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.
26 #include <sys/types.h>
30 #include <common/mi-lttng.h>
32 #include "../command.h"
35 #include <common/defaults.h>
36 #include <common/sessiond-comm/sessiond-comm.h>
37 #include <common/uri.h>
38 #include <common/utils.h>
39 #include <lttng/snapshot.h>
41 static char *opt_output_path
;
42 static char *opt_session_name
;
44 static char *opt_ctrl_url
;
45 static char *opt_data_url
;
46 static int opt_no_consumer
;
47 static int opt_no_output
;
48 static int opt_snapshot
;
49 static unsigned int opt_live_timer
;
57 static struct mi_writer
*writer
;
59 static struct poptOption long_options
[] = {
60 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
61 {"help", 'h', POPT_ARG_NONE
, NULL
, OPT_HELP
, NULL
, NULL
},
62 {"output", 'o', POPT_ARG_STRING
, &opt_output_path
, 0, NULL
, NULL
},
63 {"list-options", 0, POPT_ARG_NONE
, NULL
, OPT_LIST_OPTIONS
, NULL
, NULL
},
64 {"set-url", 'U', POPT_ARG_STRING
, &opt_url
, 0, 0, 0},
65 {"ctrl-url", 'C', POPT_ARG_STRING
, &opt_ctrl_url
, 0, 0, 0},
66 {"data-url", 'D', POPT_ARG_STRING
, &opt_data_url
, 0, 0, 0},
67 {"no-output", 0, POPT_ARG_VAL
, &opt_no_output
, 1, 0, 0},
68 {"no-consumer", 0, POPT_ARG_VAL
, &opt_no_consumer
, 1, 0, 0},
69 {"snapshot", 0, POPT_ARG_VAL
, &opt_snapshot
, 1, 0, 0},
70 {"live", 0, POPT_ARG_INT
| POPT_ARGFLAG_OPTIONAL
, 0, OPT_LIVE_TIMER
, 0, 0},
75 * Please have a look at src/lib/lttng-ctl/lttng-ctl.c for more information on
76 * why this declaration exists and used ONLY in for this command.
78 extern int _lttng_create_session_ext(const char *name
, const char *url
,
79 const char *datetime
, int live_timer
);
84 static void usage(FILE *ofp
)
86 fprintf(ofp
, "usage: lttng create [NAME] [OPTIONS] \n");
88 fprintf(ofp
, "Without a given NAME, the default is 'auto-<yyyymmdd>-<hhmmss>'\n");
90 fprintf(ofp
, "Options:\n");
91 fprintf(ofp
, " -h, --help Show this help\n");
92 fprintf(ofp
, " --list-options Simple listing of options\n");
93 fprintf(ofp
, " -o, --output PATH Specify output path for traces\n");
94 fprintf(ofp
, " --no-output Traces will not be outputted\n");
95 fprintf(ofp
, " --snapshot Set the session in snapshot mode.\n");
96 fprintf(ofp
, " Created in no-output mode and uses the URL,\n");
97 fprintf(ofp
, " if one, as the default snapshot output.\n");
98 fprintf(ofp
, " Every channel will be set in overwrite mode\n");
99 fprintf(ofp
, " and with mmap output (splice not supported).\n");
100 fprintf(ofp
, " --live [USEC] Set the session in live-reading mode.\n");
101 fprintf(ofp
, " The delay parameter in micro-seconds is the\n");
102 fprintf(ofp
, " maximum time the user can wait for the data\n");
103 fprintf(ofp
, " to be flushed. Can be set with a network\n");
104 fprintf(ofp
, " URL (-U or -C/-D) and must have a relayd listening.\n");
105 fprintf(ofp
, " By default, %u is used for the timer and the\n",
106 DEFAULT_LTTNG_LIVE_TIMER
);
107 fprintf(ofp
, " network URL is set to net://127.0.0.1.\n");
109 fprintf(ofp
, "Extended Options:\n");
111 fprintf(ofp
, "Using these options, each API call can be controlled individually.\n");
113 fprintf(ofp
, " -U, --set-url=URL Set URL destination of the trace data.\n");
114 fprintf(ofp
, " It is persistent for the session lifetime.\n");
115 fprintf(ofp
, " This will set both data and control URL.\n");
116 fprintf(ofp
, " -C, --ctrl-url=URL Set control path URL. (Must use -D also)\n");
117 fprintf(ofp
, " -D, --data-url=URL Set data path URL. (Must use -C also)\n");
119 fprintf(ofp
, "Please refer to the man page (lttng(1)) for more information on network\n");
