#include <urcu/list.h>
#include <signal.h>
+#include <bin/lttng-consumerd/health-consumerd.h>
#include <common/common.h>
#include <common/sessiond-comm/sessiond-comm.h>
#include <common/relayd/relayd.h>
#include <common/compat/fcntl.h>
+#include <common/compat/endian.h>
#include <common/consumer-metadata-cache.h>
+#include <common/consumer-stream.h>
#include <common/consumer-timer.h>
#include <common/utils.h>
+#include <common/index/index.h>
#include "ust-consumer.h"
cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head,
send_node) {
+
+ health_code_update();
+
cds_list_del(&stream->send_node);
ustctl_destroy_stream(stream->ustream);
free(stream);
*/
if (channel->uchan) {
lttng_ustconsumer_del_channel(channel);
+ lttng_ustconsumer_free_channel(channel);
}
free(channel);
}
*/
static struct lttng_consumer_channel *allocate_channel(uint64_t session_id,
const char *pathname, const char *name, uid_t uid, gid_t gid,
- int relayd_id, uint64_t key, enum lttng_event_output output,
- uint64_t tracefile_size, uint64_t tracefile_count)
+ uint64_t relayd_id, uint64_t key, enum lttng_event_output output,
+ uint64_t tracefile_size, uint64_t tracefile_count,
+ uint64_t session_id_per_pid, unsigned int monitor,
+ unsigned int live_timer_interval)
{
assert(pathname);
assert(name);
- return consumer_allocate_channel(key, session_id, pathname, name, uid, gid,
- relayd_id, output, tracefile_size, tracefile_count);
+ return consumer_allocate_channel(key, session_id, pathname, name, uid,
+ gid, relayd_id, output, tracefile_size,
+ tracefile_count, session_id_per_pid, monitor, live_timer_interval);
}
/*
channel->session_id,
cpu,
&alloc_ret,
- channel->type);
+ channel->type,
+ channel->monitor);
if (stream == NULL) {
switch (alloc_ret) {
case -ENOENT:
/* Get the right pipe where the stream will be sent. */
if (stream->metadata_flag) {
+ ret = consumer_add_metadata_stream(stream);
+ if (ret) {
+ ERR("Consumer add metadata stream %" PRIu64 " failed.",
+ stream->key);
+ goto error;
+ }
stream_pipe = ctx->consumer_metadata_pipe;
} else {
+ ret = consumer_add_data_stream(stream);
+ if (ret) {
+ ERR("Consumer add stream %" PRIu64 " failed.",
+ stream->key);
+ goto error;
+ }
stream_pipe = ctx->consumer_data_pipe;
}
+ /*
+ * From this point on, the stream's ownership has been moved away from
+ * the channel and becomes globally visible.
+ */
+ stream->globally_visible = 1;
+
ret = lttng_pipe_write(stream_pipe, &stream, sizeof(stream));
if (ret < 0) {
ERR("Consumer write %s stream to pipe %d",
stream->metadata_flag ? "metadata" : "data",
lttng_pipe_get_writefd(stream_pipe));
- }
-
- return ret;
-}
-
-/*
- * Search for a relayd object related to the stream. If found, send the stream
- * to the relayd.
- *
- * On success, returns 0 else a negative value.
- */
-static int send_stream_to_relayd(struct lttng_consumer_stream *stream)
-{
- int ret = 0;
- struct consumer_relayd_sock_pair *relayd;
-
- assert(stream);
-
- relayd = consumer_find_relayd(stream->net_seq_idx);
- if (relayd != NULL) {
- pthread_mutex_lock(&relayd->ctrl_sock_mutex);
- /* Add stream on the relayd */
- ret = relayd_add_stream(&relayd->control_sock, stream->name,
- stream->chan->pathname, &stream->relayd_stream_id,
- stream->chan->tracefile_size,
- stream->chan->tracefile_count);
- pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
- if (ret < 0) {
- goto error;
+ if (stream->metadata_flag) {
+ consumer_del_stream_for_metadata(stream);
+ } else {
+ consumer_del_stream_for_data(stream);
}
- } else if (stream->net_seq_idx != (uint64_t) -1ULL) {
- ERR("Network sequence index %" PRIu64 " unknown. Not adding stream.",
- stream->net_seq_idx);
- ret = -1;
- goto error;
}
-
error:
return ret;
}
*/
while ((ustream = ustctl_create_stream(channel->uchan, cpu))) {
int wait_fd;
+ int ust_metadata_pipe[2];
- wait_fd = ustctl_stream_get_wait_fd(ustream);
+ health_code_update();
+
+ if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && channel->monitor) {
+ ret = utils_create_pipe_cloexec_nonblock(ust_metadata_pipe);
+ if (ret < 0) {
+ ERR("Create ust metadata poll pipe");
+ goto error;
+ }
+ wait_fd = ust_metadata_pipe[0];
+ } else {
+ wait_fd = ustctl_stream_get_wait_fd(ustream);
+ }
/* Allocate consumer stream object. */
stream = allocate_stream(cpu, wait_fd, channel, ctx, &ret);
* Increment channel refcount since the channel reference has now been
* assigned in the allocation process above.
*/
- uatomic_inc(&stream->chan->refcount);
+ if (stream->chan->monitor) {
+ uatomic_inc(&stream->chan->refcount);
+ }
/*
* Order is important this is why a list is used. On error, the caller
/* Keep stream reference when creating metadata. */
if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) {
channel->metadata_stream = stream;
+ if (channel->monitor) {
+ /* Set metadata poll pipe if we created one */
+ memcpy(stream->ust_metadata_poll_pipe,
+ ust_metadata_pipe,
+ sizeof(ust_metadata_pipe));
+ }
}
}
assert(stream);
assert(sock >= 0);
- DBG2("UST consumer sending stream %" PRIu64 " to sessiond", stream->key);
+ DBG("UST consumer sending stream %" PRIu64 " to sessiond", stream->key);
/* Send stream to session daemon. */
ret = ustctl_send_stream_to_sessiond(sock, stream->ustream);
struct lttng_consumer_channel *channel,
struct lttng_consumer_local_data *ctx, int *relayd_error)
{
- int ret;
+ int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS;
struct lttng_consumer_stream *stream;
+ uint64_t net_seq_idx = -1ULL;
assert(channel);
assert(ctx);
DBG("UST consumer sending channel %s to sessiond", channel->name);
+ if (channel->relayd_id != (uint64_t) -1ULL) {
+ cds_list_for_each_entry(stream, &channel->streams.head, send_node) {
+
+ health_code_update();
+
+ /* Try to send the stream to the relayd if one is available. */
+ ret = consumer_send_relayd_stream(stream, stream->chan->pathname);
+ if (ret < 0) {
+ /*
+ * Flag that the relayd was the problem here probably due to a
+ * communicaton error on the socket.
+ */
+ if (relayd_error) {
+ *relayd_error = 1;
+ }
+ ret_code = LTTNG_ERR_RELAYD_CONNECT_FAIL;
+ }
+ if (net_seq_idx == -1ULL) {
+ net_seq_idx = stream->net_seq_idx;
+ }
+ }
+ }
+
+ /* Inform sessiond that we are about to send channel and streams. */
+ ret = consumer_send_status_msg(sock, ret_code);
+ if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) {
+ /*
+ * Either the session daemon is not responding or the relayd died so we
+ * stop now.
+ */
+ goto error;
+ }
+
/* Send channel to sessiond. */
ret = ustctl_send_channel_to_sessiond(sock, channel->uchan);
if (ret < 0) {
/* The channel was sent successfully to the sessiond at this point. */
cds_list_for_each_entry(stream, &channel->streams.head, send_node) {
- /* Try to send the stream to the relayd if one is available. */
- ret = send_stream_to_relayd(stream);
- if (ret < 0) {
- /*
- * Flag that the relayd was the problem here probably due to a
- * communicaton error on the socket.
