#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
+#include <inttypes.h>
#include <unistd.h>
+#include <urcu/list.h>
+#include <signal.h>
#include <common/common.h>
#include <common/sessiond-comm/sessiond-comm.h>
#include <common/relayd/relayd.h>
#include <common/compat/fcntl.h>
+#include <common/consumer-metadata-cache.h>
+#include <common/consumer-timer.h>
#include "ust-consumer.h"
extern volatile int consumer_quit;
/*
- * Wrapper over the mmap() read offset from ust-ctl library. Since this can be
- * compiled out, we isolate it in this library.
+ * Free channel object and all streams associated with it. This MUST be used
+ * only and only if the channel has _NEVER_ been added to the global channel
+ * hash table.
*/
-int lttng_ustctl_get_mmap_read_offset(struct lttng_ust_shm_handle *handle,
- struct lttng_ust_lib_ring_buffer *buf, unsigned long *off)
+static void destroy_channel(struct lttng_consumer_channel *channel)
{
- return ustctl_get_mmap_read_offset(handle, buf, off);
-};
+ struct lttng_consumer_stream *stream, *stmp;
+
+ assert(channel);
+
+ DBG("UST consumer cleaning stream list");
+
+ cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head,
+ send_node) {
+ cds_list_del(&stream->send_node);
+ ustctl_destroy_stream(stream->ustream);
+ free(stream);
+ }
+
+ /*
+ * If a channel is available meaning that was created before the streams
+ * were, delete it.
+ */
+ if (channel->uchan) {
+ lttng_ustconsumer_del_channel(channel);
+ }
+ free(channel);
+}
/*
- * Take a snapshot for a specific fd
+ * Add channel to internal consumer state.
*
- * Returns 0 on success, < 0 on error
+ * Returns 0 on success or else a negative value.
*/
-int lttng_ustconsumer_take_snapshot(struct lttng_consumer_local_data *ctx,
- struct lttng_consumer_stream *stream)
+static int add_channel(struct lttng_consumer_channel *channel,
+ struct lttng_consumer_local_data *ctx)
{
int ret = 0;
- ret = ustctl_snapshot(stream->chan->handle, stream->buf);
- if (ret != 0) {
- errno = -ret;
- PERROR("Getting sub-buffer snapshot.");
+ assert(channel);
+ assert(ctx);
+
+ if (ctx->on_recv_channel != NULL) {
+ ret = ctx->on_recv_channel(channel);
+ if (ret == 0) {
+ ret = consumer_add_channel(channel, ctx);
+ } else if (ret < 0) {
+ /* Most likely an ENOMEM. */
+ lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR);
+ goto error;
+ }
+ } else {
+ ret = consumer_add_channel(channel, ctx);
}
+ DBG("UST consumer channel added (key: %" PRIu64 ")", channel->key);
+
+error:
return ret;
}
/*
- * Get the produced position
+ * Allocate and return a consumer channel object.
+ */
+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)
+{
+ assert(pathname);
+ assert(name);
+
+ return consumer_allocate_channel(key, session_id, pathname, name, uid, gid,
+ relayd_id, output);
+}
+
+/*
+ * Allocate and return a consumer stream object. If _alloc_ret is not NULL, the
+ * error value if applicable is set in it else it is kept untouched.
*
- * Returns 0 on success, < 0 on error
+ * Return NULL on error else the newly allocated stream object.
*/
-int lttng_ustconsumer_get_produced_snapshot(
- struct lttng_consumer_local_data *ctx,
- struct lttng_consumer_stream *stream,
- unsigned long *pos)
+static struct lttng_consumer_stream *allocate_stream(int cpu, int key,
+ struct lttng_consumer_channel *channel,
+ struct lttng_consumer_local_data *ctx, int *_alloc_ret)
+{
+ int alloc_ret;
+ struct lttng_consumer_stream *stream = NULL;
+
+ assert(channel);
+ assert(ctx);
+
+ stream = consumer_allocate_stream(channel->key,
+ key,
+ LTTNG_CONSUMER_ACTIVE_STREAM,
+ channel->name,
+ channel->uid,
+ channel->gid,
+ channel->relayd_id,
+ channel->session_id,
+ cpu,
+ &alloc_ret,
+ channel->type);
+ if (stream == NULL) {
+ switch (alloc_ret) {
+ case -ENOENT:
+ /*
+ * We could not find the channel. Can happen if cpu hotplug
+ * happens while tearing down.
+ */
+ DBG3("Could not find channel");
+ break;
+ case -ENOMEM:
+ case -EINVAL:
+ default:
+ lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR);
+ break;
+ }
+ goto error;
+ }
+
+ stream->chan = channel;
+
+error:
+ if (_alloc_ret) {
+ *_alloc_ret = alloc_ret;
+ }
+ return stream;
+}
+
+/*
+ * Send the given stream pointer to the corresponding thread.
+ *
+ * Returns 0 on success else a negative value.
+ */
+static int send_stream_to_thread(struct lttng_consumer_stream *stream,
+ struct lttng_consumer_local_data *ctx)
+{
+ int ret, stream_pipe;
+
+ /* Get the right pipe where the stream will be sent. */
+ if (stream->metadata_flag) {
+ stream_pipe = ctx->consumer_metadata_pipe[1];
+ } else {
+ stream_pipe = ctx->consumer_data_pipe[1];
+ }
+
+ do {
+ ret = write(stream_pipe, &stream, sizeof(stream));
+ } while (ret < 0 && errno == EINTR);
+ if (ret < 0) {
+ PERROR("Consumer write %s stream to pipe %d",
+ stream->metadata_flag ? "metadata" : "data", 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);
+ pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
+ if (ret < 0) {
+ goto error;
+ }
+ } 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;
+}
+
+/*
+ * Create streams for the given channel using liblttng-ust-ctl.
+ *
+ * Return 0 on success else a negative value.