120 fprintf(ofp
, "streaming mechanisms and explanation of the control and data port\n");
121 fprintf(ofp
, "You must have a running remote lttng-relayd for network streaming\n");
123 fprintf(ofp
, "URL format is has followed:\n");
125 fprintf(ofp
, " proto://[HOST|IP][:PORT1[:PORT2]][/TRACE_PATH]\n");
127 fprintf(ofp
, " Supported protocols are (proto):\n");
128 fprintf(ofp
, " > file://...\n");
129 fprintf(ofp
, " Local filesystem full path.\n");
131 fprintf(ofp
, " > net[6]://...\n");
132 fprintf(ofp
, " This will use the default network transport layer which is\n");
133 fprintf(ofp
, " TCP for both control (PORT1) and data port (PORT2).\n");
134 fprintf(ofp
, " The default ports are respectively 5342 and 5343.\n");
136 fprintf(ofp
, " > tcp[6]://...\n");
137 fprintf(ofp
, " Can only be used with -C and -D together\n");
139 fprintf(ofp
, "NOTE: IPv6 address MUST be enclosed in brackets '[]' (rfc2732)\n");
141 fprintf(ofp
, "Examples:\n");
142 fprintf(ofp
, " # lttng create -U net://192.168.1.42\n");
143 fprintf(ofp
, " Uses TCP and default ports for the given destination.\n");
144 fprintf(ofp
, " # lttng create -U net6://[fe80::f66d:4ff:fe53:d220]\n");
145 fprintf(ofp
, " Uses TCP, default ports and IPv6.\n");
146 fprintf(ofp
, " # lttng create s1 -U net://myhost.com:3229\n");
147 fprintf(ofp
, " Set the consumer to the remote HOST on port 3229 for control.\n");
152 * Retrieve the created session and mi output it based on provided argument
153 * This is currently a summary of what was pretty printed and is subject to
156 static int mi_created_session(const char *session_name
)
158 int ret
, i
, count
, found
;
159 struct lttng_session
*sessions
;
161 /* session_name should not be null */
162 assert(session_name
);
165 count
= lttng_list_sessions(&sessions
);
168 ERR("%s", lttng_strerror(ret
));
173 ERR("Error session creation failed: session %s not found", session_name
);
174 ret
= -LTTNG_ERR_SESS_NOT_FOUND
;
179 for (i
= 0; i
< count
; i
++) {
180 if (strncmp(sessions
[i
].name
, session_name
, NAME_MAX
) == 0) {
182 ret
= mi_lttng_session(writer
, &sessions
[i
], 0);
191 ret
= -LTTNG_ERR_SESS_NOT_FOUND
;
203 * For a session name, set the consumer URLs.
205 static int set_consumer_url(const char *session_name
, const char *ctrl_url
,
206 const char *data_url
)
209 struct lttng_handle
*handle
;
210 struct lttng_domain dom
;
212 assert(session_name
);
215 * Set handle with the session name and the domain set to 0. This means to
216 * the session daemon that the next action applies on the tracing session
217 * rather then the domain specific session.
219 memset(&dom
, 0, sizeof(dom
));
221 handle
= lttng_create_handle(session_name
, &dom
);
222 if (handle
== NULL
) {
227 ret
= lttng_set_consumer_url(handle
, ctrl_url
, data_url
);
233 MSG("Control URL %s set for session %s", ctrl_url
, session_name
);
237 MSG("Data URL %s set for session %s", data_url
, session_name
);
241 lttng_destroy_handle(handle
);
245 static int add_snapshot_output(const char *session_name
, const char *ctrl_url
,
246 const char *data_url
)
249 struct lttng_snapshot_output
*output
= NULL
;
251 assert(session_name
);
253 output
= lttng_snapshot_output_create();
260 ret
= lttng_snapshot_output_set_ctrl_url(ctrl_url
, output
);
267 ret
= lttng_snapshot_output_set_data_url(data_url
, output
);
273 /* This call, if successful, populates the id of the output object. */
274 ret
= lttng_snapshot_add_output(session_name
, output
);
280 lttng_snapshot_output_destroy(output
);
286 * Create a tracing session.
287 * If no name is specified, a default name is generated.
