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f1e16794 DG |
1 | /* |
2 | * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com> | |
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, version 2 only, as | |
6 | * published by the Free Software Foundation. | |
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., 51 | |
15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
18 | #define _GNU_SOURCE | |
19 | #include <stdio.h> | |
20 | #include <stdlib.h> | |
21 | #include <string.h> | |
22 | #include <sys/stat.h> | |
23 | #include <unistd.h> | |
24 | ||
25 | #include <common/common.h> | |
26 | #include <common/defaults.h> | |
27 | #include <common/sessiond-comm/sessiond-comm.h> | |
28 | ||
29 | #include "kernel-consumer.h" | |
30 | ||
31 | /* | |
32 | * Send all stream fds of kernel channel to the consumer. | |
33 | */ | |
34 | int kernel_consumer_send_channel_stream(struct consumer_data *consumer_data, | |
35 | int sock, struct ltt_kernel_channel *channel, uid_t uid, gid_t gid) | |
36 | { | |
37 | int ret, count = 0; | |
38 | struct ltt_kernel_stream *stream; | |
39 | struct lttcomm_consumer_msg lkm; | |
40 | ||
41 | DBG("Sending streams of channel %s to kernel consumer", | |
42 | channel->channel->name); | |
43 | ||
44 | /* Send channel */ | |
45 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
46 | lkm.u.channel.channel_key = channel->fd; | |
47 | lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size; | |
48 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
49 | DBG("Sending channel %d to consumer", lkm.u.channel.channel_key); | |
50 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
51 | if (ret < 0) { | |
52 | PERROR("send consumer channel"); | |
53 | goto error; | |
54 | } | |
55 | ||
56 | /* Send streams */ | |
57 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { | |
58 | if (!stream->fd) { | |
59 | continue; | |
60 | } | |
61 | /* Reset consumer message structure */ | |
62 | memset(&lkm, 0, sizeof(lkm)); | |
63 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
64 | lkm.u.stream.channel_key = channel->fd; | |
65 | lkm.u.stream.stream_key = stream->fd; | |
66 | lkm.u.stream.state = stream->state; | |
67 | lkm.u.stream.output = channel->channel->attr.output; | |
68 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
69 | lkm.u.stream.uid = uid; | |
70 | lkm.u.stream.gid = gid; | |
71 | strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1); | |
72 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
73 | count++; | |
74 | ||
75 | DBG("Sending stream %d to consumer", lkm.u.stream.stream_key); | |
76 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
77 | if (ret < 0) { | |
78 | PERROR("send consumer stream"); | |
79 | goto error; | |
80 | } | |
81 | ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1); | |
82 | if (ret < 0) { | |
83 | PERROR("send consumer stream ancillary data"); | |
84 | goto error; | |
85 | } | |
86 | } | |
87 | ||
88 | DBG("consumer channel streams sent"); | |
89 | ||
90 | return 0; | |
91 | ||
92 | error: | |
93 | return ret; | |
94 | } | |
95 | ||
96 | /* | |
97 | * Send all stream fds of the kernel session to the consumer. | |
98 | */ | |
99 | int kernel_consumer_send_session(struct consumer_data *consumer_data, | |
100 | struct ltt_kernel_session *session) | |
101 | { | |
102 | int ret; | |
103 | struct ltt_kernel_channel *chan; | |
104 | struct lttcomm_consumer_msg lkm; | |
105 | int sock = session->consumer_fd; | |
106 | ||
107 | DBG("Sending metadata stream fd"); | |
108 | ||
109 | /* Extra protection. It's NOT supposed to be set to -1 at this point */ | |
110 | if (session->consumer_fd < 0) { | |
111 | session->consumer_fd = consumer_data->cmd_sock; | |
112 | } | |
113 | ||
114 | if (session->metadata_stream_fd >= 0) { | |
115 | /* Send metadata channel fd */ | |
116 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; | |
117 | lkm.u.channel.channel_key = session->metadata->fd; | |
118 | lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
119 | lkm.u.channel.mmap_len = 0; /* for kernel */ | |
120 | DBG("Sending metadata channel %d to consumer", lkm.u.channel.channel_key); | |
121 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
122 | if (ret < 0) { | |
123 | PERROR("send consumer channel"); | |
124 | goto error; | |
125 | } | |
126 | ||
127 | /* Send metadata stream fd */ | |
128 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; | |
129 | lkm.u.stream.channel_key = session->metadata->fd; | |
130 | lkm.u.stream.stream_key = session->metadata_stream_fd; | |
131 | lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; | |
132 | lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
133 | lkm.u.stream.mmap_len = 0; /* for kernel */ | |
134 | lkm.u.stream.uid = session->uid; | |
135 | lkm.u.stream.gid = session->gid; | |
136 | strncpy(lkm.u.stream.path_name, session->metadata->pathname, | |
137 | PATH_MAX - 1); | |
138 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; | |
139 | ||
140 | DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key); | |
141 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); | |
142 | if (ret < 0) { | |
143 | PERROR("send consumer stream"); | |
144 | goto error; | |
145 | } | |
146 | ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1); | |
147 | if (ret < 0) { | |
148 | PERROR("send consumer stream"); | |
149 | goto error; | |
150 | } | |
151 | } | |
152 | ||
153 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { | |
154 | ret = kernel_consumer_send_channel_stream(consumer_data, sock, chan, | |
155 | session->uid, session->gid); | |
156 | if (ret < 0) { | |
157 | goto error; | |
158 | } | |
159 | } | |
160 | ||
161 | DBG("consumer fds (metadata and channel streams) sent"); | |
162 | ||
163 | return 0; | |
164 | ||
165 | error: | |
166 | return ret; | |
167 | } | |
168 |