--- /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 as published by the Free
+ * Software Foundation; only version 2 of the License.
+ *
+ * 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., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#define _GNU_SOURCE
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <lttngerr.h>
+#include <lttng-share.h>
+#include <lttng-sessiond-comm.h>
+#include <lttng/lttng-consumer.h>
+
+#include "hashtable.h"
+#include "ust-consumer.h"
+
+/*
+ * Send all stream fds of UST channel to the consumer.
+ */
+static int send_channel_streams(int sock,
+ struct ust_app_channel *uchan)
+{
+ int ret, fds[2];
+ struct ltt_ust_stream *stream;
+ struct lttcomm_consumer_msg lum;
+ struct cds_lfht_iter iter;
+ struct cds_lfht_node *node;
+
+ DBG("Sending streams of channel %s to UST consumer", uchan->name);
+
+ /* Send channel */
+ lum.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
+
+ /*
+ * We need to keep shm_fd open to make sure this key stays unique within
+ * the session daemon.
+ */
+ lum.u.channel.channel_key = uchan->obj->shm_fd;
+ lum.u.channel.max_sb_size = uchan->attr.subbuf_size;
+ lum.u.channel.mmap_len = uchan->obj->memory_map_size;
+ DBG("Sending channel %d to consumer", lum.u.channel.channel_key);
+ ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum));
+ if (ret < 0) {
+ perror("send consumer channel");
+ goto error;
+ }
+ fds[0] = uchan->obj->shm_fd;
+ fds[1] = uchan->obj->wait_fd;
+ ret = lttcomm_send_fds_unix_sock(sock, fds, 2);
+ if (ret < 0) {
+ perror("send consumer channel ancillary data");
+ goto error;
+ }
+
+
+ rcu_read_lock();
+ hashtable_get_first(uchan->streams, &iter);
+ while ((node = hashtable_iter_get_node(&iter)) != NULL) {
+ stream = caa_container_of(node, struct ltt_ust_stream, node);
+
+ int fds[2];
+
+ if (!stream->obj->shm_fd) {
+ goto next;
+ }
+
+ lum.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
+ lum.u.stream.channel_key = uchan->obj->shm_fd;
+ lum.u.stream.stream_key = stream->obj->shm_fd;
+ lum.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
+ lum.u.stream.output = uchan->attr.output;
+ lum.u.stream.mmap_len = stream->obj->memory_map_size;
+ strncpy(lum.u.stream.path_name, stream->pathname, PATH_MAX - 1);
+ lum.u.stream.path_name[PATH_MAX - 1] = '\0';
+ DBG("Sending stream %d to consumer", lum.u.stream.stream_key);
+ ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum));
+ if (ret < 0) {
+ perror("send consumer stream");
+ goto error;
+ }
+
+ fds[0] = stream->obj->shm_fd;
+ fds[1] = stream->obj->wait_fd;
+ ret = lttcomm_send_fds_unix_sock(sock, fds, 2);
+ if (ret < 0) {
+ perror("send consumer stream ancillary data");
+ goto error;
+ }
+
+next:
+ hashtable_get_next(uchan->streams, &iter);
+ }
+ rcu_read_unlock();
+
+ DBG("consumer channel streams sent");
+
+ return 0;
+
+error:
+ return ret;
+}
+
+/*
+ * Send all stream fds of the UST session to the consumer.
+ */
+int ust_consumer_send_session(int consumer_fd, struct ust_app_session *usess)
+{
+ int ret = 0;
+ int sock = consumer_fd;
+ struct cds_lfht_iter iter;
+ struct cds_lfht_node *node;
+ struct lttcomm_consumer_msg lum;
+ struct ust_app_channel *uchan;
+
+ DBG("Sending metadata stream fd");
+
+ if (usess->metadata->obj->shm_fd != 0) {
+ int fds[2];
+
+ /* Send metadata channel fd */
+ lum.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
+ lum.u.channel.channel_key = usess->metadata->obj->shm_fd;
+ lum.u.channel.max_sb_size = usess->metadata->attr.subbuf_size;
+ lum.u.channel.mmap_len = 0; /* for kernel */
+ DBG("Sending metadata channel %d to consumer", lum.u.stream.stream_key);
+ ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum));
+ if (ret < 0) {
+ perror("send consumer channel");
+ goto error;
+ }
+ fds[0] = usess->metadata->obj->shm_fd;
+ fds[1] = usess->metadata->obj->wait_fd;
+ ret = lttcomm_send_fds_unix_sock(sock, fds, 2);
+ if (ret < 0) {
+ perror("send consumer metadata channel");
+ goto error;
+ }
+
+ /* Send metadata stream fd */
+ lum.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
+ lum.u.stream.channel_key = usess->metadata->obj->shm_fd;
+ lum.u.stream.stream_key = usess->metadata->stream_obj->shm_fd;
+ lum.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
+ lum.u.stream.output = DEFAULT_UST_CHANNEL_OUTPUT;
+ lum.u.stream.mmap_len = usess->metadata->stream_obj->memory_map_size;
+ strncpy(lum.u.stream.path_name, usess->metadata->pathname, PATH_MAX - 1);
+ lum.u.stream.path_name[PATH_MAX - 1] = '\0';
+ DBG("Sending metadata stream %d to consumer", lum.u.stream.stream_key);
+ ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum));
+ if (ret < 0) {
+ perror("send consumer metadata stream");
+ goto error;
+ }
+ fds[0] = usess->metadata->stream_obj->shm_fd;
+ fds[1] = usess->metadata->stream_obj->wait_fd;
+ ret = lttcomm_send_fds_unix_sock(sock, fds, 2);
+ if (ret < 0) {
+ perror("send consumer stream");
+ goto error;
+ }
+ }
+
+ /* Send each channel fd streams of session */
+ rcu_read_lock();
+ hashtable_get_first(usess->channels, &iter);
+ while ((node = hashtable_iter_get_node(&iter)) != NULL) {
+ uchan = caa_container_of(node, struct ust_app_channel, node);
+
+ ret = send_channel_streams(sock, uchan);
+ if (ret < 0) {
+ goto error;
+ }
+ hashtable_get_next(usess->channels, &iter);
+ }
+ rcu_read_unlock();
+
+ DBG("consumer fds (metadata and channel streams) sent");
+
+ return 0;
+
+error:
+ return ret;
+}
projects / lttng-tools.git / blobdiff