+ */
+static int create_ust_streams(struct lttng_consumer_channel *channel,
+ struct lttng_consumer_local_data *ctx)
+{
+ int ret, cpu = 0;
+ struct ustctl_consumer_stream *ustream;
+ struct lttng_consumer_stream *stream;
+
+ assert(channel);
+ assert(ctx);
+
+ /*
+ * While a stream is available from ustctl. When NULL is returned, we've
+ * reached the end of the possible stream for the channel.
+ */
+ while ((ustream = ustctl_create_stream(channel->uchan, cpu))) {
+ int wait_fd;
+
+ wait_fd = ustctl_stream_get_wait_fd(ustream);
+
+ /* Allocate consumer stream object. */
+ stream = allocate_stream(cpu, wait_fd, channel, ctx, &ret);
+ if (!stream) {
+ goto error_alloc;
+ }
+ stream->ustream = ustream;
+ /*
+ * Store it so we can save multiple function calls afterwards since
+ * this value is used heavily in the stream threads. This is UST
+ * specific so this is why it's done after allocation.
+ */
+ stream->wait_fd = wait_fd;
+
+ /*
+ * Order is important this is why a list is used. On error, the caller
+ * should clean this list.
+ */
+ cds_list_add_tail(&stream->send_node, &channel->streams.head);
+
+ ret = ustctl_get_max_subbuf_size(stream->ustream,
+ &stream->max_sb_size);
+ if (ret < 0) {
+ ERR("ustctl_get_max_subbuf_size failed for stream %s",
+ stream->name);
+ goto error;
+ }
+
+ /* Do actions once stream has been received. */
+ if (ctx->on_recv_stream) {
+ ret = ctx->on_recv_stream(stream);
+ if (ret < 0) {
+ goto error;
+ }
+ }
+
+ DBG("UST consumer add stream %s (key: %" PRIu64 ") with relayd id %" PRIu64,
+ stream->name, stream->key, stream->relayd_stream_id);
+
+ /* Set next CPU stream. */
+ channel->streams.count = ++cpu;
+
+ /* Keep stream reference when creating metadata. */
+ if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) {
+ channel->metadata_stream = stream;
+ }
+ }
+
+ return 0;
+
+error:
+error_alloc:
+ return ret;
+}
+
+/*
+ * Create an UST channel with the given attributes and send it to the session
+ * daemon using the ust ctl API.
+ *
+ * Return 0 on success or else a negative value.
+ */
+static int create_ust_channel(struct ustctl_consumer_channel_attr *attr,
+ struct ustctl_consumer_channel **chanp)
{
int ret;
+ struct ustctl_consumer_channel *channel;
+
+ assert(attr);
+ assert(chanp);
- ret = ustctl_snapshot_get_produced(stream->chan->handle,
- stream->buf, pos);
- if (ret != 0) {
- errno = -ret;
- PERROR("kernctl_snapshot_get_produced");
+ DBG3("Creating channel to ustctl with attr: [overwrite: %d, "
+ "subbuf_size: %" PRIu64 ", num_subbuf: %" PRIu64 ", "
+ "switch_timer_interval: %u, read_timer_interval: %u, "
+ "output: %d, type: %d", attr->overwrite, attr->subbuf_size,
+ attr->num_subbuf, attr->switch_timer_interval,
+ attr->read_timer_interval, attr->output, attr->type);
+
+ channel = ustctl_create_channel(attr);
+ if (!channel) {
+ ret = -1;
+ goto error_create;
}
+ *chanp = channel;
+
+ return 0;
+
+error_create:
return ret;
}
+/*
+ * Send a single given stream to the session daemon using the sock.
+ *
+ * Return 0 on success else a negative value.
+ */
+static int send_sessiond_stream(int sock, struct lttng_consumer_stream *stream)
+{
+ int ret;
+
+ assert(stream);
+ assert(sock >= 0);
+
+ DBG2("UST consumer sending stream %" PRIu64 " to sessiond", stream->key);
+
+ /* Send stream to session daemon. */
+ ret = ustctl_send_stream_to_sessiond(sock, stream->ustream);
+ if (ret < 0) {
+ goto error;
+ }
+
+error:
+ return ret;
+}
+
+/*
+ * Send channel to sessiond.
+ *
+ * Return 0 on success or else a negative value.
+ */
+static int send_sessiond_channel(int sock,
+ struct lttng_consumer_channel *channel,
+ struct lttng_consumer_local_data *ctx, int *relayd_error)
+{
+ int ret;
+ struct lttng_consumer_stream *stream;
+
+ assert(channel);
+ assert(ctx);
+ assert(sock >= 0);
+
+ DBG("UST consumer sending channel %s to sessiond", channel->name);
+
+ /* Send channel to sessiond. */
+ ret = ustctl_send_channel_to_sessiond(sock, channel->uchan);
+ if (ret < 0) {
+ goto error;
+ }
+
+ ret = ustctl_channel_close_wakeup_fd(channel->uchan);
+ if (ret < 0) {
+ goto error;
+ }
+
+ /* 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;
+ }
+
+ /* Send stream to session daemon. */
+ ret = send_sessiond_stream(sock, stream);
+ if (ret < 0) {
+ goto error;
+ }
+ }
+
+ /* Tell sessiond there is no more stream. */
+ ret = ustctl_send_stream_to_sessiond(sock, NULL);
+ if (ret < 0) {
+ goto error;
+ }
+
+ DBG("UST consumer NULL stream sent to sessiond");
+
+ return 0;
+
+error:
+ return ret;
+}
+
+/*
+ * Creates a channel and streams and add the channel it to the channel internal
+ * state. The created stream must ONLY be sent once the GET_CHANNEL command is
+ * received.
+ *
+ * Return 0 on success or else, a negative value is returned and the channel
+ * MUST be destroyed by consumer_del_channel().
