X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=ltt-sessiond%2Fust-consumer.c;fp=ltt-sessiond%2Fust-consumer.c;h=b3b97552e2c3754502cc7eb2ac1521b43eb541b3;hp=0000000000000000000000000000000000000000;hb=48842b309b2000205367409c0f29ca40ec3e251c;hpb=d6b189345152f407360bc287997d38d30054bd2c diff --git a/ltt-sessiond/ust-consumer.c b/ltt-sessiond/ust-consumer.c new file mode 100644 index 000000000..b3b97552e --- /dev/null +++ b/ltt-sessiond/ust-consumer.c @@ -0,0 +1,199 @@ +/* + * Copyright (C) 2011 - David Goulet + * + * 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 +#include +#include +#include +#include + +#include +#include +#include +#include + +#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; +}