.iter, socket, node.node) { - /* Code flow error */ - assert(socket->fd); - pthread_mutex_lock(socket->lock); ret = consumer_socket_send(socket, &msg, sizeof(msg)); if (ret < 0) { @@ -1109,10 +1204,10 @@ int consumer_flush_channel(struct consumer_socket *socket, uint64_t key) struct lttcomm_consumer_msg msg; assert(socket); - assert(socket->fd); 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; @@ -1131,7 +1226,40 @@ end: } /* - * Send a close metdata command to consumer using the given channel key. + * 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. */ @@ -1142,10 +1270,10 @@ int consumer_close_metadata(struct consumer_socket *socket, struct lttcomm_consumer_msg msg; assert(socket); - assert(socket->fd); 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; @@ -1175,10 +1303,10 @@ int consumer_setup_metadata(struct consumer_socket *socket, struct lttcomm_consumer_msg msg; assert(socket); - assert(socket->fd); 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; @@ -1197,26 +1325,30 @@ end: } /* - * Send metadata string to consumer. Socket lock MUST be acquired. + * 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) + size_t target_offset, uint64_t version) { int ret; struct lttcomm_consumer_msg msg; assert(socket); - assert(socket->fd); - DBG2("Consumer push metadata to consumer socket %d", *socket->fd); + 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); @@ -1224,7 +1356,8 @@ int consumer_push_metadata(struct consumer_socket *socket, goto end; } - DBG3("Consumer pushing metadata on sock %d of len %zu", *socket->fd, len); + 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) { @@ -1238,6 +1371,7 @@ int consumer_push_metadata(struct consumer_socket *socket, } end: + pthread_mutex_unlock(socket->lock); health_code_update(); return ret; } @@ -1249,13 +1383,12 @@ end: */ 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, int max_stream_size) + const char *session_path, int wait, uint64_t nb_packets_per_stream) { int ret; struct lttcomm_consumer_msg msg; assert(socket); - assert(socket->fd); assert(output); assert(output->consumer); @@ -1264,7 +1397,7 @@ int consumer_snapshot_channel(struct consumer_socket *socket, uint64_t key, memset(&msg, 0, sizeof(msg)); msg.cmd_type = LTTNG_CONSUMER_SNAPSHOT_CHANNEL; msg.u.snapshot_channel.key = key; - msg.u.snapshot_channel.max_stream_size = max_stream_size; + 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) { @@ -1295,7 +1428,7 @@ int consumer_snapshot_channel(struct consumer_socket *socket, uint64_t key, ret = run_as_mkdir_recursive(msg.u.snapshot_channel.pathname, S_IRWXU | S_IRWXG, uid, gid); if (ret < 0) { - if (ret != -EEXIST) { + if (errno != EEXIST) { ERR("Trace directory creation error"); goto error; } @@ -1312,3 +1445,117 @@ 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; +}