Commit | Line | Data |
---|---|---|
826d496d | 1 | /* |
82a3637f DG |
2 | * liblttngctl.c |
3 | * | |
4 | * Linux Trace Toolkit Control Library | |
5 | * | |
826d496d | 6 | * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca> |
fac6795d | 7 | * |
d14d33bf AM |
8 | * This library is free software; you can redistribute it and/or modify it |
9 | * under the terms of the GNU Lesser General Public License, version 2.1 only, | |
10 | * as published by the Free Software Foundation. | |
82a3637f DG |
11 | * |
12 | * This library is distributed in the hope that it will be useful, | |
fac6795d | 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
82a3637f DG |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
15 | * Lesser General Public License for more details. | |
16 | * | |
d14d33bf AM |
17 | * You should have received a copy of the GNU Lesser General Public License |
18 | * along with this library; if not, write to the Free Software Foundation, | |
19 | * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
fac6795d DG |
20 | */ |
21 | ||
22 | #define _GNU_SOURCE | |
44a5e5eb | 23 | #include <assert.h> |
fac6795d | 24 | #include <grp.h> |
1e307fab | 25 | #include <errno.h> |
fac6795d DG |
26 | #include <stdio.h> |
27 | #include <stdlib.h> | |
28 | #include <string.h> | |
29 | #include <unistd.h> | |
30 | ||
990570ed DG |
31 | #include <common/common.h> |
32 | #include <common/defaults.h> | |
db758600 | 33 | #include <common/sessiond-comm/sessiond-comm.h> |
a4b92340 | 34 | #include <common/uri.h> |
1e307fab | 35 | #include <lttng/lttng.h> |
fac6795d | 36 | |
d00c599e DG |
37 | #include "filter/filter-ast.h" |
38 | #include "filter/filter-parser.h" | |
39 | #include "filter/filter-bytecode.h" | |
40 | #include "filter/memstream.h" | |
53a80697 MD |
41 | |
42 | #ifdef DEBUG | |
d00c599e | 43 | static const int print_xml = 1; |
53a80697 MD |
44 | #define dbg_printf(fmt, args...) \ |
45 | printf("[debug liblttng-ctl] " fmt, ## args) | |
46 | #else | |
d00c599e | 47 | static const int print_xml = 0; |
53a80697 MD |
48 | #define dbg_printf(fmt, args...) \ |
49 | do { \ | |
50 | /* do nothing but check printf format */ \ | |
51 | if (0) \ | |
52 | printf("[debug liblttnctl] " fmt, ## args); \ | |
53 | } while (0) | |
54 | #endif | |
55 | ||
56 | ||
fac6795d DG |
57 | /* Socket to session daemon for communication */ |
58 | static int sessiond_socket; | |
59 | static char sessiond_sock_path[PATH_MAX]; | |
44a5e5eb | 60 | static char health_sock_path[PATH_MAX]; |
fac6795d | 61 | |
fac6795d DG |
62 | /* Variables */ |
63 | static char *tracing_group; | |
64 | static int connected; | |
65 | ||
97e19046 DG |
66 | /* Global */ |
67 | ||
68 | /* | |
69 | * Those two variables are used by error.h to silent or control the verbosity of | |
70 | * error message. They are global to the library so application linking with it | |
71 | * are able to compile correctly and also control verbosity of the library. | |
97e19046 DG |
72 | */ |
73 | int lttng_opt_quiet; | |
74 | int lttng_opt_verbose; | |
75 | ||
4f50c803 DG |
76 | /* |
77 | * Compare two URL destination. | |
78 | * | |
79 | * Return 0 is equal else is not equal. | |
80 | */ | |
81 | static int compare_destination(struct lttng_uri *ctrl, struct lttng_uri *data) | |
82 | { | |
83 | int ret; | |
84 | ||
85 | assert(ctrl); | |
86 | assert(data); | |
87 | ||
88 | switch (ctrl->dtype) { | |
89 | case LTTNG_DST_IPV4: | |
90 | ret = strncmp(ctrl->dst.ipv4, data->dst.ipv4, sizeof(ctrl->dst.ipv4)); | |
91 | break; | |
92 | case LTTNG_DST_IPV6: | |
93 | ret = strncmp(ctrl->dst.ipv6, data->dst.ipv6, sizeof(ctrl->dst.ipv6)); | |
94 | break; | |
95 | default: | |
96 | ret = -1; | |
97 | break; | |
98 | } | |
99 | ||
100 | return ret; | |
101 | } | |
102 | ||
a4b92340 DG |
103 | static void set_default_url_attr(struct lttng_uri *uri, |
104 | enum lttng_stream_type stype) | |
105 | { | |
106 | uri->stype = stype; | |
107 | if (uri->dtype != LTTNG_DST_PATH && uri->port == 0) { | |
108 | uri->port = (stype == LTTNG_STREAM_CONTROL) ? | |
109 | DEFAULT_NETWORK_CONTROL_PORT : DEFAULT_NETWORK_DATA_PORT; | |
110 | } | |
111 | } | |
112 | ||
113 | /* | |
114 | * Parse a string URL and creates URI(s) returning the size of the populated | |
115 | * array. | |
116 | */ | |
117 | static ssize_t parse_str_urls_to_uri(const char *ctrl_url, const char *data_url, | |
118 | struct lttng_uri **uris) | |
119 | { | |
a4b92340 DG |
120 | unsigned int equal = 1, idx = 0; |
121 | /* Add the "file://" size to the URL maximum size */ | |
122 | char url[PATH_MAX + 7]; | |
123 | ssize_t size_ctrl = 0, size_data = 0, size; | |
124 | struct lttng_uri *ctrl_uris = NULL, *data_uris = NULL; | |
125 | struct lttng_uri *tmp_uris = NULL; | |
126 | ||
127 | /* No URL(s) is allowed. This means that the consumer will be disabled. */ | |
128 | if (ctrl_url == NULL && data_url == NULL) { | |
129 | return 0; | |
130 | } | |
131 | ||
132 | /* Check if URLs are equal and if so, only use the control URL */ | |
133 | if (ctrl_url && data_url) { | |
134 | equal = !strcmp(ctrl_url, data_url); | |
135 | } | |
136 | ||
137 | /* | |
138 | * Since we allow the str_url to be a full local filesystem path, we are | |
139 | * going to create a valid file:// URL if it's the case. | |
140 | * | |
141 | * Check if first character is a '/' or else reject the URL. | |
142 | */ | |
143 | if (ctrl_url && ctrl_url[0] == '/') { | |
c617c0c6 MD |
144 | int ret; |
145 | ||
a4b92340 DG |
146 | ret = snprintf(url, sizeof(url), "file://%s", ctrl_url); |
147 | if (ret < 0) { | |
148 | PERROR("snprintf file url"); | |
149 | goto parse_error; | |
150 | } | |
151 | ctrl_url = url; | |
152 | } | |
153 | ||
154 | /* Parse the control URL if there is one */ | |
155 | if (ctrl_url) { | |
156 | size_ctrl = uri_parse(ctrl_url, &ctrl_uris); | |
157 | if (size_ctrl < 1) { | |
158 | ERR("Unable to parse the URL %s", ctrl_url); | |
159 | goto parse_error; | |
160 | } | |
161 | ||
162 | /* At this point, we know there is at least one URI in the array */ | |
163 | set_default_url_attr(&ctrl_uris[0], LTTNG_STREAM_CONTROL); | |
164 | ||
165 | if (ctrl_uris[0].dtype == LTTNG_DST_PATH && data_url) { | |
166 | ERR("Can not have a data URL when destination is file://"); | |
167 | goto error; | |
168 | } | |
169 | ||
170 | /* URL are not equal but the control URL uses a net:// protocol */ | |
171 | if (size_ctrl == 2) { | |
172 | if (!equal) { | |
173 | ERR("Control URL uses the net:// protocol and the data URL is " | |
174 | "different. Not allowed."); | |
175 | goto error; | |
176 | } else { | |
177 | set_default_url_attr(&ctrl_uris[1], LTTNG_STREAM_DATA); | |
178 | /* | |
179 | * The data_url and ctrl_url are equal and the ctrl_url | |
180 | * contains a net:// protocol so we just skip the data part. | |
181 | */ | |
182 | data_url = NULL; | |
183 | } | |
184 | } | |
185 | } | |
186 | ||
187 | if (data_url) { | |
4f50c803 DG |
188 | int ret; |
189 | ||
a4b92340 DG |
190 | /* We have to parse the data URL in this case */ |
191 | size_data = uri_parse(data_url, &data_uris); | |
192 | if (size_data < 1) { | |
193 | ERR("Unable to parse the URL %s", data_url); | |
194 | goto error; | |
195 | } else if (size_data == 2) { | |
196 | ERR("Data URL can not be set with the net[4|6]:// protocol"); | |
197 | goto error; | |
198 | } | |
199 | ||
200 | set_default_url_attr(&data_uris[0], LTTNG_STREAM_DATA); | |
4f50c803 DG |
201 | |
202 | ret = compare_destination(&ctrl_uris[0], &data_uris[0]); | |
203 | if (ret != 0) { | |
204 | ERR("Control and data destination mismatch"); | |
205 | goto error; | |
206 | } | |
a4b92340 DG |
207 | } |
208 | ||
209 | /* Compute total size */ | |
210 | size = size_ctrl + size_data; | |
211 | ||
212 | tmp_uris = zmalloc(sizeof(struct lttng_uri) * size); | |