- */
- if (relayd_error) {
- *relayd_error = 1;
- }
- goto error;
- }
+
+ health_code_update();
/* Send stream to session daemon. */
ret = send_sessiond_stream(sock, stream);
return 0;
error:
+ if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) {
+ ret = -1;
+ }
return ret;
}
/* The reply msg status is handled in the following call. */
ret = create_ust_channel(attr, &channel->uchan);
if (ret < 0) {
- goto error;
+ goto end;
}
channel->wait_fd = ustctl_channel_get_wait_fd(channel->uchan);
- if (ret < 0) {
- goto error;
+ /*
+ * For the snapshots (no monitor), we create the metadata streams
+ * on demand, not during the channel creation.
+ */
+ if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && !channel->monitor) {
+ ret = 0;
+ goto end;
}
/* Open all streams for this channel. */
ret = create_ust_streams(channel, ctx);
if (ret < 0) {
- goto error;
+ goto end;
}
-error:
+end:
return ret;
}
/* Send streams to the corresponding thread. */
cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head,
send_node) {
+
+ health_code_update();
+
/* Sending the stream to the thread. */
ret = send_stream_to_thread(stream, ctx);
if (ret < 0) {
* If we are unable to send the stream to the thread, there is
* a big problem so just stop everything.
*/
+ /* Remove node from the channel stream list. */
+ cds_list_del(&stream->send_node);
goto error;
}
/* Remove node from the channel stream list. */
cds_list_del(&stream->send_node);
- }
-error:
- return ret;
-}
-
-/*
- * Write metadata to the given channel using ustctl to convert the string to
- * the ringbuffer.
- * Called only from consumer_metadata_cache_write.
- * The metadata cache lock MUST be acquired to write in the cache.
- *
- * Return 0 on success else a negative value.
- */
-int lttng_ustconsumer_push_metadata(struct lttng_consumer_channel *metadata,
- const char *metadata_str, uint64_t target_offset, uint64_t len)
-{
- int ret;
-
- assert(metadata);
- assert(metadata_str);
-
- DBG("UST consumer writing metadata to channel %s", metadata->name);
-
- assert(target_offset <= metadata->metadata_cache->max_offset);
- ret = ustctl_write_metadata_to_channel(metadata->uchan,
- metadata_str + target_offset, len);
- if (ret < 0) {
- ERR("ustctl write metadata fail with ret %d, len %" PRIu64, ret, len);
- goto error;
}
- ustctl_flush_buffer(metadata->metadata_stream->ustream, 1);
-
error:
return ret;
}
cds_lfht_for_each_entry_duplicate(ht->ht,
ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct,
&channel->key, &iter.iter, stream, node_channel_id.node) {
- ustctl_flush_buffer(stream->ustream, 1);
+
+ health_code_update();
+
+ ustctl_flush_buffer(stream->ustream, 1);
}
error:
rcu_read_unlock();
channel = consumer_find_channel(chan_key);
if (!channel) {
- ERR("UST consumer close metadata %" PRIu64 " not found", chan_key);
+ /*
+ * This is possible if the metadata thread has issue a delete because
+ * the endpoint point of the stream hung up. There is no way the
+ * session daemon can know about it thus use a DBG instead of an actual
+ * error.
+ */
+ DBG("UST consumer close metadata %" PRIu64 " not found", chan_key);
ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
goto error;
}
pthread_mutex_lock(&consumer_data.lock);
- if (!cds_lfht_is_node_deleted(&channel->node.node)) {
- if (channel->switch_timer_enabled == 1) {
- DBG("Deleting timer on metadata channel");
- consumer_timer_switch_stop(channel);
- }
- ret = ustctl_stream_close_wakeup_fd(channel->metadata_stream->ustream);
- if (ret < 0) {
- ERR("UST consumer unable to close fd of metadata (ret: %d)", ret);
- ret = LTTCOMM_CONSUMERD_ERROR_METADATA;
- goto error_unlock;
- }
+ pthread_mutex_lock(&channel->lock);
+
+ if (cds_lfht_is_node_deleted(&channel->node.node)) {
+ goto error_unlock;
}
+ lttng_ustconsumer_close_metadata(channel);
+
error_unlock:
+ pthread_mutex_unlock(&channel->lock);
pthread_mutex_unlock(&consumer_data.lock);
error:
return ret;
if (!metadata) {
ERR("UST consumer push metadata %" PRIu64 " not found", key);
ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
- goto error;
+ goto end;
+ }
+
+ /*
+ * In no monitor mode, the metadata channel has no stream(s) so skip the
+ * ownership transfer to the metadata thread.
+ */
+ if (!metadata->monitor) {
+ DBG("Metadata channel in no monitor");
+ ret = 0;
+ goto end;
}
/*
if (cds_list_empty(&metadata->streams.head)) {
ERR("Metadata channel key %" PRIu64 ", no stream available.", key);
ret = LTTCOMM_CONSUMERD_ERROR_METADATA;
- goto error;
+ goto error_no_stream;
}
/* Send metadata stream to relayd if needed. */
- ret = send_stream_to_relayd(metadata->metadata_stream);
- if (ret < 0) {
- ret = LTTCOMM_CONSUMERD_ERROR_METADATA;
- goto error;
+ if (metadata->metadata_stream->net_seq_idx != (uint64_t) -1ULL) {
+ ret = consumer_send_relayd_stream(metadata->metadata_stream,
+ metadata->pathname);
+ if (ret < 0) {
+ ret = LTTCOMM_CONSUMERD_ERROR_METADATA;
+ goto error;
+ }
+ ret = consumer_send_relayd_streams_sent(
+ metadata->metadata_stream->net_seq_idx);
+ if (ret < 0) {
+ ret = LTTCOMM_CONSUMERD_RELAYD_FAIL;
+ goto error;
+ }
}
ret = send_streams_to_thread(metadata, ctx);
assert(cds_list_empty(&metadata->streams.head));
ret = 0;
+ goto end;
error:
+ /*
+ * Delete metadata channel on error. At this point, the metadata stream can
+ * NOT be monitored by the metadata thread thus having the guarantee that
+ * the stream is still in the local stream list of the channel. This call
+ * will make sure to clean that list.
+ */
+ consumer_stream_destroy(metadata->metadata_stream, NULL);
+ cds_list_del(&metadata->metadata_stream->send_node);
+ metadata->metadata_stream = NULL;
+error_no_stream:
+end:
return ret;
}
/*
- * Receive the metadata updates from the sessiond.
+ * Snapshot the whole metadata.
+ *
+ * Returns 0 on success, < 0 on error
*/
-int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset,
- uint64_t len, struct lttng_consumer_channel *channel)
+static int snapshot_metadata(uint64_t key, char *path, uint64_t relayd_id,
+ struct lttng_consumer_local_data *ctx)
{
- int ret, ret_code = LTTNG_OK;
- char *metadata_str;
+ int ret = 0;
+ struct lttng_consumer_channel *metadata_channel;
+ struct lttng_consumer_stream *metadata_stream;
- DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len);
+ assert(path);
+ assert(ctx);
- metadata_str = zmalloc(len * sizeof(char));
- if (!metadata_str) {
- PERROR("zmalloc metadata string");
- ret_code = LTTCOMM_CONSUMERD_ENOMEM;
- goto end;
+ DBG("UST consumer snapshot metadata with key %" PRIu64 " at path %s",
+ key, path);
+
+ rcu_read_lock();
+
+ metadata_channel = consumer_find_channel(key);
+ if (!metadata_channel) {
+ ERR("UST snapshot metadata channel not found for key %" PRIu64,
+ key);
+ ret = -1;
+ goto error;
}
+ assert(!metadata_channel->monitor);
- /* Receive metadata string. */
- ret = lttcomm_recv_unix_sock(sock, metadata_str, len);
+ health_code_update();
+
+ /*
+ * Ask the sessiond if we have new metadata waiting and update the
+ * consumer metadata cache.
