Commit | Line | Data |
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54d01ffb 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 | #include <unistd.h> | |
19 | ||
20 | #include <lttng/lttng.h> | |
21 | #include <lttng-sessiond-comm.h> | |
22 | #include <lttngerr.h> | |
23 | ||
24 | #include "channel.h" | |
25 | #include "kernel-ctl.h" | |
44d3bd01 | 26 | #include "ust-ctl.h" |
54d01ffb DG |
27 | #include "utils.h" |
28 | ||
29 | /* | |
30 | * Return allocated channel attributes. | |
31 | */ | |
44d3bd01 | 32 | static struct lttng_channel *init_default_attr(int dom) |
54d01ffb DG |
33 | { |
34 | struct lttng_channel *chan; | |
35 | ||
36 | chan = zmalloc(sizeof(struct lttng_channel)); | |
37 | if (chan == NULL) { | |
38 | perror("malloc channel init"); | |
39 | goto error_alloc; | |
40 | } | |
41 | ||
44d3bd01 DG |
42 | if (snprintf(chan->name, sizeof(chan->name), "%s", |
43 | DEFAULT_CHANNEL_NAME) < 0) { | |
44 | perror("snprintf default channel name"); | |
54d01ffb DG |
45 | goto error; |
46 | } | |
47 | ||
48 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
49 | chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; | |
50 | chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; | |
51 | ||
52 | switch (dom) { | |
53 | case LTTNG_DOMAIN_KERNEL: | |
54 | chan->attr.subbuf_size = DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE; | |
55 | chan->attr.num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; | |
56 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
57 | break; | |
44d3bd01 DG |
58 | case LTTNG_DOMAIN_UST_PID: |
59 | chan->attr.subbuf_size = DEFAULT_UST_CHANNEL_SUBBUF_SIZE; | |
60 | chan->attr.num_subbuf = DEFAULT_UST_CHANNEL_SUBBUF_NUM; | |
61 | chan->attr.output = DEFAULT_UST_CHANNEL_OUTPUT; | |
62 | break; | |
54d01ffb DG |
63 | default: |
64 | goto error; /* Not implemented */ | |
65 | } | |
66 | ||
67 | return chan; | |
68 | ||
69 | error: | |
70 | free(chan); | |
71 | error_alloc: | |
72 | return NULL; | |
73 | } | |
74 | ||
75 | /* | |
76 | * Disable kernel channel of the kernel session. | |
77 | */ | |
78 | int channel_kernel_disable(struct ltt_kernel_session *ksession, | |
79 | char *channel_name) | |
80 | { | |
81 | int ret; | |
82 | struct ltt_kernel_channel *kchan; | |
83 | ||
84 | kchan = trace_kernel_get_channel_by_name(channel_name, ksession); | |
85 | if (kchan == NULL) { | |
86 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
87 | goto error; | |
88 | } else if (kchan->enabled == 1) { | |
89 | ret = kernel_disable_channel(kchan); | |
90 | if (ret < 0) { | |
91 | if (ret != EEXIST) { | |
92 | ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL; | |
93 | } | |
94 | goto error; | |
95 | } | |
96 | } | |
97 | ||
98 | ret = LTTCOMM_OK; | |
99 | ||
100 | error: | |
101 | return ret; | |
102 | } | |
103 | ||
104 | /* | |
105 | * Enable kernel channel of the kernel session. | |
106 | */ | |
107 | int channel_kernel_enable(struct ltt_kernel_session *ksession, | |
108 | struct ltt_kernel_channel *kchan) | |
109 | { | |
110 | int ret; | |
111 | ||
112 | if (kchan->enabled == 0) { | |
113 | ret = kernel_enable_channel(kchan); | |
114 | if (ret < 0) { | |
115 | ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL; | |
116 | goto error; | |
