Commit | Line | Data |
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48842b30 DG |
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 | ||
990570ed | 25 | #include <common/common.h> |
db758600 | 26 | #include <common/consumer.h> |
990570ed | 27 | #include <common/defaults.h> |
10a8a223 | 28 | #include <common/sessiond-comm/sessiond-comm.h> |
48842b30 | 29 | |
48842b30 DG |
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, | |
6df2e2c9 MD |
36 | struct ust_app_channel *uchan, |
37 | uid_t uid, gid_t gid) | |
48842b30 | 38 | { |
8010679a | 39 | int ret, fd; |
48842b30 | 40 | struct lttcomm_consumer_msg lum; |
d80a6244 | 41 | struct ltt_ust_stream *stream, *tmp; |
48842b30 DG |
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 | /* | |
7ad0a0cb MD |
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. | |
48842b30 DG |
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) { | |
df0f840b | 61 | PERROR("send consumer channel"); |
48842b30 DG |
62 | goto error; |
63 | } | |
8010679a MD |
64 | fd = uchan->obj->shm_fd; |
65 | ret = lttcomm_send_fds_unix_sock(sock, &fd, 1); | |
48842b30 | 66 | if (ret < 0) { |
df0f840b | 67 | PERROR("send consumer channel ancillary data"); |
48842b30 DG |
68 | goto error; |
69 | } | |
70 | ||
d80a6244 | 71 | cds_list_for_each_entry_safe(stream, tmp, &uchan->streams.head, list) { |
48842b30 DG |
72 | int fds[2]; |
73 | ||
74 | if (!stream->obj->shm_fd) { | |
5af2f756 | 75 | continue; |
48842b30 | 76 | } |
48842b30 DG |
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; | |
d41f73b7 MD |
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; | |
48842b30 | 86 | lum.u.stream.mmap_len = stream->obj->memory_map_size; |
6df2e2c9 MD |
87 | lum.u.stream.uid = uid; |
88 | lum.u.stream.gid = gid; | |
48842b30 DG |
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) { | |
df0f840b | 94 | PERROR("send consumer stream"); |
48842b30 DG |
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) { | |
df0f840b | 102 | PERROR("send consumer stream ancillary data"); |
48842b30 DG |
103 | goto error; |
104 | } | |
48842b30 | 105 | } |
48842b30 DG |
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; | |
bec39940 | 122 | struct lttng_ht_iter iter; |
48842b30 | 123 | struct lttcomm_consumer_msg lum; |
bec39940 | 124 | struct ust_app_channel *ua_chan; |
48842b30 DG |
125 | |
126 | DBG("Sending metadata stream fd"); | |
127 | ||
7753dea8 MD |
128 | if (consumer_fd < 0) { |
129 | ERR("Consumer has negative file descriptor"); | |
130 | return -EINVAL; | |
131 | } | |
132 | ||
48842b30 | 133 | if (usess->metadata->obj->shm_fd != 0) { |
8010679a | 134 | int fd; |
48842b30 DG |
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; | |
3ee75e9c | 141 | lum.u.channel.mmap_len = usess->metadata->obj->memory_map_size; |
ee6b7fb2 | 142 | DBG("Sending metadata channel %d to consumer", lum.u.channel.channel_key); |
48842b30 DG |
143 | ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum)); |
144 | if (ret < 0) { | |
df0f840b | 145 | PERROR("send consumer channel"); |
48842b30 DG |
146 | goto error; |
147 | } | |
8010679a MD |
148 | fd = usess->metadata->obj->shm_fd; |
149 | ret = lttcomm_send_fds_unix_sock(sock, &fd, 1); | |
48842b30 | 150 | if (ret < 0) { |
df0f840b | 151 | PERROR("send consumer metadata channel"); |
48842b30 DG |
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; | |
6df2e2c9 MD |
162 | lum.u.stream.uid = usess->uid; |
163 | lum.u.stream.gid = usess->gid; | |
48842b30 DG |
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) { | |
df0f840b | 169 | PERROR("send consumer metadata stream"); |
48842b30 DG |
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) { | |
df0f840b | 176 | PERROR("send consumer stream"); |
48842b30 DG |
177 | goto error; |
178 | } | |
179 | } | |
180 | ||
181 | /* Send each channel fd streams of session */ | |
182 | rcu_read_lock(); | |
bec39940 DG |
183 | cds_lfht_for_each_entry(usess->channels->ht, &iter.iter, ua_chan, |
184 | node.node) { | |
aeb96892 DG |
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 | ||
bec39940 | 193 | ret = send_channel_streams(sock, ua_chan, usess->uid, usess->gid); |
48842b30 | 194 | if (ret < 0) { |
5485f822 | 195 | rcu_read_unlock(); |
48842b30 DG |
196 | goto error; |
197 | } | |
48842b30 DG |
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 | } |