+ */
+static int ask_channel(struct lttng_consumer_local_data *ctx, int sock,
+ struct lttng_consumer_channel *channel,
+ struct ustctl_consumer_channel_attr *attr)
+{
+ int ret;
+
+ assert(ctx);
+ assert(channel);
+ assert(attr);
+
+ /*
+ * This value is still used by the kernel consumer since for the kernel,
+ * the stream ownership is not IN the consumer so we need to have the
+ * number of left stream that needs to be initialized so we can know when
+ * to delete the channel (see consumer.c).
+ *
+ * As for the user space tracer now, the consumer creates and sends the
+ * stream to the session daemon which only sends them to the application
+ * once every stream of a channel is received making this value useless
+ * because we they will be added to the poll thread before the application
+ * receives them. This ensures that a stream can not hang up during
+ * initilization of a channel.
+ */
+ channel->nb_init_stream_left = 0;
+
+ /* The reply msg status is handled in the following call. */
+ ret = create_ust_channel(attr, &channel->uchan);
+ if (ret < 0) {
+ goto error;
+ }
+
+ channel->wait_fd = ustctl_channel_get_wait_fd(channel->uchan);
+
+ if (ret < 0) {
+ goto error;
+ }
+
+ /* Open all streams for this channel. */
+ ret = create_ust_streams(channel, ctx);
+ if (ret < 0) {
+ goto error;
+ }
+
+error:
+ return ret;
+}
+
+/*
+ * Send all stream of a channel to the right thread handling it.
+ *
+ * On error, return a negative value else 0 on success.
+ */
+static int send_streams_to_thread(struct lttng_consumer_channel *channel,
+ struct lttng_consumer_local_data *ctx)
+{
+ int ret = 0;
+ struct lttng_consumer_stream *stream, *stmp;
+
+ assert(channel);
+ assert(ctx);
+
+ /* Send streams to the corresponding thread. */
+ cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head,
+ send_node) {
+ /* 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.
+ */
+ 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 %ld", ret, len);
+ goto error;
+ }
+
+ ustctl_flush_buffer(metadata->metadata_stream->ustream, 1);
+
+error:
+ return ret;
+}
+
+/*
+ * Flush channel's streams using the given key to retrieve the channel.
+ *
+ * Return 0 on success else an LTTng error code.
+ */
+static int flush_channel(uint64_t chan_key)
+{
+ int ret = 0;
+ struct lttng_consumer_channel *channel;
+ struct lttng_consumer_stream *stream;
+ struct lttng_ht *ht;
+ struct lttng_ht_iter iter;
+
+ DBG("UST consumer flush channel key %lu", chan_key);
+
+ channel = consumer_find_channel(chan_key);
+ if (!channel) {
+ ERR("UST consumer flush channel %lu not found", chan_key);
+ ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
+ goto error;
+ }
+
+ ht = consumer_data.stream_per_chan_id_ht;
+
+ /* For each stream of the channel id, flush it. */
+ rcu_read_lock();
+ 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);
+ }
+ rcu_read_unlock();
+
+error:
+ return ret;
+}
+
+/*
+ * Close metadata stream wakeup_fd using the given key to retrieve the channel.
+ *
+ * Return 0 on success else an LTTng error code.
+ */
+static int close_metadata(uint64_t chan_key)
+{
+ int ret;
+ struct lttng_consumer_channel *channel;
+
+ DBG("UST consumer close metadata key %lu", chan_key);
+
+ channel = consumer_find_channel(chan_key);
+ if (!channel) {
+ ERR("UST consumer close metadata %lu not found", chan_key);
+ ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
+ goto error;
+ }
+
+ 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;
+ }
+ if (channel->switch_timer_enabled == 1) {
+ DBG("Deleting timer on metadata channel");
+ consumer_timer_switch_stop(channel);
+ }
+ consumer_metadata_cache_destroy(channel);
+
+error:
+ return ret;
+}
+
+/*
+ * RCU read side lock MUST be acquired before calling this function.
+ *
+ * Return 0 on success else an LTTng error code.
+ */
+static int setup_metadata(struct lttng_consumer_local_data *ctx, uint64_t key)
+{
+ int ret;
+ struct lttng_consumer_channel *metadata;
+
+ DBG("UST consumer setup metadata key %lu", key);
+
+ metadata = consumer_find_channel(key);
+ if (!metadata) {
+ ERR("UST consumer push metadata %" PRIu64 " not found", key);
+ ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
+ goto error;
+ }
+
+ /*
+ * Send metadata stream to relayd if one available. Availability is
+ * known if the stream is still in the list of the channel.
+ */
+ if (cds_list_empty(&metadata->streams.head)) {
+ ERR("Metadata channel key %" PRIu64 ", no stream available.", key);
+ ret = LTTCOMM_CONSUMERD_ERROR_METADATA;
+ goto error;
+ }
+
+ /* 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;
+ }
+
+ ret = send_streams_to_thread(metadata, ctx);
+ if (ret < 0) {
+ /*
+ * If we are unable to send the stream to the thread, there is
+ * a big problem so just stop everything.
+ */
+ ret = LTTCOMM_CONSUMERD_FATAL;
+ goto error;
+ }
+ /* List MUST be empty after or else it could be reused. */
+ assert(cds_list_empty(&metadata->streams.head));
+
+ ret = 0;
+
+error:
+ return ret;
+}
+
+/*
+ * Receive the metadata updates from the sessiond.