213 | if (tmp_uris == NULL) { | |
214 | PERROR("zmalloc uris"); | |
215 | goto error; | |
216 | } | |
217 | ||
218 | if (ctrl_uris) { | |
219 | /* It's possible the control URIs array contains more than one URI */ | |
220 | memcpy(tmp_uris, ctrl_uris, sizeof(struct lttng_uri) * size_ctrl); | |
221 | ++idx; | |
3dd05a85 | 222 | free(ctrl_uris); |
a4b92340 DG |
223 | } |
224 | ||
225 | if (data_uris) { | |
226 | memcpy(&tmp_uris[idx], data_uris, sizeof(struct lttng_uri)); | |
3dd05a85 | 227 | free(data_uris); |
a4b92340 DG |
228 | } |
229 | ||
230 | *uris = tmp_uris; | |
231 | ||
232 | return size; | |
233 | ||
234 | error: | |
235 | free(ctrl_uris); | |
236 | free(data_uris); | |
237 | free(tmp_uris); | |
238 | parse_error: | |
239 | return -1; | |
240 | } | |
241 | ||
99497cd0 MD |
242 | /* |
243 | * Copy string from src to dst and enforce null terminated byte. | |
244 | */ | |
245 | static void copy_string(char *dst, const char *src, size_t len) | |
246 | { | |
e7d6716d | 247 | if (src && dst) { |
99497cd0 MD |
248 | strncpy(dst, src, len); |
249 | /* Enforce the NULL terminated byte */ | |
250 | dst[len - 1] = '\0'; | |
cd80958d DG |
251 | } else if (dst) { |
252 | dst[0] = '\0'; | |
99497cd0 MD |
253 | } |
254 | } | |
255 | ||
fac6795d | 256 | /* |
cd80958d | 257 | * Copy domain to lttcomm_session_msg domain. |
fac6795d | 258 | * |
cd80958d DG |
259 | * If domain is unknown, default domain will be the kernel. |
260 | */ | |
261 | static void copy_lttng_domain(struct lttng_domain *dst, struct lttng_domain *src) | |
262 | { | |
263 | if (src && dst) { | |
264 | switch (src->type) { | |
00e2e675 DG |
265 | case LTTNG_DOMAIN_KERNEL: |
266 | case LTTNG_DOMAIN_UST: | |
267 | /* | |
268 | case LTTNG_DOMAIN_UST_EXEC_NAME: | |
269 | case LTTNG_DOMAIN_UST_PID: | |
270 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: | |
271 | */ | |
272 | memcpy(dst, src, sizeof(struct lttng_domain)); | |
273 | break; | |
274 | default: | |
275 | memset(dst, 0, sizeof(struct lttng_domain)); | |
00e2e675 | 276 | break; |
cd80958d DG |
277 | } |
278 | } | |
279 | } | |
280 | ||
281 | /* | |
282 | * Send lttcomm_session_msg to the session daemon. | |
fac6795d | 283 | * |
1c8d13c8 TD |
284 | * On success, returns the number of bytes sent (>=0) |
285 | * On error, returns -1 | |
fac6795d | 286 | */ |
cd80958d | 287 | static int send_session_msg(struct lttcomm_session_msg *lsm) |
fac6795d DG |
288 | { |
289 | int ret; | |
290 | ||
291 | if (!connected) { | |
2f70b271 | 292 | ret = -LTTNG_ERR_NO_SESSIOND; |
e065084a | 293 | goto end; |
fac6795d DG |
294 | } |
295 | ||
a4b92340 DG |
296 | DBG("LSM cmd type : %d", lsm->cmd_type); |
297 | ||
be040666 | 298 | ret = lttcomm_send_creds_unix_sock(sessiond_socket, lsm, |
cd80958d | 299 | sizeof(struct lttcomm_session_msg)); |
2f70b271 DG |
300 | if (ret < 0) { |
301 | ret = -LTTNG_ERR_FATAL; | |
302 | } | |
e065084a DG |
303 | |
304 | end: | |
305 | return ret; | |
306 | } | |
307 | ||
53a80697 MD |
308 | /* |
309 | * Send var len data to the session daemon. | |
310 | * | |
311 | * On success, returns the number of bytes sent (>=0) | |
312 | * On error, returns -1 | |
313 | */ | |
314 | static int send_session_varlen(void *data, size_t len) | |
315 | { | |
316 | int ret; | |
317 | ||
318 | if (!connected) { | |
2f70b271 | 319 | ret = -LTTNG_ERR_NO_SESSIOND; |
53a80697 MD |
320 | goto end; |
321 | } | |
a4b92340 | 322 | |
53a80697 MD |
323 | if (!data || !len) { |
324 | ret = 0; | |
325 | goto end; | |
326 | } | |
327 | ||
328 | ret = lttcomm_send_unix_sock(sessiond_socket, data, len); | |
2f70b271 DG |
329 | if (ret < 0) { |
330 | ret = -LTTNG_ERR_FATAL; | |
331 | } | |
53a80697 MD |
332 | |
333 | end: | |
334 | return ret; | |
335 | } | |
336 | ||
e065084a | 337 | /* |
cd80958d | 338 | * Receive data from the sessiond socket. |
e065084a | 339 | * |
1c8d13c8 TD |
340 | * On success, returns the number of bytes received (>=0) |
341 | * On error, returns -1 (recvmsg() error) or -ENOTCONN | |
e065084a | 342 | */ |
ca95a216 | 343 | static int recv_data_sessiond(void *buf, size_t len) |
e065084a DG |
344 | { |
345 | int ret; | |
346 | ||
347 | if (!connected) { | |
2f70b271 | 348 | ret = -LTTNG_ERR_NO_SESSIOND; |
e065084a | 349 | goto end; |
fac6795d DG |
350 | } |
351 | ||
ca95a216 | 352 | ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len); |
2f70b271 DG |
353 | if (ret < 0) { |
354 | ret = -LTTNG_ERR_FATAL; | |
355 | } | |
fac6795d | 356 | |
e065084a | 357 | end: |
fac6795d DG |
358 | return ret; |
359 | } | |
360 | ||
361 | /* | |
1c8d13c8 | 362 | * Check if we are in the specified group. |
65beb5ff | 363 | * |
2269e89e | 364 | * If yes return 1, else return -1. |
947308c4 DG |
365 | */ |
366 | static int check_tracing_group(const char *grp_name) | |
367 | { | |
368 | struct group *grp_tracing; /* no free(). See getgrnam(3) */ | |
369 | gid_t *grp_list; | |
370 | int grp_list_size, grp_id, i; | |
371 | int ret = -1; | |
372 | ||
373 | /* Get GID of group 'tracing' */ | |
374 | grp_tracing = getgrnam(grp_name); | |
b4d8603b MD |
375 | if (!grp_tracing) { |
376 | /* If grp_tracing is NULL, the group does not exist. */ | |
947308c4 DG |
377 | goto end; |
378 | } | |
379 | ||
380 | /* Get number of supplementary group IDs */ | |
381 | grp_list_size = getgroups(0, NULL); | |
382 | if (grp_list_size < 0) { | |
383 | perror("getgroups"); | |
384 | goto end; | |
385 | } | |
386 | ||
387 | /* Alloc group list of the right size */ | |
388 | grp_list = malloc(grp_list_size * sizeof(gid_t)); | |
00795392 | 389 | if (!grp_list) { |
1c8d13c8 | 390 | perror("malloc"); |
00795392 MD |
391 | goto end; |
392 | } | |
947308c4 | 393 | grp_id = getgroups(grp_list_size, grp_list); |
1c8d13c8 | 394 | if (grp_id < 0) { |
947308c4 DG |
395 | perror("getgroups"); |
396 | goto free_list; | |
397 | } | |
398 | ||
399 | for (i = 0; i < grp_list_size; i++) { | |
400 | if (grp_list[i] == grp_tracing->gr_gid) { | |
2269e89e | 401 | ret = 1; |
947308c4 DG |
402 | break; |
403 | } | |
404 | } | |
405 | ||
406 | free_list: | |
407 | free(grp_list); | |
408 | ||
409 | end: | |
410 | return ret; | |
411 | } | |
412 | ||
413 | /* | |
2269e89e DG |
414 | * Try connect to session daemon with sock_path. |
415 | * | |
416 | * Return 0 on success, else -1 | |
417 | */ | |
418 | static int try_connect_sessiond(const char *sock_path) | |
419 | { | |
420 | int ret; | |
421 | ||
422 | /* If socket exist, we check if the daemon listens for connect. */ | |
423 | ret = access(sock_path, F_OK); | |
424 | if (ret < 0) { | |
425 | /* Not alive */ | |
2f70b271 | 426 | goto error; |
2269e89e DG |
427 | } |
428 | ||
429 | ret = lttcomm_connect_unix_sock(sock_path); | |
430 | if (ret < 0) { | |
431 | /* Not alive */ | |
2f70b271 | 432 | goto error; |
2269e89e DG |
433 | } |
434 | ||
435 | ret = lttcomm_close_unix_sock(ret); | |
436 | if (ret < 0) { | |
437 | perror("lttcomm_close_unix_sock"); | |
438 | } | |
439 | ||
440 | return 0; | |
2f70b271 DG |
441 | |
442 | error: | |
443 | return -1; | |
2269e89e DG |
444 | } |
445 | ||
446 | /* | |
2f70b271 DG |
447 | * Set sessiond socket path by putting it in the global sessiond_sock_path |
448 | * variable. | |
449 | * | |
450 | * Returns 0 on success, negative value on failure (the sessiond socket path | |
451 | * is somehow too long or ENOMEM). | |
947308c4 DG |
452 | */ |
453 | static int set_session_daemon_path(void) | |
454 | { | |
2269e89e DG |
455 | int in_tgroup = 0; /* In tracing group */ |
456 | uid_t uid; | |
457 | ||
458 | uid = getuid(); | |
947308c4 | 459 | |
2269e89e DG |
460 | if (uid != 0) { |
461 | /* Are we in the tracing group ? */ | |
462 | in_tgroup = check_tracing_group(tracing_group); | |
463 | } | |
464 | ||
08a9c49f TD |