+ */
+ ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 1);
if (ret < 0) {
- /* Session daemon is dead so return gracefully. */
- ret_code = ret;
- goto end_free;
+ goto error;
}
- pthread_mutex_lock(&channel->metadata_cache->lock);
- ret = consumer_metadata_cache_write(channel, offset, len, metadata_str);
+ health_code_update();
+
+ /*
+ * The metadata stream is NOT created in no monitor mode when the channel
+ * is created on a sessiond ask channel command.
+ */
+ ret = create_ust_streams(metadata_channel, ctx);
if (ret < 0) {
- /* Unable to handle metadata. Notify session daemon. */
- ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA;
+ goto error;
}
- pthread_mutex_unlock(&channel->metadata_cache->lock);
- while (consumer_metadata_cache_flushed(channel, offset + len)) {
- DBG("Waiting for metadata to be flushed");
- usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME);
+ metadata_stream = metadata_channel->metadata_stream;
+ assert(metadata_stream);
+
+ if (relayd_id != (uint64_t) -1ULL) {
+ metadata_stream->net_seq_idx = relayd_id;
+ ret = consumer_send_relayd_stream(metadata_stream, path);
+ if (ret < 0) {
+ goto error_stream;
+ }
+ } else {
+ ret = utils_create_stream_file(path, metadata_stream->name,
+ metadata_stream->chan->tracefile_size,
+ metadata_stream->tracefile_count_current,
+ metadata_stream->uid, metadata_stream->gid, NULL);
+ if (ret < 0) {
+ goto error_stream;
+ }
+ metadata_stream->out_fd = ret;
+ metadata_stream->tracefile_size_current = 0;
}
-end_free:
- free(metadata_str);
-end:
- return ret_code;
+ do {
+ health_code_update();
+
+ ret = lttng_consumer_read_subbuffer(metadata_stream, ctx);
+ if (ret < 0) {
+ goto error_stream;
+ }
+ } while (ret > 0);
+
+error_stream:
+ /*
+ * Clean up the stream completly because the next snapshot will use a new
+ * metadata stream.
+ */
+ consumer_stream_destroy(metadata_stream, NULL);
+ cds_list_del(&metadata_stream->send_node);
+ metadata_channel->metadata_stream = NULL;
+
+error:
+ rcu_read_unlock();
+ return ret;
}
/*
- * Receive command from session daemon and process it.
+ * Take a snapshot of all the stream of a channel.
*
- * Return 1 on success else a negative value or 0.
+ * Returns 0 on success, < 0 on error
*/
-int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx,
- int sock, struct pollfd *consumer_sockpoll)
+static int snapshot_channel(uint64_t key, char *path, uint64_t relayd_id,
+ uint64_t nb_packets_per_stream, struct lttng_consumer_local_data *ctx)
{
- ssize_t ret;
- enum lttng_error_code ret_code = LTTNG_OK;
- struct lttcomm_consumer_msg msg;
- struct lttng_consumer_channel *channel = NULL;
+ int ret;
+ unsigned use_relayd = 0;
+ unsigned long consumed_pos, produced_pos;
+ struct lttng_consumer_channel *channel;
+ struct lttng_consumer_stream *stream;
- ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg));
- if (ret != sizeof(msg)) {
- DBG("Consumer received unexpected message size %zd (expects %zu)",
- ret, sizeof(msg));
- lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD);
- /*
- * The ret value might 0 meaning an orderly shutdown but this is ok
- * since the caller handles this.
- */
- return ret;
- }
- if (msg.cmd_type == LTTNG_CONSUMER_STOP) {
- /*
- * Notify the session daemon that the command is completed.
- *
- * On transport layer error, the function call will print an error
- * message so handling the returned code is a bit useless since we
- * return an error code anyway.
- */
- (void) consumer_send_status_msg(sock, ret_code);
- return -ENOENT;
- }
+ assert(path);
+ assert(ctx);
- /* relayd needs RCU read-side lock */
rcu_read_lock();
- switch (msg.cmd_type) {
- case LTTNG_CONSUMER_ADD_RELAYD_SOCKET:
- {
- /* Session daemon status message are handled in the following call. */
- ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index,
- msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll,
- &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id);
- goto end_nosignal;
+ if (relayd_id != (uint64_t) -1ULL) {
+ use_relayd = 1;
}
- case LTTNG_CONSUMER_DESTROY_RELAYD:
- {
- uint64_t index = msg.u.destroy_relayd.net_seq_idx;
- struct consumer_relayd_sock_pair *relayd;
- DBG("UST consumer destroying relayd %" PRIu64, index);
+ channel = consumer_find_channel(key);
+ if (!channel) {
+ ERR("UST snapshot channel not found for key %" PRIu64, key);
+ ret = -1;
+ goto error;
+ }
+ assert(!channel->monitor);
+ DBG("UST consumer snapshot channel %" PRIu64, key);
- /* Get relayd reference if exists. */
- relayd = consumer_find_relayd(index);
- if (relayd == NULL) {
- DBG("Unable to find relayd %" PRIu64, index);
- ret_code = LTTNG_ERR_NO_CONSUMER;
- }
+ cds_list_for_each_entry(stream, &channel->streams.head, send_node) {
- /*
- * Each relayd socket pair has a refcount of stream attached to it
- * which tells if the relayd is still active or not depending on the
- * refcount value.
- *
- * This will set the destroy flag of the relayd object and destroy it
- * if the refcount reaches zero when called.
- *
- * The destroy can happen either here or when a stream fd hangs up.
- */
- if (relayd) {
- consumer_flag_relayd_for_destroy(relayd);
- }
+ health_code_update();
- goto end_msg_sessiond;
- }
- case LTTNG_CONSUMER_UPDATE_STREAM:
- {
+ /* Lock stream because we are about to change its state. */
+ pthread_mutex_lock(&stream->lock);
+ stream->net_seq_idx = relayd_id;
+
+ if (use_relayd) {
+ ret = consumer_send_relayd_stream(stream, path);
+ if (ret < 0) {
+ goto error_unlock;
+ }
+ } else {
+ ret = utils_create_stream_file(path, stream->name,
+ stream->chan->tracefile_size,
+ stream->tracefile_count_current,
+ stream->uid, stream->gid, NULL);
+ if (ret < 0) {
+ goto error_unlock;
+ }
+ stream->out_fd = ret;
+ stream->tracefile_size_current = 0;
+
+ DBG("UST consumer snapshot stream %s/%s (%" PRIu64 ")", path,
+ stream->name, stream->key);
+ }
+ if (relayd_id != -1ULL) {
+ ret = consumer_send_relayd_streams_sent(relayd_id);
+ if (ret < 0) {
+ goto error_unlock;
+ }
+ }
+
+ ustctl_flush_buffer(stream->ustream, 1);
+
+ ret = lttng_ustconsumer_take_snapshot(stream);
+ if (ret < 0) {
+ ERR("Taking UST snapshot");
+ goto error_unlock;
+ }
+
+ ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos);
+ if (ret < 0) {
+ ERR("Produced UST snapshot position");
+ goto error_unlock;
+ }
+
+ ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos);
+ if (ret < 0) {
+ ERR("Consumerd UST snapshot position");
+ goto error_unlock;
+ }
+
+ /*
+ * The original value is sent back if max stream size is larger than
+ * the possible size of the snapshot. Also, we assume that the session
+ * daemon should never send a maximum stream size that is lower than
+ * subbuffer size.
