#include <common/ust-consumer/ust-consumer.h>
#include "consumer.h"
+#include "consumer-stream.h"
struct lttng_consumer_global_data consumer_data = {
.stream_count = 0,
return stream;
}
-static void steal_stream_key(int key, struct lttng_ht *ht)
+static void steal_stream_key(uint64_t key, struct lttng_ht *ht)
{
struct lttng_consumer_stream *stream;
rcu_read_lock();
stream = find_stream(key, ht);
if (stream) {
- stream->key = -1ULL;
+ stream->key = (uint64_t) -1ULL;
/*
* We don't want the lookup to match, but we still need
* to iterate on this stream when iterating over the hash table. Just
* change the node key.
*/
- stream->node.key = -1ULL;
+ stream->node.key = (uint64_t) -1ULL;
}
rcu_read_unlock();
}
/*
* Destroy and free relayd socket pair object.
- *
- * This function MUST be called with the consumer_data lock acquired.
*/
-static void destroy_relayd(struct consumer_relayd_sock_pair *relayd)
+void consumer_destroy_relayd(struct consumer_relayd_sock_pair *relayd)
{
int ret;
struct lttng_ht_iter iter;
DBG("Consumer delete channel key %" PRIu64, channel->key);
pthread_mutex_lock(&consumer_data.lock);
+ pthread_mutex_lock(&channel->lock);
+
+ /* Delete streams that might have been left in the stream list. */
+ cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head,
+ send_node) {
+ cds_list_del(&stream->send_node);
+ /*
+ * Once a stream is added to this list, the buffers were created so
+ * we have a guarantee that this call will succeed.
+ */
+ consumer_stream_destroy(stream, NULL);
+ }
switch (consumer_data.type) {
case LTTNG_CONSUMER_KERNEL:
break;
case LTTNG_CONSUMER32_UST:
case LTTNG_CONSUMER64_UST:
- /* Delete streams that might have been left in the stream list. */
- cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head,
- send_node) {
- cds_list_del(&stream->send_node);
- lttng_ustconsumer_del_stream(stream);
- free(stream);
- }
lttng_ustconsumer_del_channel(channel);
break;
default:
call_rcu(&channel->node.head, free_channel_rcu);
end:
+ pthread_mutex_unlock(&channel->lock);
pthread_mutex_unlock(&consumer_data.lock);
}
cds_lfht_for_each_entry(consumer_data.relayd_ht->ht, &iter.iter, relayd,
node.node) {
- destroy_relayd(relayd);
+ consumer_destroy_relayd(relayd);
}
rcu_read_unlock();
* It's atomically set without having the stream mutex locked which is fine
* because we handle the write/read race with a pipe wakeup for each thread.
*/
-static void update_endpoint_status_by_netidx(int net_seq_idx,
+static void update_endpoint_status_by_netidx(uint64_t net_seq_idx,
enum consumer_endpoint_status status)
{
struct lttng_ht_iter iter;
struct lttng_consumer_stream *stream;
- DBG("Consumer set delete flag on stream by idx %d", net_seq_idx);
+ DBG("Consumer set delete flag on stream by idx %" PRIu64, net_seq_idx);
rcu_read_lock();
static void cleanup_relayd(struct consumer_relayd_sock_pair *relayd,
struct lttng_consumer_local_data *ctx)
{
- int netidx;
+ uint64_t netidx;
assert(relayd);
* Delete the relayd from the relayd hash table, close the sockets and free
* the object in a RCU call.
*/
- destroy_relayd(relayd);
+ consumer_destroy_relayd(relayd);
/* Set inactive endpoint to all streams */
update_endpoint_status_by_netidx(netidx, CONSUMER_ENDPOINT_INACTIVE);
/* Destroy the relayd if refcount is 0 */
if (uatomic_read(&relayd->refcount) == 0) {
- destroy_relayd(relayd);
+ consumer_destroy_relayd(relayd);
}
}
/*
- * Remove a stream from the global list protected by a mutex. This
- * function is also responsible for freeing its data structures.
+ * Completly destroy stream from every visiable data structure and the given
+ * hash table if one.
+ *
+ * One this call returns, the stream object is not longer usable nor visible.