+ */
+int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset,
+ uint64_t len, struct lttng_consumer_channel *channel)
+{
+ int ret, ret_code = LTTNG_OK;
+ char *metadata_str;
+
+ DBG("UST consumer push metadata key %lu of len %lu", key, len);
+
+ metadata_str = zmalloc(len * sizeof(char));
+ if (!metadata_str) {
+ PERROR("zmalloc metadata string");
+ ret_code = LTTCOMM_CONSUMERD_ENOMEM;
+ goto end;
+ }
+
+ /* 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;
+ }
+
+ 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;
+ }
+ 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);
+ }
+
+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 lttng_error_code ret_code = LTTNG_OK;
struct lttcomm_consumer_msg msg;
+ struct lttng_consumer_channel *channel = NULL;
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, CONSUMERD_ERROR_RECV_FD);
+ 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;
}
- /* relayd need RCU read-side lock */
+ /* relayd needs RCU read-side lock */
rcu_read_lock();
switch (msg.cmd_type) {
case LTTNG_CONSUMER_ADD_RELAYD_SOCKET:
{
- int fd;
+ /* 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;
+ }
+ case LTTNG_CONSUMER_DESTROY_RELAYD:
+ {
+ uint64_t index = msg.u.destroy_relayd.net_seq_idx;
struct consumer_relayd_sock_pair *relayd;
- DBG("UST Consumer adding relayd socket");
+ DBG("UST consumer destroying relayd %" PRIu64, index);
/* Get relayd reference if exists. */
- relayd = consumer_find_relayd(msg.u.relayd_sock.net_index);
+ relayd = consumer_find_relayd(index);
if (relayd == NULL) {
- /* Not found. Allocate one. */
- relayd = consumer_allocate_relayd_sock_pair(
- msg.u.relayd_sock.net_index);
- if (relayd == NULL) {
- lttng_consumer_send_error(ctx, CONSUMERD_OUTFD_ERROR);
- goto end_nosignal;
- }
+ DBG("Unable to find relayd %" PRIu64, index);
+ ret_code = LTTNG_ERR_NO_CONSUMER;
}
- /* Poll on consumer socket. */
- if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) {
- return -EINTR;
+ /*
+ * 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);
}
- /* Get relayd socket from session daemon */
- ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1);
- if (ret != sizeof(fd)) {
- lttng_consumer_send_error(ctx, CONSUMERD_ERROR_RECV_FD);
- goto end_nosignal;
+ goto end_msg_sessiond;
+ }
+ case LTTNG_CONSUMER_UPDATE_STREAM:
+ {
+ rcu_read_unlock();
+ return -ENOSYS;
+ }
+ case LTTNG_CONSUMER_DATA_PENDING:
+ {
+ int ret, is_data_pending;
+ uint64_t id = msg.u.data_pending.session_id;
+
+ DBG("UST consumer data pending command for id %" PRIu64, id);
+
+ is_data_pending = consumer_data_pending(id);
+
+ /* Send back returned value to session daemon */
+ ret = lttcomm_send_unix_sock(sock, &is_data_pending,
+ sizeof(is_data_pending));
+ if (ret < 0) {
+ DBG("Error when sending the data pending ret code: %d", ret);
}
- /* Copy socket information and received FD */
- switch (msg.u.relayd_sock.type) {
- case LTTNG_STREAM_CONTROL:
- /* Copy received lttcomm socket */
- lttcomm_copy_sock(&relayd->control_sock, &msg.u.relayd_sock.sock);
- ret = lttcomm_create_sock(&relayd->control_sock);
- if (ret < 0) {
- goto end_nosignal;
- }
+ /*
+ * No need to send back a status message since the data pending
+ * returned value is the response.
+ */
+ break;
+ }
+ case LTTNG_CONSUMER_ASK_CHANNEL_CREATION:
+ {
+ int ret;
+ struct ustctl_consumer_channel_attr attr;
- /* Close the created socket fd which is useless */
- close(relayd->control_sock.fd);
+ /* Create a plain object and reserve a channel key. */
+ channel = allocate_channel(msg.u.ask_channel.session_id,
+ msg.u.ask_channel.pathname, msg.u.ask_channel.name,
+ msg.u.ask_channel.uid, msg.u.ask_channel.gid,
+ msg.u.ask_channel.relayd_id, msg.u.ask_channel.key,
+ (enum lttng_event_output) msg.u.ask_channel.output);
+ if (!channel) {
+ goto end_channel_error;
+ }
- /* Assign new file descriptor */
- relayd->control_sock.fd = fd;
- break;
- case LTTNG_STREAM_DATA:
- /* Copy received lttcomm socket */
- lttcomm_copy_sock(&relayd->data_sock, &msg.u.relayd_sock.sock);
- ret = lttcomm_create_sock(&relayd->data_sock);
- if (ret < 0) {
- goto end_nosignal;
- }
+ /* 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.overwrite = msg.u.ask_channel.overwrite;
+ attr.switch_timer_interval = msg.u.ask_channel.switch_timer_interval;
+ attr.read_timer_interval = msg.u.ask_channel.read_timer_interval;
+ attr.chan_id = msg.u.ask_channel.chan_id;
+ memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid));
- /* Close the created socket fd which is useless */
- close(relayd->data_sock.fd);
+ /* Translate the event output type to UST. */
+ switch (channel->output) {
+ case LTTNG_EVENT_SPLICE:
+ /* Splice not supported so fallback on mmap(). */
+ case LTTNG_EVENT_MMAP:
+ default:
+ attr.output = CONSUMER_CHANNEL_MMAP;
+ break;
+ };
- /* Assign new file descriptor */
- relayd->data_sock.fd = fd;
+ /* Translate and save channel type. */
+ switch (msg.u.ask_channel.type) {
+ case LTTNG_UST_CHAN_PER_CPU:
+ channel->type = CONSUMER_CHANNEL_TYPE_DATA;
+ attr.type = LTTNG_UST_CHAN_PER_CPU;
+ break;
+ case LTTNG_UST_CHAN_METADATA:
+ channel->type = CONSUMER_CHANNEL_TYPE_METADATA;
+ attr.type = LTTNG_UST_CHAN_METADATA;
break;
default:
- ERR("Unknown relayd socket type");
- goto end_nosignal;
+ assert(0);
+ goto error_fatal;
+ };
+
+ ret = ask_channel(ctx, sock, channel, &attr);
+ if (ret < 0) {
+ goto end_channel_error;
+ }
+
+ /*
+ * Add the channel to the internal state AFTER all streams were created
+ * and successfully sent to session daemon. This way, all streams must
+ * be ready before this channel is visible to the threads.
