Fix wording in lttng cli usage
[lttng-tools.git] / src / bin / lttng / commands / enable_channels.c
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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
c399183f 29#include "../command.h"
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30
31static char *opt_channels;
5edd7e09 32static int opt_kernel;
5440dc42 33static char *opt_session_name;
d36b8583 34static int opt_userspace;
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35static struct lttng_channel chan;
36#if 0
37/* Not implemented yet */
eeac7d46 38static char *opt_cmd_name;
d36b8583 39static pid_t opt_pid;
d78d6610 40#endif
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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,
d36b8583 50 OPT_USERSPACE,
679b4943 51 OPT_LIST_OPTIONS,
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52};
53
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54static struct lttng_handle *handle;
55
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56static struct poptOption long_options[] = {
57 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
58 {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
5440dc42 59 {"session", 's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
d36b8583 60 {"kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
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61#if 0
62 /* Not implemented yet */
6caa2bcc 63 {"userspace", 'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, &opt_cmd_name, OPT_USERSPACE, 0, 0},
d36b8583 64 {"pid", 'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
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65#else
66 {"userspace", 'u', POPT_ARG_NONE, 0, OPT_USERSPACE, 0, 0},
67#endif
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68 {"discard", 0, POPT_ARG_NONE, 0, OPT_DISCARD, 0, 0},
69 {"overwrite", 0, POPT_ARG_NONE, 0, OPT_OVERWRITE, 0, 0},
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70 {"subbuf-size", 0, POPT_ARG_DOUBLE, 0, OPT_SUBBUF_SIZE, 0, 0},
71 {"num-subbuf", 0, POPT_ARG_INT, 0, OPT_NUM_SUBBUF, 0, 0},
72 {"switch-timer", 0, POPT_ARG_INT, 0, OPT_SWITCH_TIMER, 0, 0},
73 {"read-timer", 0, POPT_ARG_INT, 0, OPT_READ_TIMER, 0, 0},
679b4943 74 {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
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75 {0, 0, 0, 0, 0, 0, 0}
76};
77
78/*
79 * usage
80 */
81static void usage(FILE *ofp)
82{
7d29a247 83 fprintf(ofp, "usage: lttng enable-channel NAME[,NAME2,...] [options] [channel_options]\n");
d36b8583 84 fprintf(ofp, "\n");
7d29a247 85 fprintf(ofp, " -h, --help Show this help\n");
679b4943 86 fprintf(ofp, " --list-options Simple listing of options\n");
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87 fprintf(ofp, " -s, --session Apply to session name\n");
88 fprintf(ofp, " -k, --kernel Apply to the kernel tracer\n");
d78d6610 89#if 0
27221701 90 fprintf(ofp, " -u, --userspace [CMD] Apply to the user-space tracer\n");
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91 fprintf(ofp, " If no CMD, the domain used is UST global\n");
92 fprintf(ofp, " or else the domain is UST EXEC_NAME\n");
93 fprintf(ofp, " -p, --pid PID If -u, apply to specific PID (domain: UST PID)\n");
d78d6610 94#else
27221701 95 fprintf(ofp, " -u, --userspace Apply to the user-space tracer\n");
d78d6610 96#endif
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97 fprintf(ofp, "\n");
98 fprintf(ofp, "Channel options:\n");
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99 fprintf(ofp, " --discard Discard event when buffers are full%s\n",
100 DEFAULT_CHANNEL_OVERWRITE ? "" : " (default)");
101 fprintf(ofp, " --overwrite Flight recorder mode%s\n",
102 DEFAULT_CHANNEL_OVERWRITE ? " (default)" : "");
cc62c0c0 103 fprintf(ofp, " --subbuf-size SIZE Subbuffer size in bytes\n");
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104 fprintf(ofp, " (default: %u, kernel default: %u)\n",
105 DEFAULT_CHANNEL_SUBBUF_SIZE,
106 DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE);
cc62c0c0 107 fprintf(ofp, " --num-subbuf NUM Number of subbufers\n");
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108 fprintf(ofp, " (default: %u, kernel default: %u)\n",
109 DEFAULT_CHANNEL_SUBBUF_NUM,
110 DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM);
cc62c0c0 111 fprintf(ofp, " --switch-timer USEC Switch timer interval in usec (default: %u)\n",
cabd9892 112 DEFAULT_CHANNEL_SWITCH_TIMER);
cc62c0c0 113 fprintf(ofp, " --read-timer USEC Read timer interval in usec (default: %u)\n",
cabd9892 114 DEFAULT_CHANNEL_READ_TIMER);
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115 fprintf(ofp, "\n");
116}
117
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118/*
119 * Set default attributes depending on those already defined from the command
120 * line.
