+++ /dev/null
-/*
- * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
- *
- * SPDX-License-Identifier: GPL-2.0-only
- *
- */
-
-#define _LGPL_SOURCE
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <inttypes.h>
-
-#include <common/compat/errno.h>
-#include <common/common.h>
-#include <common/consumer/consumer.h>
-#include <common/defaults.h>
-
-#include "consumer.h"
-#include "health-sessiond.h"
-#include "ust-consumer.h"
-#include "lttng-ust-error.h"
-#include "buffer-registry.h"
-#include "session.h"
-#include "lttng-sessiond.h"
-
-/*
- * Send a single channel to the consumer using command ASK_CHANNEL_CREATION.
- *
- * Consumer socket lock MUST be acquired before calling this.
- */
-static int ask_channel_creation(struct ust_app_session *ua_sess,
- struct ust_app_channel *ua_chan,
- struct consumer_output *consumer,
- struct consumer_socket *socket,
- struct ust_registry_session *registry,
- struct lttng_trace_chunk *trace_chunk)
-{
- int ret, output;
- uint32_t chan_id;
- uint64_t key, chan_reg_key;
- char *pathname = NULL;
- struct lttcomm_consumer_msg msg;
- struct ust_registry_channel *ust_reg_chan;
- char shm_path[PATH_MAX] = "";
- char root_shm_path[PATH_MAX] = "";
- bool is_local_trace;
- size_t consumer_path_offset = 0;
-
- LTTNG_ASSERT(ua_sess);
- LTTNG_ASSERT(ua_chan);
- LTTNG_ASSERT(socket);
- LTTNG_ASSERT(consumer);
- LTTNG_ASSERT(registry);
-
- DBG2("Asking UST consumer for channel");
-
- is_local_trace = consumer->net_seq_index == -1ULL;
- /* Format the channel's path (relative to the current trace chunk). */
- pathname = setup_channel_trace_path(consumer, ua_sess->path,
- &consumer_path_offset);
- if (!pathname) {
- ret = -1;
- goto error;
- }
-
- if (is_local_trace && trace_chunk) {
- enum lttng_trace_chunk_status chunk_status;
- char *pathname_index;
-
- ret = asprintf(&pathname_index, "%s/" DEFAULT_INDEX_DIR,
- pathname);
- if (ret < 0) {
- ERR("Failed to format channel index directory");
- ret = -1;
- goto error;
- }
-
- /*
- * Create the index subdirectory which will take care
- * of implicitly creating the channel's path.
- */
- chunk_status = lttng_trace_chunk_create_subdirectory(
- trace_chunk, pathname_index);
- free(pathname_index);
- if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
- ret = -1;
- goto error;
- }
- }
-
- /* Depending on the buffer type, a different channel key is used. */
- if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) {
- chan_reg_key = ua_chan->tracing_channel_id;
- } else {
- chan_reg_key = ua_chan->key;
- }
-
- if (ua_chan->attr.type == LTTNG_UST_ABI_CHAN_METADATA) {
- chan_id = -1U;
- /*
- * Metadata channels shm_path (buffers) are handled within
- * session daemon. Consumer daemon should not try to create
- * those buffer files.