465 | if ((uid == 0) || in_tgroup) { |
466 | copy_string(sessiond_sock_path, DEFAULT_GLOBAL_CLIENT_UNIX_SOCK, | |
2269e89e | 467 | sizeof(sessiond_sock_path)); |
08a9c49f | 468 | } |
2269e89e | 469 | |
08a9c49f | 470 | if (uid != 0) { |
c617c0c6 MD |
471 | int ret; |
472 | ||
08a9c49f TD |
473 | if (in_tgroup) { |
474 | /* Tracing group */ | |
475 | ret = try_connect_sessiond(sessiond_sock_path); | |
476 | if (ret >= 0) { | |
477 | goto end; | |
2269e89e | 478 | } |
08a9c49f | 479 | /* Global session daemon not available... */ |
2269e89e | 480 | } |
08a9c49f TD |
481 | /* ...or not in tracing group (and not root), default */ |
482 | ||
483 | /* | |
484 | * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small; | |
485 | * With GNU C >= 2.1, snprintf returns the required size (excluding closing null) | |
486 | */ | |
487 | ret = snprintf(sessiond_sock_path, sizeof(sessiond_sock_path), | |
488 | DEFAULT_HOME_CLIENT_UNIX_SOCK, getenv("HOME")); | |
489 | if ((ret < 0) || (ret >= sizeof(sessiond_sock_path))) { | |
2f70b271 | 490 | goto error; |
947308c4 | 491 | } |
947308c4 | 492 | } |
08a9c49f | 493 | end: |
947308c4 | 494 | return 0; |
2f70b271 DG |
495 | |
496 | error: | |
497 | return -1; | |
947308c4 DG |
498 | } |
499 | ||
65beb5ff DG |
500 | /* |
501 | * Connect to the LTTng session daemon. | |
502 | * | |
503 | * On success, return 0. On error, return -1. | |
504 | */ | |
505 | static int connect_sessiond(void) | |
506 | { | |
507 | int ret; | |
508 | ||
509 | ret = set_session_daemon_path(); | |
510 | if (ret < 0) { | |
2f70b271 | 511 | goto error; |
65beb5ff DG |
512 | } |
513 | ||
514 | /* Connect to the sesssion daemon */ | |
515 | ret = lttcomm_connect_unix_sock(sessiond_sock_path); | |
516 | if (ret < 0) { | |
2f70b271 | 517 | goto error; |
65beb5ff DG |
518 | } |
519 | ||
520 | sessiond_socket = ret; | |
521 | connected = 1; | |
522 | ||
523 | return 0; | |
2f70b271 DG |
524 | |
525 | error: | |
526 | return -1; | |
65beb5ff DG |
527 | } |
528 | ||
529 | /* | |
1c8d13c8 TD |
530 | * Clean disconnect from the session daemon. |
531 | * On success, return 0. On error, return -1. | |
65beb5ff DG |
532 | */ |
533 | static int disconnect_sessiond(void) | |
534 | { | |
535 | int ret = 0; | |
536 | ||
537 | if (connected) { | |
538 | ret = lttcomm_close_unix_sock(sessiond_socket); | |
539 | sessiond_socket = 0; | |
540 | connected = 0; | |
541 | } | |
542 | ||
543 | return ret; | |
544 | } | |
545 | ||
35a6fdb7 | 546 | /* |
cd80958d | 547 | * Ask the session daemon a specific command and put the data into buf. |
53a80697 | 548 | * Takes extra var. len. data as input to send to the session daemon. |
65beb5ff | 549 | * |
af87c45a | 550 | * Return size of data (only payload, not header) or a negative error code. |
65beb5ff | 551 | */ |
53a80697 | 552 | static int ask_sessiond_varlen(struct lttcomm_session_msg *lsm, |
a4b92340 | 553 | void *vardata, size_t varlen, void **buf) |
65beb5ff DG |
554 | { |
555 | int ret; | |
556 | size_t size; | |
557 | void *data = NULL; | |
cd80958d | 558 | struct lttcomm_lttng_msg llm; |
65beb5ff DG |
559 | |
560 | ret = connect_sessiond(); | |
561 | if (ret < 0) { | |
2f70b271 | 562 | ret = -LTTNG_ERR_NO_SESSIOND; |
65beb5ff DG |
563 | goto end; |
564 | } | |
565 | ||
65beb5ff | 566 | /* Send command to session daemon */ |
cd80958d | 567 | ret = send_session_msg(lsm); |
65beb5ff | 568 | if (ret < 0) { |
2f70b271 | 569 | /* Ret value is a valid lttng error code. */ |
65beb5ff DG |
570 | goto end; |
571 | } | |
53a80697 MD |
572 | /* Send var len data */ |
573 | ret = send_session_varlen(vardata, varlen); | |
574 | if (ret < 0) { | |
2f70b271 | 575 | /* Ret value is a valid lttng error code. */ |
53a80697 MD |
576 | goto end; |
577 | } | |
65beb5ff DG |
578 | |
579 | /* Get header from data transmission */ | |
580 | ret = recv_data_sessiond(&llm, sizeof(llm)); | |
581 | if (ret < 0) { | |
2f70b271 | 582 | /* Ret value is a valid lttng error code. */ |
65beb5ff DG |
583 | goto end; |
584 | } | |
585 | ||
586 | /* Check error code if OK */ | |
f73fabfd | 587 | if (llm.ret_code != LTTNG_OK) { |
65beb5ff DG |
588 | ret = -llm.ret_code; |
589 | goto end; | |
590 | } | |
591 | ||
592 | size = llm.data_size; | |
593 | if (size == 0) { | |
874d3f84 | 594 | /* If client free with size 0 */ |
a45d5536 DG |
595 | if (buf != NULL) { |
596 | *buf = NULL; | |
597 | } | |
7d29a247 | 598 | ret = 0; |
65beb5ff DG |
599 | goto end; |
600 | } | |
601 | ||
602 | data = (void*) malloc(size); | |
603 | ||
604 | /* Get payload data */ | |
605 | ret = recv_data_sessiond(data, size); | |
606 | if (ret < 0) { | |
607 | free(data); | |
608 | goto end; | |
609 | } | |
610 | ||
83009e5e DG |
611 | /* |
612 | * Extra protection not to dereference a NULL pointer. If buf is NULL at | |
613 | * this point, an error is returned and data is freed. | |
614 | */ | |
615 | if (buf == NULL) { | |
2f70b271 | 616 | ret = -LTTNG_ERR_INVALID; |
83009e5e DG |
617 | free(data); |
618 | goto end; | |
619 | } | |
620 | ||
65beb5ff DG |
621 | *buf = data; |
622 | ret = size; | |
623 | ||
624 | end: | |
625 | disconnect_sessiond(); | |
626 | return ret; | |
627 | } | |
628 | ||
53a80697 MD |
629 | /* |
630 | * Ask the session daemon a specific command and put the data into buf. | |
631 | * | |
632 | * Return size of data (only payload, not header) or a negative error code. | |
633 | */ | |
634 | static int ask_sessiond(struct lttcomm_session_msg *lsm, void **buf) | |
635 | { | |
636 | return ask_sessiond_varlen(lsm, NULL, 0, buf); | |
637 | } | |
638 | ||
9f19cc17 | 639 | /* |
cd80958d | 640 | * Create lttng handle and return pointer. |
1c8d13c8 | 641 | * The returned pointer will be NULL in case of malloc() error. |
9f19cc17 | 642 | */ |
cd80958d DG |
643 | struct lttng_handle *lttng_create_handle(const char *session_name, |
644 | struct lttng_domain *domain) | |
9f19cc17 | 645 | { |
2f70b271 DG |
646 | struct lttng_handle *handle = NULL; |
647 | ||
648 | if (domain == NULL) { | |
649 | goto end; | |
650 | } | |
cd80958d DG |
651 | |
652 | handle = malloc(sizeof(struct lttng_handle)); | |
653 | if (handle == NULL) { | |
2f70b271 | 654 | PERROR("malloc handle"); |
cd80958d DG |
655 | goto end; |
656 | } | |
657 | ||
658 | /* Copy session name */ | |
659 | copy_string(handle->session_name, session_name, | |
660 | sizeof(handle->session_name)); | |
661 | ||
662 | /* Copy lttng domain */ | |
663 | copy_lttng_domain(&handle->domain, domain); | |
664 | ||
665 | end: | |
666 | return handle; | |
667 | } | |
668 | ||
669 | /* | |
670 | * Destroy handle by free(3) the pointer. | |
671 | */ | |
672 | void lttng_destroy_handle(struct lttng_handle *handle) | |
673 | { | |
0e428499 | 674 | free(handle); |
eb354453 DG |
675 | } |
676 | ||
d9800920 DG |
677 | /* |
678 | * Register an outside consumer. | |
1c8d13c8 | 679 | * Returns size of returned session payload data or a negative error code. |
d9800920 DG |
680 | */ |
681 | int lttng_register_consumer(struct lttng_handle *handle, | |
682 | const char *socket_path) | |
683 | { | |
684 | struct lttcomm_session_msg lsm; | |
685 | ||
2f70b271 DG |
686 | if (handle == NULL || socket_path == NULL) { |
687 | return -LTTNG_ERR_INVALID; | |
688 | } | |
689 | ||
d9800920 DG |
690 | lsm.cmd_type = LTTNG_REGISTER_CONSUMER; |
691 | copy_string(lsm.session.name, handle->session_name, | |
692 | sizeof(lsm.session.name)); | |
693 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
694 | ||
695 | copy_string(lsm.u.reg.path, socket_path, sizeof(lsm.u.reg.path)); | |
696 | ||
697 | return ask_sessiond(&lsm, NULL); | |
698 | } | |
699 | ||
1df4dedd | 700 | /* |
1c8d13c8 TD |
701 | * Start tracing for all traces of the session. |
702 | * Returns size of returned session payload data or a negative error code. | |
