DBG("Kernel session created (fd: %d)", lks->fd);
+ /*
+ * This is necessary since the creation time is present in the session
+ * name when it is generated.
+ */
+ if (session->has_auto_generated_name) {
+ ret = kernctl_session_set_name(lks->fd, DEFAULT_SESSION_NAME);
+ } else {
+ ret = kernctl_session_set_name(lks->fd, session->name);
+ }
+ if (ret) {
+ WARN("Could not set kernel session name for session %" PRIu64 " name: %s",
+ session->id, session->name);
+ }
+
+ ret = kernctl_session_set_creation_time(lks->fd, session->creation_time);
+ if (ret) {
+ WARN("Could not set kernel session creation time for session %" PRIu64 " name: %s",
+ session->id, session->name);
+ }
+
return 0;
error:
return ret;
}
+static struct lttng_tracker_list *get_id_tracker_list(
+ struct ltt_kernel_session *session,
+ enum lttng_tracker_type tracker_type)
+{
+ switch (tracker_type) {
+ case LTTNG_TRACKER_PID:
+ return session->tracker_list_pid;
+ case LTTNG_TRACKER_VPID:
+ return session->tracker_list_vpid;
+ case LTTNG_TRACKER_UID:
+ return session->tracker_list_uid;
+ case LTTNG_TRACKER_VUID:
+ return session->tracker_list_vuid;
+ case LTTNG_TRACKER_GID:
+ return session->tracker_list_gid;
+ case LTTNG_TRACKER_VGID:
+ return session->tracker_list_vgid;
+ default:
+ return NULL;
+ }
+}
-int kernel_track_pid(struct ltt_kernel_session *session, int pid)
+int kernel_track_id(enum lttng_tracker_type tracker_type,
+ struct ltt_kernel_session *session,
+ const struct lttng_tracker_id *id)
{
- int ret;
+ int ret, value;
+ struct lttng_tracker_list *tracker_list;
+ struct lttng_tracker_id **saved_ids;
+ ssize_t saved_ids_count;
- DBG("Kernel track PID %d for session id %" PRIu64 ".",
- pid, session->id);
- ret = kernctl_track_pid(session->fd, pid);
- if (!ret) {
- return LTTNG_OK;
+ ret = lttng_tracker_id_lookup_string(tracker_type, id, &value);
+ if (ret != LTTNG_OK) {
+ return ret;
}
- switch (-ret) {
- case EINVAL:
+
+ tracker_list = get_id_tracker_list(session, tracker_type);
+ if (!tracker_list) {
return LTTNG_ERR_INVALID;
- case ENOMEM:
- return LTTNG_ERR_NOMEM;
- case EEXIST:
- return LTTNG_ERR_PID_TRACKED;
- default:
- return LTTNG_ERR_UNK;
}
-}
-int kernel_untrack_pid(struct ltt_kernel_session *session, int pid)
-{
- int ret;
+ /* Save list for restore on error. */
+ saved_ids_count = lttng_tracker_id_get_list(tracker_list, &saved_ids);
+ if (saved_ids_count < 0) {
+ return LTTNG_ERR_INVALID;
+ }
- DBG("Kernel untrack PID %d for session id %" PRIu64 ".",
- pid, session->id);
- ret = kernctl_untrack_pid(session->fd, pid);
- if (!ret) {
- return LTTNG_OK;
+ /* Add to list. */
+ ret = lttng_tracker_list_add(tracker_list, id);
+ if (ret != LTTNG_OK) {
+ goto end;
}
+
+ switch (tracker_type) {
+ case LTTNG_TRACKER_PID:
+ DBG("Kernel track PID %d for session id %" PRIu64 ".", value,
+ session->id);
+ ret = kernctl_track_pid(session->fd, value);
+ if (!ret) {
+ ret = LTTNG_OK;
+ goto end;
+ }
+ break;
+ case LTTNG_TRACKER_VPID:
+ DBG("Kernel track VPID %d for session id %" PRIu64 ".", value,
+ session->id);
+ ret = kernctl_track_id(session->fd, LTTNG_TRACKER_VPID, value);
+ if (!ret) {
+ ret = LTTNG_OK;
+ goto end;
+ }
+ break;
+ case LTTNG_TRACKER_UID:
+ DBG("Kernel track UID %d for session id %" PRIu64 ".", value,
+ session->id);
+ ret = kernctl_track_id(session->fd, LTTNG_TRACKER_UID, value);
+ if (!ret) {
+ ret = LTTNG_OK;
+ goto end;
+ }
+ break;
+ case LTTNG_TRACKER_GID:
+ DBG("Kernel track GID %d for session id %" PRIu64 ".", value,
+ session->id);
+ ret = kernctl_track_id(session->fd, LTTNG_TRACKER_GID, value);
+ if (!ret) {
+ ret = LTTNG_OK;
+ goto end;
+ }
+ break;
+ case LTTNG_TRACKER_VUID:
+ DBG("Kernel track VUID %d for session id %" PRIu64 ".", value,
+ session->id);
+ ret = kernctl_track_id(session->fd, LTTNG_TRACKER_VUID, value);
+ if (!ret) {
+ ret = LTTNG_OK;
+ goto end;
+ }
+ break;
+ case LTTNG_TRACKER_VGID:
+ DBG("Kernel track VGID %d for session id %" PRIu64 ".", value,
+ session->id);
+ ret = kernctl_track_id(session->fd, LTTNG_TRACKER_VGID, value);
+ if (!ret) {
+ ret = LTTNG_OK;
+ goto end;
+ }
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ /* Error handling. */
switch (-ret) {
case EINVAL:
- return LTTNG_ERR_INVALID;
+ ret = LTTNG_ERR_INVALID;
+ break;
case ENOMEM:
- return LTTNG_ERR_NOMEM;
- case ENOENT:
- return LTTNG_ERR_PID_NOT_TRACKED;
+ ret = LTTNG_ERR_NOMEM;
+ break;
+ case EEXIST:
+ ret = LTTNG_ERR_ID_TRACKED;
+ break;
default:
- return LTTNG_ERR_UNK;
+ ret = LTTNG_ERR_UNK;
+ break;
}
+
+ if (lttng_tracker_id_set_list(tracker_list, saved_ids,
+ saved_ids_count) != LTTNG_OK) {
+ ERR("Error on tracker add error handling.\n");
+ }
+end:
+ lttng_tracker_ids_destroy(saved_ids, saved_ids_count);
+ free(saved_ids);
+ return ret;
}
-ssize_t kernel_list_tracker_pids(struct ltt_kernel_session *session,
- int **_pids)
+int kernel_untrack_id(enum lttng_tracker_type tracker_type,
+ struct ltt_kernel_session *session,
+ const struct lttng_tracker_id *id)
{
- int fd, ret;
- int pid;
- ssize_t nbmem, count = 0;
- FILE *fp;
- int *pids;
+ int ret, value;
+ struct lttng_tracker_list *tracker_list;
+ struct lttng_tracker_id **saved_ids;
+ ssize_t saved_ids_count;
- fd = kernctl_list_tracker_pids(session->fd);
- if (fd < 0) {
- PERROR("kernel tracker pids list");
- goto error;
+ ret = lttng_tracker_id_lookup_string(tracker_type, id, &value);
+ if (ret != LTTNG_OK) {
+ return ret;
}
- fp = fdopen(fd, "r");
- if (fp == NULL) {
- PERROR("kernel tracker pids list fdopen");
- goto error_fp;
+ tracker_list = get_id_tracker_list(session, tracker_type);
+ if (!tracker_list) {
+ return LTTNG_ERR_INVALID;
}
-
- nbmem = KERNEL_TRACKER_PIDS_INIT_LIST_SIZE;
- pids = zmalloc(sizeof(*pids) * nbmem);
- if (pids == NULL) {
- PERROR("alloc list pids");
- count = -ENOMEM;
+ /* Save list for restore on error. */
+ saved_ids_count = lttng_tracker_id_get_list(tracker_list, &saved_ids);
+ if (saved_ids_count < 0) {