289 * Returns one of the CMD_* result constants.
291 static int create_session(void)
294 char *session_name
= NULL
, *traces_path
= NULL
, *alloc_path
= NULL
;
295 char *alloc_url
= NULL
, *url
= NULL
, datetime
[16];
296 char session_name_date
[NAME_MAX
+ 17], *print_str_url
= NULL
;
300 /* Get date and time for automatic session name/path */
302 timeinfo
= localtime(&rawtime
);
303 strftime(datetime
, sizeof(datetime
), "%Y%m%d-%H%M%S", timeinfo
);
305 /* Auto session name creation */
306 if (opt_session_name
== NULL
) {
307 ret
= snprintf(session_name_date
, sizeof(session_name_date
),
308 DEFAULT_SESSION_NAME
"-%s", datetime
);
310 PERROR("snprintf session name");
313 session_name
= session_name_date
;
314 DBG("Auto session name set to %s", session_name_date
);
316 if (strlen(opt_session_name
) > NAME_MAX
) {
317 ERR("Session name too long. Length must be lower or equal to %d",
319 ret
= LTTNG_ERR_SESSION_FAIL
;
323 * Check if the session name begins with "auto-" or is exactly "auto".
324 * Both are reserved for the default session name. See bug #449 to
325 * understand why we need to check both here.
327 if ((strncmp(opt_session_name
, DEFAULT_SESSION_NAME
"-",
328 strlen(DEFAULT_SESSION_NAME
) + 1) == 0) ||
329 (strncmp(opt_session_name
, DEFAULT_SESSION_NAME
,
330 strlen(DEFAULT_SESSION_NAME
)) == 0 &&
331 strlen(opt_session_name
) == strlen(DEFAULT_SESSION_NAME
))) {
332 ERR("%s is a reserved keyword for default session(s)",
333 DEFAULT_SESSION_NAME
);
337 session_name
= opt_session_name
;
338 ret
= snprintf(session_name_date
, sizeof(session_name_date
),
339 "%s-%s", session_name
, datetime
);
341 PERROR("snprintf session name");
346 if ((!opt_ctrl_url
&& opt_data_url
) || (opt_ctrl_url
&& !opt_data_url
)) {
347 ERR("You need both control and data URL.");
352 if (opt_output_path
!= NULL
) {
353 traces_path
= utils_expand_path(opt_output_path
);
354 if (traces_path
== NULL
) {
359 /* Create URL string from the local file system path */
360 ret
= asprintf(&alloc_url
, "file://%s", traces_path
);
362 PERROR("asprintf url path");
366 /* URL to use in the lttng_create_session() call */
368 print_str_url
= traces_path
;
369 } else if (opt_url
) { /* Handling URL (-U opt) */
372 } else if (opt_data_url
&& opt_ctrl_url
) {
374 * With both control and data, we'll be setting the consumer URL after
375 * session creation thus use no URL.
378 } else if (!opt_no_output
) {
379 /* Auto output path */
380 alloc_path
= utils_get_home_dir();
381 if (alloc_path
== NULL
) {
382 ERR("HOME path not found.\n \
383 Please specify an output path using -o, --output PATH");
387 alloc_path
= strdup(alloc_path
);
389 ret
= asprintf(&alloc_url
,
390 "file://%s/" DEFAULT_TRACE_DIR_NAME
"/%s",
391 alloc_path
, session_name_date
);
393 PERROR("asprintf trace dir name");
399 print_str_url
= alloc_url
+ strlen("file://");
401 /* No output means --no-output or --snapshot mode. */
405 /* Use default live URL if NO url is/are found. */
406 if ((opt_live_timer
&& !opt_url
) && (opt_live_timer
&& !opt_data_url
)) {
407 ret
= asprintf(&alloc_url
, "net://127.0.0.1");
409 PERROR("asprintf default live URL");
417 if (opt_snapshot
&& opt_live_timer
) {
418 ERR("Snapshot and live modes are mutually exclusive.");
424 /* No output by default. */
425 const char *snapshot_url
= NULL
;
429 } else if (!opt_data_url
&& !opt_ctrl_url
) {
430 /* This is the session path that we need to use as output. */
433 ret
= lttng_create_session_snapshot(session_name
, snapshot_url
);
434 } else if (opt_live_timer
) {