- */
- } else {
- ust_reg_chan = ust_registry_channel_find(registry, chan_reg_key);
- LTTNG_ASSERT(ust_reg_chan);
- chan_id = ust_reg_chan->chan_id;
- if (ua_sess->shm_path[0]) {
- strncpy(shm_path, ua_sess->shm_path, sizeof(shm_path));
- shm_path[sizeof(shm_path) - 1] = '\0';
- strncat(shm_path, "/",
- sizeof(shm_path) - strlen(shm_path) - 1);
- strncat(shm_path, ua_chan->name,
- sizeof(shm_path) - strlen(shm_path) - 1);
- strncat(shm_path, "_",
- sizeof(shm_path) - strlen(shm_path) - 1);
- }
- strncpy(root_shm_path, ua_sess->root_shm_path, sizeof(root_shm_path));
- root_shm_path[sizeof(root_shm_path) - 1] = '\0';
- }
-
- switch (ua_chan->attr.output) {
- case LTTNG_UST_ABI_MMAP:
- default:
- output = LTTNG_EVENT_MMAP;
- break;
- }
-
- consumer_init_ask_channel_comm_msg(&msg,
- ua_chan->attr.subbuf_size,
- ua_chan->attr.num_subbuf,
- ua_chan->attr.overwrite,
- ua_chan->attr.switch_timer_interval,
- ua_chan->attr.read_timer_interval,
- ua_sess->live_timer_interval,
- ua_sess->live_timer_interval != 0,
- ua_chan->monitor_timer_interval,
- output,
- (int) ua_chan->attr.type,
- ua_sess->tracing_id,
- &pathname[consumer_path_offset],
- ua_chan->name,
- consumer->net_seq_index,
- ua_chan->key,
- registry->uuid,
- chan_id,
- ua_chan->tracefile_size,
- ua_chan->tracefile_count,
- ua_sess->id,
- ua_sess->output_traces,
- lttng_credentials_get_uid(&ua_sess->real_credentials),
- ua_chan->attr.blocking_timeout,
- root_shm_path, shm_path,
- trace_chunk,
- &ua_sess->effective_credentials);
-
- health_code_update();
-
- ret = consumer_socket_send(socket, &msg, sizeof(msg));
- if (ret < 0) {
- goto error;
- }
-
- ret = consumer_recv_status_channel(socket, &key,
- &ua_chan->expected_stream_count);
- if (ret < 0) {
- goto error;
- }
- /* Communication protocol error. */
- LTTNG_ASSERT(key == ua_chan->key);
- /* We need at least one where 1 stream for 1 cpu. */
- if (ua_sess->output_traces) {
- LTTNG_ASSERT(ua_chan->expected_stream_count > 0);
- }
-
- DBG2("UST ask channel %" PRIu64 " successfully done with %u stream(s)", key,
- ua_chan->expected_stream_count);
-
-error:
- free(pathname);
- health_code_update();
- return ret;
-}
-
-/*
- * Ask consumer to create a channel for a given session.
- *
- * Session list and rcu read side locks must be held by the caller.
- *
- * Returns 0 on success else a negative value.
- */
-int ust_consumer_ask_channel(struct ust_app_session *ua_sess,
- struct ust_app_channel *ua_chan,
- struct consumer_output *consumer,
- struct consumer_socket *socket,
- struct ust_registry_session *registry,
- struct lttng_trace_chunk * trace_chunk)
-{
- int ret;
-
- LTTNG_ASSERT(ua_sess);
- LTTNG_ASSERT(ua_chan);
- LTTNG_ASSERT(consumer);
- LTTNG_ASSERT(socket);
- LTTNG_ASSERT(registry);
-
- if (!consumer->enabled) {
- ret = -LTTNG_ERR_NO_CONSUMER;
- DBG3("Consumer is disabled");
- goto error;
- }
-
- pthread_mutex_lock(socket->lock);
- ret = ask_channel_creation(ua_sess, ua_chan, consumer, socket, registry,
- trace_chunk);
- pthread_mutex_unlock(socket->lock);
- if (ret < 0) {
- ERR("ask_channel_creation consumer command failed");
- goto error;
- }
-
-error:
- return ret;
-}
-
-/*
- * Send a get channel command to consumer using the given channel key. The
- * channel object is populated and the stream list.
- *
- * Return 0 on success else a negative value.
