Add new API call lttng_channel_set_default_attr
[lttng-tools.git] / 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
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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;
5edd7e09 34static int 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;
eeac7d46 39static char *opt_cmd_name;
d36b8583 40static pid_t opt_pid;
7d29a247 41static struct lttng_channel chan;
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42
43enum {
44 OPT_HELP = 1,
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45 OPT_DISCARD,
46 OPT_OVERWRITE,
47 OPT_SUBBUF_SIZE,
48 OPT_NUM_SUBBUF,
49 OPT_SWITCH_TIMER,
50 OPT_READ_TIMER,
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51 OPT_USERSPACE,
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},
6caa2bcc 61 {"userspace", 'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, &opt_cmd_name, OPT_USERSPACE, 0, 0},
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62 {"all", 0, POPT_ARG_VAL, &opt_pid_all, 1, 0, 0},
63 {"pid", 'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
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64 {"discard", 0, POPT_ARG_NONE, 0, OPT_DISCARD, 0, 0},
65 {"overwrite", 0, POPT_ARG_NONE, 0, OPT_OVERWRITE, 0, 0},
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66 {"subbuf-size", 0, POPT_ARG_DOUBLE, 0, OPT_SUBBUF_SIZE, 0, 0},
67 {"num-subbuf", 0, POPT_ARG_INT, 0, OPT_NUM_SUBBUF, 0, 0},
68 {"switch-timer", 0, POPT_ARG_INT, 0, OPT_SWITCH_TIMER, 0, 0},
69 {"read-timer", 0, POPT_ARG_INT, 0, OPT_READ_TIMER, 0, 0},
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70 {0, 0, 0, 0, 0, 0, 0}
71};
72
73/*
74 * usage
75 */
76static void usage(FILE *ofp)
77{
7d29a247 78 fprintf(ofp, "usage: lttng enable-channel NAME[,NAME2,...] [options] [channel_options]\n");
d36b8583 79 fprintf(ofp, "\n");
7d29a247 80 fprintf(ofp, " -h, --help Show this help\n");
5440dc42 81 fprintf(ofp, " -s, --session Apply on session name\n");
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82 fprintf(ofp, " -k, --kernel Apply on the kernel tracer\n");
83 fprintf(ofp, " -u, --userspace [CMD] Apply on the user-space tracer\n");
84 fprintf(ofp, " --all If -u, apply on all traceable apps\n");
85 fprintf(ofp, " -p, --pid PID If -u, apply on a specific PID\n");
86 fprintf(ofp, "\n");
87 fprintf(ofp, "Channel options:\n");
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88 fprintf(ofp, " --discard Discard event when buffers are full%s\n",
89 DEFAULT_CHANNEL_OVERWRITE ? "" : " (default)");
90 fprintf(ofp, " --overwrite Flight recorder mode%s\n",
91 DEFAULT_CHANNEL_OVERWRITE ? " (default)" : "");
92 fprintf(ofp, " --subbuf-size Subbuffer size in bytes\n");
93 fprintf(ofp, " (default: %u, kernel default: %u)\n",
94 DEFAULT_CHANNEL_SUBBUF_SIZE,
95 DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE);
96 fprintf(ofp, " --num-subbuf Number of subbufers\n");
97 fprintf(ofp, " (default: %u, kernel default: %u)\n",
98 DEFAULT_CHANNEL_SUBBUF_NUM,
99 DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM);
100 fprintf(ofp, " --switch-timer Switch timer interval in usec (default: %u)\n",
101 DEFAULT_CHANNEL_SWITCH_TIMER);
102 fprintf(ofp, " --read-timer Read timer interval in usec (default: %u)\n",
103 DEFAULT_CHANNEL_READ_TIMER);
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104 fprintf(ofp, "\n");
105}
106
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107/*
108 * Set default attributes depending on those already defined from the command
109 * line.
110 */
111static void set_default_attr(struct lttng_domain *dom)
112{
113 struct lttng_channel_attr default_attr;
114
115 /* Set attributes */
116 lttng_channel_set_default_attr(dom, &default_attr);
117
118 if (chan.attr.overwrite == -1) {
119 chan.attr.overwrite = default_attr.overwrite;
120 }
121 if (chan.attr.subbuf_size == -1) {
122 chan.attr.subbuf_size = default_attr.subbuf_size;
123 }
124 if (chan.attr.num_subbuf == -1) {
125 chan.attr.num_subbuf = default_attr.num_subbuf;
126 }
127 if (chan.attr.switch_timer_interval == -1) {
128 chan.attr.switch_timer_interval = default_attr.switch_timer_interval;
129 }
130 if (chan.attr.read_timer_interval == -1) {
131 chan.attr.read_timer_interval = default_attr.read_timer_interval;
132 }
133 if (chan.attr.output == -1) {
134 chan.attr.output = default_attr.output;
135 }
136}
137
d36b8583 138/*
0fdd1e2c 139 * Adding channel using the lttng API.
