2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
24 #include <sys/types.h>
30 #include "../command.h"
33 #include <src/common/sessiond-comm/sessiond-comm.h>
34 #include <src/common/utils.h>
36 static char *opt_channels
;
37 static int opt_kernel
;
38 static char *opt_session_name
;
39 static int opt_userspace
;
40 static struct lttng_channel chan
;
41 static char *opt_output
;
42 static int opt_buffer_uid
;
43 static int opt_buffer_pid
;
44 static int opt_buffer_global
;
60 static struct lttng_handle
*handle
;
62 const char *output_mmap
= "mmap";
63 const char *output_splice
= "splice";
65 static struct poptOption long_options
[] = {
66 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
67 {"help", 'h', POPT_ARG_NONE
, 0, OPT_HELP
, 0, 0},
68 {"session", 's', POPT_ARG_STRING
, &opt_session_name
, 0, 0, 0},
69 {"kernel", 'k', POPT_ARG_VAL
, &opt_kernel
, 1, 0, 0},
70 {"userspace", 'u', POPT_ARG_NONE
, 0, OPT_USERSPACE
, 0, 0},
71 {"discard", 0, POPT_ARG_NONE
, 0, OPT_DISCARD
, 0, 0},
72 {"overwrite", 0, POPT_ARG_NONE
, 0, OPT_OVERWRITE
, 0, 0},
73 {"subbuf-size", 0, POPT_ARG_STRING
, 0, OPT_SUBBUF_SIZE
, 0, 0},
74 {"num-subbuf", 0, POPT_ARG_INT
, 0, OPT_NUM_SUBBUF
, 0, 0},
75 {"switch-timer", 0, POPT_ARG_INT
, 0, OPT_SWITCH_TIMER
, 0, 0},
76 {"read-timer", 0, POPT_ARG_INT
, 0, OPT_READ_TIMER
, 0, 0},
77 {"list-options", 0, POPT_ARG_NONE
, NULL
, OPT_LIST_OPTIONS
, NULL
, NULL
},
78 {"output", 0, POPT_ARG_STRING
, &opt_output
, 0, 0, 0},
79 {"buffers-uid", 0, POPT_ARG_VAL
, &opt_buffer_uid
, 1, 0, 0},
80 {"buffers-pid", 0, POPT_ARG_VAL
, &opt_buffer_pid
, 1, 0, 0},
81 {"buffers-global", 0, POPT_ARG_VAL
, &opt_buffer_global
, 1, 0, 0},
82 {"tracefile-size", 'C', POPT_ARG_INT
, 0, OPT_TRACEFILE_SIZE
, 0, 0},
83 {"tracefile-count", 'W', POPT_ARG_INT
, 0, OPT_TRACEFILE_COUNT
, 0, 0},
90 static void usage(FILE *ofp
)
92 fprintf(ofp
, "usage: lttng enable-channel NAME[,NAME2,...] [-u|-k] [OPTIONS]\n");
94 fprintf(ofp
, "Options:\n");
95 fprintf(ofp
, " -h, --help Show this help\n");
96 fprintf(ofp
, " --list-options Simple listing of options\n");
97 fprintf(ofp
, " -s, --session NAME Apply to session name\n");
98 fprintf(ofp
, " -k, --kernel Apply to the kernel tracer\n");
99 fprintf(ofp
, " -u, --userspace Apply to the user-space tracer\n");
101 fprintf(ofp
, "Channel options:\n");
102 fprintf(ofp
, " --discard Discard event when buffers are full%s\n",
103 DEFAULT_CHANNEL_OVERWRITE
? "" : " (default)");
104 fprintf(ofp
, " --overwrite Flight recorder mode%s\n",
105 DEFAULT_CHANNEL_OVERWRITE
? " (default)" : "");
106 fprintf(ofp
, " --subbuf-size SIZE Subbuffer size in bytes {+k,+M,+G}\n");
107 fprintf(ofp
, " (default UST uid: %zu, UST pid: %zu, kernel: %zu, metadata: %zu)\n",
108 default_get_ust_uid_channel_subbuf_size(),
109 default_get_ust_pid_channel_subbuf_size(),
110 default_get_kernel_channel_subbuf_size(),
111 default_get_metadata_subbuf_size());
112 fprintf(ofp
, " Rounded up to the next power of 2.\n");
113 fprintf(ofp
, " --num-subbuf NUM Number of subbufers\n");
114 fprintf(ofp
, " (default UST uid: %u, UST pid: %u, kernel: %u, metadata: %u)\n",
115 DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM
, DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM
,