+ */
+ consumed_pos = consumer_get_consume_start_pos(consumed_pos,
+ produced_pos, nb_packets_per_stream,
+ stream->max_sb_size);
+
+ while (consumed_pos < produced_pos) {
+ ssize_t read_len;
+ unsigned long len, padded_len;
+
+ health_code_update();
+
+ DBG("UST consumer taking snapshot at pos %lu", consumed_pos);
+
+ ret = ustctl_get_subbuf(stream->ustream, &consumed_pos);
+ if (ret < 0) {
+ if (ret != -EAGAIN) {
+ PERROR("ustctl_get_subbuf snapshot");
+ goto error_close_stream;
+ }
+ DBG("UST consumer get subbuf failed. Skipping it.");
+ consumed_pos += stream->max_sb_size;
+ continue;
+ }
+
+ ret = ustctl_get_subbuf_size(stream->ustream, &len);
+ if (ret < 0) {
+ ERR("Snapshot ustctl_get_subbuf_size");
+ goto error_put_subbuf;
+ }
+
+ ret = ustctl_get_padded_subbuf_size(stream->ustream, &padded_len);
+ if (ret < 0) {
+ ERR("Snapshot ustctl_get_padded_subbuf_size");
+ goto error_put_subbuf;
+ }
+
+ read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len,
+ padded_len - len, NULL);
+ if (use_relayd) {
+ if (read_len != len) {
+ ret = -EPERM;
+ goto error_put_subbuf;
+ }
+ } else {
+ if (read_len != padded_len) {
+ ret = -EPERM;
+ goto error_put_subbuf;
+ }
+ }
+
+ ret = ustctl_put_subbuf(stream->ustream);
+ if (ret < 0) {
+ ERR("Snapshot ustctl_put_subbuf");
+ goto error_close_stream;
+ }
+ consumed_pos += stream->max_sb_size;
+ }
+
+ /* Simply close the stream so we can use it on the next snapshot. */
+ consumer_stream_close(stream);
+ pthread_mutex_unlock(&stream->lock);
+ }
+
+ rcu_read_unlock();
+ return 0;
+
+error_put_subbuf:
+ if (ustctl_put_subbuf(stream->ustream) < 0) {
+ ERR("Snapshot ustctl_put_subbuf");
+ }
+error_close_stream:
+ consumer_stream_close(stream);
+error_unlock:
+ pthread_mutex_unlock(&stream->lock);
+error:
+ rcu_read_unlock();
+ return ret;
+}
+
+/*
+ * Receive the metadata updates from the sessiond. Supports receiving
+ * overlapping metadata, but is needs to always belong to a contiguous
+ * range starting from 0.
+ * Be careful about the locks held when calling this function: it needs
+ * the metadata cache flush to concurrently progress in order to
+ * complete.
+ */
+int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset,
+ uint64_t len, struct lttng_consumer_channel *channel,
+ int timer, int wait)
+{
+ int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS;
+ char *metadata_str;
+
+ DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len);
+
+ metadata_str = zmalloc(len * sizeof(char));
+ if (!metadata_str) {
+ PERROR("zmalloc metadata string");
+ ret_code = LTTCOMM_CONSUMERD_ENOMEM;
+ goto end;
+ }
+
+ health_code_update();
+
+ /* Receive metadata string. */
+ ret = lttcomm_recv_unix_sock(sock, metadata_str, len);
+ if (ret < 0) {
+ /* Session daemon is dead so return gracefully. */
+ ret_code = ret;
+ goto end_free;
+ }
+
+ health_code_update();
+
+ pthread_mutex_lock(&channel->metadata_cache->lock);
+ ret = consumer_metadata_cache_write(channel, offset, len, metadata_str);
+ if (ret < 0) {
+ /* Unable to handle metadata. Notify session daemon. */
+ ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA;
+ /*
+ * Skip metadata flush on write error since the offset and len might
+ * not have been updated which could create an infinite loop below when
+ * waiting for the metadata cache to be flushed.
+ */
+ pthread_mutex_unlock(&channel->metadata_cache->lock);
+ goto end_free;
+ }
+ pthread_mutex_unlock(&channel->metadata_cache->lock);
+
+ if (!wait) {
+ goto end_free;
+ }
+ while (consumer_metadata_cache_flushed(channel, offset + len, timer)) {
+ DBG("Waiting for metadata to be flushed");
+
+ health_code_update();
+
+ usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME);
+ }
+
+end_free:
+ free(metadata_str);
+end:
+ return ret_code;
+}
+
+/*
+ * Receive command from session daemon and process it.
+ *
+ * Return 1 on success else a negative value or 0.
+ */
+int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx,
+ int sock, struct pollfd *consumer_sockpoll)
+{
+ ssize_t ret;
+ enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS;
+ struct lttcomm_consumer_msg msg;
+ struct lttng_consumer_channel *channel = NULL;
+
+ health_code_update();
+
+ ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg));
+ if (ret != sizeof(msg)) {
+ DBG("Consumer received unexpected message size %zd (expects %zu)",
+ ret, sizeof(msg));
+ /*
+ * The ret value might 0 meaning an orderly shutdown but this is ok
+ * since the caller handles this.
+ */
+ if (ret > 0) {
+ lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD);
+ ret = -1;
+ }
+ return ret;
+ }
+
+ health_code_update();
+
+ /* deprecated */
+ assert(msg.cmd_type != LTTNG_CONSUMER_STOP);
+
+ health_code_update();
+
+ /* relayd needs RCU read-side lock */
+ rcu_read_lock();
+
+ switch (msg.cmd_type) {
+ case LTTNG_CONSUMER_ADD_RELAYD_SOCKET:
+ {
+ /* Session daemon status message are handled in the following call. */
+ ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index,
+ msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll,
+ &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id,
+ msg.u.relayd_sock.relayd_session_id);
+ goto end_nosignal;
+ }
+ case LTTNG_CONSUMER_DESTROY_RELAYD:
+ {
+ uint64_t index = msg.u.destroy_relayd.net_seq_idx;
+ struct consumer_relayd_sock_pair *relayd;
+
+ DBG("UST consumer destroying relayd %" PRIu64, index);
+
+ /* Get relayd reference if exists. */
+ relayd = consumer_find_relayd(index);
+ if (relayd == NULL) {
+ DBG("Unable to find relayd %" PRIu64, index);
+ ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL;
+ }
+
+ /*
+ * Each relayd socket pair has a refcount of stream attached to it
+ * which tells if the relayd is still active or not depending on the
+ * refcount value.
+ *
+ * This will set the destroy flag of the relayd object and destroy it
+ * if the refcount reaches zero when called.
+ *
+ * The destroy can happen either here or when a stream fd hangs up.
+ */
+ if (relayd) {
+ consumer_flag_relayd_for_destroy(relayd);
+ }
+
+ goto end_msg_sessiond;
+ }
+ case LTTNG_CONSUMER_UPDATE_STREAM:
+ {
rcu_read_unlock();
return -ENOSYS;
}
sizeof(is_data_pending));
if (ret < 0) {
DBG("Error when sending the data pending ret code: %d", ret);
+ goto error_fatal;
}
/*
msg.u.ask_channel.relayd_id, msg.u.ask_channel.key,
(enum lttng_event_output) msg.u.ask_channel.output,
msg.u.ask_channel.tracefile_size,
- msg.u.ask_channel.tracefile_count);
+ msg.u.ask_channel.tracefile_count,
+ msg.u.ask_channel.session_id_per_pid,
+ msg.u.ask_channel.monitor,
+ msg.u.ask_channel.live_timer_interval);
if (!channel) {
goto end_channel_error;
}
+ /*
+ * Assign UST application UID to the channel. This value is ignored for
+ * per PID buffers. This is specific to UST thus setting this after the
+ * allocation.