117 | } | |
118 | } | |
119 | ||
120 | ret = LTTCOMM_OK; | |
121 | ||
122 | error: | |
123 | return ret; | |
124 | } | |
125 | ||
126 | /* | |
127 | * Create kernel channel of the kernel session and notify kernel thread. | |
128 | */ | |
129 | int channel_kernel_create(struct ltt_kernel_session *ksession, | |
44d3bd01 | 130 | struct lttng_channel *chan, int kernel_pipe) |
54d01ffb DG |
131 | { |
132 | int ret; | |
133 | struct lttng_channel *attr = chan; | |
134 | ||
135 | /* Creating channel attributes if needed */ | |
136 | if (attr == NULL) { | |
44d3bd01 | 137 | attr = init_default_attr(LTTNG_DOMAIN_KERNEL); |
54d01ffb DG |
138 | if (attr == NULL) { |
139 | ret = LTTCOMM_FATAL; | |
140 | goto error; | |
141 | } | |
142 | } | |
143 | ||
144 | /* Channel not found, creating it */ | |
145 | ret = kernel_create_channel(ksession, attr, ksession->trace_path); | |
146 | if (ret < 0) { | |
147 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
148 | goto error; | |
149 | } | |
150 | ||
151 | /* Notify kernel thread that there is a new channel */ | |
152 | ret = notify_thread_pipe(kernel_pipe); | |
153 | if (ret < 0) { | |
154 | ret = LTTCOMM_FATAL; | |
155 | goto error; | |
156 | } | |
157 | ||
158 | ret = LTTCOMM_OK; | |
159 | ||
160 | error: | |
161 | return ret; | |
162 | } | |
44d3bd01 DG |
163 | |
164 | /* | |
165 | * Create UST channel and enable it on the tracer. | |
166 | */ | |
167 | int channel_ust_create(struct ltt_ust_session *usession, | |
168 | struct lttng_channel *chan, int sock) | |
169 | { | |
170 | int ret; | |
171 | struct lttng_channel *attr = chan; | |
172 | ||
173 | /* Creating channel attributes if needed */ | |
174 | if (attr == NULL) { | |
175 | attr = init_default_attr(LTTNG_DOMAIN_UST_PID); | |
176 | if (attr == NULL) { | |
177 | ret = LTTCOMM_FATAL; | |
178 | goto error; | |
179 | } | |
180 | } | |
181 | ||
182 | ret = ustctl_create_channel(sock, usession, attr); | |
183 | if (ret < 0) { | |
184 | ret = LTTCOMM_UST_CHAN_FAIL; | |
185 | goto error; | |
186 | } | |
187 | ||
188 | DBG2("Channel %s UST create successfully for sock:%d", attr->name, sock); | |
189 | ||
190 | ret = LTTCOMM_OK; | |
191 | ||
192 | error: | |
193 | return ret; | |
194 | } | |
195 | ||
196 | /* | |
197 | * Enable UST channel on the tracer. | |
198 | */ | |
199 | int channel_ust_enable(struct ltt_ust_session *usession, | |
200 | struct ltt_ust_channel *uchan, int sock) | |
201 | { | |
202 | int ret; | |
203 | ret = LTTCOMM_OK; | |
204 | ||
205 | ret = ustctl_enable_channel(sock, usession, uchan); | |
206 | if (ret < 0) { | |
207 | ret = LTTCOMM_UST_CHAN_FAIL; | |
208 | goto error; | |
209 | } | |
210 | ||
211 | ret = LTTCOMM_OK; | |
212 | ||
213 | error: | |
214 | return ret; | |
215 | } | |
216 | ||
217 | /* | |
218 | * Disable UST channel on the tracer. | |
219 | */ | |
220 | int channel_ust_disable(struct ltt_ust_session *usession, | |
221 | struct ltt_ust_channel *uchan, int sock) | |
222 | { | |
223 | int ret; | |
224 | ret = LTTCOMM_OK; | |
225 | ||
226 | ret = ustctl_disable_channel(sock, usession, uchan); | |
227 | if (ret < 0) { | |
228 | ret = LTTCOMM_UST_CHAN_FAIL; | |
229 | goto error; | |
230 | } | |
231 | ||
232 | ret = LTTCOMM_OK; | |
233 | ||
234 | error: | |
235 | return ret; | |
236 | } |