*/
void consumer_del_stream(struct lttng_consumer_stream *stream,
struct lttng_ht *ht)
{
- int ret;
- struct lttng_ht_iter iter;
- struct lttng_consumer_channel *free_chan = NULL;
- struct consumer_relayd_sock_pair *relayd;
-
- assert(stream);
-
- DBG("Consumer del stream %d", stream->wait_fd);
-
- if (ht == NULL) {
- /* Means the stream was allocated but not successfully added */
- goto free_stream_rcu;
- }
-
- pthread_mutex_lock(&consumer_data.lock);
- pthread_mutex_lock(&stream->lock);
-
- switch (consumer_data.type) {
- case LTTNG_CONSUMER_KERNEL:
- if (stream->mmap_base != NULL) {
- ret = munmap(stream->mmap_base, stream->mmap_len);
- if (ret != 0) {
- PERROR("munmap");
- }
- }
-
- if (stream->wait_fd >= 0) {
- ret = close(stream->wait_fd);
- if (ret) {
- PERROR("close");
- }
- }
- break;
- case LTTNG_CONSUMER32_UST:
- case LTTNG_CONSUMER64_UST:
- lttng_ustconsumer_del_stream(stream);
- break;
- default:
- ERR("Unknown consumer_data type");
- assert(0);
- goto end;
- }
-
- rcu_read_lock();
- iter.iter.node = &stream->node.node;
- ret = lttng_ht_del(ht, &iter);
- assert(!ret);
-
- iter.iter.node = &stream->node_channel_id.node;
- ret = lttng_ht_del(consumer_data.stream_per_chan_id_ht, &iter);
- assert(!ret);
-
- iter.iter.node = &stream->node_session_id.node;
- ret = lttng_ht_del(consumer_data.stream_list_ht, &iter);
- assert(!ret);
- rcu_read_unlock();
-
- assert(consumer_data.stream_count > 0);
- consumer_data.stream_count--;
-
- if (stream->out_fd >= 0) {
- ret = close(stream->out_fd);
- if (ret) {
- PERROR("close");
- }
- }
-
- /* Check and cleanup relayd */
- rcu_read_lock();
- relayd = consumer_find_relayd(stream->net_seq_idx);
- if (relayd != NULL) {
- uatomic_dec(&relayd->refcount);
- assert(uatomic_read(&relayd->refcount) >= 0);
-
- /* Closing streams requires to lock the control socket. */
- pthread_mutex_lock(&relayd->ctrl_sock_mutex);
- ret = relayd_send_close_stream(&relayd->control_sock,
- stream->relayd_stream_id,
- stream->next_net_seq_num - 1);
- pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
- if (ret < 0) {
- DBG("Unable to close stream on the relayd. Continuing");
- /*
- * Continue here. There is nothing we can do for the relayd.
- * Chances are that the relayd has closed the socket so we just
- * continue cleaning up.
- */
- }
-
- /* Both conditions are met, we destroy the relayd. */
- if (uatomic_read(&relayd->refcount) == 0 &&
- uatomic_read(&relayd->destroy_flag)) {
- destroy_relayd(relayd);
- }
- }
- rcu_read_unlock();
-
- if (!uatomic_sub_return(&stream->chan->refcount, 1)
- && !uatomic_read(&stream->chan->nb_init_stream_left)) {
- free_chan = stream->chan;
- }
-
-end:
- consumer_data.need_update = 1;
- pthread_mutex_unlock(&stream->lock);
- pthread_mutex_unlock(&consumer_data.lock);
-
- if (free_chan) {
- consumer_del_channel(free_chan);
- }
-
-free_stream_rcu:
- call_rcu(&stream->node.head, free_stream_rcu);
+ consumer_stream_destroy(stream, ht);
}
struct lttng_consumer_stream *consumer_allocate_stream(uint64_t channel_key,
const char *channel_name,
uid_t uid,
gid_t gid,
- int relayd_id,
+ uint64_t relayd_id,
uint64_t session_id,
int cpu,
int *alloc_ret,
- enum consumer_channel_type type)
+ enum consumer_channel_type type,
+ unsigned int monitor)
{
int ret;
struct lttng_consumer_stream *stream;
stream->gid = gid;
stream->net_seq_idx = relayd_id;
stream->session_id = session_id;
+ stream->monitor = monitor;
+ stream->endpoint_status = CONSUMER_ENDPOINT_ACTIVE;
pthread_mutex_init(&stream->lock, NULL);
