Fix link to git repository
[lttng-tools.git] / lttng-sessiond / ust-ctl.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; only version 2
7 * of the License.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19 #define _GNU_SOURCE
20 #include <stdlib.h>
21 #include <stdio.h>
22 #include <string.h>
23 #include <unistd.h>
24
25 #include <lttng-sessiond-comm.h>
26 #include <lttngerr.h>
27
28 #include "ust-comm.h"
29 #include "ust-ctl.h"
30 #include "../hashtable/hash.h"
31
32 /*
33 * Init command for tracer with cmd type and correct handle.
34 */
35 static void init_command(int cmd, int handle, struct lttcomm_ust_msg *command)
36 {
37 memset(command, 0, sizeof(struct lttcomm_ust_msg));
38
39 command->cmd = cmd;
40 command->handle = handle;
41 }
42
43 /*
44 * Generic send command to ust tracer. Caller must free reply.
45 */
46 static struct lttcomm_ust_reply *send_command(int sock,
47 struct lttcomm_ust_msg *command)
48 {
49 struct lttcomm_ust_reply *reply;
50
51 reply = ustcomm_send_command(sock, command);
52 if (reply == NULL) {
53 goto error;
54 }
55
56 if (reply->ret_code != LTTCOMM_OK) {
57 ERR("Return code (%d): %s", reply->ret_code,
58 lttcomm_get_readable_code(reply->ret_code));
59 goto error;
60 }
61
62 return reply;
63
64 error:
65 return NULL;
66 }
67
68 /*
69 * Send registration done packet to the application.
70 */
71 int ustctl_register_done(int sock)
72 {
73 struct lttcomm_ust_msg command;
74 struct lttcomm_ust_reply *reply;
75
76 DBG("Sending register done command to %d", sock);
77
78 command.cmd = LTTNG_UST_REGISTER_DONE;
79 command.handle = LTTNG_UST_ROOT_HANDLE;
80
81 reply = ustcomm_send_command(sock, &command);
82 if (reply == NULL) {
83 goto error;
84 }
85
86 if (reply->ret_code != LTTCOMM_OK) {
87 DBG("Return code: %s", lttcomm_get_readable_code(reply->ret_code));
88 goto error;
89 }
90
91 return 0;
92
93 error:
94 return -1;
95 }
96
97 /*
98 * Create an UST session on the tracer.
99 *
100 * Return handle if success else negative value.
101 */
102 int ustctl_create_session(int sock, struct ltt_ust_session *session)
103 {
104 int ret;
105 struct lttcomm_ust_msg command;
106 struct lttcomm_ust_reply *reply = NULL;
107
108 command.cmd = LTTNG_UST_SESSION;
109 command.handle = LTTNG_UST_ROOT_HANDLE;
110
111 reply = ustcomm_send_command(sock, &command);
112 if (reply == NULL) {
113 goto error;
114 }
115
116 /* Save session handle */
117 ret = reply->ret_val;
118 free(reply);
119
120 DBG2("ustctl create session command successful with handle %d", ret);
121
122 return ret;
123
124 error:
125 free(reply);
126 return -1;
127 }
128
129 /*
130 * Create UST channel to the tracer.
131 *
132 * Return handle if success else negative value.
133 */
134 int ustctl_create_channel(int sock, struct ltt_ust_session *session,
135 struct lttng_ust_channel *channel)
136 {
137 int ret;
138 struct lttcomm_ust_msg command;
139 struct lttcomm_ust_reply *reply = NULL;
140
141 init_command(LTTNG_UST_CHANNEL, session->handle, &command);
142 /* Copy channel attributes to command */
143 memcpy(&command.u.channel, channel, sizeof(command.u.channel));
144
145 /* Send command to tracer */
146 reply = send_command(sock, &command);
147 if (reply == NULL) {
148 goto error;
149 }
150
151 ret = reply->ret_val;
152 free(reply);
153
154 return ret;
155
156 error:
157 free(reply);
158 return -1;
159 }
160
161 /*
162 * Enable UST channel.
163 */
164 int ustctl_enable_channel(int sock, struct ltt_ust_session *session,
165 struct ltt_ust_channel *chan)
166 {
167 struct lttcomm_ust_msg command;
168 struct lttcomm_ust_reply *reply = NULL;
169
170 init_command(LTTNG_UST_ENABLE, chan->handle, &command);
171
172 reply = ustcomm_send_command(sock, &command);
173 if (reply == NULL) {
174 goto error;
175 }
176
177 if (reply->handle != chan->handle) {
178 ERR("Receive wrong handle from UST reply on enable channel");
179 goto error;
180 }
181
182 chan->enabled = 1;
183 free(reply);
184
185 DBG2("ustctl enable channel successful for sock %d", sock);
186 return 0;
187
188 error:
189 free(reply);
190 return -1;
191 }
192
193 /*
194 * Disable UST channel.
195 */
196 int ustctl_disable_channel(int sock, struct ltt_ust_session *session,
197 struct ltt_ust_channel *chan)
198 {
199 struct lttcomm_ust_msg command;
200 struct lttcomm_ust_reply *reply = NULL;
201
202 memset(&command, 0, sizeof(command));
203
204 command.cmd = LTTNG_UST_DISABLE;
205 command.handle = chan->handle;
206
207 reply = ustcomm_send_command(sock, &command);
208 if (reply == NULL) {
209 goto error;
210 }
211
212 if (reply->handle != chan->handle) {
213 ERR("Receive wrong handle from UST reply on enable channel");
214 goto error;
215 }
216
217 chan->enabled = 1;
218 free(reply);
219
220 DBG2("ustctl disable channel successful for sock %d", sock);
221 return 0;
222
223 error:
224 free(reply);
225 return -1;
226 }
This page took 0.033973 seconds and 4 git commands to generate.