| 1 | /* |
| 2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU General Public License as published by the Free |
| 6 | * Software Foundation; only version 2 of the License. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 11 | * more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along with |
| 14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple |
| 15 | * Place - Suite 330, Boston, MA 02111-1307, USA. |
| 16 | */ |
| 17 | |
| 18 | #define _GNU_SOURCE |
| 19 | #include <errno.h> |
| 20 | #include <stdio.h> |
| 21 | #include <stdlib.h> |
| 22 | #include <string.h> |
| 23 | #include <unistd.h> |
| 24 | |
| 25 | #include <common/common.h> |
| 26 | #include <common/consumer.h> |
| 27 | #include <common/defaults.h> |
| 28 | #include <common/sessiond-comm/sessiond-comm.h> |
| 29 | |
| 30 | #include "ust-consumer.h" |
| 31 | |
| 32 | /* |
| 33 | * Send all stream fds of UST channel to the consumer. |
| 34 | */ |
| 35 | static int send_channel_streams(int sock, |
| 36 | struct ust_app_channel *uchan, |
| 37 | uid_t uid, gid_t gid) |
| 38 | { |
| 39 | int ret, fd; |
| 40 | struct lttcomm_consumer_msg lum; |
| 41 | struct ltt_ust_stream *stream, *tmp; |
| 42 | |
| 43 | DBG("Sending streams of channel %s to UST consumer", uchan->name); |
| 44 | |
| 45 | /* Send channel */ |
| 46 | lum.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; |
| 47 | |
| 48 | /* |
| 49 | * We need to keep shm_fd open while we transfer the stream file |
| 50 | * descriptors to make sure this key stays unique within the |
| 51 | * session daemon. We can free the channel shm_fd without |
| 52 | * problem after we finished sending stream fds for that |
| 53 | * channel. |
| 54 | */ |
| 55 | lum.u.channel.channel_key = uchan->obj->shm_fd; |
| 56 | lum.u.channel.max_sb_size = uchan->attr.subbuf_size; |
| 57 | lum.u.channel.mmap_len = uchan->obj->memory_map_size; |
| 58 | DBG("Sending channel %d to consumer", lum.u.channel.channel_key); |
| 59 | ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum)); |
| 60 | if (ret < 0) { |
| 61 | PERROR("send consumer channel"); |
| 62 | goto error; |
| 63 | } |
| 64 | fd = uchan->obj->shm_fd; |
| 65 | ret = lttcomm_send_fds_unix_sock(sock, &fd, 1); |
| 66 | if (ret < 0) { |
| 67 | PERROR("send consumer channel ancillary data"); |
| 68 | goto error; |
| 69 | } |
| 70 | |
| 71 | cds_list_for_each_entry_safe(stream, tmp, &uchan->streams.head, list) { |
| 72 | int fds[2]; |
| 73 | |
| 74 | if (!stream->obj->shm_fd) { |
| 75 | continue; |
| 76 | } |
| 77 | lum.cmd_type = LTTNG_CONSUMER_ADD_STREAM; |
| 78 | lum.u.stream.channel_key = uchan->obj->shm_fd; |
| 79 | lum.u.stream.stream_key = stream->obj->shm_fd; |
| 80 | lum.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; |
| 81 | /* |
| 82 | * FIXME Hack alert! we force MMAP for now. Mixup |
| 83 | * between EVENT and UST enums elsewhere. |
| 84 | */ |
| 85 | lum.u.stream.output = DEFAULT_UST_CHANNEL_OUTPUT; |
| 86 | lum.u.stream.mmap_len = stream->obj->memory_map_size; |
| 87 | lum.u.stream.uid = uid; |
| 88 | lum.u.stream.gid = gid; |
| 89 | strncpy(lum.u.stream.path_name, stream->pathname, PATH_MAX - 1); |
| 90 | lum.u.stream.path_name[PATH_MAX - 1] = '\0'; |
| 91 | DBG("Sending stream %d to consumer", lum.u.stream.stream_key); |
| 92 | ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum)); |
| 93 | if (ret < 0) { |
| 94 | PERROR("send consumer stream"); |
| 95 | goto error; |
| 96 | } |
| 97 | |
| 98 | fds[0] = stream->obj->shm_fd; |
| 99 | fds[1] = stream->obj->wait_fd; |
| 100 | ret = lttcomm_send_fds_unix_sock(sock, fds, 2); |
| 101 | if (ret < 0) { |
| 102 | PERROR("send consumer stream ancillary data"); |