/* If channel is the metadata, flag this stream as metadata. */
/* Init session id node with the stream session id */
lttng_ht_node_init_u64(&stream->node_session_id, stream->session_id);
- DBG3("Allocated stream %s (key %" PRIu64 ", chan_key %" PRIu64 " relayd_id %" PRIu64 ", session_id %" PRIu64,
- stream->name, stream->key, channel_key, stream->net_seq_idx, stream->session_id);
+ DBG3("Allocated stream %s (key %" PRIu64 ", chan_key %" PRIu64
+ " relayd_id %" PRIu64 ", session_id %" PRIu64,
+ stream->name, stream->key, channel_key,
+ stream->net_seq_idx, stream->session_id);
rcu_read_unlock();
return stream;
struct lttng_ht *ht)
{
int ret = 0;
- struct consumer_relayd_sock_pair *relayd;
assert(stream);
assert(ht);
DBG3("Adding consumer stream %" PRIu64, stream->key);
pthread_mutex_lock(&consumer_data.lock);
+ pthread_mutex_lock(&stream->chan->lock);
pthread_mutex_lock(&stream->lock);
rcu_read_lock();
*/
lttng_ht_add_u64(consumer_data.stream_list_ht, &stream->node_session_id);
- /* Check and cleanup relayd */
- relayd = consumer_find_relayd(stream->net_seq_idx);
- if (relayd != NULL) {
- uatomic_inc(&relayd->refcount);
- }
-
/*
* When nb_init_stream_left reaches 0, we don't need to trigger any action
* in terms of destroying the associated channel, because the action that
rcu_read_unlock();
pthread_mutex_unlock(&stream->lock);
+ pthread_mutex_unlock(&stream->chan->lock);
pthread_mutex_unlock(&consumer_data.lock);
return ret;
* Allocate and return a consumer relayd socket.
*/
struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair(
- int net_seq_idx)
+ uint64_t net_seq_idx)
{
struct consumer_relayd_sock_pair *obj = NULL;
- /* Negative net sequence index is a failure */
- if (net_seq_idx < 0) {
+ /* net sequence index of -1 is a failure */
+ if (net_seq_idx == (uint64_t) -1ULL) {
goto error;
}
return relayd;
}
+/*
+ * Find a relayd and send the stream
+ *
+ * Returns 0 on success, < 0 on error
+ */
+int consumer_send_relayd_stream(struct lttng_consumer_stream *stream,
+ char *path)
+{
+ int ret = 0;
+ struct consumer_relayd_sock_pair *relayd;
+
+ assert(stream);
+ assert(stream->net_seq_idx != -1ULL);
+ assert(path);
+
+ /* The stream is not metadata. Get relayd reference if exists. */
+ rcu_read_lock();
+ relayd = consumer_find_relayd(stream->net_seq_idx);
+ if (relayd != NULL) {
+ /* Add stream on the relayd */
+ pthread_mutex_lock(&relayd->ctrl_sock_mutex);
+ ret = relayd_add_stream(&relayd->control_sock, stream->name,
+ path, &stream->relayd_stream_id,
+ stream->chan->tracefile_size, stream->chan->tracefile_count);
+ pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
+ if (ret < 0) {
+ goto end;
+ }
+ uatomic_inc(&relayd->refcount);
+ stream->sent_to_relayd = 1;
+ } else {
+ ERR("Stream %" PRIu64 " relayd ID %" PRIu64 " unknown. Can't send it.",
+ stream->key, stream->net_seq_idx);
+ ret = -1;
+ goto end;
+ }
+
+ DBG("Stream %s with key %" PRIu64 " sent to relayd id %" PRIu64,
+ stream->name, stream->key, stream->net_seq_idx);
+
+end:
+ rcu_read_unlock();
+ return ret;
+}
+
+/*
+ * Find a relayd and close the stream
+ */
+void close_relayd_stream(struct lttng_consumer_stream *stream)
+{
+ struct consumer_relayd_sock_pair *relayd;
+
+ /* The stream is not metadata. Get relayd reference if exists. */
+ rcu_read_lock();
+ relayd = consumer_find_relayd(stream->net_seq_idx);
+ if (relayd) {
+ consumer_stream_relayd_close(stream, relayd);
+ }
+ rcu_read_unlock();
+}
+
/*
* Handle stream for relayd transmission if the stream applies for network
* streaming where the net sequence index is set.
