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 | ||
56fff090 | 18 | #include <string.h> |
54d01ffb DG |
19 | #include <unistd.h> |
20 | ||
21 | #include <lttng/lttng.h> | |
22 | #include <lttng-sessiond-comm.h> | |
23 | #include <lttngerr.h> | |
24 | ||
25 | #include "channel.h" | |
f6a9efaa | 26 | #include "hashtable.h" |
4771f025 | 27 | #include "kernel.h" |
44d3bd01 | 28 | #include "ust-ctl.h" |
54d01ffb DG |
29 | #include "utils.h" |
30 | ||
31 | /* | |
32 | * Return allocated channel attributes. | |
33 | */ | |
f6cd6b0f | 34 | struct lttng_channel *channel_new_default_attr(int dom) |
54d01ffb DG |
35 | { |
36 | struct lttng_channel *chan; | |
37 | ||
38 | chan = zmalloc(sizeof(struct lttng_channel)); | |
39 | if (chan == NULL) { | |
ba7f0ae5 | 40 | perror("zmalloc channel init"); |
54d01ffb DG |
41 | goto error_alloc; |
42 | } | |
43 | ||
44d3bd01 DG |
44 | if (snprintf(chan->name, sizeof(chan->name), "%s", |
45 | DEFAULT_CHANNEL_NAME) < 0) { | |
46 | perror("snprintf default channel name"); | |
54d01ffb DG |
47 | goto error; |
48 | } | |
49 | ||
50 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
51 | chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; | |
52 | chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; | |
53 | ||
54 | switch (dom) { | |
1b1c65fa MD |
55 | case LTTNG_DOMAIN_KERNEL: |
56 | chan->attr.subbuf_size = DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE; | |
57 | chan->attr.num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; | |
58 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
59 | break; | |
60 | case LTTNG_DOMAIN_UST: | |
61 | case LTTNG_DOMAIN_UST_PID: | |
62 | chan->attr.subbuf_size = DEFAULT_UST_CHANNEL_SUBBUF_SIZE; | |
63 | chan->attr.num_subbuf = DEFAULT_UST_CHANNEL_SUBBUF_NUM; | |
64 | chan->attr.output = DEFAULT_UST_CHANNEL_OUTPUT; | |
65 | break; | |
66 | default: | |
67 | goto error; /* Not implemented */ | |
54d01ffb DG |
68 | } |
69 | ||
70 | return chan; | |
71 | ||
72 | error: | |
73 | free(chan); | |
74 | error_alloc: | |
75 | return NULL; | |
76 | } | |
77 | ||
78 | /* | |
79 | * Disable kernel channel of the kernel session. | |
80 | */ | |
81 | int channel_kernel_disable(struct ltt_kernel_session *ksession, | |
82 | char *channel_name) | |
83 | { | |
84 | int ret; | |
85 | struct ltt_kernel_channel *kchan; | |
86 | ||
87 | kchan = trace_kernel_get_channel_by_name(channel_name, ksession); | |
88 | if (kchan == NULL) { | |
89 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
90 | goto error; | |
91 | } else if (kchan->enabled == 1) { | |
92 | ret = kernel_disable_channel(kchan); | |
93 | if (ret < 0) { | |
94 | if (ret != EEXIST) { | |
95 | ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL; | |
96 | } | |
97 | goto error; | |
98 | } | |
99 | } | |
100 | ||
101 | ret = LTTCOMM_OK; | |
102 | ||
103 | error: | |
104 | return ret; | |
105 | } | |
106 | ||
107 | /* | |
108 | * Enable kernel channel of the kernel session. | |
109 | */ | |
110 | int channel_kernel_enable(struct ltt_kernel_session *ksession, | |
111 | struct ltt_kernel_channel *kchan) | |
112 | { | |
113 | int ret; | |
114 | ||
115 | if (kchan->enabled == 0) { | |
116 | ret = kernel_enable_channel(kchan); | |
117 | if (ret < 0) { | |
118 | ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL; | |
119 | goto error; | |
120 | } | |
121 | } | |
122 | ||
123 | ret = LTTCOMM_OK; | |
124 | ||
125 | error: | |
126 | return ret; | |
127 | } | |
128 | ||
129 | /* | |
130 | * Create kernel channel of the kernel session and notify kernel thread. | |
131 | */ | |
132 | int channel_kernel_create(struct ltt_kernel_session *ksession, | |
ff4d74e6 | 133 | struct lttng_channel *attr, int kernel_pipe) |
54d01ffb DG |
134 | { |
135 | int ret; | |
ff4d74e6 | 136 | struct lttng_channel *defattr = NULL; |
54d01ffb DG |
137 | |
138 | /* Creating channel attributes if needed */ | |
139 | if (attr == NULL) { | |
ff4d74e6 MD |
140 | defattr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL); |
141 | if (defattr == NULL) { | |
54d01ffb DG |
142 | ret = LTTCOMM_FATAL; |
143 | goto error; | |
144 | } | |
ff4d74e6 | 145 | attr = defattr; |
54d01ffb DG |
146 | } |
147 | ||
148 | /* Channel not found, creating it */ | |
149 | ret = kernel_create_channel(ksession, attr, ksession->trace_path); | |
150 | if (ret < 0) { | |
151 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
152 | goto error; | |
153 | } | |
154 | ||
155 | /* Notify kernel thread that there is a new channel */ | |
156 | ret = notify_thread_pipe(kernel_pipe); | |
157 | if (ret < 0) { | |
158 | ret = LTTCOMM_FATAL; | |
159 | goto error; | |
160 | } | |
161 | ||
162 | ret = LTTCOMM_OK; | |
54d01ffb | 163 | error: |
ff4d74e6 | 164 | free(defattr); |
54d01ffb DG |
165 | return ret; |
166 | } |