- */
-int ust_consumer_get_channel(struct consumer_socket *socket,
- struct ust_app_channel *ua_chan)
-{
- int ret;
- struct lttcomm_consumer_msg msg;
-
- LTTNG_ASSERT(ua_chan);
- LTTNG_ASSERT(socket);
-
- memset(&msg, 0, sizeof(msg));
- msg.cmd_type = LTTNG_CONSUMER_GET_CHANNEL;
- msg.u.get_channel.key = ua_chan->key;
-
- pthread_mutex_lock(socket->lock);
- health_code_update();
-
- /* Send command and wait for OK reply. */
- ret = consumer_send_msg(socket, &msg);
- if (ret < 0) {
- goto error;
- }
-
- /* First, get the channel from consumer. */
- ret = lttng_ust_ctl_recv_channel_from_consumer(*socket->fd_ptr, &ua_chan->obj);
- if (ret < 0) {
- if (ret != -EPIPE) {
- ERR("Error recv channel from consumer %d with ret %d",
- *socket->fd_ptr, ret);
- } else {
- DBG3("UST app recv channel from consumer. Consumer is dead.");
- }
- goto error;
- }
-
- /* Next, get all streams. */
- while (1) {
- struct ust_app_stream *stream;
-
- /* Create UST stream */
- stream = ust_app_alloc_stream();
- if (stream == NULL) {
- ret = -ENOMEM;
- goto error;
- }
-
- /* Stream object is populated by this call if successful. */
- ret = lttng_ust_ctl_recv_stream_from_consumer(*socket->fd_ptr, &stream->obj);
- if (ret < 0) {
- free(stream);
- if (ret == -LTTNG_UST_ERR_NOENT) {
- DBG3("UST app consumer has no more stream available");
- break;
- }
- if (ret != -EPIPE) {
- ERR("Recv stream from consumer %d with ret %d",
- *socket->fd_ptr, ret);
- } else {
- DBG3("UST app recv stream from consumer. Consumer is dead.");
- }
- goto error;
- }
-
- /* Order is important this is why a list is used. */
- cds_list_add_tail(&stream->list, &ua_chan->streams.head);
- ua_chan->streams.count++;
-
- DBG2("UST app stream %d received successfully", ua_chan->streams.count);
- }
-
- /* This MUST match or else we have a synchronization problem. */
- LTTNG_ASSERT(ua_chan->expected_stream_count == ua_chan->streams.count);
-
- /* Wait for confirmation that we can proceed with the streams. */
- ret = consumer_recv_status_reply(socket);
- if (ret < 0) {
- goto error;
- }
-
-error:
- health_code_update();
- pthread_mutex_unlock(socket->lock);
- return ret;
-}
-
-/*
- * Send a destroy channel command to consumer using the given channel key.
- *
- * Note that this command MUST be used prior to a successful
- * LTTNG_CONSUMER_GET_CHANNEL because once this command is done successfully,
- * the streams are dispatched to the consumer threads and MUST be teardown
- * through the hang up process.
- *
- * Return 0 on success else a negative value.
- */
-int ust_consumer_destroy_channel(struct consumer_socket *socket,
- struct ust_app_channel *ua_chan)
-{
- int ret;
- struct lttcomm_consumer_msg msg;
-
- LTTNG_ASSERT(ua_chan);
- LTTNG_ASSERT(socket);
-
- memset(&msg, 0, sizeof(msg));
- msg.cmd_type = LTTNG_CONSUMER_DESTROY_CHANNEL;
- msg.u.destroy_channel.key = ua_chan->key;
-
- pthread_mutex_lock(socket->lock);
- health_code_update();
-
- ret = consumer_send_msg(socket, &msg);
- if (ret < 0) {
- goto error;
- }
-
-error:
- health_code_update();
- pthread_mutex_unlock(socket->lock);
- return ret;
-}
-
-/*
- * Send a given stream to UST tracer.
- *
- * On success return 0 else a negative value.
- */
-int ust_consumer_send_stream_to_ust(struct ust_app *app,
- struct ust_app_channel *channel, struct ust_app_stream *stream)
-{
- int ret;
-
- LTTNG_ASSERT(app);
- LTTNG_ASSERT(stream);
- LTTNG_ASSERT(channel);
-
- DBG2("UST consumer send stream to app %d", app->sock);
-
- /* Relay stream to application. */
- pthread_mutex_lock(&app->sock_lock);
- ret = lttng_ust_ctl_send_stream_to_ust(app->sock, channel->obj, stream->obj);
- pthread_mutex_unlock(&app->sock_lock);
- if (ret < 0) {
- if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
- DBG3("UST app send stream to ust failed. Application is dead. (pid: %d, sock: %d).",
- app->pid, app->sock);
- } else if (ret == -EAGAIN) {
- WARN("UST app send stream to ust failed. Communication time out (pid: %d, sock: %d).",
- app->pid, app->sock);
- } else {
- ERR("UST app send stream, handle %d, to ust failed with ret %d (pid: %d, sock: %d).",
- stream->obj->handle, ret, app->pid,
- app->sock);
- }
- goto error;
- }
- channel->handle = channel->obj->handle;
-
-error:
- return ret;
-}
-
-/*
- * Send channel previously received from the consumer to the UST tracer.
