Fix link to git repository
[lttng-tools.git] / lttng-sessiond / ust-consumer.c
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 <lttngerr.h>
26 #include <lttng-share.h>
27 #include <lttng-sessiond-comm.h>
28 #include <lttng/lttng-consumer.h>
29
30 #include "hashtable.h"
31 #include "ust-consumer.h"
32
33 /*
34 * Send all stream fds of UST channel to the consumer.
35 */
36 static int send_channel_streams(int sock,
37 struct ust_app_channel *uchan)
38 {
39 int ret, fd;
40 struct lttcomm_consumer_msg lum;
41 struct ltt_ust_stream *stream;
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 to make sure this key stays unique within
50 * the session daemon.
51 */
52 lum.u.channel.channel_key = uchan->obj->shm_fd;
53 lum.u.channel.max_sb_size = uchan->attr.subbuf_size;
54 lum.u.channel.mmap_len = uchan->obj->memory_map_size;
55 DBG("Sending channel %d to consumer", lum.u.channel.channel_key);
56 ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum));
57 if (ret < 0) {
58 perror("send consumer channel");
59 goto error;
60 }
61 fd = uchan->obj->shm_fd;
62 ret = lttcomm_send_fds_unix_sock(sock, &fd, 1);
63 if (ret < 0) {
64 perror("send consumer channel ancillary data");
65 goto error;
66 }
67
68 cds_list_for_each_entry(stream, &uchan->streams.head, list) {
69 int fds[2];
70
71 if (!stream->obj->shm_fd) {
72 continue;
73 }
74 lum.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
75 lum.u.stream.channel_key = uchan->obj->shm_fd;
76 lum.u.stream.stream_key = stream->obj->shm_fd;
77 lum.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
78 /*
79 * FIXME Hack alert! we force MMAP for now. Mixup
80 * between EVENT and UST enums elsewhere.
81 */
82 lum.u.stream.output = DEFAULT_UST_CHANNEL_OUTPUT;
83 lum.u.stream.mmap_len = stream->obj->memory_map_size;
84 strncpy(lum.u.stream.path_name, stream->pathname, PATH_MAX - 1);
85 lum.u.stream.path_name[PATH_MAX - 1] = '\0';
86 DBG("Sending stream %d to consumer", lum.u.stream.stream_key);
87 ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum));
88 if (ret < 0) {
89 perror("send consumer stream");
90 goto error;
91 }
92
93 fds[0] = stream->obj->shm_fd;
94 fds[1] = stream->obj->wait_fd;
95 ret = lttcomm_send_fds_unix_sock(sock, fds, 2);
96 if (ret < 0) {
97 perror("send consumer stream ancillary data");
98 goto error;
99 }
100 }
101
102 DBG("consumer channel streams sent");
103
104 return 0;
105
106 error:
107 return ret;
108 }
109
110 /*
111 * Send all stream fds of the UST session to the consumer.
112 */
113 int ust_consumer_send_session(int consumer_fd, struct ust_app_session *usess)
114 {
115 int ret = 0;
116 int sock = consumer_fd;
117 struct cds_lfht_iter iter;
118 struct cds_lfht_node *node;
119 struct lttcomm_consumer_msg lum;
120 struct ust_app_channel *uchan;
121
122 DBG("Sending metadata stream fd");
123
124 if (usess->metadata->obj->shm_fd != 0) {
125 int fd;
126 int fds[2];
127
128 /* Send metadata channel fd */
129 lum.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
130 lum.u.channel.channel_key = usess->metadata->obj->shm_fd;
131 lum.u.channel.max_sb_size = usess->metadata->attr.subbuf_size;
132 lum.u.channel.mmap_len = usess->metadata->obj->memory_map_size;
133 DBG("Sending metadata channel %d to consumer", lum.u.channel.channel_key);
134 ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum));
135 if (ret < 0) {
136 perror("send consumer channel");
137 goto error;
138 }
139 fd = usess->metadata->obj->shm_fd;
140 ret = lttcomm_send_fds_unix_sock(sock, &fd, 1);
141 if (ret < 0) {
142 perror("send consumer metadata channel");
143 goto error;
144 }
145
146 /* Send metadata stream fd */
147 lum.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
148 lum.u.stream.channel_key = usess->metadata->obj->shm_fd;
149 lum.u.stream.stream_key = usess->metadata->stream_obj->shm_fd;
150 lum.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
151 lum.u.stream.output = DEFAULT_UST_CHANNEL_OUTPUT;
152 lum.u.stream.mmap_len = usess->metadata->stream_obj->memory_map_size;
153 strncpy(lum.u.stream.path_name, usess->metadata->pathname, PATH_MAX - 1);
154 lum.u.stream.path_name[PATH_MAX - 1] = '\0';
155 DBG("Sending metadata stream %d to consumer", lum.u.stream.stream_key);
156 ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum));
157 if (ret < 0) {
158 perror("send consumer metadata stream");
159 goto error;
160 }
161 fds[0] = usess->metadata->stream_obj->shm_fd;
162 fds[1] = usess->metadata->stream_obj->wait_fd;
163 ret = lttcomm_send_fds_unix_sock(sock, fds, 2);
164 if (ret < 0) {
165 perror("send consumer stream");
166 goto error;
167 }
168 }
169
170 /* Send each channel fd streams of session */
171 rcu_read_lock();
172 hashtable_get_first(usess->channels, &iter);
173 while ((node = hashtable_iter_get_node(&iter)) != NULL) {
174 uchan = caa_container_of(node, struct ust_app_channel, node);
175
176 ret = send_channel_streams(sock, uchan);
177 if (ret < 0) {
178 rcu_read_unlock();
179 goto error;
180 }
181 hashtable_get_next(usess->channels, &iter);
182 }
183 rcu_read_unlock();
184
185 DBG("consumer fds (metadata and channel streams) sent");
186
187 return 0;
188
189 error:
190 return ret;
191 }
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