121 */
122static void set_default_attr(struct lttng_domain *dom)
123{
124 struct lttng_channel_attr default_attr;
125
126 /* Set attributes */
127 lttng_channel_set_default_attr(dom, &default_attr);
128
129 if (chan.attr.overwrite == -1) {
130 chan.attr.overwrite = default_attr.overwrite;
131 }
132 if (chan.attr.subbuf_size == -1) {
133 chan.attr.subbuf_size = default_attr.subbuf_size;
134 }
135 if (chan.attr.num_subbuf == -1) {
136 chan.attr.num_subbuf = default_attr.num_subbuf;
137 }
138 if (chan.attr.switch_timer_interval == -1) {
139 chan.attr.switch_timer_interval = default_attr.switch_timer_interval;
140 }
141 if (chan.attr.read_timer_interval == -1) {
142 chan.attr.read_timer_interval = default_attr.read_timer_interval;
143 }
144 if (chan.attr.output == -1) {
145 chan.attr.output = default_attr.output;
146 }
147}
148
d36b8583 149/*
0fdd1e2c 150 * Adding channel using the lttng API.
d36b8583 151 */
cd80958d 152static int enable_channel(char *session_name)
d36b8583 153{
ae856491 154 int ret = CMD_SUCCESS, warn = 0;
d36b8583 155 char *channel_name;
7d29a247 156 struct lttng_domain dom;
d36b8583 157
d78d6610 158 /* Create lttng domain */
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159 if (opt_kernel) {
160 dom.type = LTTNG_DOMAIN_KERNEL;
d78d6610 161 } else if (opt_userspace) {
f6a9efaa 162 dom.type = LTTNG_DOMAIN_UST;
0fdd1e2c 163 } else {
e14f64a8 164 ERR("Please specify a tracer (-k/--kernel or -u/--userspace)");
d16c1a4c 165 ret = CMD_ERROR;
0fdd1e2c 166 goto error;
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167 }
168
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169 set_default_attr(&dom);
170
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171 handle = lttng_create_handle(session_name, &dom);
172 if (handle == NULL) {
173 ret = -1;
174 goto error;
175 }
176
0fdd1e2c 177 /* Strip channel list (format: chan1,chan2,...) */
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178 channel_name = strtok(opt_channels, ",");
179 while (channel_name != NULL) {
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180 /* Copy channel name and normalize it */
181 strncpy(chan.name, channel_name, NAME_MAX);
182 chan.name[NAME_MAX - 1] = '\0';
183
184 DBG("Enabling channel %s", channel_name);
185
186 ret = lttng_enable_channel(handle, &chan);
187 if (ret < 0) {
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188 ERR("Channel %s: %s (session %s)", channel_name,
189 lttng_strerror(ret), session_name);
190 warn = 1;
d36b8583 191 } else {
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192 MSG("%s channel %s enabled for session %s",
193 opt_kernel ? "Kernel" : "UST", channel_name,
194 session_name);
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195 }
196
197 /* Next event */
198 channel_name = strtok(NULL, ",");
199 }
200
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201 ret = CMD_SUCCESS;
202
d36b8583 203error:
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204 if (warn) {
205 ret = CMD_WARNING;
206 }
207
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208 lttng_destroy_handle(handle);
209
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210 return ret;
211}
212
213/*
0fdd1e2c 214 * Default value for channel configuration.