1df4dedd | 703 | */ |
6a4f824d | 704 | int lttng_start_tracing(const char *session_name) |
f3ed775e | 705 | { |
cd80958d DG |
706 | struct lttcomm_session_msg lsm; |
707 | ||
6a4f824d | 708 | if (session_name == NULL) { |
2f70b271 | 709 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
710 | } |
711 | ||
712 | lsm.cmd_type = LTTNG_START_TRACE; | |
6a4f824d DG |
713 | |
714 | copy_string(lsm.session.name, session_name, sizeof(lsm.session.name)); | |
cd80958d DG |
715 | |
716 | return ask_sessiond(&lsm, NULL); | |
f3ed775e | 717 | } |
1df4dedd DG |
718 | |
719 | /* | |
38ee087f | 720 | * Stop tracing for all traces of the session. |
f3ed775e | 721 | */ |
38ee087f | 722 | static int _lttng_stop_tracing(const char *session_name, int wait) |
f3ed775e | 723 | { |
38ee087f | 724 | int ret, data_ret; |
cd80958d DG |
725 | struct lttcomm_session_msg lsm; |
726 | ||
6a4f824d | 727 | if (session_name == NULL) { |
2f70b271 | 728 | return -LTTNG_ERR_INVALID; |
6a4f824d DG |
729 | } |
730 | ||
cd80958d | 731 | lsm.cmd_type = LTTNG_STOP_TRACE; |
6a4f824d DG |
732 | |
733 | copy_string(lsm.session.name, session_name, sizeof(lsm.session.name)); | |
cd80958d | 734 | |
38ee087f DG |
735 | ret = ask_sessiond(&lsm, NULL); |
736 | if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) { | |
737 | goto error; | |
738 | } | |
739 | ||
740 | if (!wait) { | |
741 | goto end; | |
742 | } | |
743 | ||
744 | _MSG("Waiting for data availability"); | |
745 | ||
746 | /* Check for data availability */ | |
747 | do { | |
6d805429 | 748 | data_ret = lttng_data_pending(session_name); |
38ee087f DG |
749 | if (data_ret < 0) { |
750 | /* Return the data available call error. */ | |
751 | ret = data_ret; | |
752 | goto error; | |
753 | } | |
754 | ||
755 | /* | |
756 | * Data sleep time before retrying (in usec). Don't sleep if the call | |
757 | * returned value indicates availability. | |
758 | */ | |
6d805429 | 759 | if (data_ret) { |
38ee087f DG |
760 | usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME); |
761 | _MSG("."); | |
762 | } | |
6d805429 | 763 | } while (data_ret != 0); |
38ee087f DG |
764 | |
765 | MSG(""); | |
766 | ||
767 | end: | |
768 | error: | |
769 | return ret; | |
770 | } | |
771 | ||
772 | /* | |
773 | * Stop tracing and wait for data availability. | |
774 | */ | |
775 | int lttng_stop_tracing(const char *session_name) | |
776 | { | |
777 | return _lttng_stop_tracing(session_name, 1); | |
778 | } | |
779 | ||
780 | /* | |
781 | * Stop tracing but _don't_ wait for data availability. | |
782 | */ | |
783 | int lttng_stop_tracing_no_wait(const char *session_name) | |
784 | { | |
785 | return _lttng_stop_tracing(session_name, 0); | |
f3ed775e DG |
786 | } |
787 | ||
788 | /* | |
601d5acf DG |
789 | * Add context to a channel. |
790 | * | |
791 | * If the given channel is NULL, add the contexts to all channels. | |
792 | * The event_name param is ignored. | |
af87c45a DG |
793 | * |
794 | * Returns the size of the returned payload data or a negative error code. | |
1df4dedd | 795 | */ |
cd80958d | 796 | int lttng_add_context(struct lttng_handle *handle, |
38057ed1 DG |
797 | struct lttng_event_context *ctx, const char *event_name, |
798 | const char *channel_name) | |
d65106b1 | 799 | { |
cd80958d DG |
800 | struct lttcomm_session_msg lsm; |
801 | ||
9d697d3d DG |
802 | /* Safety check. Both are mandatory */ |
803 | if (handle == NULL || ctx == NULL) { | |
2f70b271 | 804 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
805 | } |
806 | ||
441c16a7 MD |
807 | memset(&lsm, 0, sizeof(lsm)); |
808 | ||
cd80958d DG |
809 | lsm.cmd_type = LTTNG_ADD_CONTEXT; |
810 | ||
811 | /* Copy channel name */ | |
812 | copy_string(lsm.u.context.channel_name, channel_name, | |
813 | sizeof(lsm.u.context.channel_name)); | |
cd80958d DG |
814 | |
815 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
d65106b1 | 816 | |
9d697d3d | 817 | memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context)); |
d65106b1 | 818 | |
cd80958d DG |
819 | copy_string(lsm.session.name, handle->session_name, |
820 | sizeof(lsm.session.name)); | |
821 | ||
822 | return ask_sessiond(&lsm, NULL); | |
d65106b1 DG |
823 | } |
824 | ||
f3ed775e | 825 | /* |
1c8d13c8 TD |
826 | * Enable event(s) for a channel. |
827 | * If no event name is specified, all events are enabled. | |
828 | * If no channel name is specified, the default 'channel0' is used. | |
829 | * Returns size of returned session payload data or a negative error code. | |
f3ed775e | 830 | */ |
cd80958d | 831 | int lttng_enable_event(struct lttng_handle *handle, |
38057ed1 | 832 | struct lttng_event *ev, const char *channel_name) |
1df4dedd | 833 | { |
cd80958d DG |
834 | struct lttcomm_session_msg lsm; |
835 | ||
5117eeec | 836 | if (handle == NULL || ev == NULL) { |
2f70b271 | 837 | return -LTTNG_ERR_INVALID; |
cd80958d | 838 | } |
33a2b854 | 839 | |
441c16a7 MD |
840 | memset(&lsm, 0, sizeof(lsm)); |
841 | ||
5117eeec | 842 | /* If no channel name, we put the default name */ |
94cf3c47 | 843 | if (channel_name == NULL) { |
cd80958d DG |
844 | copy_string(lsm.u.enable.channel_name, DEFAULT_CHANNEL_NAME, |
845 | sizeof(lsm.u.enable.channel_name)); | |
33a2b854 | 846 | } else { |
cd80958d DG |
847 | copy_string(lsm.u.enable.channel_name, channel_name, |
848 | sizeof(lsm.u.enable.channel_name)); | |
eb354453 DG |
849 | } |
850 | ||
cd80958d | 851 | copy_lttng_domain(&lsm.domain, &handle->domain); |
0d0c377a | 852 | |
8c9ae521 | 853 | if (ev->name[0] != '\0') { |
cd80958d | 854 | lsm.cmd_type = LTTNG_ENABLE_EVENT; |
0d0c377a | 855 | } else { |
cd80958d | 856 | lsm.cmd_type = LTTNG_ENABLE_ALL_EVENT; |
f3ed775e | 857 | } |
8c9ae521 | 858 | memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event)); |
f3ed775e | 859 | |
cd80958d DG |
860 | copy_string(lsm.session.name, handle->session_name, |
861 | sizeof(lsm.session.name)); | |
862 | ||
863 | return ask_sessiond(&lsm, NULL); | |
1df4dedd DG |
864 | } |
865 | ||
53a80697 | 866 | /* |
025faf73 | 867 | * Create or enable an event with a filter expression. |
178191b3 | 868 | * |
53a80697 MD |
869 | * Return negative error value on error. |
870 | * Return size of returned session payload data if OK. | |
871 | */ | |
025faf73 | 872 | int lttng_enable_event_with_filter(struct lttng_handle *handle, |
178191b3 | 873 | struct lttng_event *event, const char *channel_name, |
53a80697 MD |
874 | const char *filter_expression) |
875 | { | |
876 | struct lttcomm_session_msg lsm; | |
877 | struct filter_parser_ctx *ctx; | |
878 | FILE *fmem; | |
879 | int ret = 0; | |
880 | ||
52df2401 MD |
881 | if (!filter_expression) { |
882 | /* | |
883 | * Fall back to normal event enabling if no filter | |
884 | * specified. | |
885 | */ | |
886 | return lttng_enable_event(handle, event, channel_name); | |
887 | } | |
888 | ||
889 | /* | |
890 | * Empty filter string will always be rejected by the parser | |
891 | * anyway, so treat this corner-case early to eliminate | |
892 | * lttng_fmemopen error for 0-byte allocation. | |
893 | */ | |
894 | if (handle == NULL || filter_expression[0] == '\0') { | |
2f70b271 | 895 | return -LTTNG_ERR_INVALID; |
53a80697 MD |
896 | } |
897 | ||
53a80697 MD |
898 | /* |
899 | * casting const to non-const, as the underlying function will | |
900 | * use it in read-only mode. | |
901 | */ | |
902 | fmem = lttng_fmemopen((void *) filter_expression, | |
903 | strlen(filter_expression), "r"); | |
904 | if (!fmem) { | |
905 | fprintf(stderr, "Error opening memory as stream\n"); | |
ff7ef7b8 | 906 | return -LTTNG_ERR_FILTER_NOMEM; |
53a80697 MD |
907 | } |
908 | ctx = filter_parser_ctx_alloc(fmem); | |
909 | if (!ctx) { | |
910 | fprintf(stderr, "Error allocating parser\n"); | |