+ return LTTNG_ERR_INVALID;
+ }
+ /* Remove from list. */
+ ret = lttng_tracker_list_remove(tracker_list, id);
+ if (ret != LTTNG_OK) {
goto end;
}
- while (fscanf(fp, "process { pid = %u; };\n", &pid) == 1) {
- if (count >= nbmem) {
- int *new_pids;
- size_t new_nbmem;
-
- new_nbmem = nbmem << 1;
- DBG("Reallocating pids list from %zu to %zu entries",
- nbmem, new_nbmem);
- new_pids = realloc(pids, new_nbmem * sizeof(*new_pids));
- if (new_pids == NULL) {
- PERROR("realloc list events");
- free(pids);
- count = -ENOMEM;
- goto end;
- }
- /* Zero the new memory */
- memset(new_pids + nbmem, 0,
- (new_nbmem - nbmem) * sizeof(*new_pids));
- nbmem = new_nbmem;
- pids = new_pids;
+ switch (tracker_type) {
+ case LTTNG_TRACKER_PID:
+ DBG("Kernel untrack PID %d for session id %" PRIu64 ".", value,
+ session->id);
+ ret = kernctl_untrack_pid(session->fd, value);
+ if (!ret) {
+ ret = LTTNG_OK;
+ goto end;
}
- pids[count++] = pid;
+ break;
+ case LTTNG_TRACKER_VPID:
+ DBG("Kernel untrack VPID %d for session id %" PRIu64 ".", value,
+ session->id);
+ ret = kernctl_untrack_id(
+ session->fd, LTTNG_TRACKER_VPID, value);
+ if (!ret) {
+ ret = LTTNG_OK;
+ goto end;
+ }
+ break;
+ case LTTNG_TRACKER_UID:
+ DBG("Kernel untrack UID %d for session id %" PRIu64 ".", value,
+ session->id);
+ ret = kernctl_untrack_id(session->fd, LTTNG_TRACKER_UID, value);
+ if (!ret) {
+ ret = LTTNG_OK;
+ goto end;
+ }
+ break;
+ case LTTNG_TRACKER_GID:
+ DBG("Kernel untrack GID %d for session id %" PRIu64 ".", value,
+ session->id);
+ ret = kernctl_untrack_id(session->fd, LTTNG_TRACKER_GID, value);
+ if (!ret) {
+ ret = LTTNG_OK;
+ goto end;
+ }
+ break;
+ case LTTNG_TRACKER_VUID:
+ DBG("Kernel untrack VUID %d for session id %" PRIu64 ".", value,
+ session->id);
+ ret = kernctl_untrack_id(
+ session->fd, LTTNG_TRACKER_VUID, value);
+ if (!ret) {
+ ret = LTTNG_OK;
+ goto end;
+ }
+ break;
+ case LTTNG_TRACKER_VGID:
+ DBG("Kernel untrack VGID %d for session id %" PRIu64 ".", value,
+ session->id);
+ ret = kernctl_untrack_id(
+ session->fd, LTTNG_TRACKER_VGID, value);
+ if (!ret) {
+ ret = LTTNG_OK;
+ goto end;
+ }
+ break;
+ default:
+ ret = -EINVAL;
+ break;
}
- *_pids = pids;
- DBG("Kernel list tracker pids done (%zd pids)", count);
-end:
- ret = fclose(fp); /* closes both fp and fd */
- if (ret) {
- PERROR("fclose");
+ /* Error handling. */
+ switch (-ret) {
+ case EINVAL:
+ ret = LTTNG_ERR_INVALID;
+ break;
+ case ENOMEM:
+ ret = LTTNG_ERR_NOMEM;
+ break;
+ case EEXIST:
+ ret = LTTNG_ERR_ID_TRACKED;
+ break;
+ default:
+ ret = LTTNG_ERR_UNK;
+ break;
}
- return count;
-error_fp:
- ret = close(fd);
- if (ret) {
- PERROR("close");
+ if (lttng_tracker_id_set_list(tracker_list, saved_ids,
+ saved_ids_count) != LTTNG_OK) {
+ ERR("Error on tracker remove error handling.\n");
}
-error:
- return -1;
+end:
+ lttng_tracker_ids_destroy(saved_ids, saved_ids_count);
+ free(saved_ids);
+ return ret;
+}
+
+/*
+ * Called with session lock held.