const char *name,
uid_t uid,
gid_t gid,
- int relayd_id,
+ uint64_t relayd_id,
enum lttng_event_output output,
uint64_t tracefile_size,
- uint64_t tracefile_count)
+ uint64_t tracefile_count,
+ uint64_t session_id_per_pid,
+ unsigned int monitor)
{
struct lttng_consumer_channel *channel;
channel->key = key;
channel->refcount = 0;
channel->session_id = session_id;
+ channel->session_id_per_pid = session_id_per_pid;
channel->uid = uid;
channel->gid = gid;
channel->relayd_id = relayd_id;
channel->output = output;
channel->tracefile_size = tracefile_size;
channel->tracefile_count = tracefile_count;
+ channel->monitor = monitor;
+ pthread_mutex_init(&channel->lock, NULL);
+
+ /*
+ * In monitor mode, the streams associated with the channel will be put in
+ * a special list ONLY owned by this channel. So, the refcount is set to 1
+ * here meaning that the channel itself has streams that are referenced.
+ *
+ * On a channel deletion, once the channel is no longer visible, the
+ * refcount is decremented and checked for a zero value to delete it. With
+ * streams in no monitor mode, it will now be safe to destroy the channel.
+ */
+ if (!channel->monitor) {
+ channel->refcount = 1;
+ }
strncpy(channel->pathname, pathname, sizeof(channel->pathname));
channel->pathname[sizeof(channel->pathname) - 1] = '\0';
struct lttng_ht_iter iter;
pthread_mutex_lock(&consumer_data.lock);
+ pthread_mutex_lock(&channel->lock);
rcu_read_lock();
lttng_ht_lookup(consumer_data.channel_ht, &channel->key, &iter);
end:
rcu_read_unlock();
+ pthread_mutex_unlock(&channel->lock);
pthread_mutex_unlock(&consumer_data.lock);
if (!ret && channel->wait_fd != -1 &&
- channel->metadata_stream == NULL) {
+ channel->type == CONSUMER_CHANNEL_TYPE_DATA) {
notify_channel_pipe(ctx, channel, -1, CONSUMER_CHANNEL_ADD);
}
return ret;
struct lttng_consumer_local_data *ctx),
int (*recv_channel)(struct lttng_consumer_channel *channel),
int (*recv_stream)(struct lttng_consumer_stream *stream),
- int (*update_stream)(int stream_key, uint32_t state))
+ int (*update_stream)(uint64_t stream_key, uint32_t state))
{
int ret;
struct lttng_consumer_local_data *ctx;
rcu_read_lock();
/* Flag that the current stream if set for network streaming. */
- if (stream->net_seq_idx != -1) {
+ if (stream->net_seq_idx != (uint64_t) -1ULL) {
relayd = consumer_find_relayd(stream->net_seq_idx);
if (relayd == NULL) {
goto end;
rcu_read_lock();
/* Flag that the current stream if set for network streaming. */
- if (stream->net_seq_idx != -1) {
+ if (stream->net_seq_idx != (uint64_t) -1ULL) {
relayd = consumer_find_relayd(stream->net_seq_idx);
if (relayd == NULL) {
goto end;
}
pthread_mutex_lock(&consumer_data.lock);
+ pthread_mutex_lock(&stream->chan->lock);
pthread_mutex_lock(&stream->lock);
switch (consumer_data.type) {
PERROR("munmap metadata stream");
}
}
-
if (stream->wait_fd >= 0) {
ret = close(stream->wait_fd);
if (ret < 0) {
/* Both conditions are met, we destroy the relayd. */
if (uatomic_read(&relayd->refcount) == 0 &&
uatomic_read(&relayd->destroy_flag)) {
- destroy_relayd(relayd);
+ consumer_destroy_relayd(relayd);
}
}
rcu_read_unlock();
stream->chan->metadata_stream = NULL;
pthread_mutex_unlock(&stream->lock);
+ pthread_mutex_unlock(&stream->chan->lock);
pthread_mutex_unlock(&consumer_data.lock);
if (free_chan) {
struct lttng_ht *ht)
{
int ret = 0;
- struct consumer_relayd_sock_pair *relayd;
struct lttng_ht_iter iter;
struct lttng_ht_node_u64 *node;
DBG3("Adding metadata stream %" PRIu64 " to hash table", stream->key);
pthread_mutex_lock(&consumer_data.lock);
+ pthread_mutex_lock(&stream->chan->lock);
pthread_mutex_lock(&stream->lock);
/*
node = lttng_ht_iter_get_node_u64(&iter);
assert(!node);
- /* Find relayd and, if one is found, increment refcount. */
- relayd = consumer_find_relayd(stream->net_seq_idx);
- if (relayd != NULL) {
- uatomic_inc(&relayd->refcount);
- }
-
/*
* When nb_init_stream_left reaches 0, we don't need to trigger any action
* in terms of destroying the associated channel, because the action that
rcu_read_unlock();
pthread_mutex_unlock(&stream->lock);
+ pthread_mutex_unlock(&stream->chan->lock);
pthread_mutex_unlock(&consumer_data.lock);
return ret;
}
goto end;
}
- local_stream = zmalloc(sizeof(struct lttng_consumer_stream));
+ local_stream = zmalloc(sizeof(struct lttng_consumer_stream *));
+ if (local_stream == NULL) {
+ PERROR("local_stream malloc");
+ goto end;
+ }
while (1) {
high_prio = 0;
lttng_poll_del(&events, chan->wait_fd);
ret = lttng_ht_del(channel_ht, &iter);
assert(ret == 0);
- assert(cds_list_empty(&chan->streams.head));
consumer_close_channel_streams(chan);
/* Release our own refcount */
* This will create a relayd socket pair and add it to the relayd hash table.