ff7ef7b8 | 911 | ret = -LTTNG_ERR_FILTER_NOMEM; |
53a80697 MD |
912 | goto alloc_error; |
913 | } | |
914 | ret = filter_parser_ctx_append_ast(ctx); | |
915 | if (ret) { | |
916 | fprintf(stderr, "Parse error\n"); | |
ff7ef7b8 | 917 | ret = -LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
918 | goto parse_error; |
919 | } | |
920 | ret = filter_visitor_set_parent(ctx); | |
921 | if (ret) { | |
922 | fprintf(stderr, "Set parent error\n"); | |
ff7ef7b8 | 923 | ret = -LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
924 | goto parse_error; |
925 | } | |
926 | if (print_xml) { | |
927 | ret = filter_visitor_print_xml(ctx, stdout, 0); | |
928 | if (ret) { | |
929 | fflush(stdout); | |
930 | fprintf(stderr, "XML print error\n"); | |
ff7ef7b8 | 931 | ret = -LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
932 | goto parse_error; |
933 | } | |
934 | } | |
935 | ||
936 | dbg_printf("Generating IR... "); | |
937 | fflush(stdout); | |
938 | ret = filter_visitor_ir_generate(ctx); | |
939 | if (ret) { | |
940 | fprintf(stderr, "Generate IR error\n"); | |
ff7ef7b8 | 941 | ret = -LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
942 | goto parse_error; |
943 | } | |
944 | dbg_printf("done\n"); | |
945 | ||
946 | dbg_printf("Validating IR... "); | |
947 | fflush(stdout); | |
948 | ret = filter_visitor_ir_check_binary_op_nesting(ctx); | |
949 | if (ret) { | |
ff7ef7b8 | 950 | ret = -LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
951 | goto parse_error; |
952 | } | |
953 | dbg_printf("done\n"); | |
954 | ||
955 | dbg_printf("Generating bytecode... "); | |
956 | fflush(stdout); | |
957 | ret = filter_visitor_bytecode_generate(ctx); | |
958 | if (ret) { | |
959 | fprintf(stderr, "Generate bytecode error\n"); | |
ff7ef7b8 | 960 | ret = -LTTNG_ERR_FILTER_INVAL; |
53a80697 MD |
961 | goto parse_error; |
962 | } | |
963 | dbg_printf("done\n"); | |
964 | dbg_printf("Size of bytecode generated: %u bytes.\n", | |
965 | bytecode_get_len(&ctx->bytecode->b)); | |
966 | ||
967 | memset(&lsm, 0, sizeof(lsm)); | |
968 | ||
025faf73 | 969 | lsm.cmd_type = LTTNG_ENABLE_EVENT_WITH_FILTER; |
53a80697 MD |
970 | |
971 | /* Copy channel name */ | |
025faf73 DG |
972 | copy_string(lsm.u.enable.channel_name, channel_name, |
973 | sizeof(lsm.u.enable.channel_name)); | |
53a80697 | 974 | /* Copy event name */ |
178191b3 DG |
975 | if (event) { |
976 | memcpy(&lsm.u.enable.event, event, sizeof(lsm.u.enable.event)); | |
977 | } | |
978 | ||
025faf73 | 979 | lsm.u.enable.bytecode_len = sizeof(ctx->bytecode->b) |
53a80697 MD |
980 | + bytecode_get_len(&ctx->bytecode->b); |
981 | ||
982 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
983 | ||
984 | copy_string(lsm.session.name, handle->session_name, | |
985 | sizeof(lsm.session.name)); | |
986 | ||
987 | ret = ask_sessiond_varlen(&lsm, &ctx->bytecode->b, | |
025faf73 | 988 | lsm.u.enable.bytecode_len, NULL); |
53a80697 MD |
989 | |
990 | filter_bytecode_free(ctx); | |
991 | filter_ir_free(ctx); | |
992 | filter_parser_ctx_free(ctx); | |
993 | if (fclose(fmem) != 0) { | |
994 | perror("fclose"); | |
995 | } | |
996 | return ret; | |
997 | ||
998 | parse_error: | |
999 | filter_bytecode_free(ctx); | |
1000 | filter_ir_free(ctx); | |
1001 | filter_parser_ctx_free(ctx); | |
1002 | alloc_error: | |
1003 | if (fclose(fmem) != 0) { | |
1004 | perror("fclose"); | |
1005 | } | |
1006 | return ret; | |
1007 | } | |
1008 | ||
1df4dedd | 1009 | /* |
1c8d13c8 TD |
1010 | * Disable event(s) of a channel and domain. |
1011 | * If no event name is specified, all events are disabled. | |
1012 | * If no channel name is specified, the default 'channel0' is used. | |
1013 | * Returns size of returned session payload data or a negative error code. | |
1df4dedd | 1014 | */ |
cd80958d | 1015 | int lttng_disable_event(struct lttng_handle *handle, const char *name, |
38057ed1 | 1016 | const char *channel_name) |
1df4dedd | 1017 | { |
cd80958d | 1018 | struct lttcomm_session_msg lsm; |
1df4dedd | 1019 | |
9d697d3d | 1020 | if (handle == NULL) { |
2f70b271 | 1021 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1022 | } |
1023 | ||
441c16a7 MD |
1024 | memset(&lsm, 0, sizeof(lsm)); |
1025 | ||
cd80958d DG |
1026 | if (channel_name) { |
1027 | copy_string(lsm.u.disable.channel_name, channel_name, | |
1028 | sizeof(lsm.u.disable.channel_name)); | |
f3ed775e | 1029 | } else { |
cd80958d DG |
1030 | copy_string(lsm.u.disable.channel_name, DEFAULT_CHANNEL_NAME, |
1031 | sizeof(lsm.u.disable.channel_name)); | |
eb354453 DG |
1032 | } |
1033 | ||
cd80958d | 1034 | copy_lttng_domain(&lsm.domain, &handle->domain); |
f5177a38 | 1035 | |
f84efadf | 1036 | if (name != NULL) { |
cd80958d DG |
1037 | copy_string(lsm.u.disable.name, name, sizeof(lsm.u.disable.name)); |
1038 | lsm.cmd_type = LTTNG_DISABLE_EVENT; | |
f5177a38 | 1039 | } else { |
cd80958d | 1040 | lsm.cmd_type = LTTNG_DISABLE_ALL_EVENT; |
f3ed775e DG |
1041 | } |
1042 | ||
cd80958d DG |
1043 | copy_string(lsm.session.name, handle->session_name, |
1044 | sizeof(lsm.session.name)); | |
1045 | ||
1046 | return ask_sessiond(&lsm, NULL); | |
1df4dedd DG |
1047 | } |
1048 | ||
1049 | /* | |
1c8d13c8 TD |
1050 | * Enable channel per domain |
1051 | * Returns size of returned session payload data or a negative error code. | |
a5c5a2bd | 1052 | */ |
cd80958d | 1053 | int lttng_enable_channel(struct lttng_handle *handle, |
38057ed1 | 1054 | struct lttng_channel *chan) |
a5c5a2bd | 1055 | { |
cd80958d DG |
1056 | struct lttcomm_session_msg lsm; |
1057 | ||
5117eeec DG |
1058 | /* |
1059 | * NULL arguments are forbidden. No default values. | |
1060 | */ | |
1061 | if (handle == NULL || chan == NULL) { | |
2f70b271 | 1062 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1063 | } |
1064 | ||
441c16a7 MD |
1065 | memset(&lsm, 0, sizeof(lsm)); |
1066 | ||
5117eeec | 1067 | memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan)); |
7d29a247 | 1068 | |
cd80958d DG |
1069 | lsm.cmd_type = LTTNG_ENABLE_CHANNEL; |
1070 | ||
1071 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
7d29a247 | 1072 | |
cd80958d DG |
1073 | copy_string(lsm.session.name, handle->session_name, |
1074 | sizeof(lsm.session.name)); | |
1075 | ||
1076 | return ask_sessiond(&lsm, NULL); | |
8c0faa1d | 1077 | } |
1df4dedd | 1078 | |
2ef84c95 | 1079 | /* |
1c8d13c8 TD |
1080 | * All tracing will be stopped for registered events of the channel. |
1081 | * Returns size of returned session payload data or a negative error code. | |
2ef84c95 | 1082 | */ |
cd80958d | 1083 | int lttng_disable_channel(struct lttng_handle *handle, const char *name) |
2ef84c95 | 1084 | { |
cd80958d DG |
1085 | struct lttcomm_session_msg lsm; |
1086 | ||
9d697d3d DG |
1087 | /* Safety check. Both are mandatory */ |
1088 | if (handle == NULL || name == NULL) { | |
2f70b271 | 1089 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1090 | } |
1091 | ||
441c16a7 MD |
1092 | memset(&lsm, 0, sizeof(lsm)); |
1093 | ||
cd80958d | 1094 | lsm.cmd_type = LTTNG_DISABLE_CHANNEL; |
1df4dedd | 1095 | |
9d697d3d DG |
1096 | copy_string(lsm.u.disable.channel_name, name, |
1097 | sizeof(lsm.u.disable.channel_name)); | |
1098 | ||
cd80958d DG |
1099 | copy_lttng_domain(&lsm.domain, &handle->domain); |
1100 | ||
1101 | copy_string(lsm.session.name, handle->session_name, | |
1102 | sizeof(lsm.session.name)); | |
1103 | ||
1104 | return ask_sessiond(&lsm, NULL); | |
ca95a216 DG |
1105 | } |
1106 | ||
fac6795d | 1107 | /* |
1c8d13c8 TD |
1108 | * Lists all available tracepoints of domain. |
1109 | * Sets the contents of the events array. | |
1110 | * Returns the number of lttng_event entries in events; | |
1111 | * on error, returns a negative value. | |
fac6795d | 1112 | */ |
