Fix enable-channel that did not handle correctly lttng domains
[lttng-tools.git] / lttng / commands / enable_channels.c
CommitLineData
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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
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6 * as published by the Free Software Foundation; only version 2
7 * of the License.
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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 <popt.h>
21#include <stdio.h>
22#include <stdlib.h>
23#include <string.h>
24#include <sys/stat.h>
25#include <sys/types.h>
26#include <unistd.h>
5a0de755 27#include <inttypes.h>
d36b8583 28
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29#include "../cmd.h"
30#include "../conf.h"
31#include "../utils.h"
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32
33static char *opt_channels;
34static char *opt_kernel;
7d29a247 35static char *opt_cmd_name;
5440dc42 36static char *opt_session_name;
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37static int opt_pid_all;
38static int opt_userspace;
39static pid_t opt_pid;
7d29a247 40static struct lttng_channel chan;
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41
42enum {
43 OPT_HELP = 1,
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44 OPT_DISCARD,
45 OPT_OVERWRITE,
46 OPT_SUBBUF_SIZE,
47 OPT_NUM_SUBBUF,
48 OPT_SWITCH_TIMER,
49 OPT_READ_TIMER,
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50 OPT_USERSPACE,
51};
52
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53static struct lttng_handle *handle;
54
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55static struct poptOption long_options[] = {
56 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
57 {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
5440dc42 58 {"session", 's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
d36b8583 59 {"kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
7d29a247 60 {"userspace", 'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, 0, OPT_USERSPACE, 0, 0},
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61 {"all", 0, POPT_ARG_VAL, &opt_pid_all, 1, 0, 0},
62 {"pid", 'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
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63 {"discard", 0, POPT_ARG_NONE, 0, OPT_DISCARD, 0, 0},
64 {"overwrite", 0, POPT_ARG_NONE, 0, OPT_OVERWRITE, 0, 0},
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65 {"subbuf-size", 0, POPT_ARG_DOUBLE, 0, OPT_SUBBUF_SIZE, 0, 0},
66 {"num-subbuf", 0, POPT_ARG_INT, 0, OPT_NUM_SUBBUF, 0, 0},
67 {"switch-timer", 0, POPT_ARG_INT, 0, OPT_SWITCH_TIMER, 0, 0},
68 {"read-timer", 0, POPT_ARG_INT, 0, OPT_READ_TIMER, 0, 0},
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69 {0, 0, 0, 0, 0, 0, 0}
70};
71
72/*
73 * usage
74 */
75static void usage(FILE *ofp)
76{
7d29a247 77 fprintf(ofp, "usage: lttng enable-channel NAME[,NAME2,...] [options] [channel_options]\n");
d36b8583 78 fprintf(ofp, "\n");
7d29a247 79 fprintf(ofp, " -h, --help Show this help\n");
5440dc42 80 fprintf(ofp, " -s, --session Apply on session name\n");
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81 fprintf(ofp, " -k, --kernel Apply on the kernel tracer\n");
82 fprintf(ofp, " -u, --userspace [CMD] Apply on the user-space tracer\n");
83 fprintf(ofp, " --all If -u, apply on all traceable apps\n");
84 fprintf(ofp, " -p, --pid PID If -u, apply on a specific PID\n");
85 fprintf(ofp, "\n");
86 fprintf(ofp, "Channel options:\n");
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87 fprintf(ofp, " --discard Discard event when buffers are full%s\n",
88 DEFAULT_CHANNEL_OVERWRITE ? "" : " (default)");
89 fprintf(ofp, " --overwrite Flight recorder mode%s\n",
90 DEFAULT_CHANNEL_OVERWRITE ? " (default)" : "");
91 fprintf(ofp, " --subbuf-size Subbuffer size in bytes\n");
92 fprintf(ofp, " (default: %u, kernel default: %u)\n",
93 DEFAULT_CHANNEL_SUBBUF_SIZE,
94 DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE);
95 fprintf(ofp, " --num-subbuf Number of subbufers\n");
96 fprintf(ofp, " (default: %u, kernel default: %u)\n",
97 DEFAULT_CHANNEL_SUBBUF_NUM,
98 DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM);
99 fprintf(ofp, " --switch-timer Switch timer interval in usec (default: %u)\n",
100 DEFAULT_CHANNEL_SWITCH_TIMER);
101 fprintf(ofp, " --read-timer Read timer interval in usec (default: %u)\n",
102 DEFAULT_CHANNEL_READ_TIMER);
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103 fprintf(ofp, "\n");
104}
105
106/*
0fdd1e2c 107 * Adding channel using the lttng API.
