+++ /dev/null
-/*
- * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 2 only,
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#define _GNU_SOURCE
-#include <errno.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <inttypes.h>
-
-#include <common/common.h>
-#include <common/consumer.h>
-#include <common/defaults.h>
-
-#include "consumer.h"
-#include "ust-consumer.h"
-
-/*
- * Return allocated full pathname of the session using the consumer trace path
- * and subdir if available. On a successful allocation, the directory of the
- * trace is created with the session credentials.
- *
- * The caller can safely free(3) the returned value. On error, NULL is
- * returned.
- */
-static char *setup_trace_path(struct consumer_output *consumer,
- struct ust_app_session *ua_sess)
-{
- int ret;
- char *pathname;
-
- assert(consumer);
- assert(ua_sess);
-
- health_code_update();
-
- /* Allocate our self the string to make sure we never exceed PATH_MAX. */
- pathname = zmalloc(PATH_MAX);
- if (!pathname) {
- goto error;
- }
-
- /* Get correct path name destination */
- if (consumer->type == CONSUMER_DST_LOCAL) {
- /* Set application path to the destination path */
- ret = snprintf(pathname, PATH_MAX, "%s/%s/%s",
- consumer->dst.trace_path, consumer->subdir, ua_sess->path);
- if (ret < 0) {
- PERROR("snprintf channel path");
- goto error;
- }
-
- /* Create directory. Ignore if exist. */
- ret = run_as_mkdir_recursive(pathname, S_IRWXU | S_IRWXG, ua_sess->uid,
- ua_sess->gid);
- if (ret < 0) {
- if (ret != -EEXIST) {
- ERR("Trace directory creation error");
- goto error;
- }
- }
- } else {
- ret = snprintf(pathname, PATH_MAX, "%s/%s", consumer->subdir,
- ua_sess->path);
- if (ret < 0) {
- PERROR("snprintf channel path");
- goto error;
- }
- }
-
- return pathname;
-
-error:
- free(pathname);
- return NULL;
-}
-
-/*
- * Send a single channel to the consumer using command ADD_CHANNEL.
- *
- * Consumer socket 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)
-{
- int ret;
- uint64_t key;
- char *pathname = NULL;
- struct lttcomm_consumer_msg msg;
-
- assert(ua_sess);
- assert(ua_chan);
- assert(socket);
- assert(consumer);
-
- DBG2("Asking UST consumer for channel");
-
- /* Get and create full trace path of session. */
- pathname = setup_trace_path(consumer, ua_sess);
- if (!pathname) {
- ret = -1;
- goto error;
- }
-
- 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,
- (int) ua_chan->attr.output,
- (int) ua_chan->attr.type,
- ua_sess->id,
- pathname,
- ua_chan->name,
- ua_sess->uid,
- ua_sess->gid,
- consumer->net_seq_index,
- ua_chan->key,
- ua_sess->registry.uuid);
-
- health_code_update();
-
- ret = lttcomm_send_unix_sock(socket->fd, &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. */
- assert(key == ua_chan->key);
- /* We need at least one where 1 stream for 1 cpu. */
- 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.