cd80958d | 1113 | int lttng_list_tracepoints(struct lttng_handle *handle, |
2a71efd5 | 1114 | struct lttng_event **events) |
fac6795d | 1115 | { |
052da939 | 1116 | int ret; |
cd80958d DG |
1117 | struct lttcomm_session_msg lsm; |
1118 | ||
9d697d3d | 1119 | if (handle == NULL) { |
2f70b271 | 1120 | return -LTTNG_ERR_INVALID; |
cd80958d | 1121 | } |
fac6795d | 1122 | |
cd80958d DG |
1123 | lsm.cmd_type = LTTNG_LIST_TRACEPOINTS; |
1124 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
2a71efd5 | 1125 | |
cd80958d | 1126 | ret = ask_sessiond(&lsm, (void **) events); |
052da939 DG |
1127 | if (ret < 0) { |
1128 | return ret; | |
eb354453 | 1129 | } |
fac6795d | 1130 | |
9f19cc17 | 1131 | return ret / sizeof(struct lttng_event); |
fac6795d DG |
1132 | } |
1133 | ||
f37d259d MD |
1134 | /* |
1135 | * Lists all available tracepoint fields of domain. | |
1136 | * Sets the contents of the event field array. | |
1137 | * Returns the number of lttng_event_field entries in events; | |
1138 | * on error, returns a negative value. | |
1139 | */ | |
1140 | int lttng_list_tracepoint_fields(struct lttng_handle *handle, | |
1141 | struct lttng_event_field **fields) | |
1142 | { | |
1143 | int ret; | |
1144 | struct lttcomm_session_msg lsm; | |
1145 | ||
1146 | if (handle == NULL) { | |
2f70b271 | 1147 | return -LTTNG_ERR_INVALID; |
f37d259d MD |
1148 | } |
1149 | ||
1150 | lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS; | |
1151 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
1152 | ||
1153 | ret = ask_sessiond(&lsm, (void **) fields); | |
1154 | if (ret < 0) { | |
1155 | return ret; | |
1156 | } | |
1157 | ||
1158 | return ret / sizeof(struct lttng_event_field); | |
1159 | } | |
1160 | ||
1657e9bb | 1161 | /* |
1c8d13c8 TD |
1162 | * Returns a human readable string describing |
1163 | * the error code (a negative value). | |
1657e9bb | 1164 | */ |
9a745bc7 | 1165 | const char *lttng_strerror(int code) |
1657e9bb | 1166 | { |
f73fabfd | 1167 | return error_get_str(code); |
1657e9bb DG |
1168 | } |
1169 | ||
aaf97519 | 1170 | /* |
a4b92340 DG |
1171 | * Create a brand new session using name and url for destination. |
1172 | * | |
f73fabfd | 1173 | * Returns LTTNG_OK on success or a negative error code. |
00e2e675 | 1174 | */ |
a4b92340 | 1175 | int lttng_create_session(const char *name, const char *url) |
00e2e675 | 1176 | { |
3dd05a85 | 1177 | int ret; |
a4b92340 | 1178 | ssize_t size; |
00e2e675 | 1179 | struct lttcomm_session_msg lsm; |
a4b92340 | 1180 | struct lttng_uri *uris = NULL; |
00e2e675 | 1181 | |
a4b92340 | 1182 | if (name == NULL) { |
2f70b271 | 1183 | return -LTTNG_ERR_INVALID; |
00e2e675 DG |
1184 | } |
1185 | ||
a4b92340 | 1186 | memset(&lsm, 0, sizeof(lsm)); |
00e2e675 | 1187 | |
a4b92340 | 1188 | lsm.cmd_type = LTTNG_CREATE_SESSION; |
00e2e675 | 1189 | copy_string(lsm.session.name, name, sizeof(lsm.session.name)); |
a4b92340 DG |
1190 | |
1191 | /* There should never be a data URL */ | |
1192 | size = parse_str_urls_to_uri(url, NULL, &uris); | |
1193 | if (size < 0) { | |
2f70b271 | 1194 | return -LTTNG_ERR_INVALID; |
00e2e675 DG |
1195 | } |
1196 | ||
a4b92340 DG |
1197 | lsm.u.uri.size = size; |
1198 | ||
3dd05a85 | 1199 | ret = ask_sessiond_varlen(&lsm, uris, sizeof(struct lttng_uri) * size, |
a4b92340 | 1200 | NULL); |
3dd05a85 DG |
1201 | |
1202 | free(uris); | |
1203 | return ret; | |
00e2e675 DG |
1204 | } |
1205 | ||
8028d920 | 1206 | /* |
8028d920 | 1207 | * Destroy session using name. |
1c8d13c8 | 1208 | * Returns size of returned session payload data or a negative error code. |
8028d920 | 1209 | */ |
843f5df9 | 1210 | int lttng_destroy_session(const char *session_name) |
8028d920 | 1211 | { |
cd80958d DG |
1212 | struct lttcomm_session_msg lsm; |
1213 | ||
843f5df9 | 1214 | if (session_name == NULL) { |
2f70b271 | 1215 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1216 | } |
1217 | ||
1218 | lsm.cmd_type = LTTNG_DESTROY_SESSION; | |
843f5df9 DG |
1219 | |
1220 | copy_string(lsm.session.name, session_name, sizeof(lsm.session.name)); | |
cd80958d DG |
1221 | |
1222 | return ask_sessiond(&lsm, NULL); | |
aaf97519 DG |
1223 | } |
1224 | ||
57167058 | 1225 | /* |
57167058 | 1226 | * Ask the session daemon for all available sessions. |
1c8d13c8 TD |
1227 | * Sets the contents of the sessions array. |
1228 | * Returns the number of lttng_session entries in sessions; | |
1229 | * on error, returns a negative value. | |
57167058 | 1230 | */ |
ca95a216 | 1231 | int lttng_list_sessions(struct lttng_session **sessions) |
57167058 | 1232 | { |
ca95a216 | 1233 | int ret; |
cd80958d | 1234 | struct lttcomm_session_msg lsm; |
57167058 | 1235 | |
cd80958d DG |
1236 | lsm.cmd_type = LTTNG_LIST_SESSIONS; |
1237 | ret = ask_sessiond(&lsm, (void**) sessions); | |
57167058 | 1238 | if (ret < 0) { |
ca95a216 | 1239 | return ret; |
57167058 DG |
1240 | } |
1241 | ||
ca95a216 | 1242 | return ret / sizeof(struct lttng_session); |
57167058 DG |
1243 | } |
1244 | ||
9f19cc17 | 1245 | /* |
1c8d13c8 TD |
1246 | * Ask the session daemon for all available domains of a session. |
1247 | * Sets the contents of the domains array. | |
1248 | * Returns the number of lttng_domain entries in domains; | |
1249 | * on error, returns a negative value. | |
9f19cc17 | 1250 | */ |
330be774 | 1251 | int lttng_list_domains(const char *session_name, |
cd80958d | 1252 | struct lttng_domain **domains) |
9f19cc17 DG |
1253 | { |
1254 | int ret; | |
cd80958d DG |
1255 | struct lttcomm_session_msg lsm; |
1256 | ||
330be774 | 1257 | if (session_name == NULL) { |
2f70b271 | 1258 | return -LTTNG_ERR_INVALID; |
cd80958d | 1259 | } |
9f19cc17 | 1260 | |
cd80958d DG |
1261 | lsm.cmd_type = LTTNG_LIST_DOMAINS; |
1262 | ||
330be774 | 1263 | copy_string(lsm.session.name, session_name, sizeof(lsm.session.name)); |
cd80958d DG |
1264 | |
1265 | ret = ask_sessiond(&lsm, (void**) domains); | |
9f19cc17 DG |
1266 | if (ret < 0) { |
1267 | return ret; | |
1268 | } | |
1269 | ||
1270 | return ret / sizeof(struct lttng_domain); | |
1271 | } | |
1272 | ||
1273 | /* | |
1c8d13c8 TD |
1274 | * Ask the session daemon for all available channels of a session. |
1275 | * Sets the contents of the channels array. | |
1276 | * Returns the number of lttng_channel entries in channels; | |
1277 | * on error, returns a negative value. | |
9f19cc17 | 1278 | */ |
cd80958d DG |
1279 | int lttng_list_channels(struct lttng_handle *handle, |
1280 | struct lttng_channel **channels) | |
9f19cc17 DG |
1281 | { |
1282 | int ret; | |
cd80958d DG |
1283 | struct lttcomm_session_msg lsm; |
1284 | ||
9d697d3d | 1285 | if (handle == NULL) { |
2f70b271 | 1286 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1287 | } |
1288 | ||
1289 | lsm.cmd_type = LTTNG_LIST_CHANNELS; | |
1290 | copy_string(lsm.session.name, handle->session_name, | |
1291 | sizeof(lsm.session.name)); | |
9f19cc17 | 1292 | |
cd80958d | 1293 | copy_lttng_domain(&lsm.domain, &handle->domain); |
9f19cc17 | 1294 | |
cd80958d | 1295 | ret = ask_sessiond(&lsm, (void**) channels); |
9f19cc17 DG |
1296 | if (ret < 0) { |
1297 | return ret; | |
1298 | } | |
1299 | ||
1300 | return ret / sizeof(struct lttng_channel); | |
1301 | } | |
1302 | ||
1303 | /* | |
1c8d13c8 TD |
1304 | * Ask the session daemon for all available events of a session channel. |
1305 | * Sets the contents of the events array. | |
1306 | * Returns the number of lttng_event entries in events; | |
1307 | * on error, returns a negative value. | |
9f19cc17 | 1308 | */ |
cd80958d DG |
1309 | int lttng_list_events(struct lttng_handle *handle, |
1310 | const char *channel_name, struct lttng_event **events) | |
9f19cc17 DG |
1311 | { |
1312 | int ret; | |
cd80958d | 1313 | struct lttcomm_session_msg lsm; |
9f19cc17 | 1314 | |
9d697d3d DG |