d36b8583 140 */
cd80958d 141static int enable_channel(char *session_name)
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142{
143 int ret = CMD_SUCCESS;
144 char *channel_name;
7d29a247 145 struct lttng_domain dom;
d36b8583 146
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147 if (opt_kernel) {
148 dom.type = LTTNG_DOMAIN_KERNEL;
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149 } else if (opt_pid != 0) {
150 dom.type = LTTNG_DOMAIN_UST_PID;
151 dom.attr.pid = opt_pid;
152 DBG("PID %d set to lttng handle", opt_pid);
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153 } else if (opt_userspace && opt_cmd_name == NULL) {
154 dom.type = LTTNG_DOMAIN_UST;
155 } else if (opt_userspace && opt_cmd_name != NULL) {
156 dom.type = LTTNG_DOMAIN_UST_EXEC_NAME;
157 strncpy(dom.attr.exec_name, opt_cmd_name, NAME_MAX);
0fdd1e2c 158 } else {
a881057e 159 ERR("Please specify a tracer (--kernel or --userspace)");
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160 ret = CMD_NOT_IMPLEMENTED;
161 goto error;
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162 }
163
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164 set_default_attr(&dom);
165
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166 handle = lttng_create_handle(session_name, &dom);
167 if (handle == NULL) {
168 ret = -1;
169 goto error;
170 }
171
0fdd1e2c 172 /* Strip channel list (format: chan1,chan2,...) */
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173 channel_name = strtok(opt_channels, ",");
174 while (channel_name != NULL) {
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175 /* Copy channel name and normalize it */
176 strncpy(chan.name, channel_name, NAME_MAX);
177 chan.name[NAME_MAX - 1] = '\0';
178
179 DBG("Enabling channel %s", channel_name);
180
181 ret = lttng_enable_channel(handle, &chan);
182 if (ret < 0) {
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183 goto error;
184 } else {
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185 MSG("Channel enabled %s for session %s",
186 channel_name, session_name);
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187 }
188
189 /* Next event */
190 channel_name = strtok(NULL, ",");
191 }
192
193error:
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194 lttng_destroy_handle(handle);
195
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196 return ret;
197}
198
199/*
0fdd1e2c 200 * Default value for channel configuration.
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201 */
202static void init_channel_config(void)
203{
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204 /*
205 * Put -1 everywhere so we can identify those set by the command line and
206 * those needed to be set by the default values.
207 */
208 memset(&chan.attr, -1, sizeof(chan.attr));
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209}
210
211/*
0fdd1e2c 212 * Add channel to trace session
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213 */
214int cmd_enable_channels(int argc, const char **argv)
215{
216 int opt, ret;
217 static poptContext pc;
cd80958d 218 char *session_name = NULL;
d36b8583 219
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220 init_channel_config();
221
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222 pc = poptGetContext(NULL, argc, argv, long_options, 0);
223 poptReadDefaultConfig(pc, 0);
224
225 while ((opt = poptGetNextOpt(pc)) != -1) {
226 switch (opt) {
227 case OPT_HELP:
228 usage(stderr);
229 ret = CMD_SUCCESS;
230 goto end;
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231 case OPT_DISCARD:
232 chan.attr.overwrite = 0;
233 DBG("Channel set to discard");
234 break;
235 case OPT_OVERWRITE:
236 chan.attr.overwrite = 1;
237 DBG("Channel set to overwrite");
238 break;
239 case OPT_SUBBUF_SIZE:
240 chan.attr.subbuf_size = atol(poptGetOptArg(pc));
5a0de755 241 DBG("Channel subbuf size set to %" PRIu64, chan.attr.subbuf_size);
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242 break;
243 case OPT_NUM_SUBBUF:
244 chan.attr.num_subbuf = atoi(poptGetOptArg(pc));
5a0de755 245 DBG("Channel subbuf num set to %" PRIu64, chan.attr.num_subbuf);
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246 break;
247 case OPT_SWITCH_TIMER:
248 chan.attr.switch_timer_interval = atoi(poptGetOptArg(pc));
249 DBG("Channel switch timer interval set to %d", chan.attr.switch_timer_interval);
250 break;
251 case OPT_READ_TIMER:
252 chan.attr.read_timer_interval = atoi(poptGetOptArg(pc));
253 DBG("Channel read timer interval set to %d", chan.attr.read_timer_interval);
d36b8583 254 break;
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255 case OPT_USERSPACE:
256 opt_userspace = 1;
eeac7d46 257 break;
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258 default:
259 usage(stderr);
260 ret = CMD_UNDEFINED;
261 goto end;
262 }
263 }
264
265 opt_channels = (char*) poptGetArg(pc);
266 if (opt_channels == NULL) {
7d29a247 267 ERR("Missing channel name.\n");
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268 usage(stderr);
269 ret = CMD_SUCCESS;
270 goto end;
271 }
272
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273 if (!opt_session_name) {
274 session_name = get_session_name();
275 if (session_name == NULL) {
276 ret = -1;
277 goto end;
278 }
279 } else {
280 session_name = opt_session_name;
281 }
282
283 ret = enable_channel(session_name);
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284
285end:
286 return ret;
287}
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