+ */
+ ret = add_channel(channel, ctx);
+ if (ret < 0) {
+ goto end_channel_error;
}
- DBG("Consumer %s socket created successfully with net idx %d (fd: %d)",
- msg.u.relayd_sock.type == LTTNG_STREAM_CONTROL ? "control" : "data",
- relayd->net_seq_idx, fd);
/*
- * Add relayd socket pair to consumer data hashtable. If object already
- * exists or on error, the function gracefully returns.
+ * Channel and streams are now created. Inform the session daemon that
+ * everything went well and should wait to receive the channel and
+ * streams with ustctl API.
*/
- consumer_add_relayd(relayd);
+ 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.
+ */
+ goto end_nosignal;
+ }
- goto end_nosignal;
+ if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) {
+ ret = consumer_metadata_cache_allocate(channel);
+ if (ret < 0) {
+ ERR("Allocating metadata cache");
+ goto end_channel_error;
+ }
+ consumer_timer_switch_start(channel, attr.switch_timer_interval);
+ attr.switch_timer_interval = 0;
+ }
+
+ break;
}
- case LTTNG_CONSUMER_ADD_CHANNEL:
+ case LTTNG_CONSUMER_GET_CHANNEL:
{
- struct lttng_consumer_channel *new_channel;
- int fds[1];
- size_t nb_fd = 1;
+ int ret, relayd_err = 0;
+ uint64_t key = msg.u.get_channel.key;
+ struct lttng_consumer_channel *channel;
- DBG("UST Consumer adding channel");
-
- /* block */
- if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) {
- return -EINTR;
+ channel = consumer_find_channel(key);
+ if (!channel) {
+ ERR("UST consumer get channel key %lu not found", key);
+ ret_code = LTTNG_ERR_UST_CHAN_NOT_FOUND;
+ goto end_msg_sessiond;
}
- ret = lttcomm_recv_fds_unix_sock(sock, fds, nb_fd);
- if (ret != sizeof(fds)) {
- lttng_consumer_send_error(ctx, CONSUMERD_ERROR_RECV_FD);
- return ret;
- }
-
- DBG("consumer_add_channel %d", msg.u.channel.channel_key);
- new_channel = consumer_allocate_channel(msg.u.channel.channel_key,
- fds[0], -1,
- msg.u.channel.mmap_len,
- msg.u.channel.max_sb_size);
- if (new_channel == NULL) {
- lttng_consumer_send_error(ctx, CONSUMERD_OUTFD_ERROR);
+ /* 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;
}
- if (ctx->on_recv_channel != NULL) {
- ret = ctx->on_recv_channel(new_channel);
- if (ret == 0) {
- consumer_add_channel(new_channel);
- } else if (ret < 0) {
- goto end_nosignal;
+
+ /* Send everything to sessiond. */
+ ret = send_sessiond_channel(sock, channel, ctx, &relayd_err);
+ if (ret < 0) {
+ if (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.
+ */
+ ret_code = LTTNG_ERR_RELAYD_CONNECT_FAIL;
+ goto end_msg_sessiond;
}
- } else {
- consumer_add_channel(new_channel);
+ /*
+ * The communicaton was broken hence there is a bad state between
+ * the consumer and sessiond so stop everything.
+ */
+ goto error_fatal;
}
- goto end_nosignal;
+
+ ret = send_streams_to_thread(channel, ctx);
+ if (ret < 0) {
+ /*
+ * If we are unable to send the stream to the thread, there is
+ * a big problem so just stop everything.
+ */
+ goto error_fatal;
+ }
+ /* 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_ADD_STREAM:
+ case LTTNG_CONSUMER_DESTROY_CHANNEL:
{
- struct lttng_consumer_stream *new_stream;
- int fds[2];
- size_t nb_fd = 2;
- struct consumer_relayd_sock_pair *relayd = NULL;
-
- DBG("UST Consumer adding stream");
+ uint64_t key = msg.u.destroy_channel.key;
+ struct lttng_consumer_channel *channel;
- /* block */
- if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) {
- return -EINTR;
- }
- ret = lttcomm_recv_fds_unix_sock(sock, fds, nb_fd);
- if (ret != sizeof(fds)) {
- lttng_consumer_send_error(ctx, CONSUMERD_ERROR_RECV_FD);
- return ret;
- }
-
- DBG("consumer_add_stream chan %d stream %d",
- msg.u.stream.channel_key,
- msg.u.stream.stream_key);
-
- assert(msg.u.stream.output == LTTNG_EVENT_MMAP);
- new_stream = consumer_allocate_stream(msg.u.stream.channel_key,
- msg.u.stream.stream_key,
- fds[0], fds[1],
- msg.u.stream.state,
- msg.u.stream.mmap_len,
- msg.u.stream.output,
- msg.u.stream.path_name,
- msg.u.stream.uid,
- msg.u.stream.gid,
- msg.u.stream.net_index,
- msg.u.stream.metadata_flag);
- if (new_stream == NULL) {
- lttng_consumer_send_error(ctx, CONSUMERD_OUTFD_ERROR);
- goto end;
+ channel = consumer_find_channel(key);
+ if (!channel) {
+ ERR("UST consumer get channel key %lu not found", key);
+ ret_code = LTTNG_ERR_UST_CHAN_NOT_FOUND;
+ goto end_msg_sessiond;
}
- /* The stream is not metadata. Get relayd reference if exists. */
- relayd = consumer_find_relayd(msg.u.stream.net_index);
- if (relayd != NULL) {
- pthread_mutex_lock(&relayd->ctrl_sock_mutex);
- /* Add stream on the relayd */
- ret = relayd_add_stream(&relayd->control_sock,
- msg.u.stream.name, msg.u.stream.path_name,
- &new_stream->relayd_stream_id);
- pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
- if (ret < 0) {
- goto end;
- }
- } else if (msg.u.stream.net_index != -1) {