+ */
+ channel->ust_app_uid = msg.u.ask_channel.ust_app_uid;
+
/* Build channel attributes from received message. */
attr.subbuf_size = msg.u.ask_channel.subbuf_size;
attr.num_subbuf = msg.u.ask_channel.num_subbuf;
attr.chan_id = msg.u.ask_channel.chan_id;
memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid));
- /* Translate the event output type to UST. */
- switch (channel->output) {
- case LTTNG_EVENT_SPLICE:
- /* Splice not supported so fallback on mmap(). */
+ /* Match channel buffer type to the UST abi. */
+ switch (msg.u.ask_channel.output) {
case LTTNG_EVENT_MMAP:
default:
- attr.output = CONSUMER_CHANNEL_MMAP;
+ attr.output = LTTNG_UST_MMAP;
break;
- };
+ }
/* Translate and save channel type. */
switch (msg.u.ask_channel.type) {
goto error_fatal;
};
+ health_code_update();
+
ret = ask_channel(ctx, sock, channel, &attr);
if (ret < 0) {
goto end_channel_error;
}
consumer_timer_switch_start(channel, attr.switch_timer_interval);
attr.switch_timer_interval = 0;
+ } else {
+ consumer_timer_live_start(channel,
+ msg.u.ask_channel.live_timer_interval);
}
+ health_code_update();
+
/*
* Add the channel to the internal state AFTER all streams were created
* and successfully sent to session daemon. This way, all streams must
}
consumer_metadata_cache_destroy(channel);
}
+ if (channel->live_timer_enabled == 1) {
+ consumer_timer_live_stop(channel);
+ }
goto end_channel_error;
}
+ health_code_update();
+
/*
* Channel and streams are now created. Inform the session daemon that
* everything went well and should wait to receive the channel and
ret = consumer_send_status_channel(sock, channel);
if (ret < 0) {
/*
- * There is probably a problem on the socket so the poll will get
- * it and clean everything up.
+ * There is probably a problem on the socket.
*/
- goto end_nosignal;
+ goto error_fatal;
}
break;
channel = consumer_find_channel(key);
if (!channel) {
ERR("UST consumer get channel key %" PRIu64 " not found", key);
- ret_code = LTTNG_ERR_UST_CHAN_NOT_FOUND;
+ ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND;
goto end_msg_sessiond;
}
- /* Inform sessiond that we are about to send channel and streams. */
- ret = consumer_send_status_msg(sock, LTTNG_OK);
- if (ret < 0) {
- /* Somehow, the session daemon is not responding anymore. */
- goto end_nosignal;
- }
+ health_code_update();
/* Send everything to sessiond. */
ret = send_sessiond_channel(sock, channel, ctx, &relayd_err);
/*
* We were unable to send to the relayd the stream so avoid
* sending back a fatal error to the thread since this is OK
- * and the consumer can continue its work.
+ * and the consumer can continue its work. The above call
+ * has sent the error status message to the sessiond.
*/
- ret_code = LTTNG_ERR_RELAYD_CONNECT_FAIL;
- goto end_msg_sessiond;
+ goto end_nosignal;
}
/*
* The communicaton was broken hence there is a bad state between
goto error_fatal;
}
+ health_code_update();
+
+ /*
+ * In no monitor mode, the streams ownership is kept inside the channel
+ * so don't send them to the data thread.
+ */
+ if (!channel->monitor) {
+ goto end_msg_sessiond;
+ }
+
ret = send_streams_to_thread(channel, ctx);
if (ret < 0) {
/*
}
/* List MUST be empty after or else it could be reused. */
assert(cds_list_empty(&channel->streams.head));
-
goto end_msg_sessiond;
}
case LTTNG_CONSUMER_DESTROY_CHANNEL:
channel = consumer_find_channel(key);
if (!channel) {
- ERR("UST consumer push metadata %" PRIu64 " not found", key);
- ret_code = LTTNG_ERR_UST_CHAN_NOT_FOUND;
+ /*
+ * This is possible if the metadata creation on the consumer side
+ * is in flight vis-a-vis a concurrent push metadata from the
+ * session daemon. Simply return that the channel failed and the
+ * session daemon will handle that message correctly considering
+ * that this race is acceptable thus the DBG() statement here.
+ */
+ DBG("UST consumer push metadata %" PRIu64 " not found", key);
+ ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL;
+ goto end_msg_sessiond;
+ }
+
+ health_code_update();
+
+ if (!len) {
+ /*
+ * There is nothing to receive. We have simply
+ * checked whether the channel can be found.
+ */
+ ret_code = LTTCOMM_CONSUMERD_SUCCESS;
goto end_msg_sessiond;
}
/* Tell session daemon we are ready to receive the metadata. */
- ret = consumer_send_status_msg(sock, LTTNG_OK);
+ ret = consumer_send_status_msg(sock, LTTCOMM_CONSUMERD_SUCCESS);
if (ret < 0) {
/* Somehow, the session daemon is not responding anymore. */
goto error_fatal;
}
+ health_code_update();
+
/* Wait for more data. */
- if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) {
- goto end_nosignal;
+ health_poll_entry();
+ ret = lttng_consumer_poll_socket(consumer_sockpoll);
+ health_poll_exit();
+ if (ret) {
+ goto error_fatal;
}
+ health_code_update();
+
ret = lttng_ustconsumer_recv_metadata(sock, key, offset,
- len, channel);
+ len, channel, 0, 1);
if (ret < 0) {
/* error receiving from sessiond */
- goto end_nosignal;
+ goto error_fatal;
} else {
ret_code = ret;
goto end_msg_sessiond;
}
goto end_msg_sessiond;
}
+ case LTTNG_CONSUMER_SNAPSHOT_CHANNEL:
+ {
+ if (msg.u.snapshot_channel.metadata) {
+ ret = snapshot_metadata(msg.u.snapshot_channel.key,
+ msg.u.snapshot_channel.pathname,
+ msg.u.snapshot_channel.relayd_id,
+ ctx);
+ if (ret < 0) {
+ ERR("Snapshot metadata failed");
+ ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA;
+ }
+ } else {
+ ret = snapshot_channel(msg.u.snapshot_channel.key,
+ msg.u.snapshot_channel.pathname,
+ msg.u.snapshot_channel.relayd_id,
+ msg.u.snapshot_channel.nb_packets_per_stream,
+ ctx);
+ if (ret < 0) {
+ ERR("Snapshot channel failed");
+ ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL;
+ }
+ }
+
+ health_code_update();
+ ret = consumer_send_status_msg(sock, ret_code);
+ if (ret < 0) {
+ /* Somehow, the session daemon is not responding anymore. */
+ goto end_nosignal;
+ }
+ health_code_update();
+ break;
+ }
default:
break;
}
end_nosignal:
rcu_read_unlock();
+ health_code_update();
+
/*
* Return 1 to indicate success since the 0 value can be a socket
* shutdown during the recv() or send() call.
* the caller because the session daemon socket management is done
* elsewhere. Returning a negative code or 0 will shutdown the consumer.
