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