116 DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM
, DEFAULT_METADATA_SUBBUF_NUM
);
117 fprintf(ofp
, " Rounded up to the next power of 2.\n");
118 fprintf(ofp
, " --switch-timer USEC Switch timer interval in usec\n");
119 fprintf(ofp
, " (default UST uid: %u, UST pid: %u, kernel: %u, metadata: %u)\n",
120 DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER
, DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER
,
121 DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER
, DEFAULT_METADATA_SWITCH_TIMER
);
122 fprintf(ofp
, " --read-timer USEC Read timer interval in usec.\n");
123 fprintf(ofp
, " (default UST uid: %u, UST pid: %u, kernel: %u, metadata: %u)\n",
124 DEFAULT_UST_UID_CHANNEL_READ_TIMER
, DEFAULT_UST_UID_CHANNEL_READ_TIMER
,
125 DEFAULT_KERNEL_CHANNEL_READ_TIMER
, DEFAULT_METADATA_READ_TIMER
);
126 fprintf(ofp
, " --output TYPE Channel output type (Values: %s, %s)\n",
127 output_mmap
, output_splice
);
128 fprintf(ofp
, " (default UST uid: %s, UST pid: %s, kernel: %s, metadata: %s)\n",
129 DEFAULT_UST_UID_CHANNEL_OUTPUT
== LTTNG_EVENT_MMAP
? output_mmap
: output_splice
,
130 DEFAULT_UST_PID_CHANNEL_OUTPUT
== LTTNG_EVENT_MMAP
? output_mmap
: output_splice
,
131 DEFAULT_KERNEL_CHANNEL_OUTPUT
== LTTNG_EVENT_MMAP
? output_mmap
: output_splice
,
132 DEFAULT_METADATA_OUTPUT
== LTTNG_EVENT_MMAP
? output_mmap
: output_splice
);
133 fprintf(ofp
, " --buffers-uid Use per UID buffer (-u only)\n");
134 fprintf(ofp
, " --buffers-pid Use per PID buffer (-u only)\n");
135 fprintf(ofp
, " --buffers-global Use shared buffer for the whole system (-k only)\n");
136 fprintf(ofp
, " -C, --tracefile-size SIZE\n");
137 fprintf(ofp
, " Maximum size of each tracefile within a stream (in bytes). 0 means unlimited.\n");
138 fprintf(ofp
, " (default: %u)\n", DEFAULT_CHANNEL_TRACEFILE_SIZE
);
139 fprintf(ofp
, " -W, --tracefile-count COUNT\n");
140 fprintf(ofp
, " Used in conjunction with -C option, this will limit the number\n");
141 fprintf(ofp
, " of files created to the specified count. 0 means unlimited.\n");
142 fprintf(ofp
, " (default: %u)\n", DEFAULT_CHANNEL_TRACEFILE_COUNT
);
147 * Set default attributes depending on those already defined from the command
150 static void set_default_attr(struct lttng_domain
*dom
)
152 struct lttng_channel_attr default_attr
;
155 lttng_channel_set_default_attr(dom
, &default_attr
);
157 if (chan
.attr
.overwrite
== -1) {
158 chan
.attr
.overwrite
= default_attr
.overwrite
;
160 if (chan
.attr
.subbuf_size
== -1) {
161 chan
.attr
.subbuf_size
= default_attr
.subbuf_size
;
163 if (chan
.attr
.num_subbuf
== -1) {
164 chan
.attr
.num_subbuf
= default_attr
.num_subbuf
;
166 if (chan
.attr
.switch_timer_interval
== -1) {
167 chan
.attr
.switch_timer_interval
= default_attr
.switch_timer_interval
;
169 if (chan
.attr
.read_timer_interval
== -1) {
170 chan
.attr
.read_timer_interval
= default_attr
.read_timer_interval
;
172 if (chan
.attr
.output
== -1) {
173 chan
.attr
.output
= default_attr
.output
;
175 if (chan
.attr
.tracefile_count
== -1) {
176 chan
.attr
.tracefile_count
= default_attr
.tracefile_count
;
178 if (chan
.attr
.tracefile_size
== -1) {
179 chan
.attr
.tracefile_size
= default_attr
.tracefile_size
;
184 * Adding channel using the lttng API.
