Commit | Line | Data |
---|---|---|
f3ed775e | 1 | /* |
21cf9b6b | 2 | * Copyright (C) 2011 EfficiOS Inc. |
ab5be9fa | 3 | * Copyright (C) 2019 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
f3ed775e | 4 | * |
ab5be9fa | 5 | * SPDX-License-Identifier: GPL-2.0-only |
f3ed775e | 6 | * |
f3ed775e DG |
7 | */ |
8 | ||
6c1c0768 | 9 | #define _LGPL_SOURCE |
c9e313bc SM |
10 | #include "../command.hpp" |
11 | #include "../utils.hpp" | |
f3ed775e | 12 | |
28ab034a | 13 | #include <common/compat/time.hpp> |
c9e313bc | 14 | #include <common/defaults.hpp> |
28ab034a JG |
15 | #include <common/mi-lttng.hpp> |
16 | #include <common/path.hpp> | |
c9e313bc SM |
17 | #include <common/sessiond-comm/sessiond-comm.hpp> |
18 | #include <common/uri.hpp> | |
19 | #include <common/utils.hpp> | |
28ab034a | 20 | |
050dd639 | 21 | #include <lttng/lttng.h> |
42224349 | 22 | |
28ab034a JG |
23 | #include <ctype.h> |
24 | #include <popt.h> | |
25 | #include <signal.h> | |
26 | #include <stdio.h> | |
27 | #include <stdlib.h> | |
28 | #include <string.h> | |
29 | #include <sys/stat.h> | |
30 | #include <sys/types.h> | |
31 | #include <sys/wait.h> | |
32 | #include <unistd.h> | |
33 | ||
f3ed775e | 34 | static char *opt_output_path; |
a4b92340 DG |
35 | static char *opt_url; |
36 | static char *opt_ctrl_url; | |
37 | static char *opt_data_url; | |
d7ba1388 | 38 | static char *opt_shm_path; |
a4b92340 | 39 | static int opt_no_consumer; |
96fe6b8d | 40 | static int opt_no_output; |
16f6f820 | 41 | static int opt_snapshot; |
c7219617 | 42 | static uint32_t opt_live_timer; |
f3ed775e | 43 | |
4fc83d94 PP |
44 | #ifdef LTTNG_EMBED_HELP |
45 | static const char help_msg[] = | |
46 | #include <lttng-create.1.h> | |
28ab034a | 47 | ; |
4fc83d94 PP |
48 | #endif |
49 | ||
f3ed775e DG |
50 | enum { |
51 | OPT_HELP = 1, | |
679b4943 | 52 | OPT_LIST_OPTIONS, |
ecc48a90 | 53 | OPT_LIVE_TIMER, |
f3ed775e DG |
54 | }; |
55 | ||
b178f53e JG |
56 | enum output_type { |
57 | OUTPUT_NONE, | |
58 | OUTPUT_LOCAL, | |
59 | OUTPUT_NETWORK, | |
60 | OUTPUT_UNSPECIFIED, | |
61 | }; | |
37d03ff7 | 62 | |
b178f53e | 63 | static struct mi_writer *writer; |
f3ed775e DG |
64 | static struct poptOption long_options[] = { |
65 | /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */ | |
28ab034a JG |
66 | { "help", 'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL }, |
67 | { "output", 'o', POPT_ARG_STRING, &opt_output_path, 0, NULL, NULL }, | |
68 | { "list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL }, | |
69 | { "set-url", 'U', POPT_ARG_STRING, &opt_url, 0, 0, 0 }, | |
70 | { "ctrl-url", 'C', POPT_ARG_STRING, &opt_ctrl_url, 0, 0, 0 }, | |
71 | { "data-url", 'D', POPT_ARG_STRING, &opt_data_url, 0, 0, 0 }, | |
72 | { "no-output", 0, POPT_ARG_VAL, &opt_no_output, 1, 0, 0 }, | |
73 | { "no-consumer", 0, POPT_ARG_VAL, &opt_no_consumer, 1, 0, 0 }, | |
74 | { "snapshot", 0, POPT_ARG_VAL, &opt_snapshot, 1, 0, 0 }, | |
75 | { "live", 0, POPT_ARG_INT | POPT_ARGFLAG_OPTIONAL, 0, OPT_LIVE_TIMER, 0, 0 }, | |
76 | { "shm-path", 0, POPT_ARG_STRING, &opt_shm_path, 0, 0, 0 }, | |
77 | { 0, 0, 0, 0, 0, 0, 0 } | |
f3ed775e DG |
78 | }; |
79 | ||
37d03ff7 | 80 | /* |
485ca16f | 81 | * Retrieve the created session and mi output it based on provided argument |
37d03ff7 JRJ |
82 | * This is currently a summary of what was pretty printed and is subject to |
83 | * enhancements. | |
37d03ff7 JRJ |
84 | */ |
85 | static int mi_created_session(const char *session_name) | |
86 | { | |
87 | int ret, i, count, found; | |
