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ccf10263 MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * Copyright (C) 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along | |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
17 | */ | |
18 | ||
ccf10263 MD |
19 | #define _LGPL_SOURCE |
20 | #include <ctype.h> | |
21 | #include <popt.h> | |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
24 | #include <string.h> | |
25 | #include <sys/stat.h> | |
26 | #include <sys/types.h> | |
27 | #include <unistd.h> | |
3ecec76a | 28 | #include <assert.h> |
ccf10263 MD |
29 | |
30 | #include <urcu/list.h> | |
31 | ||
32 | #include <common/mi-lttng.h> | |
33 | ||
34 | #include "../command.h" | |
35 | ||
36 | enum cmd_type { | |
37 | CMD_TRACK, | |
38 | CMD_UNTRACK, | |
39 | }; | |
40 | ||
41 | static char *opt_session_name; | |
42 | static int opt_kernel; | |
43 | static int opt_userspace; | |
44 | static int opt_all; | |
45 | static char *opt_pid_string; | |
46 | static int opt_pid; | |
47 | ||
48 | enum { | |
49 | OPT_HELP = 1, | |
50 | OPT_LIST_OPTIONS, | |
51 | OPT_SESSION, | |
52 | OPT_PID, | |
53 | }; | |
54 | ||
55 | static struct poptOption long_options[] = { | |
56 | /* { longName, shortName, argInfo, argPtr, value, descrip, argDesc, } */ | |
57 | { "help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0, }, | |
58 | { "session", 's', POPT_ARG_STRING, &opt_session_name, OPT_SESSION, 0, 0, }, | |
59 | { "kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0, }, | |
60 | { "userspace", 'u', POPT_ARG_VAL, &opt_userspace, 1, 0, 0, }, | |
61 | { "pid", 'p', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, &opt_pid_string, OPT_PID, 0, 0, }, | |
62 | { "all", 'a', POPT_ARG_VAL, &opt_all, 1, 0, 0, }, | |
63 | { "list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, 0, 0, }, | |
64 | { 0, 0, 0, 0, 0, 0, 0, }, | |
65 | }; | |
66 | ||
ccf10263 MD |
67 | static |
68 | int parse_pid_string(const char *_pid_string, | |
69 | int all, int **_pid_list, int *nr_pids) | |
70 | { | |
71 | const char *one_pid_str; | |
72 | char *iter; | |
73 | int retval = CMD_SUCCESS; | |
74 | int count = 0; | |
75 | int *pid_list = NULL; | |
76 | char *pid_string = NULL; | |
44c1a903 | 77 | char *endptr; |
ccf10263 MD |
78 | |
79 | if (all && _pid_string) { | |
80 | ERR("An empty PID string is expected with --all"); | |
81 | retval = CMD_ERROR; | |
82 | goto error; | |
83 | } | |
84 | if (!all && !_pid_string) { | |
85 | ERR("Please specify --all with an empty PID string"); | |
86 | retval = CMD_ERROR; | |
87 | goto error; | |
88 | } | |
89 | if (all) { | |
03ea8167 | 90 | pid_list = zmalloc(sizeof(*pid_list)); |
ccf10263 MD |
91 | if (!pid_list) { |
92 | ERR("Out of memory"); | |
93 | retval = CMD_ERROR; | |
94 | goto error; | |
95 | } | |
96 | /* Empty PID string means all PIDs */ | |
97 | count = 1; | |
98 | pid_list[0] = -1; | |
99 | goto assign; | |
100 | } | |
101 | ||
102 | pid_string = strdup(_pid_string); | |
103 | if (!pid_string) { | |
104 | ERR("Out of memory"); | |
105 | retval = CMD_ERROR; | |
106 | goto error; | |
107 | } | |
108 | ||
109 | /* Count */ | |
110 | one_pid_str = strtok_r(pid_string, ",", &iter); | |