435 const char *pathname
;
437 if (opt_relayd_path
) {
438 pathname
= opt_relayd_path
;
440 pathname
= INSTALL_BIN_PATH
"/lttng-relayd";
442 if (!opt_url
&& !opt_data_url
&& !check_relayd() &&
443 spawn_relayd(pathname
, 0) < 0) {
446 ret
= lttng_create_session_live(session_name
, url
, opt_live_timer
);
448 ret
= _lttng_create_session_ext(session_name
, url
, datetime
, -1);
451 /* Don't set ret so lttng can interpret the sessiond error. */
453 case LTTNG_ERR_EXIST_SESS
:
454 WARN("Session %s already exists", session_name
);
462 if (opt_ctrl_url
&& opt_data_url
) {
464 ret
= add_snapshot_output(session_name
, opt_ctrl_url
,
467 /* Setting up control URI (-C or/and -D opt) */
468 ret
= set_consumer_url(session_name
, opt_ctrl_url
, opt_data_url
);
471 /* Destroy created session because the URL are not valid. */
472 lttng_destroy_session(session_name
);
477 MSG("Session %s created.", session_name
);
478 if (print_str_url
&& !opt_snapshot
) {
479 MSG("Traces will be written in %s", print_str_url
);
481 if (opt_live_timer
) {
482 MSG("Live timer set to %u usec", opt_live_timer
);
484 } else if (opt_snapshot
) {
486 MSG("Default snapshot output set to: %s", print_str_url
);
488 MSG("Snapshot mode set. Every channel enabled for that session will "
489 "be set in overwrite mode and mmap output.");
494 ret
= mi_created_session(session_name
);
501 /* Init lttng session config */
502 ret
= config_init(session_name
);
516 ERR("%s", lttng_strerror(ret
));
522 * The 'create <options>' first level command
524 * Returns one of the CMD_* result constants.
526 int cmd_create(int argc
, const char **argv
)
528 int opt
, ret
= CMD_SUCCESS
, command_ret
= CMD_SUCCESS
, success
= 1;
529 char *opt_arg
= NULL
;
530 static poptContext pc
;
532 pc
= poptGetContext(NULL
, argc
, argv
, long_options
, 0);
533 poptReadDefaultConfig(pc
, 0);
535 while ((opt
= poptGetNextOpt(pc
)) != -1) {
540 case OPT_LIST_OPTIONS
:
541 list_cmd_options(stdout
, long_options
);
548 opt_arg
= poptGetOptArg(pc
);
550 /* Set up default values. */
551 opt_live_timer
= (uint32_t) DEFAULT_LTTNG_LIVE_TIMER
;
552 DBG("Session live timer interval set to default value %d",
557 v
= strtoul(opt_arg
, NULL
, 0);
558 if (errno
!= 0 || !isdigit(opt_arg
[0])) {
559 ERR("Wrong value in --live parameter: %s", opt_arg
);
563 if (v
!= (uint32_t) v
) {
564 ERR("32-bit overflow in --live parameter: %s", opt_arg
);
568 opt_live_timer
= (uint32_t) v
;
569 DBG("Session live timer interval set to %d", opt_live_timer
);
579 if (opt_no_consumer
) {
580 MSG("The option --no-consumer is obsolete. Use --no-output now.");
585 /* MI initialization */
587 writer
= mi_lttng_writer_create(fileno(stdout
), lttng_opt_mi
);
589 ret
= -LTTNG_ERR_NOMEM
;
593 /* Open command element */
594 ret
= mi_lttng_writer_command_open(writer
,
595 mi_lttng_element_command_create
);
601 /* Open output element */
602 ret
= mi_lttng_writer_open_element(writer
,
603 mi_lttng_element_command_output
);
609 opt_session_name
= (char*) poptGetArg(pc
);
611 command_ret
= create_session();
617 /* Close output element */
618 ret
= mi_lttng_writer_close_element(writer
);
625 ret
= mi_lttng_writer_write_element_bool(writer
,
626 mi_lttng_element_command_success
, success
);
632 /* Command element close */
633 ret
= mi_lttng_writer_command_close(writer
);
642 if (writer
&& mi_lttng_writer_destroy(writer
)) {
643 /* Preserve original error code */
644 ret
= ret
? ret
: -LTTNG_ERR_MI_IO_FAIL
;
647 /* Overwrite ret if an error occurred in create_session() */
648 ret
= command_ret
? command_ret
: ret
;