88 | struct lttng_session *sessions; | |
89 | ||
90 | /* session_name should not be null */ | |
a0377dfe FD |
91 | LTTNG_ASSERT(session_name); |
92 | LTTNG_ASSERT(writer); | |
37d03ff7 JRJ |
93 | |
94 | count = lttng_list_sessions(&sessions); | |
95 | if (count < 0) { | |
96 | ret = count; | |
97 | ERR("%s", lttng_strerror(ret)); | |
98 | goto error; | |
99 | } | |
100 | ||
101 | if (count == 0) { | |
102 | ERR("Error session creation failed: session %s not found", session_name); | |
103 | ret = -LTTNG_ERR_SESS_NOT_FOUND; | |
104 | goto end; | |
105 | } | |
106 | ||
107 | found = 0; | |
108 | for (i = 0; i < count; i++) { | |
109 | if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) { | |
110 | found = 1; | |
111 | ret = mi_lttng_session(writer, &sessions[i], 0); | |
112 | if (ret) { | |
113 | goto error; | |
114 | } | |
115 | break; | |
116 | } | |
117 | } | |
118 | ||
119 | if (!found) { | |
120 | ret = -LTTNG_ERR_SESS_NOT_FOUND; | |
121 | } else { | |
122 | ret = CMD_SUCCESS; | |
123 | } | |
124 | ||
125 | error: | |
126 | free(sessions); | |
127 | end: | |
128 | return ret; | |
129 | } | |
130 | ||
28ab034a | 131 | static struct lttng_session_descriptor *create_session_descriptor(const char *session_name) |
16f6f820 | 132 | { |
b178f53e JG |
133 | ssize_t uri_count; |
134 | enum output_type output_type; | |
135 | struct lttng_uri *uris = NULL; | |
136 | struct lttng_session_descriptor *descriptor = NULL; | |
137 | const char *uri_str1 = NULL, *uri_str2 = NULL; | |
138 | char local_output_path[LTTNG_PATH_MAX] = {}; | |
139 | ||
140 | if (opt_no_output) { | |
141 | output_type = OUTPUT_NONE; | |
142 | } else if (opt_output_path) { | |
143 | char *expanded_output_path; | |
21a4b056 | 144 | int ret; |
b178f53e JG |
145 | |
146 | output_type = OUTPUT_LOCAL; | |
147 | expanded_output_path = utils_expand_path(opt_output_path); | |
148 | if (!expanded_output_path) { | |
149 | ERR("Failed to expand output path."); | |
150 | goto end; | |
151 | } | |
28ab034a JG |
152 | ret = lttng_strncpy( |
153 | local_output_path, expanded_output_path, sizeof(local_output_path)); | |
b178f53e JG |
154 | free(expanded_output_path); |
155 | if (ret) { | |
156 | ERR("Output path exceeds the maximal supported length (%zu bytes)", | |
28ab034a | 157 | sizeof(local_output_path)); |
b178f53e JG |
158 | goto end; |
159 | } | |
160 | } else if (opt_url || opt_ctrl_url) { | |
21a4b056 SM |
161 | int ret; |
162 | ||
b178f53e JG |
163 | uri_str1 = opt_ctrl_url ? opt_ctrl_url : opt_url; |
164 | uri_str2 = opt_data_url; | |
165 | ||
166 | uri_count = uri_parse_str_urls(uri_str1, uri_str2, &uris); | |
167 | if (uri_count != 1 && uri_count != 2) { | |
168 | ERR("Unrecognized URL format."); | |
169 | goto end; | |
170 | } | |
16f6f820 | 171 | |
b178f53e JG |
172 | switch (uri_count) { |
173 | case 1: | |
174 | output_type = OUTPUT_LOCAL; | |
175 | if (uris[0].dtype != LTTNG_DST_PATH) { | |
176 | ERR("Unrecognized URL format."); | |
177 | goto end; | |
178 | } | |
28ab034a JG |
179 | ret = lttng_strncpy( |
180 | local_output_path, uris[0].dst.path, sizeof(local_output_path)); | |
b178f53e JG |
181 | if (ret) { |
182 | ERR("Output path exceeds the maximal supported length (%zu bytes)", | |
28ab034a | 183 | sizeof(local_output_path)); |
b178f53e JG |
184 | } |
185 | break; | |
186 | case 2: | |
187 | output_type = OUTPUT_NETWORK; | |
188 | break; | |
189 | default: | |
190 | /* Already checked. */ | |
191 | abort(); | |
192 | } | |
193 | } else { | |
