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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 | ||
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 | { | |
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) { | |
61 | perror("send consumer channel"); | |
62 | goto error; | |
63 | } | |
8010679a MD |
64 | fd = uchan->obj->shm_fd; |
65 | ret = lttcomm_send_fds_unix_sock(sock, &fd, 1); | |
48842b30 DG |
66 | if (ret < 0) { |
67 | perror("send consumer channel ancillary data"); | |
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 DG |
86 | lum.u.stream.mmap_len = stream->obj->memory_map_size; |
87 | strncpy(lum.u.stream.path_name, stream->pathname, PATH_MAX - 1); | |
88 | lum.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
89 | DBG("Sending stream %d to consumer", lum.u.stream.stream_key); | |
90 | ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum)); | |
91 | if (ret < 0) { | |
92 | perror("send consumer stream"); | |
93 | goto error; | |
94 | } | |
95 | ||
96 | fds[0] = stream->obj->shm_fd; | |
97 | fds[1] = stream->obj->wait_fd; | |
98 | ret = lttcomm_send_fds_unix_sock(sock, fds, 2); | |
99 | if (ret < 0) { | |
100 | perror("send consumer stream ancillary data"); | |
101 | goto error; | |
102 | } | |
d80a6244 DG |
103 | |
104 | /* | |
105 | * We release the stream object here, as we have passed | |
106 | * it to the consumer. | |
107 | */ | |
108 | /* Ensure we don't let the app know (sock = -1). */ | |
109 | ustctl_release_object(-1, stream->obj); | |
110 | cds_list_del(&stream->list); | |
111 | free(stream); | |
48842b30 | 112 | } |
d80a6244 DG |
113 | /* Ensure we don't let the app know (sock = -1). */ |
114 | ustctl_release_object(-1, uchan->obj); | |
48842b30 DG |
115 | |
116 | DBG("consumer channel streams sent"); | |
117 | ||
118 | return 0; | |
119 | ||
120 | error: | |
121 | return ret; | |
122 | } | |
123 | ||
124 | /* | |
125 | * Send all stream fds of the UST session to the consumer. | |
126 | */ | |
127 | int ust_consumer_send_session(int consumer_fd, struct ust_app_session *usess) | |
128 | { | |
129 | int ret = 0; | |
130 | int sock = consumer_fd; | |
131 | struct cds_lfht_iter iter; | |
132 | struct cds_lfht_node *node; | |
133 | struct lttcomm_consumer_msg lum; | |
134 | struct ust_app_channel *uchan; | |
135 | ||
136 | DBG("Sending metadata stream fd"); | |
137 | ||
138 | if (usess->metadata->obj->shm_fd != 0) { | |
8010679a | 139 | int fd; |
48842b30 DG |
140 | int fds[2]; |
141 | ||
142 | /* Send metadata channel fd */ | |
143 | lum.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
144 | lum.u.channel.channel_key = usess->metadata->obj->shm_fd; | |
145 | lum.u.channel.max_sb_size = usess->metadata->attr.subbuf_size; | |
3ee75e9c | 146 | lum.u.channel.mmap_len = usess->metadata->obj->memory_map_size; |
ee6b7fb2 | 147 | DBG("Sending metadata channel %d to consumer", lum.u.channel.channel_key); |
48842b30 DG |
148 | ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum)); |
149 | if (ret < 0) { | |
150 | perror("send consumer channel"); | |
151 | goto error; | |
152 | } | |
8010679a MD |
153 | fd = usess->metadata->obj->shm_fd; |
154 | ret = lttcomm_send_fds_unix_sock(sock, &fd, 1); | |
48842b30 DG |
155 | if (ret < 0) { |
156 | perror("send consumer metadata channel"); | |
157 | goto error; | |
158 | } | |
159 | ||
160 | /* Send metadata stream fd */ | |
161 | lum.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
162 | lum.u.stream.channel_key = usess->metadata->obj->shm_fd; | |
163 | lum.u.stream.stream_key = usess->metadata->stream_obj->shm_fd; | |
164 | lum.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; | |
165 | lum.u.stream.output = DEFAULT_UST_CHANNEL_OUTPUT; | |
166 | lum.u.stream.mmap_len = usess->metadata->stream_obj->memory_map_size; | |
167 | strncpy(lum.u.stream.path_name, usess->metadata->pathname, PATH_MAX - 1); | |
168 | lum.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
169 | DBG("Sending metadata stream %d to consumer", lum.u.stream.stream_key); | |
170 | ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum)); | |
171 | if (ret < 0) { | |
172 | perror("send consumer metadata stream"); | |
173 | goto error; | |
174 | } | |
175 | fds[0] = usess->metadata->stream_obj->shm_fd; | |
176 | fds[1] = usess->metadata->stream_obj->wait_fd; | |
177 | ret = lttcomm_send_fds_unix_sock(sock, fds, 2); | |
178 | if (ret < 0) { | |
179 | perror("send consumer stream"); | |
180 | goto error; | |
181 | } | |
d80a6244 DG |
182 | /* Metadata fds passed to consumer, release them. */ |
183 | /* Ensure we don't let the app know (sock = -1). */ | |
184 | ustctl_release_object(-1, usess->metadata->stream_obj); | |
185 | ustctl_release_object(-1, usess->metadata->obj); | |
48842b30 DG |
186 | } |
187 | ||
188 | /* Send each channel fd streams of session */ | |
189 | rcu_read_lock(); | |
190 | hashtable_get_first(usess->channels, &iter); | |
191 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { | |
192 | uchan = caa_container_of(node, struct ust_app_channel, node); | |
193 | ||
194 | ret = send_channel_streams(sock, uchan); | |
195 | if (ret < 0) { | |
5485f822 | 196 | rcu_read_unlock(); |
48842b30 DG |
197 | goto error; |
198 | } | |
199 | hashtable_get_next(usess->channels, &iter); | |
200 | } | |
201 | rcu_read_unlock(); | |
202 | ||
203 | DBG("consumer fds (metadata and channel streams) sent"); | |
204 | ||
205 | return 0; | |
206 | ||
207 | error: | |
208 | return ret; | |
209 | } |