- ERR("Network sequence index %d unknown. Not adding stream.",
- msg.u.stream.net_index);
- free(new_stream);
- goto end;
+ destroy_channel(channel);
+
+ goto end_msg_sessiond;
+ }
+ case LTTNG_CONSUMER_CLOSE_METADATA:
+ {
+ int ret;
+
+ ret = close_metadata(msg.u.close_metadata.key);
+ if (ret != 0) {
+ ret_code = ret;
}
- if (ctx->on_recv_stream != NULL) {
- ret = ctx->on_recv_stream(new_stream);
- if (ret == 0) {
- consumer_add_stream(new_stream);
- } else if (ret < 0) {
- goto end;
- }
- } else {
- consumer_add_stream(new_stream);
+ goto end_msg_sessiond;
+ }
+ case LTTNG_CONSUMER_FLUSH_CHANNEL:
+ {
+ int ret;
+
+ ret = flush_channel(msg.u.flush_channel.key);
+ if (ret != 0) {
+ ret_code = ret;
}
- DBG("UST consumer_add_stream %s (%d,%d) with relayd id %lu",
- msg.u.stream.path_name, fds[0], fds[1],
- new_stream->relayd_stream_id);
- break;
+ goto end_msg_sessiond;
}
- case LTTNG_CONSUMER_DESTROY_RELAYD:
+ case LTTNG_CONSUMER_PUSH_METADATA:
{
- struct consumer_relayd_sock_pair *relayd;
+ int ret;
+ uint64_t len = msg.u.push_metadata.len;
+ uint64_t key = msg.u.push_metadata.key;
+ uint64_t offset = msg.u.push_metadata.target_offset;
+ struct lttng_consumer_channel *channel;
- DBG("UST consumer destroying relayd %zu",
- msg.u.destroy_relayd.net_seq_idx);
+ DBG("UST consumer push metadata key %lu of len %lu", key, len);
- /* Get relayd reference if exists. */
- relayd = consumer_find_relayd(msg.u.destroy_relayd.net_seq_idx);
- if (relayd == NULL) {
- ERR("Unable to find relayd %zu",
- msg.u.destroy_relayd.net_seq_idx);
+ channel = consumer_find_channel(key);
+ if (!channel) {
+ ERR("UST consumer push metadata %lu not found", key);
+ ret_code = LTTNG_ERR_UST_CHAN_NOT_FOUND;
}
- /* Set destroy flag for this object */
- uatomic_set(&relayd->destroy_flag, 1);
+ /* Tell session daemon we are ready to receive the metadata. */
+ ret = consumer_send_status_msg(sock, LTTNG_OK);
+ if (ret < 0) {
+ /* Somehow, the session daemon is not responding anymore. */
+ goto error_fatal;
+ }
- /* Destroy the relayd if refcount is 0 else set the destroy flag. */
- if (uatomic_read(&relayd->refcount) == 0) {
- consumer_destroy_relayd(relayd);
+ /* Wait for more data. */
+ if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) {
+ goto end_nosignal;
+ }
+
+ ret = lttng_ustconsumer_recv_metadata(sock, key, offset,
+ len, channel);
+ if (ret < 0) {
+ /* error receiving from sessiond */
+ goto end_nosignal;
+ } else {
+ ret_code = ret;
+ goto end_msg_sessiond;
}
- break;
}
- case LTTNG_CONSUMER_UPDATE_STREAM:
+ case LTTNG_CONSUMER_SETUP_METADATA:
{
- return -ENOSYS;
-#if 0
- if (ctx->on_update_stream != NULL) {
- ret = ctx->on_update_stream(msg.u.stream.stream_key, msg.u.stream.state);
- if (ret == 0) {
- consumer_change_stream_state(msg.u.stream.stream_key, msg.u.stream.state);
- } else if (ret < 0) {
- goto end;
- }
- } else {
- consumer_change_stream_state(msg.u.stream.stream_key,
- msg.u.stream.state);
+ int ret;
+
+ ret = setup_metadata(ctx, msg.u.setup_metadata.key);
+ if (ret) {
+ ret_code = ret;
}
-#endif
- break;
+ goto end_msg_sessiond;
}
default:
break;
}
-end:
+
+end_nosignal:
+ rcu_read_unlock();
+
/*
- * Wake-up the other end by writing a null byte in the pipe
- * (non-blocking). Important note: Because writing into the
- * pipe is non-blocking (and therefore we allow dropping wakeup
- * data, as long as there is wakeup data present in the pipe
- * buffer to wake up the other end), the other end should
- * perform the following sequence for waiting:
- * 1) empty the pipe (reads).
- * 2) perform update operation.
- * 3) wait on the pipe (poll).
+ * Return 1 to indicate success since the 0 value can be a socket
+ * shutdown during the recv() or send() call.
*/
- do {
- ret = write(ctx->consumer_poll_pipe[1], "", 1);
- } while (ret < 0 && errno == EINTR);
-end_nosignal:
+ return 1;
+
+end_msg_sessiond:
+ /*
+ * The returned value here is not useful since either way we'll return 1 to
+ * 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);
rcu_read_unlock();
- return 0;
+ return 1;
+end_channel_error:
+ if (channel) {
+ /*
+ * Free channel here since no one has a reference to it. We don't
+ * free after that because a stream can store this pointer.
+ */
+ destroy_channel(channel);
+ }
+ /* We have to send a status channel message indicating an error. */
+ ret = consumer_send_status_channel(sock, NULL);
+ if (ret < 0) {
+ /* Stop everything if session daemon can not be notified. */
+ goto error_fatal;
+ }
+ rcu_read_unlock();
+ return 1;
+error_fatal:
+ rcu_read_unlock();
+ /* This will issue a consumer stop. */
+ return -1;
}
-int lttng_ustconsumer_allocate_channel(struct lttng_consumer_channel *chan)
+/*
+ * Wrapper over the mmap() read offset from ust-ctl library. Since this can be
+ * compiled out, we isolate it in this library.