111 | while (one_pid_str != NULL) { | |
112 | unsigned long v; | |
113 | ||
44c1a903 JR |
114 | errno = 0; |
115 | v = strtoul(one_pid_str, &endptr, 10); | |
ccf10263 | 116 | if ((v == 0 && errno == EINVAL) |
44c1a903 JR |
117 | || (v == ULONG_MAX && errno == ERANGE) |
118 | || (*one_pid_str != '\0' && *endptr != '\0')){ | |
ccf10263 MD |
119 | ERR("Error parsing PID %s", one_pid_str); |
120 | retval = CMD_ERROR; | |
121 | goto error; | |
122 | } | |
44c1a903 | 123 | |
ccf10263 MD |
124 | if ((long) v > INT_MAX || (int) v < 0) { |
125 | ERR("Invalid PID value %ld", (long) v); | |
126 | retval = CMD_ERROR; | |
127 | goto error; | |
128 | } | |
129 | count++; | |
130 | ||
131 | /* For next loop */ | |
132 | one_pid_str = strtok_r(NULL, ",", &iter); | |
133 | } | |
f3c5f4ac JG |
134 | if (count == 0) { |
135 | ERR("Fatal error occurred when parsing pid string"); | |
136 | retval = CMD_ERROR; | |
137 | goto error; | |
138 | } | |
ccf10263 MD |
139 | |
140 | free(pid_string); | |
141 | /* Identity of delimiter has been lost in first pass. */ | |
142 | pid_string = strdup(_pid_string); | |
143 | if (!pid_string) { | |
144 | ERR("Out of memory"); | |
145 | retval = CMD_ERROR; | |
146 | goto error; | |
147 | } | |
148 | ||
149 | /* Allocate */ | |
150 | pid_list = zmalloc(count * sizeof(*pid_list)); | |
151 | if (!pid_list) { | |
152 | ERR("Out of memory"); | |
153 | retval = CMD_ERROR; | |
154 | goto error; | |
155 | } | |
156 | ||
5cfbc08c | 157 | /* Reparse string and populate the pid list. */ |
ccf10263 MD |
158 | count = 0; |
159 | one_pid_str = strtok_r(pid_string, ",", &iter); | |
160 | while (one_pid_str != NULL) { | |
161 | unsigned long v; | |
162 | ||
163 | v = strtoul(one_pid_str, NULL, 10); | |
164 | pid_list[count++] = (int) v; | |
165 | ||
166 | /* For next loop */ | |
167 | one_pid_str = strtok_r(NULL, ",", &iter); | |
168 | } | |
169 | ||
170 | assign: | |
171 | *nr_pids = count; | |
172 | *_pid_list = pid_list; | |
173 | goto end; /* SUCCESS */ | |
174 | ||
175 | /* ERROR */ | |
176 | error: | |
177 | free(pid_list); | |
178 | end: | |
179 | free(pid_string); | |
180 | return retval; | |
181 | } | |
182 | ||
183 | static | |
c51da673 | 184 | enum cmd_error_code track_untrack_pid(enum cmd_type cmd_type, const char *cmd_str, |
ccf10263 MD |
185 | const char *session_name, const char *pid_string, |
186 | int all, struct mi_writer *writer) | |
187 | { | |
c51da673 JG |
188 | int ret, success = 1 , i; |
189 | enum cmd_error_code retval = CMD_SUCCESS; | |
ccf10263 MD |
190 | int *pid_list = NULL; |
191 | int nr_pids; | |
192 | struct lttng_domain dom; | |
193 | struct lttng_handle *handle = NULL; | |
669d25b6 | 194 | int (*cmd_func)(struct lttng_handle *handle, int pid); |
ccf10263 MD |
195 | |
196 | switch (cmd_type) { | |
197 | case CMD_TRACK: | |
669d25b6 | 198 | cmd_func = lttng_track_pid; |
ccf10263 MD |
199 | break; |
200 | case CMD_UNTRACK: | |
669d25b6 | 201 | cmd_func = lttng_untrack_pid; |
ccf10263 MD |
202 | break; |
203 | default: | |
204 | ERR("Unknown command"); | |
205 | retval = CMD_ERROR; | |
206 | goto end; | |
207 | } | |
208 | ||
209 | memset(&dom, 0, sizeof(dom)); | |
210 | if (opt_kernel) { | |