*/
- (void) consumer_send_status_msg(sock, ret_code);
+ ret = consumer_send_status_msg(sock, ret_code);
+ if (ret < 0) {
+ goto error_fatal;
+ }
rcu_read_unlock();
+
+ health_code_update();
+
return 1;
end_channel_error:
if (channel) {
goto error_fatal;
}
rcu_read_unlock();
+
+ health_code_update();
+
return 1;
error_fatal:
rcu_read_unlock();
}
/*
- * Called when the stream signal the consumer that it has hang up.
+ * Get the consumed position
+ *
+ * Returns 0 on success, < 0 on error
*/
-void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream)
+int lttng_ustconsumer_get_consumed_snapshot(
+ struct lttng_consumer_stream *stream, unsigned long *pos)
{
assert(stream);
assert(stream->ustream);
+ assert(pos);
- ustctl_flush_buffer(stream->ustream, 0);
- stream->hangup_flush_done = 1;
+ return ustctl_snapshot_get_consumed(stream->ustream, pos);
}
-void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan)
+void lttng_ustconsumer_flush_buffer(struct lttng_consumer_stream *stream,
+ int producer)
{
- assert(chan);
- assert(chan->uchan);
+ assert(stream);
+ assert(stream->ustream);
+
+ ustctl_flush_buffer(stream->ustream, producer);
+}
+
+int lttng_ustconsumer_get_current_timestamp(
+ struct lttng_consumer_stream *stream, uint64_t *ts)
+{
+ assert(stream);
+ assert(stream->ustream);
+ assert(ts);
+
+ return ustctl_get_current_timestamp(stream->ustream, ts);
+}
+
+/*
+ * Called when the stream signal the consumer that it has hang up.
+ */
+void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream)
+{
+ assert(stream);
+ assert(stream->ustream);
+
+ ustctl_flush_buffer(stream->ustream, 0);
+ stream->hangup_flush_done = 1;
+}
+
+void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan)
+{
+ assert(chan);
+ assert(chan->uchan);
if (chan->switch_timer_enabled == 1) {
consumer_timer_switch_stop(chan);
}
+}
+
+void lttng_ustconsumer_free_channel(struct lttng_consumer_channel *chan)
+{
+ assert(chan);
+ assert(chan->uchan);
+
consumer_metadata_cache_destroy(chan);
ustctl_destroy_channel(chan->uchan);
}
ustctl_destroy_stream(stream->ustream);
}
+int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream)
+{
+ assert(stream);
+ assert(stream->ustream);
+
+ return ustctl_stream_get_wakeup_fd(stream->ustream);
+}
+
+int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream)
+{
+ assert(stream);
+ assert(stream->ustream);
+
+ return ustctl_stream_close_wakeup_fd(stream->ustream);
+}
+
+/*
+ * Populate index values of a UST stream. Values are set in big endian order.
+ *
+ * Return 0 on success or else a negative value.
+ */
+static int get_index_values(struct ctf_packet_index *index,
+ struct ustctl_consumer_stream *ustream)
+{
+ int ret;
+
+ ret = ustctl_get_timestamp_begin(ustream, &index->timestamp_begin);
+ if (ret < 0) {
+ PERROR("ustctl_get_timestamp_begin");
+ goto error;
+ }
+ index->timestamp_begin = htobe64(index->timestamp_begin);
+
+ ret = ustctl_get_timestamp_end(ustream, &index->timestamp_end);
+ if (ret < 0) {
+ PERROR("ustctl_get_timestamp_end");
+ goto error;
+ }
+ index->timestamp_end = htobe64(index->timestamp_end);
+
+ ret = ustctl_get_events_discarded(ustream, &index->events_discarded);
+ if (ret < 0) {
+ PERROR("ustctl_get_events_discarded");
+ goto error;
+ }
+ index->events_discarded = htobe64(index->events_discarded);
+
+ ret = ustctl_get_content_size(ustream, &index->content_size);
+ if (ret < 0) {
+ PERROR("ustctl_get_content_size");
+ goto error;
+ }
+ index->content_size = htobe64(index->content_size);
+
+ ret = ustctl_get_packet_size(ustream, &index->packet_size);
+ if (ret < 0) {
+ PERROR("ustctl_get_packet_size");
+ goto error;
+ }
+ index->packet_size = htobe64(index->packet_size);
+
+ ret = ustctl_get_stream_id(ustream, &index->stream_id);
+ if (ret < 0) {
+ PERROR("ustctl_get_stream_id");
+ goto error;
+ }
+ index->stream_id = htobe64(index->stream_id);
+
+error:
+ return ret;
+}
+
+/*
+ * Write up to one packet from the metadata cache to the channel.
+ *
+ * Returns the number of bytes pushed in the cache, or a negative value
+ * on error.
+ */
+static
+int commit_one_metadata_packet(struct lttng_consumer_stream *stream)
+{
+ ssize_t write_len;
+ int ret;
+
+ pthread_mutex_lock(&stream->chan->metadata_cache->lock);
+ if (stream->chan->metadata_cache->max_offset
+ == stream->ust_metadata_pushed) {
+ ret = 0;
+ goto end;
+ }
+
+ write_len = ustctl_write_one_packet_to_channel(stream->chan->uchan,
+ &stream->chan->metadata_cache->data[stream->ust_metadata_pushed],
+ stream->chan->metadata_cache->max_offset
+ - stream->ust_metadata_pushed);
+ assert(write_len != 0);
+ if (write_len < 0) {
+ ERR("Writing one metadata packet");
+ ret = -1;
+ goto end;
+ }
+ stream->ust_metadata_pushed += write_len;
+
+ assert(stream->chan->metadata_cache->max_offset >=
+ stream->ust_metadata_pushed);
+ ret = write_len;
+
+end:
+ pthread_mutex_unlock(&stream->chan->metadata_cache->lock);
+ return ret;
+}
+
+
+/*
+ * Sync metadata meaning request them to the session daemon and snapshot to the
+ * metadata thread can consumer them.
+ *
+ * Metadata stream lock is held here, but we need to release it when
+ * interacting with sessiond, else we cause a deadlock with live
+ * awaiting on metadata to be pushed out.
+ *
+ * Return 0 if new metadatda is available, EAGAIN if the metadata stream
+ * is empty or a negative value on error.
+ */
+int lttng_ustconsumer_sync_metadata(struct lttng_consumer_local_data *ctx,
+ struct lttng_consumer_stream *metadata)
+{
+ int ret;
+ int retry = 0;
+
+ assert(ctx);
+ assert(metadata);
+
+ pthread_mutex_unlock(&metadata->lock);
+ /*
+ * Request metadata from the sessiond, but don't wait for the flush
+ * because we locked the metadata thread.
+ */
+ ret = lttng_ustconsumer_request_metadata(ctx, metadata->chan, 0, 0);
+ if (ret < 0) {
+ goto end;
+ }
+ pthread_mutex_lock(&metadata->lock);
+
+ ret = commit_one_metadata_packet(metadata);
+ if (ret <= 0) {
+ goto end;
+ } else if (ret > 0) {
+ retry = 1;
+ }
+
+ ustctl_flush_buffer(metadata->ustream, 1);
+ ret = ustctl_snapshot(metadata->ustream);
+ if (ret < 0) {
+ if (errno != EAGAIN) {
+ ERR("Sync metadata, taking UST snapshot");
+ goto end;
+ }
+ DBG("No new metadata when syncing them.");
+ /* No new metadata, exit. */
+ ret = ENODATA;
+ goto end;
+ }
+
+ /*
+ * After this flush, we still need to extract metadata.
+ */
+ if (retry) {
+ ret = EAGAIN;
+ }
+
+end:
+ return ret;
+}
+
+/*
+ * Return 0 on success else a negative value.