+ */
+int lttng_ustctl_get_mmap_read_offset(struct lttng_consumer_stream *stream,
+ unsigned long *off)
{
- struct lttng_ust_object_data obj;
+ assert(stream);
+ assert(stream->ustream);
- obj.handle = -1;
- obj.shm_fd = chan->shm_fd;
- obj.wait_fd = chan->wait_fd;
- obj.memory_map_size = chan->mmap_len;
- chan->handle = ustctl_map_channel(&obj);
- if (!chan->handle) {
- return -ENOMEM;
- }
- chan->wait_fd_is_copy = 1;
- chan->shm_fd = -1;
+ return ustctl_get_mmap_read_offset(stream->ustream, off);
+}
- return 0;
+/*
+ * Wrapper over the mmap() read offset from ust-ctl library. Since this can be
+ * compiled out, we isolate it in this library.
+ */
+void *lttng_ustctl_get_mmap_base(struct lttng_consumer_stream *stream)
+{
+ assert(stream);
+ assert(stream->ustream);
+
+ return ustctl_get_mmap_base(stream->ustream);
}
-void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream)
+/*
+ * Take a snapshot for a specific fd
+ *
+ * Returns 0 on success, < 0 on error
+ */
+int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream)
{
- ustctl_flush_buffer(stream->chan->handle, stream->buf, 0);
- stream->hangup_flush_done = 1;
+ assert(stream);
+ assert(stream->ustream);
+
+ return ustctl_snapshot(stream->ustream);
}
-void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan)
+/*
+ * Get the produced position
+ *
+ * Returns 0 on success, < 0 on error
+ */
+int lttng_ustconsumer_get_produced_snapshot(
+ struct lttng_consumer_stream *stream, unsigned long *pos)
{
- ustctl_unmap_channel(chan->handle);
+ assert(stream);
+ assert(stream->ustream);
+ assert(pos);
+
+ return ustctl_snapshot_get_produced(stream->ustream, pos);
}
-int lttng_ustconsumer_allocate_stream(struct lttng_consumer_stream *stream)
+/*
+ * Called when the stream signal the consumer that it has hang up.
+ */
+void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream)
{
- struct lttng_ust_object_data obj;
- int ret;
+ assert(stream);
+ assert(stream->ustream);
- obj.handle = -1;
- obj.shm_fd = stream->shm_fd;
- obj.wait_fd = stream->wait_fd;
- obj.memory_map_size = stream->mmap_len;
- ret = ustctl_add_stream(stream->chan->handle, &obj);
- if (ret)
- return ret;
- stream->buf = ustctl_open_stream_read(stream->chan->handle, stream->cpu);
- if (!stream->buf)
- return -EBUSY;
- /* ustctl_open_stream_read has closed the shm fd. */
- stream->wait_fd_is_copy = 1;
- stream->shm_fd = -1;
+ ustctl_flush_buffer(stream->ustream, 0);
+ stream->hangup_flush_done = 1;
+}
- stream->mmap_base = ustctl_get_mmap_base(stream->chan->handle, stream->buf);
- if (!stream->mmap_base) {
- return -EINVAL;
- }
+void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan)
+{
+ assert(chan);
+ assert(chan->uchan);
- return 0;
+ ustctl_destroy_channel(chan->uchan);
}
void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream)
{
- ustctl_close_stream_read(stream->chan->handle, stream->buf);
-}
+ assert(stream);
+ assert(stream->ustream);
+ ustctl_destroy_stream(stream->ustream);
+}
int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream,
struct lttng_consumer_local_data *ctx)
{
- unsigned long len;
+ unsigned long len, subbuf_size, padding;
int err;
long ret = 0;
- struct lttng_ust_shm_handle *handle;
- struct lttng_ust_lib_ring_buffer *buf;
char dummy;
- ssize_t readlen;
+ struct ustctl_consumer_stream *ustream;
+
+ assert(stream);
+ assert(stream->ustream);
+ assert(ctx);
- DBG("In read_subbuffer (wait_fd: %d, stream key: %d)",
- stream->wait_fd, stream->key);
+ DBG2("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) {
+ ssize_t readlen;
+
do {
readlen = read(stream->wait_fd, &dummy, 1);
} while (readlen == -1 && errno == EINTR);
}
}
- buf = stream->buf;
- handle = stream->chan->handle;
/* Get the next subbuffer */
- err = ustctl_get_next_subbuf(handle, buf);
+ err = ustctl_get_next_subbuf(ustream);
if (err != 0) {
- ret = -ret; /* ustctl_get_next_subbuf returns negative, caller expect positive. */
+ ret = err; /* ustctl_get_next_subbuf returns negative, caller expect positive. */
/*
* This is a debug message even for single-threaded consumer,
* because poll() have more relaxed criterions than get subbuf,
* would issue wakeups.
*/
DBG("Reserving sub buffer failed (everything is normal, "
- "it is due to concurrency)");
+ "it is due to concurrency) [ret: %d]", err);
goto end;
}
- assert(stream->output == LTTNG_EVENT_MMAP);
- /* read the used subbuffer size */
- err = ustctl_get_padded_subbuf_size(handle, buf, &len);
+ assert(stream->chan->output == CONSUMER_CHANNEL_MMAP);
+ /* Get the full padded subbuffer size */
+ err = ustctl_get_padded_subbuf_size(ustream, &len);
assert(err == 0);
+
+ /* Get subbuffer data size (without padding) */
+ err = ustctl_get_subbuf_size(ustream, &subbuf_size);
+ assert(err == 0);
+
+ /* Make sure we don't get a subbuffer size bigger than the padded */
+ assert(len >= subbuf_size);
+
+ padding = len - subbuf_size;
/* write the subbuffer to the tracefile */
- ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len);
- if (ret != len) {
+ ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, padding);
+ /*
+ * The mmap operation should write subbuf_size amount of data when network
+ * streaming or the full padding (len) size when we are _not_ streaming.
+ */
+ if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) ||
+ (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) {
/*
- * display the error but continue processing to try
- * to release the subbuffer
+ * Display the error but continue processing to try to release the
+ * subbuffer. This is a DBG statement since any unexpected kill or
+ * signal, the application gets unregistered, relayd gets closed or
+ * anything that affects the buffer lifetime will trigger this error.