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215 */
216static void init_channel_config(void)
217{
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218 /*
219 * Put -1 everywhere so we can identify those set by the command line and
220 * those needed to be set by the default values.
221 */
222 memset(&chan.attr, -1, sizeof(chan.attr));
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223}
224
225/*
0fdd1e2c 226 * Add channel to trace session
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227 */
228int cmd_enable_channels(int argc, const char **argv)
229{
ca1c3607 230 int opt, ret = CMD_SUCCESS;
d36b8583 231 static poptContext pc;
cd80958d 232 char *session_name = NULL;
d36b8583 233
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234 init_channel_config();
235
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236 pc = poptGetContext(NULL, argc, argv, long_options, 0);
237 poptReadDefaultConfig(pc, 0);
238
239 while ((opt = poptGetNextOpt(pc)) != -1) {
240 switch (opt) {
241 case OPT_HELP:
ca1c3607 242 usage(stdout);
d36b8583 243 goto end;
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244 case OPT_DISCARD:
245 chan.attr.overwrite = 0;
246 DBG("Channel set to discard");
247 break;
248 case OPT_OVERWRITE:
249 chan.attr.overwrite = 1;
250 DBG("Channel set to overwrite");
251 break;
252 case OPT_SUBBUF_SIZE:
ca1c3607 253 /* TODO Replace atol with strtol and check for errors */
7d29a247 254 chan.attr.subbuf_size = atol(poptGetOptArg(pc));
5a0de755 255 DBG("Channel subbuf size set to %" PRIu64, chan.attr.subbuf_size);
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256 break;
257 case OPT_NUM_SUBBUF:
ca1c3607 258 /* TODO Replace atoi with strtol and check for errors */
7d29a247 259 chan.attr.num_subbuf = atoi(poptGetOptArg(pc));
5a0de755 260 DBG("Channel subbuf num set to %" PRIu64, chan.attr.num_subbuf);
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261 break;
262 case OPT_SWITCH_TIMER:
ca1c3607 263 /* TODO Replace atoi with strtol and check for errors */
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264 chan.attr.switch_timer_interval = atoi(poptGetOptArg(pc));
265 DBG("Channel switch timer interval set to %d", chan.attr.switch_timer_interval);
266 break;
267 case OPT_READ_TIMER:
ca1c3607 268 /* TODO Replace atoi with strtol and check for errors */
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269 chan.attr.read_timer_interval = atoi(poptGetOptArg(pc));
270 DBG("Channel read timer interval set to %d", chan.attr.read_timer_interval);
d36b8583 271 break;
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272 case OPT_USERSPACE:
273 opt_userspace = 1;
eeac7d46 274 break;
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275 case OPT_LIST_OPTIONS:
276 list_cmd_options(stdout, long_options);
679b4943 277 goto end;
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278 default:
279 usage(stderr);
280 ret = CMD_UNDEFINED;
281 goto end;
282 }
283 }
284
285 opt_channels = (char*) poptGetArg(pc);
286 if (opt_channels == NULL) {
7d29a247 287 ERR("Missing channel name.\n");
d36b8583 288 usage(stderr);
ca1c3607 289 ret = CMD_ERROR;
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290 goto end;
291 }
292
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293 if (!opt_session_name) {
294 session_name = get_session_name();
295 if (session_name == NULL) {
ca1c3607 296 ret = CMD_ERROR;
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297 goto end;
298 }
299 } else {
300 session_name = opt_session_name;
301 }
302
303 ret = enable_channel(session_name);
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304
305end:
ca1c3607 306 poptFreeContext(pc);
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307 return ret;
308}
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