+ */
+static int notify_if_more_data(struct lttng_consumer_stream *stream,
+ struct lttng_consumer_local_data *ctx)
+{
+ int ret;
+ struct ustctl_consumer_stream *ustream;
+
+ assert(stream);
+ assert(ctx);
+
+ ustream = stream->ustream;
+
+ /*
+ * First, we are going to check if there is a new subbuffer available
+ * before reading the stream wait_fd.
+ */
+ /* Get the next subbuffer */
+ ret = ustctl_get_next_subbuf(ustream);
+ if (ret) {
+ /* No more data found, flag the stream. */
+ stream->has_data = 0;
+ ret = 0;
+ goto end;
+ }
+
+ ret = ustctl_put_subbuf(ustream);
+ assert(!ret);
+
+ /* This stream still has data. Flag it and wake up the data thread. */
+ stream->has_data = 1;
+
+ if (stream->monitor && !stream->hangup_flush_done && !ctx->has_wakeup) {
+ ssize_t writelen;
+
+ writelen = lttng_pipe_write(ctx->consumer_wakeup_pipe, "!", 1);
+ if (writelen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) {
+ ret = writelen;
+ goto end;
+ }
+
+ /* The wake up pipe has been notified. */
+ ctx->has_wakeup = 1;
+ }
+ ret = 0;
+
+end:
+ return ret;
+}
+
+/*
+ * Read subbuffer from the given stream.
+ *
+ * Stream lock MUST be acquired.
+ *
+ * Return 0 on success else a negative value.
+ */
int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream,
struct lttng_consumer_local_data *ctx)
{
unsigned long len, subbuf_size, padding;
- int err;
+ int err, write_index = 1;
long ret = 0;
- char dummy;
struct ustctl_consumer_stream *ustream;
+ struct ctf_packet_index index;
assert(stream);
assert(stream->ustream);
assert(ctx);
- DBG2("In UST read_subbuffer (wait_fd: %d, name: %s)", stream->wait_fd,
+ DBG("In UST read_subbuffer (wait_fd: %d, name: %s)", stream->wait_fd,
stream->name);
/* Ease our life for what's next. */
ustream = stream->ustream;
- /* We can consume the 1 byte written into the wait_fd by UST */
- if (!stream->hangup_flush_done) {
+ /*
+ * We can consume the 1 byte written into the wait_fd by UST. Don't trigger
+ * error if we cannot read this one byte (read returns 0), or if the error
+ * is EAGAIN or EWOULDBLOCK.
+ *
+ * This is only done when the stream is monitored by a thread, before the
+ * flush is done after a hangup and if the stream is not flagged with data
+ * since there might be nothing to consume in the wait fd but still have
+ * data available flagged by the consumer wake up pipe.
+ */
+ if (stream->monitor && !stream->hangup_flush_done && !stream->has_data) {
+ char dummy;
ssize_t readlen;
- do {
- readlen = read(stream->wait_fd, &dummy, 1);
- } while (readlen == -1 && errno == EINTR);
- if (readlen == -1) {
+ readlen = lttng_read(stream->wait_fd, &dummy, 1);
+ if (readlen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) {
ret = readlen;
goto end;
}
}
+retry:
/* Get the next subbuffer */
err = ustctl_get_next_subbuf(ustream);
if (err != 0) {
+ /*
+ * Populate metadata info if the existing info has
+ * already been read.
+ */
+ if (stream->metadata_flag) {
+ ret = commit_one_metadata_packet(stream);
+ if (ret <= 0) {
+ goto end;
+ }
+ ustctl_flush_buffer(stream->ustream, 1);
+ goto retry;
+ }
+
ret = err; /* ustctl_get_next_subbuf returns negative, caller expect positive. */
/*
* This is a debug message even for single-threaded consumer,
goto end;
}
assert(stream->chan->output == CONSUMER_CHANNEL_MMAP);
+
+ if (!stream->metadata_flag) {
+ index.offset = htobe64(stream->out_fd_offset);
+ ret = get_index_values(&index, ustream);
+ if (ret < 0) {
+ goto end;
+ }
+ } else {
+ write_index = 0;
+ }
+
/* Get the full padded subbuffer size */
err = ustctl_get_padded_subbuf_size(ustream, &len);
assert(err == 0);
padding = len - subbuf_size;
/* write the subbuffer to the tracefile */
- ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, padding);
+ ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, padding, &index);
/*
* The mmap operation should write subbuf_size amount of data when network
* streaming or the full padding (len) size when we are _not_ streaming.
DBG("Error writing to tracefile "
"(ret: %ld != len: %lu != subbuf_size: %lu)",
ret, len, subbuf_size);
+ write_index = 0;
}
err = ustctl_put_next_subbuf(ustream);
assert(err == 0);
+ /*
+ * This will consumer the byte on the wait_fd if and only if there is not
+ * next subbuffer to be acquired.
+ */
+ if (!stream->metadata_flag) {
+ ret = notify_if_more_data(stream, ctx);
+ if (ret < 0) {
+ goto end;
+ }
+ }
+
+ /* Write index if needed. */
+ if (!write_index) {
+ goto end;
+ }
+
+ if (stream->chan->live_timer_interval && !stream->metadata_flag) {
+ /*
+ * In live, block until all the metadata is sent.
+ */
+ pthread_mutex_lock(&stream->metadata_timer_lock);
+ assert(!stream->missed_metadata_flush);
+ stream->waiting_on_metadata = true;
+ pthread_mutex_unlock(&stream->metadata_timer_lock);
+
+ err = consumer_stream_sync_metadata(ctx, stream->session_id);
+
+ pthread_mutex_lock(&stream->metadata_timer_lock);
+ stream->waiting_on_metadata = false;
+ if (stream->missed_metadata_flush) {
+ stream->missed_metadata_flush = false;
+ pthread_mutex_unlock(&stream->metadata_timer_lock);
+ (void) consumer_flush_ust_index(stream);
+ } else {
+ pthread_mutex_unlock(&stream->metadata_timer_lock);
+ }
+
+ if (err < 0) {
+ goto end;
+ }
+ }
+
+ assert(!stream->metadata_flag);
+ err = consumer_stream_write_index(stream, &index);
+ if (err < 0) {
+ goto end;
+ }
+
end:
return ret;
}
{
int ret;
+ assert(stream);
+
/* Don't create anything if this is set for streaming. */
- if (stream->net_seq_idx == (uint64_t) -1ULL) {
+ if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) {
ret = utils_create_stream_file(stream->chan->pathname, stream->name,
stream->chan->tracefile_size, stream->tracefile_count_current,
- stream->uid, stream->gid);
+ stream->uid, stream->gid, NULL);
if (ret < 0) {
goto error;
}
stream->out_fd = ret;
stream->tracefile_size_current = 0;
+
+ if (!stream->metadata_flag) {
+ ret = index_create_file(stream->chan->pathname,
+ stream->name, stream->uid, stream->gid,
+ stream->chan->tracefile_size,
+ stream->tracefile_count_current);
+ if (ret < 0) {
+ goto error;
+ }
+ stream->index_fd = ret;
+ }
}
ret = 0;
DBG("UST consumer checking data pending");
- ret = ustctl_get_next_subbuf(stream->ustream);
- if (ret == 0) {
- /* There is still data so let's put back this subbuffer. */
- ret = ustctl_put_subbuf(stream->ustream);
- assert(ret == 0);
- ret = 1; /* Data is pending */
+ if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) {
+ ret = 0;
goto end;
}
+ if (stream->chan->type == CONSUMER_CHANNEL_TYPE_METADATA) {
+ uint64_t contiguous, pushed;
+
+ /* Ease our life a bit. */
+ contiguous = stream->chan->metadata_cache->max_offset;
+ pushed = stream->ust_metadata_pushed;
+
+ /*
+ * We can simply check whether all contiguously available data
+ * has been pushed to the ring buffer, since the push operation
+ * is performed within get_next_subbuf(), and because both
+ * get_next_subbuf() and put_next_subbuf() are issued atomically
+ * thanks to the stream lock within
+ * lttng_ustconsumer_read_subbuffer(). This basically means that
+ * whetnever ust_metadata_pushed is incremented, the associated
+ * metadata has been consumed from the metadata stream.