- *
- * On success return 0 else a negative value.
- */
-int ust_consumer_send_channel_to_ust(struct ust_app *app,
- struct ust_app_session *ua_sess, struct ust_app_channel *channel)
-{
- int ret;
-
- LTTNG_ASSERT(app);
- LTTNG_ASSERT(ua_sess);
- LTTNG_ASSERT(channel);
- LTTNG_ASSERT(channel->obj);
-
- DBG2("UST app send channel to sock %d pid %d (name: %s, key: %" PRIu64 ")",
- app->sock, app->pid, channel->name, channel->tracing_channel_id);
-
- /* Send stream to application. */
- pthread_mutex_lock(&app->sock_lock);
- ret = lttng_ust_ctl_send_channel_to_ust(app->sock, ua_sess->handle, channel->obj);
- pthread_mutex_unlock(&app->sock_lock);
- if (ret < 0) {
- if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
- DBG3("UST app send channel to ust failed. Application is dead (pid: %d, sock: %d).",
- app->pid, app->sock);
- } else if (ret == -EAGAIN) {
- WARN("UST app send channel to ust failed. Communication timeout (pid: %d, sock: %d).",
- app->pid, app->sock);
- } else {
- ERR("UST app send channel %s, to ust failed with ret %d (pid: %d, sock: %d).",
- channel->name, ret, app->pid,
- app->sock);
- }
- goto error;
- }
-
-error:
- return ret;
-}
-
-/*
- * Handle the metadata requests from the UST consumer
- *
- * Return 0 on success else a negative value.
- */
-int ust_consumer_metadata_request(struct consumer_socket *socket)
-{
- int ret;
- ssize_t ret_push;
- struct lttcomm_metadata_request_msg request;
- struct buffer_reg_uid *reg_uid;
- struct ust_registry_session *ust_reg;
- struct lttcomm_consumer_msg msg;
-
- LTTNG_ASSERT(socket);
-
- rcu_read_lock();
- health_code_update();
-
- /* Wait for a metadata request */
- pthread_mutex_lock(socket->lock);
- ret = consumer_socket_recv(socket, &request, sizeof(request));
- pthread_mutex_unlock(socket->lock);
- if (ret < 0) {
- goto end;
- }
-
- DBG("Metadata request received for session %" PRIu64 ", key %" PRIu64,
- request.session_id, request.key);
-
- reg_uid = buffer_reg_uid_find(request.session_id,
- request.bits_per_long, request.uid);
- if (reg_uid) {
- ust_reg = reg_uid->registry->reg.ust;
- } else {
- struct buffer_reg_pid *reg_pid =
- buffer_reg_pid_find(request.session_id_per_pid);
- if (!reg_pid) {
- DBG("PID registry not found for session id %" PRIu64,
- request.session_id_per_pid);
-
- memset(&msg, 0, sizeof(msg));
- msg.cmd_type = LTTNG_ERR_UND;
- pthread_mutex_lock(socket->lock);
- (void) consumer_send_msg(socket, &msg);
- pthread_mutex_unlock(socket->lock);
- /*
- * This is possible since the session might have been destroyed
- * during a consumer metadata request. So here, return gracefully
- * because the destroy session will push the remaining metadata to
- * the consumer.
- */
- ret = 0;
- goto end;
- }
- ust_reg = reg_pid->registry->reg.ust;
- }
- LTTNG_ASSERT(ust_reg);
-
- pthread_mutex_lock(&ust_reg->lock);
- ret_push = ust_app_push_metadata(ust_reg, socket, 1);
- pthread_mutex_unlock(&ust_reg->lock);
- if (ret_push == -EPIPE) {
- DBG("Application or relay closed while pushing metadata");
- } else if (ret_push < 0) {
- ERR("Pushing metadata");
- ret = -1;
- goto end;
- } else {
- DBG("UST Consumer metadata pushed successfully");
- }
- ret = 0;
-
-end:
- rcu_read_unlock();
- return ret;
-}
projects / lttng-tools.git / blobdiff