+ * So, for the sake of the user, don't print this error since it can
+ * happen and it is OK with the code flow.
*/
- ERR("Error writing to tracefile");
+ DBG("Error writing to tracefile "
+ "(ret: %zd != len: %lu != subbuf_size: %lu)",
+ ret, len, subbuf_size);
}
- err = ustctl_put_next_subbuf(handle, buf);
+ err = ustctl_put_next_subbuf(ustream);
assert(err == 0);
+
end:
return ret;
}
+/*
+ * Called when a stream is created.
+ */
int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream)
{
int ret;
+ char full_path[PATH_MAX];
/* Opening the tracefile in write mode */
- if (stream->path_name != NULL && stream->net_seq_idx == -1) {
- ret = run_as_open(stream->path_name,
- O_WRONLY|O_CREAT|O_TRUNC,
- S_IRWXU|S_IRWXG|S_IRWXO,
- stream->uid, stream->gid);
- if (ret < 0) {
- ERR("Opening %s", stream->path_name);
- PERROR("open");
- goto error;
- }
- stream->out_fd = ret;
+ if (stream->net_seq_idx != (uint64_t) -1ULL) {
+ goto end;
+ }
+
+ ret = snprintf(full_path, sizeof(full_path), "%s/%s",
+ stream->chan->pathname, stream->name);
+ if (ret < 0) {
+ PERROR("snprintf on_recv_stream");
+ goto error;
+ }
+
+ ret = run_as_open(full_path, O_WRONLY | O_CREAT | O_TRUNC,
+ S_IRWXU | S_IRWXG | S_IRWXO, stream->uid, stream->gid);
+ if (ret < 0) {
+ PERROR("open stream path %s", full_path);
+ goto error;
}
+ stream->out_fd = ret;
+end:
/* we return 0 to let the library handle the FD internally */
return 0;
error:
return ret;
}
+
+/*
+ * Check if data is still being extracted from the buffers for a specific
+ * stream. Consumer data lock MUST be acquired before calling this function
+ * and the stream lock.
+ *
+ * Return 1 if the traced data are still getting read else 0 meaning that the
+ * data is available for trace viewer reading.
+ */
+int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream)
+{
+ int ret;
+
+ assert(stream);
+ assert(stream->ustream);
+
+ 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 */
+ goto end;
+ }
+
+ /* Data is NOT pending so ready to be read. */
+ ret = 0;
+
+end:
+ return ret;
+}
+
+/*
+ * 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
+ * metadata thread handling streams and this function closing their wait fd.
+ *
+ * For UST, this is used when the session daemon hangs up. Its the metadata
+ * 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)
+{
+ int ret;
+ struct lttng_ht_iter iter;
+ struct lttng_consumer_stream *stream;
+
+ assert(metadata_ht);
+ assert(metadata_ht->ht);
+
+ DBG("UST consumer closing all metadata streams");
+
+ 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);
+ }
+ rcu_read_unlock();
+}
+
+void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream *stream)
+{
+ int ret;
+
+ ret = ustctl_stream_close_wakeup_fd(stream->ustream);
+ if (ret < 0) {
+ ERR("Unable to close wakeup fd");
+ }
+}
+
+int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx,
+ struct lttng_consumer_channel *channel)
+{
+ struct lttcomm_metadata_request_msg request;
+ struct lttcomm_consumer_msg msg;
+ enum lttng_error_code ret_code = LTTNG_OK;
+ uint64_t len, key, offset;
+ int ret;
+
+ assert(channel);
+ assert(channel->metadata_cache);
+
+ /* send the metadata request to sessiond */
+ switch (consumer_data.type) {
+ case LTTNG_CONSUMER64_UST:
+ request.bits_per_long = 64;
+ break;
+ case LTTNG_CONSUMER32_UST:
+ request.bits_per_long = 32;
+ break;
+ default:
+ request.bits_per_long = 0;
+ break;
+ }
+
+ request.session_id = channel->session_id;
+ request.uid = channel->uid;
+ request.key = channel->key;
+ DBG("Sending metadata request to sessiond, session %" PRIu64,
+ channel->session_id);
+
+ ret = lttcomm_send_unix_sock(ctx->consumer_metadata_socket, &request,
+ sizeof(request));
+ if (ret < 0) {
+ ERR("Asking metadata to sessiond");
+ goto end;
+ }
+
+ /* Receive the metadata from sessiond */
+ ret = lttcomm_recv_unix_sock(ctx->consumer_metadata_socket, &msg,
+ sizeof(msg));
+ if (ret != sizeof(msg)) {
+ DBG("Consumer received unexpected message size %d (expects %lu)",
+ 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.
+ */
+ goto end;
+ }
+
+ if (msg.cmd_type == LTTNG_ERR_UND) {
+ /* No registry found */
+ (void) consumer_send_status_msg(ctx->consumer_metadata_socket,
+ ret_code);
+ ret = 0;
+ goto end;
+ } else if (msg.cmd_type != LTTNG_CONSUMER_PUSH_METADATA) {
+ ERR("Unexpected cmd_type received %d", msg.cmd_type);
+ ret = -1;
+ goto end;
+ }
+
+ len = msg.u.push_metadata.len;
+ key = msg.u.push_metadata.key;
+ offset = msg.u.push_metadata.target_offset;
+
+ assert(key == channel->key);
+ if (len == 0) {
+ DBG("No new metadata to receive for key %" PRIu64, key);
+ }
+
+ /* Tell session daemon we are ready to receive the metadata. */
+ ret = consumer_send_status_msg(ctx->consumer_metadata_socket,
+ LTTNG_OK);
+ if (ret < 0 || len == 0) {
+ /*
+ * Somehow, the session daemon is not responding anymore or there is
+ * nothing to receive.
+ */
+ 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);
+ ret = 0;
+
+end:
+ return ret;
+}
projects / lttng-tools.git / blobdiff