194 | output_type = OUTPUT_UNSPECIFIED; | |
16f6f820 DG |
195 | } |
196 | ||
b178f53e JG |
197 | if (opt_snapshot) { |
198 | /* Snapshot session. */ | |
199 | switch (output_type) { | |
200 | case OUTPUT_UNSPECIFIED: | |
201 | case OUTPUT_LOCAL: | |
202 | descriptor = lttng_session_descriptor_snapshot_local_create( | |
28ab034a JG |
203 | session_name, |
204 | output_type == OUTPUT_LOCAL ? local_output_path : NULL); | |
b178f53e JG |
205 | break; |
206 | case OUTPUT_NONE: | |
28ab034a | 207 | descriptor = lttng_session_descriptor_snapshot_create(session_name); |
b178f53e JG |
208 | break; |
209 | case OUTPUT_NETWORK: | |
210 | descriptor = lttng_session_descriptor_snapshot_network_create( | |
28ab034a | 211 | session_name, uri_str1, uri_str2); |
b178f53e JG |
212 | break; |
213 | default: | |
214 | abort(); | |
16f6f820 | 215 | } |
b178f53e JG |
216 | } else if (opt_live_timer) { |
217 | /* Live session. */ | |
28ab034a | 218 | if (output_type != OUTPUT_UNSPECIFIED && output_type != OUTPUT_NETWORK) { |
b178f53e JG |
219 | ERR("Unsupported output type specified for live session."); |
220 | goto end; | |
221 | } | |
222 | descriptor = lttng_session_descriptor_live_network_create( | |
28ab034a | 223 | session_name, uri_str1, uri_str2, opt_live_timer); |
b178f53e JG |
224 | } else { |
225 | /* Regular session. */ | |
226 | switch (output_type) { | |
227 | case OUTPUT_UNSPECIFIED: | |
228 | case OUTPUT_LOCAL: | |
229 | descriptor = lttng_session_descriptor_local_create( | |
28ab034a JG |
230 | session_name, |
231 | output_type == OUTPUT_LOCAL ? local_output_path : NULL); | |
b178f53e JG |
232 | break; |
233 | case OUTPUT_NONE: | |
28ab034a | 234 | descriptor = lttng_session_descriptor_create(session_name); |
b178f53e JG |
235 | break; |
236 | case OUTPUT_NETWORK: | |
237 | descriptor = lttng_session_descriptor_network_create( | |
28ab034a | 238 | session_name, uri_str1, uri_str2); |
b178f53e JG |
239 | break; |
240 | default: | |
241 | abort(); | |
16f6f820 DG |
242 | } |
243 | } | |
b178f53e JG |
244 | if (!descriptor) { |
245 | ERR("Failed to initialize session creation command."); | |
973ad93e JG |
246 | } else { |
247 | /* | |
248 | * Auto-launch the relay daemon when a live session | |
249 | * is created using default URLs. | |
250 | */ | |
28ab034a JG |
251 | if (!opt_url && !opt_ctrl_url && !opt_data_url && opt_live_timer && |
252 | !check_relayd()) { | |
973ad93e | 253 | int ret; |
28ab034a | 254 | const char *pathname = opt_relayd_path ?: INSTALL_BIN_PATH "/lttng-relayd"; |
973ad93e JG |
255 | |
256 | ret = spawn_relayd(pathname, 0); | |
257 | if (ret < 0) { | |
258 | lttng_session_descriptor_destroy(descriptor); | |
259 | descriptor = NULL; | |
260 | } | |
261 | } | |
16f6f820 | 262 | } |
b178f53e JG |
263 | end: |
264 | free(uris); | |
265 | return descriptor; | |
16f6f820 DG |
266 | } |
267 | ||
f3ed775e | 268 | /* |
1c8d13c8 TD |
269 | * Create a tracing session. |
270 | * If no name is specified, a default name is generated. | |
f3ed775e | 271 | * |
1c8d13c8 | 272 | * Returns one of the CMD_* result constants. |
f3ed775e | 273 | */ |
5b915816 | 274 | static int create_session(const char *session_name) |
f3ed775e | 275 | { |
b178f53e JG |
276 | int ret, i; |
277 | char shm_path[LTTNG_PATH_MAX] = {}; | |
278 | struct lttng_session_descriptor *session_descriptor = NULL; | |
279 | enum lttng_session_descriptor_status descriptor_status; | |
280 | enum lttng_error_code ret_code; | |
281 | struct lttng_session *sessions = NULL; | |