+ */
+ DBG("UST consumer metadata pending check: contiguous %" PRIu64 " vs pushed %" PRIu64,
+ contiguous, pushed);
+ assert(((int64_t) (contiguous - pushed)) >= 0);
+ if ((contiguous != pushed) ||
+ (((int64_t) contiguous - pushed) > 0 || contiguous == 0)) {
+ ret = 1; /* Data is pending */
+ goto end;
+ }
+ } else {
+ ret = ustctl_get_next_subbuf(stream->ustream);
+ if (ret == 0) {
+ /*
+ * There is still data so let's put back this
+ * subbuffer.
+ */
+ ret = ustctl_put_subbuf(stream->ustream);
+ assert(ret == 0);
+ ret = 1; /* Data is pending */
+ goto end;
+ }
+ }
+
/* Data is NOT pending so ready to be read. */
ret = 0;
return ret;
}
+/*
+ * Stop a given metadata channel timer if enabled and close the wait fd which
+ * is the poll pipe of the metadata stream.
+ *
+ * This MUST be called with the metadata channel acquired.
+ */
+void lttng_ustconsumer_close_metadata(struct lttng_consumer_channel *metadata)
+{
+ int ret;
+
+ assert(metadata);
+ assert(metadata->type == CONSUMER_CHANNEL_TYPE_METADATA);
+
+ DBG("Closing metadata channel key %" PRIu64, metadata->key);
+
+ if (metadata->switch_timer_enabled == 1) {
+ consumer_timer_switch_stop(metadata);
+ }
+
+ if (!metadata->metadata_stream) {
+ goto end;
+ }
+
+ /*
+ * Closing write side so the thread monitoring the stream wakes up if any
+ * and clean the metadata stream.
+ */
+ if (metadata->metadata_stream->ust_metadata_poll_pipe[1] >= 0) {
+ ret = close(metadata->metadata_stream->ust_metadata_poll_pipe[1]);
+ if (ret < 0) {
+ PERROR("closing metadata pipe write side");
+ }
+ metadata->metadata_stream->ust_metadata_poll_pipe[1] = -1;
+ }
+
+end:
+ return;
+}
+
/*
* Close every metadata stream wait fd of the metadata hash table. This
* function MUST be used very carefully so not to run into a race between the
* producer so calling this is safe because we are assured that no state change
* can occur in the metadata thread for the streams in the hash table.
*/
-void lttng_ustconsumer_close_metadata(struct lttng_ht *metadata_ht)
+void lttng_ustconsumer_close_all_metadata(struct lttng_ht *metadata_ht)
{
- int ret;
struct lttng_ht_iter iter;
struct lttng_consumer_stream *stream;
rcu_read_lock();
cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream,
node.node) {
- int fd = stream->wait_fd;
- /*
- * Whatever happens here we have to continue to try to close every
- * streams. Let's report at least the error on failure.
- */
- ret = ustctl_stream_close_wakeup_fd(stream->ustream);
- if (ret) {
- ERR("Unable to close metadata stream fd %d ret %d", fd, ret);
- }
- DBG("Metadata wait fd %d closed", fd);
+ health_code_update();
+
+ pthread_mutex_lock(&stream->chan->lock);
+ lttng_ustconsumer_close_metadata(stream->chan);
+ pthread_mutex_unlock(&stream->chan->lock);
+
}
rcu_read_unlock();
}
}
}
+/*
+ * Please refer to consumer-timer.c before adding any lock within this
+ * function or any of its callees. Timers have a very strict locking
+ * semantic with respect to teardown. Failure to respect this semantic
+ * introduces deadlocks.
+ *
+ * DON'T hold the metadata lock when calling this function, else this
+ * can cause deadlock involving consumer awaiting for metadata to be
+ * pushed out due to concurrent interaction with the session daemon.
+ */
int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx,
- struct lttng_consumer_channel *channel)
+ struct lttng_consumer_channel *channel, int timer, int wait)
{
struct lttcomm_metadata_request_msg request;
struct lttcomm_consumer_msg msg;
- enum lttng_error_code ret_code = LTTNG_OK;
+ enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS;
uint64_t len, key, offset;
int ret;
assert(channel);
assert(channel->metadata_cache);
+ memset(&request, 0, sizeof(request));
+
/* send the metadata request to sessiond */
switch (consumer_data.type) {
case LTTNG_CONSUMER64_UST:
}
request.session_id = channel->session_id;
- request.uid = channel->uid;
+ request.session_id_per_pid = channel->session_id_per_pid;
+ /*
+ * Request the application UID here so the metadata of that application can
+ * be sent back. The channel UID corresponds to the user UID of the session
+ * used for the rights on the stream file(s).
+ */
+ request.uid = channel->ust_app_uid;
request.key = channel->key;
- DBG("Sending metadata request to sessiond, session %" PRIu64,
- channel->session_id);
+
+ DBG("Sending metadata request to sessiond, session id %" PRIu64
+ ", per-pid %" PRIu64 ", app UID %u and channek key %" PRIu64,
+ request.session_id, request.session_id_per_pid, request.uid,
+ request.key);
+
+ pthread_mutex_lock(&ctx->metadata_socket_lock);
+
+ health_code_update();
ret = lttcomm_send_unix_sock(ctx->consumer_metadata_socket, &request,
sizeof(request));
goto end;
}
+ health_code_update();
+
/* Receive the metadata from sessiond */
ret = lttcomm_recv_unix_sock(ctx->consumer_metadata_socket, &msg,
sizeof(msg));
goto end;
}
+ health_code_update();
+
if (msg.cmd_type == LTTNG_ERR_UND) {
/* No registry found */
(void) consumer_send_status_msg(ctx->consumer_metadata_socket,
DBG("No new metadata to receive for key %" PRIu64, key);
}
+ health_code_update();
+
/* Tell session daemon we are ready to receive the metadata. */
ret = consumer_send_status_msg(ctx->consumer_metadata_socket,
- LTTNG_OK);
+ LTTCOMM_CONSUMERD_SUCCESS);
if (ret < 0 || len == 0) {
/*
* Somehow, the session daemon is not responding anymore or there is
goto end;
}
- ret_code = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket,
- key, offset, len, channel);
- (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret_code);
+ health_code_update();
+
+ ret = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket,
+ key, offset, len, channel, timer, wait);
+ if (ret >= 0) {
+ /*
+ * Only send the status msg if the sessiond is alive meaning a positive
+ * ret code.
+ */
+ (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret);
+ }
ret = 0;
end:
+ health_code_update();
+
+ pthread_mutex_unlock(&ctx->metadata_socket_lock);
return ret;
}
+
+/*
+ * Return the ustctl call for the get stream id.
+ */
+int lttng_ustconsumer_get_stream_id(struct lttng_consumer_stream *stream,
+ uint64_t *stream_id)
+{
+ assert(stream);
+ assert(stream_id);
+
+ return ustctl_get_stream_id(stream->ustream, stream_id);
+}