211 | dom.type = LTTNG_DOMAIN_KERNEL; | |
212 | } else if (opt_userspace) { | |
213 | dom.type = LTTNG_DOMAIN_UST; | |
214 | } else { | |
3ecec76a PP |
215 | /* Checked by the caller. */ |
216 | assert(0); | |
ccf10263 MD |
217 | } |
218 | ||
219 | ret = parse_pid_string(pid_string, all, &pid_list, &nr_pids); | |
220 | if (ret != CMD_SUCCESS) { | |
221 | ERR("Error parsing PID string"); | |
ccf10263 MD |
222 | retval = CMD_ERROR; |
223 | goto end; | |
224 | } | |
225 | ||
226 | handle = lttng_create_handle(session_name, &dom); | |
227 | if (handle == NULL) { | |
228 | retval = CMD_ERROR; | |
229 | goto end; | |
230 | } | |
231 | ||
232 | if (writer) { | |
ebbf5ab7 JR |
233 | /* Open process element */ |
234 | ret = mi_lttng_targets_open(writer); | |
ccf10263 MD |
235 | if (ret) { |
236 | retval = CMD_ERROR; | |
237 | goto end; | |
238 | } | |
239 | } | |
240 | ||
ccf10263 MD |
241 | for (i = 0; i < nr_pids; i++) { |
242 | DBG("%s PID %d", cmd_str, pid_list[i]); | |
669d25b6 | 243 | ret = cmd_func(handle, pid_list[i]); |
ccf10263 | 244 | if (ret) { |
b93a4a13 MJ |
245 | switch (-ret) { |
246 | case LTTNG_ERR_PID_TRACKED: | |
247 | WARN("PID %i already tracked in session %s", | |
248 | pid_list[i], session_name); | |
249 | success = 1; | |
250 | retval = CMD_SUCCESS; | |
251 | break; | |
252 | case LTTNG_ERR_PID_NOT_TRACKED: | |
253 | WARN("PID %i not tracked in session %s", | |
254 | pid_list[i], session_name); | |
255 | success = 1; | |
256 | retval = CMD_SUCCESS; | |
257 | break; | |
258 | default: | |
259 | ERR("%s", lttng_strerror(ret)); | |
260 | success = 0; | |
261 | retval = CMD_ERROR; | |
262 | break; | |
263 | } | |
ebbf5ab7 | 264 | } else { |
b93a4a13 MJ |
265 | MSG("PID %i %sed in session %s", |
266 | pid_list[i], cmd_str, session_name); | |
ebbf5ab7 JR |
267 | success = 1; |
268 | } | |
269 | ||
270 | /* Mi */ | |
271 | if (writer) { | |
272 | ret = mi_lttng_pid_target(writer, pid_list[i], 1); | |
273 | if (ret) { | |
274 | retval = CMD_ERROR; | |
275 | goto end; | |
276 | } | |
277 | ||
278 | ret = mi_lttng_writer_write_element_bool(writer, | |
279 | mi_lttng_element_success, success); | |
280 | if (ret) { | |
281 | retval = CMD_ERROR; | |
282 | goto end; | |
283 | } | |
284 | ||
285 | ret = mi_lttng_writer_close_element(writer); | |
286 | if (ret) { | |
287 | retval = CMD_ERROR; | |
288 | goto end; | |
289 | } | |
ccf10263 MD |
290 | } |
291 | } | |
292 | ||
293 | if (writer) { | |
ebbf5ab7 | 294 | /* Close targets element */ |
ccf10263 MD |
295 | ret = mi_lttng_writer_close_element(writer); |
296 | if (ret) { | |
297 | retval = CMD_ERROR; | |
298 | goto end; | |
299 | } | |
300 | } | |
301 | ||
ccf10263 MD |
302 | end: |
303 | if (handle) { | |
304 | lttng_destroy_handle(handle); | |
305 | } | |
306 | free(pid_list); | |
307 | return retval; | |
308 | } | |
309 | ||
310 | static | |
311 | const char *get_mi_element_command(enum cmd_type cmd_type) | |
312 | { | |
313 | switch (cmd_type) { | |
314 | case CMD_TRACK: | |
315 | return mi_lttng_element_command_track; | |
316 | case CMD_UNTRACK: | |
317 | return mi_lttng_element_command_untrack; | |
318 | default: | |
319 | return NULL; | |
320 | } | |
321 | } | |
322 | ||
