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 | ||
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, | |
6df2e2c9 MD |
37 | struct ust_app_channel *uchan, |
38 | uid_t uid, gid_t gid) | |
48842b30 | 39 | { |
8010679a | 40 | int ret, fd; |
48842b30 | 41 | struct lttcomm_consumer_msg lum; |
d80a6244 | 42 | struct ltt_ust_stream *stream, *tmp; |
48842b30 DG |
43 | |
44 | DBG("Sending streams of channel %s to UST consumer", uchan->name); | |
45 | ||
46 | /* Send channel */ | |
47 | lum.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
48 | ||
49 | /* | |
7ad0a0cb MD |
50 | * We need to keep shm_fd open while we transfer the stream file |
51 | * descriptors to make sure this key stays unique within the | |
52 | * session daemon. We can free the channel shm_fd without | |
53 | * problem after we finished sending stream fds for that | |
54 | * channel. | |
48842b30 DG |
55 | */ |
56 | lum.u.channel.channel_key = uchan->obj->shm_fd; | |
57 | lum.u.channel.max_sb_size = uchan->attr.subbuf_size; | |
58 | lum.u.channel.mmap_len = uchan->obj->memory_map_size; | |
59 | DBG("Sending channel %d to consumer", lum.u.channel.channel_key); | |
60 | ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum)); | |
61 | if (ret < 0) { | |
62 | perror("send consumer channel"); | |
63 | goto error; | |
64 | } | |
8010679a MD |
65 | fd = uchan->obj->shm_fd; |
66 | ret = lttcomm_send_fds_unix_sock(sock, &fd, 1); | |
48842b30 DG |
67 | if (ret < 0) { |
68 | perror("send consumer channel ancillary data"); | |
69 | goto error; | |
70 | } | |
71 | ||
d80a6244 | 72 | cds_list_for_each_entry_safe(stream, tmp, &uchan->streams.head, list) { |
48842b30 DG |
73 | int fds[2]; |
74 | ||
75 | if (!stream->obj->shm_fd) { | |
5af2f756 | 76 | continue; |
48842b30 | 77 | } |
48842b30 DG |
78 | lum.cmd_type = LTTNG_CONSUMER_ADD_STREAM; |
79 | lum.u.stream.channel_key = uchan->obj->shm_fd; | |
80 | lum.u.stream.stream_key = stream->obj->shm_fd; | |
81 | lum.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; | |
d41f73b7 MD |
82 | /* |
83 | * FIXME Hack alert! we force MMAP for now. Mixup | |
84 | * between EVENT and UST enums elsewhere. | |
85 | */ | |
86 | lum.u.stream.output = DEFAULT_UST_CHANNEL_OUTPUT; | |
48842b30 | 87 | lum.u.stream.mmap_len = stream->obj->memory_map_size; |
6df2e2c9 MD |
88 | lum.u.stream.uid = uid; |
89 | lum.u.stream.gid = gid; | |
48842b30 DG |
90 | strncpy(lum.u.stream.path_name, stream->pathname, PATH_MAX - 1); |
91 | lum.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
92 | DBG("Sending stream %d to consumer", lum.u.stream.stream_key); | |
93 | ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum)); | |
94 | if (ret < 0) { | |
95 | perror("send consumer stream"); | |
96 | goto error; | |
97 | } | |
98 | ||
99 | fds[0] = stream->obj->shm_fd; | |
100 | fds[1] = stream->obj->wait_fd; | |
101 | ret = lttcomm_send_fds_unix_sock(sock, fds, 2); | |
102 | if (ret < 0) { | |
103 | perror("send consumer stream ancillary data"); | |
104 | goto error; | |
105 | } | |
48842b30 | 106 | } |
48842b30 DG |
107 | |
108 | DBG("consumer channel streams sent"); | |
109 | ||
110 | return 0; | |
111 | ||
112 | error: | |
113 | return ret; | |
114 | } | |
115 | ||
116 | /* | |
117 | * Send all stream fds of the UST session to the consumer. | |
118 | */ | |
119 | int ust_consumer_send_session(int consumer_fd, struct ust_app_session *usess) | |
120 | { | |