282 | const struct lttng_session *created_session = NULL; | |
283 | const char *created_session_name; | |
284 | ||
285 | /* Validate options. */ | |
5b915816 MJ |
286 | if (session_name) { |
287 | if (strlen(session_name) > NAME_MAX) { | |
28ab034a | 288 | ERR("Session name too long. Length must be lower or equal to %d", NAME_MAX); |
b178f53e | 289 | ret = CMD_ERROR; |
487b253b DG |
290 | goto error; |
291 | } | |
4b861950 DG |
292 | /* |
293 | * Check if the session name begins with "auto-" or is exactly "auto". | |
294 | * Both are reserved for the default session name. See bug #449 to | |
295 | * understand why we need to check both here. | |
296 | */ | |
28ab034a JG |
297 | if ((strncmp(session_name, |
298 | DEFAULT_SESSION_NAME "-", | |
299 | strlen(DEFAULT_SESSION_NAME) + 1) == 0) || | |
300 | (strncmp(session_name, DEFAULT_SESSION_NAME, strlen(DEFAULT_SESSION_NAME)) == | |
301 | 0 && | |
302 | strlen(session_name) == strlen(DEFAULT_SESSION_NAME))) { | |
61b35a5a | 303 | ERR("%s is a reserved keyword for default session(s)", |
28ab034a | 304 | DEFAULT_SESSION_NAME); |
61b35a5a DG |
305 | ret = CMD_ERROR; |
306 | goto error; | |
307 | } | |
f3ed775e DG |
308 | } |
309 | ||
b178f53e JG |
310 | if (opt_snapshot && opt_live_timer) { |
311 | ERR("Snapshot and live modes are mutually exclusive."); | |
1a241656 DG |
312 | ret = CMD_ERROR; |
313 | goto error; | |
314 | } | |
315 | ||
b178f53e JG |
316 | if ((!opt_ctrl_url && opt_data_url) || (opt_ctrl_url && !opt_data_url)) { |
317 | ERR("Both control and data URLs must be specified."); | |
318 | ret = CMD_ERROR; | |
319 | goto error; | |
00e2e675 DG |
320 | } |
321 | ||
5b915816 | 322 | session_descriptor = create_session_descriptor(session_name); |
b178f53e JG |
323 | if (!session_descriptor) { |
324 | ret = CMD_ERROR; | |
325 | goto error; | |
ecc48a90 | 326 | } |
b178f53e JG |
327 | ret_code = lttng_create_session_ext(session_descriptor); |
328 | if (ret_code != LTTNG_OK) { | |
329 | ERR("%s", lttng_strerror(-ret_code)); | |
ecc48a90 JD |
330 | ret = CMD_ERROR; |
331 | goto error; | |
332 | } | |
333 | ||
28ab034a JG |
334 | descriptor_status = lttng_session_descriptor_get_session_name(session_descriptor, |
335 | &created_session_name); | |
b178f53e JG |
336 | if (descriptor_status != LTTNG_SESSION_DESCRIPTOR_STATUS_OK) { |
337 | ERR("Failed to obtain created session name"); | |
338 | ret = CMD_ERROR; | |
339 | goto error; | |
16f6f820 | 340 | } |
b178f53e JG |
341 | |
342 | ret = lttng_list_sessions(&sessions); | |
f3ed775e | 343 | if (ret < 0) { |
28ab034a | 344 | ERR("Failed to fetch properties of created session: %s", lttng_strerror(ret)); |
b178f53e JG |
345 | ret = CMD_ERROR; |
346 | goto error; | |
347 | } | |
348 | for (i = 0; i < ret; i++) { | |
349 | if (!strcmp(created_session_name, sessions[i].name)) { | |
350 | created_session = &sessions[i]; | |
60e835ca | 351 | break; |
42224349 | 352 | } |
b178f53e JG |
353 | } |
354 | if (!created_session) { | |
355 | ERR("Failed to fetch properties of created session"); | |
356 | ret = CMD_ERROR; | |
f3ed775e DG |
357 | goto error; |
358 | } | |
359 | ||
b178f53e JG |
360 | if (opt_shm_path) { |
361 | char datetime_suffix[17] = {}; | |
362 | ||
363 | /* | |
364 | * An auto-generated session name already includes the creation | |
365 | * timestamp. | |
366 | */ | |
5b915816 | 367 | if (session_name) { |
b178f53e JG |
368 | uint64_t creation_time; |
369 | struct tm *timeinfo; | |
370 | time_t creation_time_t; | |
371 | size_t strftime_ret; | |
372 | ||