- *
- * 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)
-{
- int ret;
-
- assert(ua_sess);
- assert(ua_chan);
- assert(consumer);
- assert(socket);
- assert(socket->fd >= 0);
-
- pthread_mutex_lock(socket->lock);
-
- ret = ask_channel_creation(ua_sess, ua_chan, consumer, socket);
- if (ret < 0) {
- goto error;
- }
-
-error:
- pthread_mutex_unlock(socket->lock);
- 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;
-
- assert(ua_chan);
- assert(socket);
- assert(socket->fd >= 0);
-
- 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 = ustctl_recv_channel_from_consumer(socket->fd, &ua_chan->obj);
- if (ret < 0) {
- if (ret != -EPIPE) {
- ERR("Error recv channel from consumer %d with ret %d",
- socket->fd, 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 = ustctl_recv_stream_from_consumer(socket->fd, &stream->obj);
- if (ret < 0) {
- free(stream);
- if (ret == -LTTNG_UST_ERR_NOENT) {
- DBG3("UST app consumer has no more stream available");
- ret = 0;
- break;
- }
- if (ret != -EPIPE) {
- ERR("Recv stream from consumer %d with ret %d",
- socket->fd, 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 succesfully", ua_chan->streams.count);
- }
-
- /* This MUST match or else we have a synchronization problem. */
- 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;
-
- assert(ua_chan);
- assert(socket);
- assert(socket->fd >= 0);
-
- 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;
-
- assert(app);
- assert(stream);
- assert(channel);
-
- DBG2("UST consumer send stream to app %d", app->sock);
-
- /* Relay stream to application. */
- ret = ustctl_send_stream_to_ust(app->sock, channel->obj, stream->obj);
- if (ret < 0) {
- if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("Error ustctl send stream %s to app pid: %d with ret %d",
- stream->name, app->pid, ret);
- } else {
- DBG3("UST app send stream to ust failed. Application is dead.");
- }
- 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;
-
- assert(app);
- assert(ua_sess);
- assert(channel);
- assert(channel->obj);
-
- DBG2("UST app send channel to app sock %d pid %d (name: %s, key: %lu)",
- app->sock, app->pid, channel->name, channel->key);
-
- /* Send stream to application. */
- ret = ustctl_send_channel_to_ust(app->sock, ua_sess->handle, channel->obj);
- if (ret < 0) {
- if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("Error ustctl send channel %s to app pid: %d with ret %d",
- channel->name, app->pid, ret);
- } else {
- DBG3("UST app send channel to ust failed. Application is dead.");
- }
- goto error;
- }
-
-error:
- return ret;
-}
-
-/*
- * Send metadata string to consumer.
- *
- * Return 0 on success else a negative value.
- */
-int ust_consumer_push_metadata(struct consumer_socket *socket,
- struct ust_app_session *ua_sess, char *metadata_str,
- size_t len, size_t target_offset)
-{
- int ret;
- struct lttcomm_consumer_msg msg;
-
- assert(socket);
- assert(socket->fd >= 0);
- assert(ua_sess);
- assert(ua_sess->metadata);
-
- DBG2("UST consumer push metadata to consumer socket %d", socket->fd);
-
- msg.cmd_type = LTTNG_CONSUMER_PUSH_METADATA;
- msg.u.push_metadata.key = ua_sess->metadata->key;
- msg.u.push_metadata.target_offset = target_offset;
- msg.u.push_metadata.len = len;
-
- /*
- * TODO: reenable these locks when the consumerd gets the ability to
- * reorder the metadata it receives. This fits with locking in
- * src/bin/lttng-sessiond/ust-app.c:push_metadata()
- *
- * pthread_mutex_lock(socket->lock);
- */
-
- health_code_update();
- ret = consumer_send_msg(socket, &msg);
- if (ret < 0) {
- goto error;
- }
-
- DBG3("UST consumer push metadata on sock %d of len %lu", socket->fd, len);
-
- ret = lttcomm_send_unix_sock(socket->fd, metadata_str, len);
- if (ret < 0) {
- fprintf(stderr, "send error: %d\n", ret);
- goto error;
- }
-
- health_code_update();
- ret = consumer_recv_status_reply(socket);
- if (ret < 0) {
- goto error;
- }
-
-error:
- health_code_update();
- /*
- * pthread_mutex_unlock(socket->lock);
- */
- return ret;
-}
-
-/*
- * Send a close metdata command to consumer using the given channel key.
- *
- * Return 0 on success else a negative value.
- */
-int ust_consumer_close_metadata(struct consumer_socket *socket,
- struct ust_app_channel *ua_chan)
-{
- int ret;
- struct lttcomm_consumer_msg msg;
-
- assert(ua_chan);
- assert(socket);
- assert(socket->fd >= 0);
-
- DBG2("UST consumer close metadata channel key %lu", ua_chan->key);
-
- msg.cmd_type = LTTNG_CONSUMER_CLOSE_METADATA;
- msg.u.close_metadata.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 setup metdata command to consumer using the given channel key.
- *
- * Return 0 on success else a negative value.
- */
-int ust_consumer_setup_metadata(struct consumer_socket *socket,
- struct ust_app_channel *ua_chan)
-{
- int ret;
- struct lttcomm_consumer_msg msg;
-
- assert(ua_chan);
- assert(socket);
- assert(socket->fd >= 0);
-
- DBG2("UST consumer setup metadata channel key %lu", ua_chan->key);
-
- msg.cmd_type = LTTNG_CONSUMER_SETUP_METADATA;
- msg.u.setup_metadata.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;
-}
projects / lttng-tools.git / blobdiff