* The caller MUST acquire a RCU read side lock before calling it.
*/
-int consumer_add_relayd_socket(int net_seq_idx, int sock_type,
+int consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type,
struct lttng_consumer_local_data *ctx, int sock,
struct pollfd *consumer_sockpoll,
- struct lttcomm_relayd_sock *relayd_sock, unsigned int sessiond_id)
+ struct lttcomm_relayd_sock *relayd_sock, uint64_t sessiond_id)
{
int fd = -1, ret = -1, relayd_created = 0;
enum lttng_error_code ret_code = LTTNG_OK;
assert(ctx);
assert(relayd_sock);
- DBG("Consumer adding relayd socket (idx: %d)", net_seq_idx);
-
- /* First send a status message before receiving the fds. */
- ret = consumer_send_status_msg(sock, ret_code);
- if (ret < 0) {
- /* Somehow, the session daemon is not responding anymore. */
- goto error;
- }
+ DBG("Consumer adding relayd socket (idx: %" PRIu64 ")", net_seq_idx);
/* Get relayd reference if exists. */
relayd = consumer_find_relayd(net_seq_idx);
if (relayd == NULL) {
+ assert(sock_type == LTTNG_STREAM_CONTROL);
/* Not found. Allocate one. */
relayd = consumer_allocate_relayd_sock_pair(net_seq_idx);
if (relayd == NULL) {
- lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR);
- ret = -1;
+ ret = -ENOMEM;
+ ret_code = LTTCOMM_CONSUMERD_ENOMEM;
goto error;
+ } else {
+ relayd->sessiond_session_id = sessiond_id;
+ relayd_created = 1;
}
- relayd->sessiond_session_id = (uint64_t) sessiond_id;
- relayd_created = 1;
+
+ /*
+ * This code path MUST continue to the consumer send status message to
+ * we can notify the session daemon and continue our work without
+ * killing everything.
+ */
+ } else {
+ /*
+ * relayd key should never be found for control socket.
+ */
+ assert(sock_type != LTTNG_STREAM_CONTROL);
+ }
+
+ /* First send a status message before receiving the fds. */
+ ret = consumer_send_status_msg(sock, LTTNG_OK);
+ if (ret < 0) {
+ /* Somehow, the session daemon is not responding anymore. */
+ lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL);
+ goto error_nosignal;
}
/* Poll on consumer socket. */
if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) {
+ lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR);
ret = -EINTR;
- goto error;
+ goto error_nosignal;
}
/* Get relayd socket from session daemon */
ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1);
if (ret != sizeof(fd)) {
- lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD);
ret = -1;
fd = -1; /* Just in case it gets set with an invalid value. */
- goto error_close;
- }
- /* We have the fds without error. Send status back. */
- ret = consumer_send_status_msg(sock, ret_code);
- if (ret < 0) {
- /* Somehow, the session daemon is not responding anymore. */
+ /*
+ * Failing to receive FDs might indicate a major problem such as
+ * reaching a fd limit during the receive where the kernel returns a
+ * MSG_CTRUNC and fails to cleanup the fd in the queue. Any case, we
+ * don't take any chances and stop everything.