28ab034a | 373 | ret_code = lttng_session_get_creation_time(created_session, &creation_time); |
b178f53e JG |
374 | if (ret_code != LTTNG_OK) { |
375 | ERR("%s", lttng_strerror(-ret_code)); | |
376 | ret = CMD_ERROR; | |
377 | goto error; | |
378 | } | |
379 | creation_time_t = (time_t) creation_time; | |
380 | timeinfo = localtime(&creation_time_t); | |
381 | if (!timeinfo) { | |
382 | PERROR("Failed to interpret session creation time"); | |
383 | ret = CMD_ERROR; | |
384 | goto error; | |
385 | } | |
386 | strftime_ret = strftime(datetime_suffix, | |
28ab034a JG |
387 | sizeof(datetime_suffix), |
388 | "-%Y%m%d-%H%M%S", | |
389 | timeinfo); | |
b178f53e JG |
390 | if (strftime_ret == 0) { |
391 | ERR("Failed to format session creation time."); | |
392 | ret = CMD_ERROR; | |
393 | goto error; | |
394 | } | |
a4b92340 | 395 | } |
4f50c803 | 396 | |
28ab034a JG |
397 | ret = snprintf(shm_path, |
398 | sizeof(shm_path), | |
399 | "%s/%s%s", | |
400 | opt_shm_path, | |
401 | created_session_name, | |
402 | datetime_suffix); | |
b178f53e JG |
403 | if (ret < 0 || ret >= sizeof(shm_path)) { |
404 | ERR("Failed to format the shared memory path."); | |
405 | ret = CMD_ERROR; | |
d7ba1388 MD |
406 | goto error; |
407 | } | |
28ab034a | 408 | ret = lttng_set_session_shm_path(created_session_name, shm_path); |
d7ba1388 | 409 | if (ret < 0) { |
b178f53e JG |
410 | lttng_destroy_session(created_session_name); |
411 | ret = CMD_ERROR; | |
d7ba1388 MD |
412 | goto error; |
413 | } | |
414 | } | |
415 | ||
b178f53e JG |
416 | if (opt_snapshot) { |
417 | MSG("Snapshot session %s created.", created_session_name); | |
418 | } else if (opt_live_timer) { | |
419 | MSG("Live session %s created.", created_session_name); | |
420 | } else { | |
421 | MSG("Session %s created.", created_session_name); | |
422 | } | |
423 | ||
424 | if (*created_session->path && !opt_snapshot) { | |
425 | MSG("Traces will be output to %s", created_session->path); | |
d73c5802 DG |
426 | |
427 | if (opt_live_timer) { | |
28ab034a | 428 | MSG("Live timer interval set to %u %s", opt_live_timer, USEC_UNIT); |
d73c5802 | 429 | } |
16f6f820 | 430 | } else if (opt_snapshot) { |
b178f53e JG |
431 | struct lttng_snapshot_output_list *list; |
432 | struct lttng_snapshot_output *iter; | |
433 | char snapshot_url[LTTNG_PATH_MAX] = {}; | |
434 | ||
435 | ret = lttng_snapshot_list_output(created_session_name, &list); | |
436 | if (ret < 0) { | |
437 | ERR("Failed to list snapshot outputs."); | |
438 | ret = CMD_ERROR; | |
439 | goto error; | |
16f6f820 | 440 | } |
b178f53e JG |
441 | |
442 | while ((iter = lttng_snapshot_output_list_get_next(list))) { | |
443 | const char *url = NULL; | |
444 | ||
28ab034a JG |
445 | url = lttng_snapshot_output_get_ctrl_url(iter); |
446 | ret = lttng_strncpy(snapshot_url, url, sizeof(snapshot_url)); | |
b178f53e JG |
447 | if (ret) { |
448 | snapshot_url[0] = '\0'; | |
449 | ERR("Failed to retrieve snapshot output destination"); | |
450 | } | |
451 | break; | |
452 | } | |
453 | lttng_snapshot_output_list_destroy(list); | |
454 | ||
455 | if (*snapshot_url) { | |
28ab034a | 456 | MSG("Default snapshot output set to %s", snapshot_url); |
b178f53e JG |
457 | } |
458 | MSG("Every channel enabled for this session will be set to mmap output and default to overwrite mode."); | |
a4b92340 | 459 | } |
d7ba1388 | 460 | if (opt_shm_path) { |
b178f53e | 461 | MSG("Shared memory path set to %s", shm_path); |
d7ba1388 | 462 | } |
a4b92340 | 463 | |
37d03ff7 JRJ |
464 | /* Mi output */ |
465 | if (lttng_opt_mi) { | |