d36b8583 108 */
cd80958d 109static int enable_channel(char *session_name)
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110{
111 int ret = CMD_SUCCESS;
112 char *channel_name;
7d29a247 113 struct lttng_domain dom;
d36b8583 114
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115 if (opt_kernel) {
116 dom.type = LTTNG_DOMAIN_KERNEL;
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117 } else if (opt_pid != 0) {
118 dom.type = LTTNG_DOMAIN_UST_PID;
119 dom.attr.pid = opt_pid;
120 DBG("PID %d set to lttng handle", opt_pid);
121 } else {
a881057e 122 ERR("Please specify a tracer (--kernel or --userspace)");
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123 ret = CMD_NOT_IMPLEMENTED;
124 goto error;
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125 }
126
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127 handle = lttng_create_handle(session_name, &dom);
128 if (handle == NULL) {
129 ret = -1;
130 goto error;
131 }
132
0fdd1e2c 133 /* Strip channel list (format: chan1,chan2,...) */
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134 channel_name = strtok(opt_channels, ",");
135 while (channel_name != NULL) {
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136 /* Copy channel name and normalize it */
137 strncpy(chan.name, channel_name, NAME_MAX);
138 chan.name[NAME_MAX - 1] = '\0';
139
140 DBG("Enabling channel %s", channel_name);
141
142 ret = lttng_enable_channel(handle, &chan);
143 if (ret < 0) {
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144 goto error;
145 } else {
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146 MSG("Channel enabled %s for session %s",
147 channel_name, session_name);
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148 }
149
150 /* Next event */
151 channel_name = strtok(NULL, ",");
152 }
153
154error:
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155 lttng_destroy_handle(handle);
156
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157 return ret;
158}
159
160/*
0fdd1e2c 161 * Default value for channel configuration.
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162 */
163static void init_channel_config(void)
164{
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165 if (opt_kernel) {
166 /* kernel default */
167 chan.attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
168 chan.attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
169 chan.attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
170
171 chan.attr.subbuf_size = DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE;
172 chan.attr.num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
173 chan.attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
174 } else {
175 /* default behavior, used by UST. */
176 chan.attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
177 chan.attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
178 chan.attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
179
180 chan.attr.subbuf_size = DEFAULT_CHANNEL_SUBBUF_SIZE;
181 chan.attr.num_subbuf = DEFAULT_CHANNEL_SUBBUF_NUM;
182 chan.attr.output = DEFAULT_CHANNEL_OUTPUT;
183 }
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184}
185
186/*
0fdd1e2c 187 * Add channel to trace session
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188 */
189int cmd_enable_channels(int argc, const char **argv)
190{
191 int opt, ret;
192 static poptContext pc;
cd80958d 193 char *session_name = NULL;
d36b8583 194
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195 init_channel_config();
196
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197 pc = poptGetContext(NULL, argc, argv, long_options, 0);
198 poptReadDefaultConfig(pc, 0);
199
200 while ((opt = poptGetNextOpt(pc)) != -1) {
201 switch (opt) {
202 case OPT_HELP:
203 usage(stderr);
204 ret = CMD_SUCCESS;
205 goto end;
206 case OPT_USERSPACE:
207 opt_userspace = 1;
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208 opt_cmd_name = poptGetOptArg(pc);
209 break;
210 case OPT_DISCARD:
211 chan.attr.overwrite = 0;
212 DBG("Channel set to discard");
213 break;
214 case OPT_OVERWRITE:
215 chan.attr.overwrite = 1;
216 DBG("Channel set to overwrite");
217 break;
218 case OPT_SUBBUF_SIZE:
219 chan.attr.subbuf_size = atol(poptGetOptArg(pc));
5a0de755 220 DBG("Channel subbuf size set to %" PRIu64, chan.attr.subbuf_size);
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221 break;
222 case OPT_NUM_SUBBUF:
223 chan.attr.num_subbuf = atoi(poptGetOptArg(pc));
5a0de755 224 DBG("Channel subbuf num set to %" PRIu64, chan.attr.num_subbuf);
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225 break;
226 case OPT_SWITCH_TIMER:
227 chan.attr.switch_timer_interval = atoi(poptGetOptArg(pc));
228 DBG("Channel switch timer interval set to %d", chan.attr.switch_timer_interval);
229 break;
230 case OPT_READ_TIMER:
231 chan.attr.read_timer_interval = atoi(poptGetOptArg(pc));
232 DBG("Channel read timer interval set to %d", chan.attr.read_timer_interval);
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233 break;
234 default:
235 usage(stderr);
236 ret = CMD_UNDEFINED;
237 goto end;
238 }
239 }
240
241 opt_channels = (char*) poptGetArg(pc);
242 if (opt_channels == NULL) {
7d29a247 243 ERR("Missing channel name.\n");
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244 usage(stderr);
245 ret = CMD_SUCCESS;
246 goto end;
247 }
248
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249 if (!opt_session_name) {
250 session_name = get_session_name();
251 if (session_name == NULL) {
252 ret = -1;
253 goto end;
254 }
255 } else {
256 session_name = opt_session_name;
257 }
258
259 ret = enable_channel(session_name);
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260
261end:
262 return ret;
263}
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