+ *
+ * XXX: Feature request #558 will fix that and avoid this possible
+ * issue when reaching the fd limit.
+ */
+ lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD);
+ ret_code = LTTCOMM_CONSUMERD_ERROR_RECV_FD;
goto error;
}
/* Copy received lttcomm socket */
lttcomm_copy_sock(&relayd->control_sock.sock, &relayd_sock->sock);
ret = lttcomm_create_sock(&relayd->control_sock.sock);
- /* Immediately try to close the created socket if valid. */
- if (relayd->control_sock.sock.fd >= 0) {
- if (close(relayd->control_sock.sock.fd)) {
- PERROR("close relayd control socket");
- }
- }
/* Handle create_sock error. */
if (ret < 0) {
+ ret_code = LTTCOMM_CONSUMERD_ENOMEM;
goto error;
}
+ /*
+ * Close the socket created internally by
+ * lttcomm_create_sock, so we can replace it by the one
+ * received from sessiond.
+ */
+ if (close(relayd->control_sock.sock.fd)) {
+ PERROR("close");
+ }
/* Assign new file descriptor */
relayd->control_sock.sock.fd = fd;
+ fd = -1; /* For error path */
/* Assign version values. */
relayd->control_sock.major = relayd_sock->major;
relayd->control_sock.minor = relayd_sock->minor;
*/
(void) relayd_close(&relayd->control_sock);
(void) relayd_close(&relayd->data_sock);
+ ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL;
goto error;
}
/* Copy received lttcomm socket */
lttcomm_copy_sock(&relayd->data_sock.sock, &relayd_sock->sock);
ret = lttcomm_create_sock(&relayd->data_sock.sock);
- /* Immediately try to close the created socket if valid. */
- if (relayd->data_sock.sock.fd >= 0) {
- if (close(relayd->data_sock.sock.fd)) {
- PERROR("close relayd data socket");
- }
- }
/* Handle create_sock error. */
if (ret < 0) {
+ ret_code = LTTCOMM_CONSUMERD_ENOMEM;
goto error;
}
+ /*
+ * Close the socket created internally by
+ * lttcomm_create_sock, so we can replace it by the one
+ * received from sessiond.
+ */
+ if (close(relayd->data_sock.sock.fd)) {
+ PERROR("close");
+ }
/* Assign new file descriptor */
relayd->data_sock.sock.fd = fd;
+ fd = -1; /* for eventual error paths */
/* Assign version values. */
relayd->data_sock.major = relayd_sock->major;
relayd->data_sock.minor = relayd_sock->minor;
default:
ERR("Unknown relayd socket type (%d)", sock_type);
ret = -1;
+ ret_code = LTTCOMM_CONSUMERD_FATAL;
goto error;
}
sock_type == LTTNG_STREAM_CONTROL ? "control" : "data",
relayd->net_seq_idx, fd);
+ /* We successfully added the socket. Send status back. */
+ ret = consumer_send_status_msg(sock, ret_code);
+ if (ret < 0) {
+ /* Somehow, the session daemon is not responding anymore. */
+ lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL);
+ goto error_nosignal;
+ }
+
/*
* Add relayd socket pair to consumer data hashtable. If object already
* exists or on error, the function gracefully returns.
return 0;
error:
+ if (consumer_send_status_msg(sock, ret_code) < 0) {
+ lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL);
+ }
+
+error_nosignal:
/* Close received socket if valid. */
if (fd >= 0) {
if (close(fd)) {
}
}
-error_close:
if (relayd_created) {
free(relayd);
}
return lttcomm_send_unix_sock(sock, &msg, sizeof(msg));
}
+
+/*
+ * Using a maximum stream size with the produced and consumed position of a
+ * stream, computes the new consumed position to be as close as possible to the
+ * maximum possible stream size.
+ *
+ * If maximum stream size is lower than the possible buffer size (produced -
+ * consumed), the consumed_pos given is returned untouched else the new value
+ * is returned.
+ */
+unsigned long consumer_get_consumed_maxsize(unsigned long consumed_pos,
+ unsigned long produced_pos, uint64_t max_stream_size)
+{
+ if (max_stream_size && max_stream_size < (produced_pos - consumed_pos)) {
+ /* Offset from the produced position to get the latest buffers. */
+ return produced_pos - max_stream_size;
+ }
+
+ return consumed_pos;
+}
projects / lttng-tools.git / blobdiff