b178f53e | 466 | ret = mi_created_session(created_session_name); |
37d03ff7 JRJ |
467 | if (ret) { |
468 | ret = CMD_ERROR; | |
469 | goto error; | |
470 | } | |
471 | } | |
472 | ||
58a97671 | 473 | /* Init lttng session config */ |
b178f53e | 474 | ret = config_init(created_session_name); |
f3ed775e | 475 | if (ret < 0) { |
27089920 | 476 | ret = CMD_ERROR; |
f3ed775e DG |
477 | goto error; |
478 | } | |
479 | ||
f3ed775e | 480 | ret = CMD_SUCCESS; |
f3ed775e | 481 | error: |
b178f53e JG |
482 | lttng_session_descriptor_destroy(session_descriptor); |
483 | free(sessions); | |
f3ed775e DG |
484 | return ret; |
485 | } | |
486 | ||
92360082 JG |
487 | /* |
488 | * spawn_sessiond | |
489 | * | |
490 | * Spawn a session daemon by forking and execv. | |
491 | */ | |
b53d4e59 | 492 | static int spawn_sessiond(const char *pathname) |
92360082 JG |
493 | { |
494 | int ret = 0; | |
495 | pid_t pid; | |
496 | ||
497 | MSG("Spawning a session daemon"); | |
92360082 JG |
498 | pid = fork(); |
499 | if (pid == 0) { | |
500 | /* | |
bbd44cae | 501 | * Spawn session daemon in daemon mode. |
92360082 | 502 | */ |
28ab034a | 503 | execlp(pathname, "lttng-sessiond", "--daemonize", NULL); |
92360082 JG |
504 | /* execlp only returns if error happened */ |
505 | if (errno == ENOENT) { | |
506 | ERR("No session daemon found. Use --sessiond-path."); | |
507 | } else { | |
508 | PERROR("execlp"); | |
509 | } | |
28ab034a | 510 | kill(getppid(), SIGTERM); /* wake parent */ |
92360082 JG |
511 | exit(EXIT_FAILURE); |
512 | } else if (pid > 0) { | |
92360082 | 513 | /* |
bbd44cae PP |
514 | * In daemon mode (--daemonize), sessiond only exits when |
515 | * it's ready to accept commands. | |
92360082 | 516 | */ |
bbd44cae | 517 | for (;;) { |
81527d36 JG |
518 | int status; |
519 | pid_t wait_pid_ret = waitpid(pid, &status, 0); | |
520 | ||
521 | if (wait_pid_ret < 0) { | |
522 | if (errno == EINTR) { | |
523 | continue; | |
524 | } | |
525 | PERROR("waitpid"); | |
526 | ret = -errno; | |
527 | goto end; | |
528 | } | |
bbd44cae PP |
529 | |
530 | if (WIFSIGNALED(status)) { | |
28ab034a | 531 | ERR("Session daemon was killed by signal %d", WTERMSIG(status)); |
bbd44cae | 532 | ret = -1; |
28ab034a | 533 | goto end; |
bbd44cae PP |
534 | } else if (WIFEXITED(status)) { |
535 | DBG("Session daemon terminated normally (exit status: %d)", | |
28ab034a | 536 | WEXITSTATUS(status)); |
bbd44cae PP |
537 | |
538 | if (WEXITSTATUS(status) != 0) { | |
539 | ERR("Session daemon terminated with an error (exit status: %d)", | |
28ab034a | 540 | WEXITSTATUS(status)); |
bbd44cae | 541 | ret = -1; |
28ab034a | 542 | goto end; |
bbd44cae PP |
543 | } |
544 | break; | |
545 | } | |
92360082 | 546 | } |
bbd44cae | 547 | |
92360082 JG |
548 | goto end; |
549 | } else { | |
550 | PERROR("fork"); | |
551 | ret = -1; | |
552 | goto end; | |
553 | } | |
554 | ||
555 | end: | |
556 | return ret; | |
557 | } | |
558 | ||
559 | /* | |
560 | * launch_sessiond | |
561 | * | |
562 | * Check if the session daemon is available using | |
563 | * the liblttngctl API for the check. If not, try to | |
564 | * spawn a daemon. | |
565 | */ | |
566 | static int launch_sessiond(void) | |
567 | { | |
568 | int ret; | |
b53d4e59 | 569 | const char *pathname = NULL; |
92360082 JG |
570 | |
571 | ret = lttng_session_daemon_alive(); | |
572 | if (ret) { | |
573 | /* Sessiond is alive, not an error */ | |
574 | ret = 0; | |
575 | goto end; | |
576 | } | |
577 | ||
578 | /* Try command line option path */ | |