+ */
+ssize_t kernel_list_tracker_ids(enum lttng_tracker_type tracker_type,
+ struct ltt_kernel_session *session,
+ struct lttng_tracker_id ***_ids)
+{
+ struct lttng_tracker_list *tracker_list;
+
+ tracker_list = get_id_tracker_list(session, tracker_type);
+ if (!tracker_list) {
+ return -LTTNG_ERR_INVALID;
+ }
+ return lttng_tracker_id_get_list(tracker_list, _ids);
}
/*
struct lttng_ht_iter iter;
struct ltt_kernel_metadata *saved_metadata;
char *trace_path = NULL;
+ size_t consumer_path_offset = 0;
assert(ksess);
assert(ksess->consumer);
}
trace_path = setup_channel_trace_path(ksess->consumer,
- DEFAULT_KERNEL_TRACE_DIR);
+ DEFAULT_KERNEL_TRACE_DIR, &consumer_path_offset);
if (!trace_path) {
status = LTTNG_ERR_INVALID;
goto error;
cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
status = consumer_snapshot_channel(socket, chan->key, output, 0,
ksess->uid, ksess->gid,
- trace_path, wait,
+ &trace_path[consumer_path_offset], wait,
nb_packets_per_stream);
if (status != LTTNG_OK) {
(void) kernel_consumer_destroy_metadata(socket,
/* Snapshot metadata, */
status = consumer_snapshot_channel(socket, ksess->metadata->key, output,
- 1, ksess->uid, ksess->gid, trace_path, wait, 0);
+ 1, ksess->uid, ksess->gid, &trace_path[consumer_path_offset],
+ wait, 0);
if (status != LTTNG_OK) {
goto error_consumer;
}
return ret;
}
+/*
+ * Check for the support of the packet sequence number via abi version number.
+ *
+ * Return 1 on success, 0 when feature is not supported, negative value in case
+ * of errors.
+ */
+int kernel_supports_ring_buffer_packet_sequence_number(void)
+{
+ int ret = 0; // Not supported by default
+ struct lttng_kernel_tracer_abi_version abi;
+
+ ret = kernctl_tracer_abi_version(kernel_tracer_fd, &abi);
+ if (ret < 0) {
+ ERR("Failed to retrieve lttng-modules ABI version");
+ goto error;
+ }
+
+ /*
+ * Packet sequence number was introduced in LTTng 2.8,
+ * lttng-modules ABI 2.1.
+ */
+ if (abi.major >= 2 && abi.minor >= 1) {
+ /* Supported */
+ ret = 1;
+ } else {
+ /* Not supported */
+ ret = 0;
+ }
+error:
+ return ret;
+}
+
/*
* Rotate a kernel session.
*
{
return kernel_tracer_fd >= 0;
}
+
+/*
+ * Clear a kernel session.
+ *
+ * Return LTTNG_OK on success or else an LTTng error code.
+ */
+enum lttng_error_code kernel_clear_session(struct ltt_session *session)
+{
+ int ret;
+ enum lttng_error_code status = LTTNG_OK;
+ struct consumer_socket *socket;
+ struct lttng_ht_iter iter;
+ struct ltt_kernel_session *ksess = session->kernel_session;
+
+ assert(ksess);
+ assert(ksess->consumer);
+
+ DBG("Clear kernel session %s (session %" PRIu64 ")",
+ session->name, session->id);
+
+ rcu_read_lock();
+
+ if (ksess->active) {
+ ERR("Expecting inactive session %s (%" PRIu64 ")", session->name, session->id);
+ status = LTTNG_ERR_FATAL;
+ goto end;
+ }
+
+ /*
+ * Note that this loop will end after one iteration given that there is
+ * only one kernel consumer.
+ */
+ cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
+ socket, node.node) {
+ struct ltt_kernel_channel *chan;
+
+ /* For each channel, ask the consumer to clear it. */
+ cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
+ DBG("Clear kernel channel %" PRIu64 ", session %s",
+ chan->key, session->name);
+ ret = consumer_clear_channel(socket, chan->key);
+ if (ret < 0) {
+ goto error;
+ }
+ }
+
+ if (!ksess->metadata) {
+ /*
+ * Nothing to do for the metadata.
+ * This is a snapshot session.
+ * The metadata is genererated on the fly.
+ */
+ continue;
+ }
+
+ /*
+ * Clear the metadata channel.
+ * Metadata channel is not cleared per se but we still need to
+ * perform a rotation operation on it behind the scene.
+ */
+ ret = consumer_clear_channel(socket, ksess->metadata->key);
+ if (ret < 0) {
+ goto error;
+ }
+ }
+
+ goto end;
+error:
+ switch (-ret) {
+ case LTTCOMM_CONSUMERD_RELAYD_CLEAR_DISALLOWED:
+ status = LTTNG_ERR_CLEAR_RELAY_DISALLOWED;
+ break;
+ default:
+ status = LTTNG_ERR_CLEAR_FAIL_CONSUMER;
+ break;
+ }
+end:
+ rcu_read_unlock();
+ return status;
+}
projects / lttng-tools.git / blobdiff