186 static int enable_channel(char *session_name
)
188 int ret
= CMD_SUCCESS
, warn
= 0;
190 struct lttng_domain dom
;
192 memset(&dom
, 0, sizeof(dom
));
194 /* Create lttng domain */
196 dom
.type
= LTTNG_DOMAIN_KERNEL
;
197 dom
.buf_type
= LTTNG_BUFFER_GLOBAL
;
198 if (opt_buffer_uid
|| opt_buffer_pid
) {
199 ERR("Buffer type not supported for domain -k");
203 } else if (opt_userspace
) {
204 dom
.type
= LTTNG_DOMAIN_UST
;
205 if (opt_buffer_uid
) {
206 dom
.buf_type
= LTTNG_BUFFER_PER_UID
;
208 if (opt_buffer_global
) {
209 ERR("Buffer type not supported for domain -u");
213 dom
.buf_type
= LTTNG_BUFFER_PER_PID
;
216 ERR("Please specify a tracer (-k/--kernel or -u/--userspace)");
221 set_default_attr(&dom
);
223 if ((chan
.attr
.tracefile_size
> 0) &&
224 (chan
.attr
.tracefile_size
< chan
.attr
.subbuf_size
)) {
225 WARN("Tracefile size rounded up from (%" PRIu64
") to subbuffer size (%" PRIu64
")",
226 chan
.attr
.tracefile_size
, chan
.attr
.subbuf_size
);
227 chan
.attr
.tracefile_size
= chan
.attr
.subbuf_size
;
230 /* Setting channel output */
232 if (!strncmp(output_mmap
, opt_output
, strlen(output_mmap
))) {
233 chan
.attr
.output
= LTTNG_EVENT_MMAP
;
234 } else if (!strncmp(output_splice
, opt_output
, strlen(output_splice
))) {
235 chan
.attr
.output
= LTTNG_EVENT_SPLICE
;
237 ERR("Unknown output type %s. Possible values are: %s, %s\n",
238 opt_output
, output_mmap
, output_splice
);
245 handle
= lttng_create_handle(session_name
, &dom
);
246 if (handle
== NULL
) {
251 /* Strip channel list (format: chan1,chan2,...) */
252 channel_name
= strtok(opt_channels
, ",");
253 while (channel_name
!= NULL
) {
254 /* Copy channel name and normalize it */
255 strncpy(chan
.name
, channel_name
, NAME_MAX
);
256 chan
.name
[NAME_MAX
- 1] = '\0';
258 DBG("Enabling channel %s", channel_name
);
260 ret
= lttng_enable_channel(handle
, &chan
);
263 case LTTNG_ERR_KERN_CHAN_EXIST
:
264 case LTTNG_ERR_UST_CHAN_EXIST
:
265 WARN("Channel %s: %s (session %s)", channel_name
,
266 lttng_strerror(ret
), session_name
);
269 ERR("Channel %s: %s (session %s)", channel_name
,
270 lttng_strerror(ret
), session_name
);
275 MSG("%s channel %s enabled for session %s",
276 opt_kernel
? "Kernel" : "UST", channel_name
,
281 channel_name
= strtok(NULL
, ",");
291 lttng_destroy_handle(handle
);
297 * Default value for channel configuration.
299 static void init_channel_config(void)
302 * Put -1 everywhere so we can identify those set by the command line and
303 * those needed to be set by the default values.