579 | pathname = opt_sessiond_path; | |
580 | ||
581 | /* Try LTTNG_SESSIOND_PATH env variable */ | |
582 | if (pathname == NULL) { | |
583 | pathname = getenv(DEFAULT_SESSIOND_PATH_ENV); | |
584 | } | |
585 | ||
586 | /* Try with configured path */ | |
587 | if (pathname == NULL) { | |
588 | if (CONFIG_SESSIOND_BIN[0] != '\0') { | |
589 | pathname = CONFIG_SESSIOND_BIN; | |
590 | } | |
591 | } | |
592 | ||
593 | /* Try the default path */ | |
594 | if (pathname == NULL) { | |
595 | pathname = INSTALL_BIN_PATH "/lttng-sessiond"; | |
596 | } | |
597 | ||
598 | DBG("Session daemon binary path: %s", pathname); | |
599 | ||
600 | /* Check existence and permissions */ | |
601 | ret = access(pathname, F_OK | X_OK); | |
602 | if (ret < 0) { | |
603 | ERR("No such file or access denied: %s", pathname); | |
604 | goto end; | |
605 | } | |
606 | ||
607 | ret = spawn_sessiond(pathname); | |
92360082 | 608 | end: |
0f4fa0d2 | 609 | if (ret) { |
28ab034a | 610 | ERR("Problem occurred while launching session daemon (%s)", pathname); |
0f4fa0d2 | 611 | } |
92360082 JG |
612 | return ret; |
613 | } | |
614 | ||
28ab034a | 615 | static int validate_url_option_combination(void) |
a8d119b5 JG |
616 | { |
617 | int ret = 0; | |
618 | int used_count = 0; | |
619 | ||
620 | used_count += !!opt_url; | |
621 | used_count += !!opt_output_path; | |
622 | used_count += (opt_data_url || opt_ctrl_url); | |
623 | if (used_count > 1) { | |
624 | ERR("Only one of the --set-url, --ctrl-url/data-url, or --output options may be used at once."); | |
625 | ret = -1; | |
626 | } | |
627 | ||
628 | return ret; | |
629 | } | |
630 | ||
f3ed775e | 631 | /* |
74cc1d0f | 632 | * The 'create <options>' first level command |
1c8d13c8 TD |
633 | * |
634 | * Returns one of the CMD_* result constants. | |
f3ed775e DG |
635 | */ |
636 | int cmd_create(int argc, const char **argv) | |
637 | { | |
37d03ff7 | 638 | int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1; |
ecc48a90 | 639 | char *opt_arg = NULL; |
5b915816 | 640 | const char *arg_session_name = NULL; |
68c7f6e5 | 641 | const char *leftover = NULL; |
f3ed775e DG |
642 | static poptContext pc; |
643 | ||
644 | pc = poptGetContext(NULL, argc, argv, long_options, 0); | |
645 | poptReadDefaultConfig(pc, 0); | |
646 | ||
647 | while ((opt = poptGetNextOpt(pc)) != -1) { | |
648 | switch (opt) { | |
649 | case OPT_HELP: | |
4ba92f18 | 650 | SHOW_HELP(); |
f3ed775e | 651 | goto end; |
679b4943 SM |
652 | case OPT_LIST_OPTIONS: |
653 | list_cmd_options(stdout, long_options); | |
679b4943 | 654 | goto end; |
ecc48a90 JD |
655 | case OPT_LIVE_TIMER: |
656 | { | |
c7219617 | 657 | uint64_t v; |
ecc48a90 JD |
658 | |
659 | errno = 0; | |
e2ecf532 JG |
660 | if (opt_arg) { |
661 | free(opt_arg); | |
662 | opt_arg = nullptr; | |
663 | } | |
664 | ||
ecc48a90 | 665 | opt_arg = poptGetOptArg(pc); |
d73c5802 DG |
666 | if (!opt_arg) { |
667 | /* Set up default values. */ | |
668 | opt_live_timer = (uint32_t) DEFAULT_LTTNG_LIVE_TIMER; | |
669 | DBG("Session live timer interval set to default value %d", | |
28ab034a | 670 | opt_live_timer); |
d73c5802 DG |
671 | break; |
672 | } | |
673 | ||
c7219617 SM |
674 | if (utils_parse_time_suffix(opt_arg, &v) < 0) { |
675 | ERR("Wrong value for --live parameter: %s", opt_arg); | |
ecc48a90 JD |
676 | ret = CMD_ERROR; |
677 | goto end; | |
678 | } | |
c7219617 | 679 | |
ecc48a90 JD |
680 | if (v != (uint32_t) v) { |
681 | ERR("32-bit overflow in --live parameter: %s", opt_arg); | |
682 | ret = CMD_ERROR; | |