1315 | /* Safety check. An handle and channel name are mandatory */ |
1316 | if (handle == NULL || channel_name == NULL) { | |
2f70b271 | 1317 | return -LTTNG_ERR_INVALID; |
cd80958d DG |
1318 | } |
1319 | ||
1320 | lsm.cmd_type = LTTNG_LIST_EVENTS; | |
1321 | copy_string(lsm.session.name, handle->session_name, | |
1322 | sizeof(lsm.session.name)); | |
1323 | copy_string(lsm.u.list.channel_name, channel_name, | |
1324 | sizeof(lsm.u.list.channel_name)); | |
1325 | ||
1326 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
9f19cc17 | 1327 | |
cd80958d | 1328 | ret = ask_sessiond(&lsm, (void**) events); |
9f19cc17 DG |
1329 | if (ret < 0) { |
1330 | return ret; | |
1331 | } | |
1332 | ||
1333 | return ret / sizeof(struct lttng_event); | |
1334 | } | |
1335 | ||
fac6795d | 1336 | /* |
1c8d13c8 TD |
1337 | * Sets the tracing_group variable with name. |
1338 | * This function allocates memory pointed to by tracing_group. | |
1339 | * On success, returns 0, on error, returns -1 (null name) or -ENOMEM. | |
fac6795d DG |
1340 | */ |
1341 | int lttng_set_tracing_group(const char *name) | |
1342 | { | |
9d697d3d | 1343 | if (name == NULL) { |
2f70b271 | 1344 | return -LTTNG_ERR_INVALID; |
9d697d3d DG |
1345 | } |
1346 | ||
fac6795d | 1347 | if (asprintf(&tracing_group, "%s", name) < 0) { |
2f70b271 | 1348 | return -LTTNG_ERR_FATAL; |
fac6795d DG |
1349 | } |
1350 | ||
1351 | return 0; | |
1352 | } | |
1353 | ||
d0254c7c | 1354 | /* |
af87c45a | 1355 | * Returns size of returned session payload data or a negative error code. |
d0254c7c | 1356 | */ |
cd80958d | 1357 | int lttng_calibrate(struct lttng_handle *handle, |
d0254c7c MD |
1358 | struct lttng_calibrate *calibrate) |
1359 | { | |
cd80958d | 1360 | struct lttcomm_session_msg lsm; |
d0254c7c | 1361 | |
9d697d3d DG |
1362 | /* Safety check. NULL pointer are forbidden */ |
1363 | if (handle == NULL || calibrate == NULL) { | |
2f70b271 | 1364 | return -LTTNG_ERR_INVALID; |
cd80958d | 1365 | } |
d0254c7c | 1366 | |
cd80958d DG |
1367 | lsm.cmd_type = LTTNG_CALIBRATE; |
1368 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
d0254c7c | 1369 | |
cd80958d DG |
1370 | memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate)); |
1371 | ||
1372 | return ask_sessiond(&lsm, NULL); | |
d0254c7c MD |
1373 | } |
1374 | ||
5edd7e09 DG |
1375 | /* |
1376 | * Set default channel attributes. | |
441c16a7 | 1377 | * If either or both of the arguments are null, attr content is zeroe'd. |
5edd7e09 DG |
1378 | */ |
1379 | void lttng_channel_set_default_attr(struct lttng_domain *domain, | |
1380 | struct lttng_channel_attr *attr) | |
1381 | { | |
1382 | /* Safety check */ | |
1383 | if (attr == NULL || domain == NULL) { | |
1384 | return; | |
1385 | } | |
1386 | ||
eacaa7a6 DS |
1387 | memset(attr, 0, sizeof(struct lttng_channel_attr)); |
1388 | ||
0a9c6494 DG |
1389 | /* Same for all domains. */ |
1390 | attr->overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
1391 | attr->tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE; | |
1392 | attr->tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT; | |
1393 | ||
5edd7e09 DG |
1394 | switch (domain->type) { |
1395 | case LTTNG_DOMAIN_KERNEL: | |
d92ff3ef DG |
1396 | attr->switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER; |
1397 | attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER; | |
3e230f92 | 1398 | attr->subbuf_size = default_get_kernel_channel_subbuf_size(); |
5edd7e09 DG |
1399 | attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; |
1400 | attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
1401 | break; | |
1402 | case LTTNG_DOMAIN_UST: | |
0a9c6494 DG |
1403 | switch (domain->buf_type) { |
1404 | case LTTNG_BUFFER_PER_UID: | |
1405 | attr->subbuf_size = default_get_ust_uid_channel_subbuf_size(); | |
1406 | attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM; | |
1407 | attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT; | |
1408 | attr->switch_timer_interval = DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER; | |
1409 | attr->read_timer_interval = DEFAULT_UST_UID_CHANNEL_READ_TIMER; | |
1410 | break; | |
1411 | case LTTNG_BUFFER_PER_PID: | |
1412 | default: | |
1413 | attr->subbuf_size = default_get_ust_pid_channel_subbuf_size(); | |
1414 | attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM; | |
1415 | attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT; | |
1416 | attr->switch_timer_interval = DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER; | |
1417 | attr->read_timer_interval = DEFAULT_UST_PID_CHANNEL_READ_TIMER; | |
1418 | break; | |
1419 | } | |
5edd7e09 | 1420 | default: |
441c16a7 | 1421 | /* Default behavior: leave set to 0. */ |
5edd7e09 DG |
1422 | break; |
1423 | } | |
1424 | } | |
1425 | ||
fac6795d | 1426 | /* |
2269e89e | 1427 | * Check if session daemon is alive. |
fac6795d | 1428 | * |
2269e89e | 1429 | * Return 1 if alive or 0 if not. |
1c8d13c8 | 1430 | * On error returns a negative value. |
fac6795d | 1431 | */ |
947308c4 | 1432 | int lttng_session_daemon_alive(void) |
fac6795d DG |
1433 | { |
1434 | int ret; | |
1435 | ||
1436 | ret = set_session_daemon_path(); | |
1437 | if (ret < 0) { | |
947308c4 | 1438 | /* Error */ |
fac6795d DG |
1439 | return ret; |
1440 | } | |
1441 | ||
9d035200 | 1442 | if (*sessiond_sock_path == '\0') { |
2f70b271 DG |
1443 | /* |
1444 | * No socket path set. Weird error which means the constructor was not | |
1445 | * called. | |
1446 | */ | |
1447 | assert(0); | |
fac6795d DG |
1448 | } |
1449 | ||
2269e89e | 1450 | ret = try_connect_sessiond(sessiond_sock_path); |
7d8234d9 MD |
1451 | if (ret < 0) { |
1452 | /* Not alive */ | |
1453 | return 0; | |
1454 | } | |
7d8234d9 | 1455 | |
947308c4 DG |
1456 | /* Is alive */ |
1457 | return 1; | |
fac6795d DG |
1458 | } |
1459 | ||
00e2e675 | 1460 | /* |
a4b92340 | 1461 | * Set URL for a consumer for a session and domain. |
00e2e675 DG |
1462 | * |
1463 | * Return 0 on success, else a negative value. | |
1464 | */ | |
a4b92340 DG |
1465 | int lttng_set_consumer_url(struct lttng_handle *handle, |
1466 | const char *control_url, const char *data_url) | |
00e2e675 | 1467 | { |
3dd05a85 | 1468 | int ret; |
a4b92340 | 1469 | ssize_t size; |
00e2e675 | 1470 | struct lttcomm_session_msg lsm; |
a4b92340 | 1471 | struct lttng_uri *uris = NULL; |
00e2e675 | 1472 | |
a4b92340 | 1473 | if (handle == NULL || (control_url == NULL && data_url == NULL)) { |
2f70b271 | 1474 | return -LTTNG_ERR_INVALID; |
00e2e675 DG |
1475 | } |
1476 | ||
a4b92340 DG |
1477 | memset(&lsm, 0, sizeof(lsm)); |
1478 | ||
00e2e675 DG |
1479 | lsm.cmd_type = LTTNG_SET_CONSUMER_URI; |
1480 | ||
1481 | copy_string(lsm.session.name, handle->session_name, | |
1482 | sizeof(lsm.session.name)); | |
1483 | copy_lttng_domain(&lsm.domain, &handle->domain); | |
1484 | ||
a4b92340 DG |
1485 | size = parse_str_urls_to_uri(control_url, data_url, &uris); |
1486 | if (size < 0) { | |
2f70b271 | 1487 | return -LTTNG_ERR_INVALID; |
a4b92340 DG |
1488 | } |
1489 | ||
1490 | lsm.u.uri.size = size; | |
00e2e675 | 1491 | |
3dd05a85 | 1492 | ret = ask_sessiond_varlen(&lsm, uris, sizeof(struct lttng_uri) * size, |
a4b92340 | 1493 | NULL); |
3dd05a85 DG |
1494 | |
1495 | free(uris); | |
1496 | return ret; | |
00e2e675 DG |
1497 | } |
1498 | ||
1499 | /* | |
9c6bda17 | 1500 | * [OBSOLETE] |
00e2e675 DG |
1501 | */ |
1502 | int lttng_enable_consumer(struct lttng_handle *handle) | |
1503 | { | |
785d2d0d | 1504 | return -ENOSYS; |
00e2e675 DG |
1505 | } |
1506 | ||
1507 | /* | |
9c6bda17 | 1508 | * [OBSOLETE] |
00e2e675 DG |
1509 | */ |
1510 | int lttng_disable_consumer(struct lttng_handle *handle) | |
1511 | { | |
785d2d0d | 1512 | return -ENOSYS; |
00e2e675 DG |
1513 | } |
1514 | ||
44a5e5eb DG |