| 103 | goto error; |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | DBG("consumer channel streams sent"); |
| 108 | |
| 109 | return 0; |
| 110 | |
| 111 | error: |
| 112 | return ret; |
| 113 | } |
| 114 | |
| 115 | /* |
| 116 | * Send all stream fds of the UST session to the consumer. |
| 117 | */ |
| 118 | int ust_consumer_send_session(int consumer_fd, struct ust_app_session *usess) |
| 119 | { |
| 120 | int ret = 0; |
| 121 | int sock = consumer_fd; |
| 122 | struct lttng_ht_iter iter; |
| 123 | struct lttcomm_consumer_msg lum; |
| 124 | struct ust_app_channel *ua_chan; |
| 125 | |
| 126 | DBG("Sending metadata stream fd"); |
| 127 | |
| 128 | if (consumer_fd < 0) { |
| 129 | ERR("Consumer has negative file descriptor"); |
| 130 | return -EINVAL; |
| 131 | } |
| 132 | |
| 133 | if (usess->metadata->obj->shm_fd != 0) { |
| 134 | int fd; |
| 135 | int fds[2]; |
| 136 | |
| 137 | /* Send metadata channel fd */ |
| 138 | lum.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; |
| 139 | lum.u.channel.channel_key = usess->metadata->obj->shm_fd; |
| 140 | lum.u.channel.max_sb_size = usess->metadata->attr.subbuf_size; |
| 141 | lum.u.channel.mmap_len = usess->metadata->obj->memory_map_size; |
| 142 | DBG("Sending metadata channel %d to consumer", lum.u.channel.channel_key); |
| 143 | ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum)); |
| 144 | if (ret < 0) { |
| 145 | PERROR("send consumer channel"); |
| 146 | goto error; |
| 147 | } |
| 148 | fd = usess->metadata->obj->shm_fd; |
| 149 | ret = lttcomm_send_fds_unix_sock(sock, &fd, 1); |
| 150 | if (ret < 0) { |
| 151 | PERROR("send consumer metadata channel"); |
| 152 | goto error; |
| 153 | } |
| 154 | |
| 155 | /* Send metadata stream fd */ |
| 156 | lum.cmd_type = LTTNG_CONSUMER_ADD_STREAM; |
| 157 | lum.u.stream.channel_key = usess->metadata->obj->shm_fd; |
| 158 | lum.u.stream.stream_key = usess->metadata->stream_obj->shm_fd; |
| 159 | lum.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; |
| 160 | lum.u.stream.output = DEFAULT_UST_CHANNEL_OUTPUT; |
| 161 | lum.u.stream.mmap_len = usess->metadata->stream_obj->memory_map_size; |
| 162 | lum.u.stream.uid = usess->uid; |
| 163 | lum.u.stream.gid = usess->gid; |
| 164 | strncpy(lum.u.stream.path_name, usess->metadata->pathname, PATH_MAX - 1); |
| 165 | lum.u.stream.path_name[PATH_MAX - 1] = '\0'; |
| 166 | DBG("Sending metadata stream %d to consumer", lum.u.stream.stream_key); |
| 167 | ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum)); |
| 168 | if (ret < 0) { |
| 169 | PERROR("send consumer metadata stream"); |
| 170 | goto error; |
| 171 | } |
| 172 | fds[0] = usess->metadata->stream_obj->shm_fd; |
| 173 | fds[1] = usess->metadata->stream_obj->wait_fd; |
| 174 | ret = lttcomm_send_fds_unix_sock(sock, fds, 2); |
| 175 | if (ret < 0) { |
| 176 | PERROR("send consumer stream"); |
| 177 | goto error; |
| 178 | } |
| 179 | } |
| 180 | |
| 181 | /* Send each channel fd streams of session */ |
| 182 | rcu_read_lock(); |
| 183 | cds_lfht_for_each_entry(usess->channels->ht, &iter.iter, ua_chan, |
| 184 | node.node) { |
| 185 | /* |
| 186 | * Indicate that the channel was not created on the tracer side so skip |
| 187 | * sending unexisting streams. |
| 188 | */ |
| 189 | if (ua_chan->obj == NULL) { |
| 190 | continue; |
| 191 | } |
| 192 | |
| 193 | ret = send_channel_streams(sock, ua_chan, usess->uid, usess->gid); |
| 194 | if (ret < 0) { |
| 195 | rcu_read_unlock(); |
| 196 | goto error; |
| 197 | } |
| 198 | } |
| 199 | rcu_read_unlock(); |
| 200 | |
| 201 | DBG("consumer fds (metadata and channel streams) sent"); |
| 202 | |
| 203 | return 0; |
| 204 | |
| 205 | error: |
| 206 | return ret; |
| 207 | } |