683 | goto end; | |
684 | } | |
c7219617 | 685 | |
0ed9e0be JG |
686 | if (v == 0) { |
687 | ERR("Live timer interval must be greater than zero"); | |
688 | ret = CMD_ERROR; | |
689 | goto end; | |
690 | } | |
c7219617 | 691 | |
ecc48a90 JD |
692 | opt_live_timer = (uint32_t) v; |
693 | DBG("Session live timer interval set to %d", opt_live_timer); | |
694 | break; | |
695 | } | |
f3ed775e | 696 | default: |
f3ed775e DG |
697 | ret = CMD_UNDEFINED; |
698 | goto end; | |
699 | } | |
700 | } | |
701 | ||
785d2d0d | 702 | if (opt_no_consumer) { |
96fe6b8d | 703 | MSG("The option --no-consumer is obsolete. Use --no-output now."); |
785d2d0d DG |
704 | ret = CMD_WARNING; |
705 | goto end; | |
706 | } | |
707 | ||
a8d119b5 JG |
708 | ret = validate_url_option_combination(); |
709 | if (ret) { | |
710 | ret = CMD_ERROR; | |
711 | goto end; | |
712 | } | |
713 | ||
92360082 JG |
714 | /* Spawn a session daemon if needed */ |
715 | if (!opt_no_sessiond) { | |
716 | ret = launch_sessiond(); | |
717 | if (ret) { | |
718 | ret = CMD_ERROR; | |
719 | goto end; | |
720 | } | |
721 | } | |
722 | ||
acc09215 | 723 | /* MI initialization */ |
37d03ff7 JRJ |
724 | if (lttng_opt_mi) { |
725 | writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi); | |
726 | if (!writer) { | |
727 | ret = -LTTNG_ERR_NOMEM; | |
728 | goto end; | |
729 | } | |
730 | ||
731 | /* Open command element */ | |
28ab034a | 732 | ret = mi_lttng_writer_command_open(writer, mi_lttng_element_command_create); |
37d03ff7 JRJ |
733 | if (ret) { |
734 | ret = CMD_ERROR; | |
735 | goto end; | |
736 | } | |
737 | ||
738 | /* Open output element */ | |
28ab034a | 739 | ret = mi_lttng_writer_open_element(writer, mi_lttng_element_command_output); |
37d03ff7 JRJ |
740 | if (ret) { |
741 | ret = CMD_ERROR; | |
742 | goto end; | |
743 | } | |
744 | } | |
5b915816 MJ |
745 | |
746 | /* Get the optional session name argument. */ | |
747 | arg_session_name = poptGetArg(pc); | |
f3ed775e | 748 | |
68c7f6e5 JD |
749 | leftover = poptGetArg(pc); |
750 | if (leftover) { | |
751 | ERR("Unknown argument: %s", leftover); | |
752 | ret = CMD_ERROR; | |
753 | goto end; | |
754 | } | |
755 | ||
5b915816 | 756 | command_ret = create_session(arg_session_name); |
37d03ff7 JRJ |
757 | if (command_ret) { |
758 | success = 0; | |
759 | } | |
760 | ||
761 | if (lttng_opt_mi) { | |
762 | /* Close output element */ | |
763 | ret = mi_lttng_writer_close_element(writer); | |
764 | if (ret) { | |
765 | ret = CMD_ERROR; | |
766 | goto end; | |
767 | } | |
768 | ||
769 | /* Success ? */ | |
28ab034a JG |
770 | ret = mi_lttng_writer_write_element_bool( |
771 | writer, mi_lttng_element_command_success, success); | |
37d03ff7 JRJ |
772 | if (ret) { |
773 | ret = CMD_ERROR; | |
774 | goto end; | |
775 | } | |
776 | ||
777 | /* Command element close */ | |
778 | ret = mi_lttng_writer_command_close(writer); | |
779 | if (ret) { | |
780 | ret = CMD_ERROR; | |
781 | goto end; | |
782 | } | |
783 | } | |
f3ed775e DG |
784 | |
785 | end: | |
37d03ff7 JRJ |
786 | /* Mi clean-up */ |
787 | if (writer && mi_lttng_writer_destroy(writer)) { | |
788 | /* Preserve original error code */ | |
789 | ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL; | |
790 | } | |
791 | ||
acc09215 | 792 | /* Overwrite ret if an error occurred in create_session() */ |
37d03ff7 JRJ |
793 | ret = command_ret ? command_ret : ret; |
794 | ||
e2ecf532 | 795 | free(opt_arg); |
ca1c3607 | 796 | poptFreeContext(pc); |
f3ed775e DG |
797 | return ret; |
798 | } |