305 memset(&chan
.attr
, -1, sizeof(chan
.attr
));
309 * Add channel to trace session
311 int cmd_enable_channels(int argc
, const char **argv
)
313 int opt
, ret
= CMD_SUCCESS
;
314 static poptContext pc
;
315 char *session_name
= NULL
;
316 char *opt_arg
= NULL
;
318 init_channel_config();
320 pc
= poptGetContext(NULL
, argc
, argv
, long_options
, 0);
321 poptReadDefaultConfig(pc
, 0);
323 while ((opt
= poptGetNextOpt(pc
)) != -1) {
329 chan
.attr
.overwrite
= 0;
330 DBG("Channel set to discard");
333 chan
.attr
.overwrite
= 1;
334 DBG("Channel set to overwrite");
336 case OPT_SUBBUF_SIZE
:
338 uint64_t rounded_size
;
342 opt_arg
= poptGetOptArg(pc
);
343 if (utils_parse_size_suffix(opt_arg
, &chan
.attr
.subbuf_size
) < 0 || !chan
.attr
.subbuf_size
) {
344 ERR("Wrong value in --subbuf-size parameter: %s", opt_arg
);
349 order
= get_count_order_u64(chan
.attr
.subbuf_size
);
351 rounded_size
= 1ULL << order
;
352 if (rounded_size
!= chan
.attr
.subbuf_size
) {
353 WARN("The subbuf size (%" PRIu64
") is rounded to the next power of 2 (%" PRIu64
")",
354 chan
.attr
.subbuf_size
, rounded_size
);
355 chan
.attr
.subbuf_size
= rounded_size
;
358 /* Should now be power of 2 */
359 assert(!((chan
.attr
.subbuf_size
- 1) & chan
.attr
.subbuf_size
));
361 DBG("Channel subbuf size set to %" PRIu64
, chan
.attr
.subbuf_size
);
366 uint64_t rounded_size
;
370 opt_arg
= poptGetOptArg(pc
);
371 chan
.attr
.num_subbuf
= strtoull(opt_arg
, NULL
, 0);
372 if (errno
!= 0 || !chan
.attr
.num_subbuf
|| !isdigit(opt_arg
[0])) {
373 ERR("Wrong value in --num-subbuf parameter: %s", opt_arg
);
378 order
= get_count_order_u64(chan
.attr
.num_subbuf
);
380 rounded_size
= 1ULL << order
;
381 if (rounded_size
!= chan
.attr
.num_subbuf
) {
382 WARN("The number of subbuffers (%" PRIu64
") is rounded to the next power of 2 (%" PRIu64
")",
383 chan
.attr
.num_subbuf
, rounded_size
);
384 chan
.attr
.num_subbuf
= rounded_size
;
387 /* Should now be power of 2 */
388 assert(!((chan
.attr
.num_subbuf
- 1) & chan
.attr
.num_subbuf
));
390 DBG("Channel subbuf num set to %" PRIu64
, chan
.attr
.num_subbuf
);
393 case OPT_SWITCH_TIMER
:
398 opt_arg
= poptGetOptArg(pc
);
399 v
= strtoul(opt_arg
, NULL
, 0);
400 if (errno
!= 0 || !isdigit(opt_arg
[0])) {
401 ERR("Wrong value in --switch-timer parameter: %s", opt_arg
);
405 if (v
!= (uint32_t) v
) {
406 ERR("32-bit overflow in --switch-timer parameter: %s", opt_arg
);
410 chan
.attr
.switch_timer_interval
= (uint32_t) v
;
411 DBG("Channel switch timer interval set to %d", chan
.attr
.switch_timer_interval
);
419 opt_arg
= poptGetOptArg(pc
);
420 v
= strtoul(opt_arg
, NULL
, 0);
421 if (errno
!= 0 || !isdigit(opt_arg
[0])) {
422 ERR("Wrong value in --read-timer parameter: %s", opt_arg
);
426 if (v
!= (uint32_t) v
) {
427 ERR("32-bit overflow in --read-timer parameter: %s", opt_arg
);
431 chan
.attr
.read_timer_interval
= (uint32_t) v
;
432 DBG("Channel read timer interval set to %d", chan
.attr
.read_timer_interval
);
438 case OPT_TRACEFILE_SIZE
:
439 opt_arg
= poptGetOptArg(pc
);
440 if (utils_parse_size_suffix(opt_arg
, &chan
.attr
.tracefile_size
) < 0) {
441 ERR("Wrong value in --tracefile-size parameter: %s", opt_arg
);
445 DBG("Maximum tracefile size set to %" PRIu64
,
446 chan
.attr
.tracefile_size
);
448 case OPT_TRACEFILE_COUNT
:
453 opt_arg
= poptGetOptArg(pc
);
454 v
= strtoul(opt_arg
, NULL
, 0);
455 if (errno
!= 0 || !isdigit(opt_arg
[0])) {
456 ERR("Wrong value in --tracefile-count parameter: %s", opt_arg
);
460 if (v
!= (uint32_t) v
) {
461 ERR("32-bit overflow in --tracefile-count parameter: %s", opt_arg
);
465 chan
.attr
.tracefile_count
= (uint32_t) v
;
466 DBG("Maximum tracefile count set to %" PRIu64
,
467 chan
.attr
.tracefile_count
);
470 case OPT_LIST_OPTIONS
:
471 list_cmd_options(stdout
, long_options
);
480 opt_channels
= (char*) poptGetArg(pc
);
481 if (opt_channels
== NULL
) {
482 ERR("Missing channel name.\n");
488 if (!opt_session_name
) {
489 session_name
= get_session_name();
490 if (session_name
== NULL
) {
495 session_name
= opt_session_name
;
498 ret
= enable_channel(session_name
);
501 if (!opt_session_name
&& session_name
) {