121 | int ret = 0; | |
122 | int sock = consumer_fd; | |
123 | struct cds_lfht_iter iter; | |
124 | struct cds_lfht_node *node; | |
125 | struct lttcomm_consumer_msg lum; | |
126 | struct ust_app_channel *uchan; | |
127 | ||
128 | DBG("Sending metadata stream fd"); | |
129 | ||
7753dea8 MD |
130 | if (consumer_fd < 0) { |
131 | ERR("Consumer has negative file descriptor"); | |
132 | return -EINVAL; | |
133 | } | |
134 | ||
48842b30 | 135 | if (usess->metadata->obj->shm_fd != 0) { |
8010679a | 136 | int fd; |
48842b30 DG |
137 | int fds[2]; |
138 | ||
139 | /* Send metadata channel fd */ | |
140 | lum.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
141 | lum.u.channel.channel_key = usess->metadata->obj->shm_fd; | |
142 | lum.u.channel.max_sb_size = usess->metadata->attr.subbuf_size; | |
3ee75e9c | 143 | lum.u.channel.mmap_len = usess->metadata->obj->memory_map_size; |
ee6b7fb2 | 144 | DBG("Sending metadata channel %d to consumer", lum.u.channel.channel_key); |
48842b30 DG |
145 | ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum)); |
146 | if (ret < 0) { | |
147 | perror("send consumer channel"); | |
148 | goto error; | |
149 | } | |
8010679a MD |
150 | fd = usess->metadata->obj->shm_fd; |
151 | ret = lttcomm_send_fds_unix_sock(sock, &fd, 1); | |
48842b30 DG |
152 | if (ret < 0) { |
153 | perror("send consumer metadata channel"); | |
154 | goto error; | |
155 | } | |
156 | ||
157 | /* Send metadata stream fd */ | |
158 | lum.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
159 | lum.u.stream.channel_key = usess->metadata->obj->shm_fd; | |
160 | lum.u.stream.stream_key = usess->metadata->stream_obj->shm_fd; | |
161 | lum.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; | |
162 | lum.u.stream.output = DEFAULT_UST_CHANNEL_OUTPUT; | |
163 | lum.u.stream.mmap_len = usess->metadata->stream_obj->memory_map_size; | |
6df2e2c9 MD |
164 | lum.u.stream.uid = usess->uid; |
165 | lum.u.stream.gid = usess->gid; | |
48842b30 DG |
166 | strncpy(lum.u.stream.path_name, usess->metadata->pathname, PATH_MAX - 1); |
167 | lum.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
168 | DBG("Sending metadata stream %d to consumer", lum.u.stream.stream_key); | |
169 | ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum)); | |
170 | if (ret < 0) { | |
171 | perror("send consumer metadata stream"); | |
172 | goto error; | |
173 | } | |
174 | fds[0] = usess->metadata->stream_obj->shm_fd; | |
175 | fds[1] = usess->metadata->stream_obj->wait_fd; | |
176 | ret = lttcomm_send_fds_unix_sock(sock, fds, 2); | |
177 | if (ret < 0) { | |
178 | perror("send consumer stream"); | |
179 | goto error; | |
180 | } | |
181 | } | |
182 | ||
183 | /* Send each channel fd streams of session */ | |
184 | rcu_read_lock(); | |
185 | hashtable_get_first(usess->channels, &iter); | |
186 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { | |
187 | uchan = caa_container_of(node, struct ust_app_channel, node); | |
188 | ||
6df2e2c9 MD |
189 | ret = send_channel_streams(sock, uchan, usess->uid, |
190 | usess->gid); | |
48842b30 | 191 | if (ret < 0) { |
5485f822 | 192 | rcu_read_unlock(); |
48842b30 DG |
193 | goto error; |
194 | } | |
195 | hashtable_get_next(usess->channels, &iter); | |
196 | } | |
197 | rcu_read_unlock(); | |
198 | ||
199 | DBG("consumer fds (metadata and channel streams) sent"); | |
200 | ||
201 | return 0; | |
202 | ||
203 | error: | |
204 | return ret; | |
205 | } |