1515 | /* |
1516 | * Set health socket path by putting it in the global health_sock_path | |
1517 | * variable. | |
1518 | * | |
1519 | * Returns 0 on success or assert(0) on ENOMEM. | |
1520 | */ | |
1521 | static int set_health_socket_path(void) | |
1522 | { | |
44a5e5eb DG |
1523 | int in_tgroup = 0; /* In tracing group */ |
1524 | uid_t uid; | |
1525 | const char *home; | |
1526 | ||
1527 | uid = getuid(); | |
1528 | ||
1529 | if (uid != 0) { | |
1530 | /* Are we in the tracing group ? */ | |
1531 | in_tgroup = check_tracing_group(tracing_group); | |
1532 | } | |
1533 | ||
1534 | if ((uid == 0) || in_tgroup) { | |
1535 | copy_string(health_sock_path, DEFAULT_GLOBAL_HEALTH_UNIX_SOCK, | |
1536 | sizeof(health_sock_path)); | |
1537 | } | |
1538 | ||
1539 | if (uid != 0) { | |
c617c0c6 MD |
1540 | int ret; |
1541 | ||
44a5e5eb DG |
1542 | /* |
1543 | * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small; | |
1544 | * With GNU C >= 2.1, snprintf returns the required size (excluding closing null) | |
1545 | */ | |
1546 | home = getenv("HOME"); | |
1547 | if (home == NULL) { | |
1548 | /* Fallback in /tmp .. */ | |
1549 | home = "/tmp"; | |
1550 | } | |
1551 | ||
1552 | ret = snprintf(health_sock_path, sizeof(health_sock_path), | |
1553 | DEFAULT_HOME_HEALTH_UNIX_SOCK, home); | |
1554 | if ((ret < 0) || (ret >= sizeof(health_sock_path))) { | |
1555 | /* ENOMEM at this point... just kill the control lib. */ | |
1556 | assert(0); | |
1557 | } | |
1558 | } | |
1559 | ||
1560 | return 0; | |
1561 | } | |
1562 | ||
1563 | /* | |
1564 | * Check session daemon health for a specific health component. | |
1565 | * | |
2f70b271 | 1566 | * Return 0 if health is OK or else 1 if BAD. |
44a5e5eb | 1567 | * |
2f70b271 | 1568 | * Any other negative value is a lttng error code which can be translated with |
44a5e5eb DG |
1569 | * lttng_strerror(). |
1570 | */ | |
1571 | int lttng_health_check(enum lttng_health_component c) | |
1572 | { | |
1573 | int sock, ret; | |
1574 | struct lttcomm_health_msg msg; | |
1575 | struct lttcomm_health_data reply; | |
1576 | ||
1577 | /* Connect to the sesssion daemon */ | |
1578 | sock = lttcomm_connect_unix_sock(health_sock_path); | |
1579 | if (sock < 0) { | |
2f70b271 | 1580 | ret = -LTTNG_ERR_NO_SESSIOND; |
44a5e5eb DG |
1581 | goto error; |
1582 | } | |
1583 | ||
1584 | msg.cmd = LTTNG_HEALTH_CHECK; | |
1585 | msg.component = c; | |
1586 | ||
1587 | ret = lttcomm_send_unix_sock(sock, (void *)&msg, sizeof(msg)); | |
1588 | if (ret < 0) { | |
2f70b271 | 1589 | ret = -LTTNG_ERR_FATAL; |
44a5e5eb DG |
1590 | goto close_error; |
1591 | } | |
1592 | ||
1593 | ret = lttcomm_recv_unix_sock(sock, (void *)&reply, sizeof(reply)); | |
1594 | if (ret < 0) { | |
2f70b271 | 1595 | ret = -LTTNG_ERR_FATAL; |
44a5e5eb DG |
1596 | goto close_error; |
1597 | } | |
1598 | ||
1599 | ret = reply.ret_code; | |
1600 | ||
1601 | close_error: | |
67ef15b7 MD |
1602 | { |
1603 | int closeret; | |
1604 | ||
1605 | closeret = close(sock); | |
1606 | assert(!closeret); | |
1607 | } | |
44a5e5eb DG |
1608 | |
1609 | error: | |
1610 | return ret; | |
1611 | } | |
1612 | ||
07424f16 DG |
1613 | /* |
1614 | * This is an extension of create session that is ONLY and SHOULD only be used | |
1615 | * by the lttng command line program. It exists to avoid using URI parsing in | |
1616 | * the lttng client. | |
1617 | * | |
1618 | * We need the date and time for the trace path subdirectory for the case where | |
1619 | * the user does NOT define one using either -o or -U. Using the normal | |
1620 | * lttng_create_session API call, we have no clue on the session daemon side if | |
1621 | * the URL was generated automatically by the client or define by the user. | |
1622 | * | |
1623 | * So this function "wrapper" is hidden from the public API, takes the datetime | |
1624 | * string and appends it if necessary to the URI subdirectory before sending it | |
1625 | * to the session daemon. | |
1626 | * | |
1627 | * With this extra function, the lttng_create_session call behavior is not | |
1628 | * changed and the timestamp is appended to the URI on the session daemon side | |
1629 | * if necessary. | |
1630 | */ | |
1631 | int _lttng_create_session_ext(const char *name, const char *url, | |
1632 | const char *datetime) | |
1633 | { | |
3dd05a85 | 1634 | int ret; |
07424f16 DG |
1635 | ssize_t size; |
1636 | struct lttcomm_session_msg lsm; | |
1637 | struct lttng_uri *uris = NULL; | |
1638 | ||
d0b96690 | 1639 | if (name == NULL || datetime == NULL || url == NULL) { |
2f70b271 | 1640 | return -LTTNG_ERR_INVALID; |
07424f16 DG |
1641 | } |
1642 | ||
1643 | memset(&lsm, 0, sizeof(lsm)); | |
1644 | ||
1645 | lsm.cmd_type = LTTNG_CREATE_SESSION; | |
04965770 | 1646 | copy_string(lsm.session.name, name, sizeof(lsm.session.name)); |
07424f16 DG |
1647 | |
1648 | /* There should never be a data URL */ | |
1649 | size = parse_str_urls_to_uri(url, NULL, &uris); | |
1650 | if (size < 0) { | |
3dd05a85 DG |
1651 | ret = -LTTNG_ERR_INVALID; |
1652 | goto error; | |
07424f16 DG |
1653 | } |
1654 | ||
1655 | lsm.u.uri.size = size; | |
1656 | ||
4b35a6b3 | 1657 | if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) { |
da4aa2b8 DG |
1658 | /* Don't append datetime if the name was automatically created. */ |
1659 | if (strncmp(name, DEFAULT_SESSION_NAME "-", | |
1660 | strlen(DEFAULT_SESSION_NAME) + 1)) { | |
1661 | ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s-%s", | |
1662 | name, datetime); | |
1663 | } else { | |
1664 | ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s", name); | |
1665 | } | |
07424f16 DG |
1666 | if (ret < 0) { |
1667 | PERROR("snprintf uri subdir"); | |
3dd05a85 DG |
1668 | ret = -LTTNG_ERR_FATAL; |
1669 | goto error; | |
07424f16 DG |
1670 | } |
1671 | } | |
1672 | ||
3dd05a85 | 1673 | ret = ask_sessiond_varlen(&lsm, uris, sizeof(struct lttng_uri) * size, |
07424f16 | 1674 | NULL); |
3dd05a85 DG |
1675 | |
1676 | error: | |
1677 | free(uris); | |
1678 | return ret; | |
07424f16 DG |
1679 | } |
1680 | ||
806e2684 DG |
1681 | /* |
1682 | * For a given session name, this call checks if the data is ready to be read | |
1683 | * or is still being extracted by the consumer(s) hence not ready to be used by | |
1684 | * any readers. | |
1685 | */ | |
6d805429 | 1686 | int lttng_data_pending(const char *session_name) |
806e2684 DG |
1687 | { |
1688 | int ret; | |
1689 | struct lttcomm_session_msg lsm; | |
1690 | ||
1691 | if (session_name == NULL) { | |
1692 | return -LTTNG_ERR_INVALID; | |
1693 | } | |
1694 | ||
6d805429 | 1695 | lsm.cmd_type = LTTNG_DATA_PENDING; |
806e2684 DG |
1696 | |
1697 | copy_string(lsm.session.name, session_name, sizeof(lsm.session.name)); | |
1698 | ||
1699 | ret = ask_sessiond(&lsm, NULL); | |
1700 | ||
1701 | /* | |
1702 | * The ask_sessiond function negate the return code if it's not LTTNG_OK so | |
1703 | * getting -1 means that the reply ret_code was 1 thus meaning that the | |
1704 | * data is available. Yes it is hackish but for now this is the only way. | |
1705 | */ | |
1706 | if (ret == -1) { | |
1707 | ret = 1; | |
1708 | } | |
1709 | ||
1710 | return ret; | |
1711 | } | |
1712 | ||
fac6795d DG |
1713 | /* |
1714 | * lib constructor | |
1715 | */ | |
1716 | static void __attribute__((constructor)) init() | |
1717 | { | |
1718 | /* Set default session group */ | |
bbccc3d2 | 1719 | lttng_set_tracing_group(DEFAULT_TRACING_GROUP); |
44a5e5eb DG |
1720 | /* Set socket for health check */ |
1721 | (void) set_health_socket_path(); | |
fac6795d | 1722 | } |
49cca668 DG |
1723 | |
1724 | /* | |
1725 | * lib destructor | |
1726 | */ | |
1727 | static void __attribute__((destructor)) lttng_ctl_exit() | |
1728 | { | |
1729 | free(tracing_group); | |
1730 | } |