323 | /* | |
324 | * Add/remove tracker to/from session. | |
325 | */ | |
326 | static | |
327 | int cmd_track_untrack(enum cmd_type cmd_type, const char *cmd_str, | |
328 | int argc, const char **argv) | |
329 | { | |
c51da673 JG |
330 | int opt, ret = 0; |
331 | enum cmd_error_code command_ret = CMD_SUCCESS; | |
ccf10263 MD |
332 | int success = 1; |
333 | static poptContext pc; | |
334 | char *session_name = NULL; | |
335 | struct mi_writer *writer = NULL; | |
336 | ||
337 | if (argc < 1) { | |
c51da673 | 338 | command_ret = CMD_ERROR; |
ccf10263 MD |
339 | goto end; |
340 | } | |
341 | ||
342 | pc = poptGetContext(NULL, argc, argv, long_options, 0); | |
343 | poptReadDefaultConfig(pc, 0); | |
344 | ||
345 | while ((opt = poptGetNextOpt(pc)) != -1) { | |
346 | switch (opt) { | |
347 | case OPT_HELP: | |
4ba92f18 | 348 | SHOW_HELP(); |
ccf10263 MD |
349 | goto end; |
350 | case OPT_LIST_OPTIONS: | |
351 | list_cmd_options(stdout, long_options); | |
352 | goto end; | |
353 | case OPT_SESSION: | |
354 | case OPT_PID: | |
355 | opt_pid = 1; | |
356 | break; | |
357 | default: | |
c51da673 | 358 | command_ret = CMD_UNDEFINED; |
ccf10263 MD |
359 | goto end; |
360 | } | |
361 | } | |
362 | ||
3ecec76a PP |
363 | ret = print_missing_or_multiple_domains(opt_kernel + opt_userspace); |
364 | if (ret) { | |
e45f5319 | 365 | command_ret = CMD_ERROR; |
ccf10263 MD |
366 | goto end; |
367 | } | |
368 | ||
369 | if (!opt_session_name) { | |
370 | session_name = get_session_name(); | |
371 | if (session_name == NULL) { | |
c51da673 | 372 | command_ret = CMD_ERROR; |
ccf10263 MD |
373 | goto end; |
374 | } | |
375 | } else { | |
376 | session_name = opt_session_name; | |
377 | } | |
378 | ||
379 | /* Currently only PID tracker is supported */ | |
380 | if (!opt_pid) { | |
381 | ERR("Please specify at least one tracker with its expected arguments"); | |
c51da673 | 382 | command_ret = CMD_ERROR; |
ccf10263 MD |
383 | goto end; |
384 | } | |
385 | ||
386 | /* Mi check */ | |
387 | if (lttng_opt_mi) { | |
388 | writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi); | |
389 | if (!writer) { | |
c51da673 | 390 | command_ret = CMD_ERROR; |
ccf10263 MD |
391 | goto end; |
392 | } | |
393 | } | |
394 | ||
395 | if (writer) { | |
396 | /* Open command element */ | |
397 | ret = mi_lttng_writer_command_open(writer, | |
398 | get_mi_element_command(cmd_type)); | |
399 | if (ret) { | |
c51da673 | 400 | command_ret = CMD_ERROR; |
ccf10263 MD |
401 | goto end; |
402 | } | |
403 | ||
404 | /* Open output element */ | |
405 | ret = mi_lttng_writer_open_element(writer, | |
406 | mi_lttng_element_command_output); | |
407 | if (ret) { | |
c51da673 | 408 | command_ret = CMD_ERROR; |
ccf10263 MD |
409 | goto end; |
410 | } | |
411 | } | |
412 | ||
413 | command_ret = track_untrack_pid(cmd_type, | |
414 | cmd_str, session_name, opt_pid_string, | |
415 | opt_all, writer); | |
c51da673 | 416 | if (command_ret != CMD_SUCCESS) { |
ccf10263 MD |
417 | success = 0; |
418 | } | |
419 | ||
420 | /* Mi closing */ | |
421 | if (writer) { | |
422 | /* Close output element */ | |
423 | ret = mi_lttng_writer_close_element(writer); | |
424 | if (ret) { | |
c51da673 | 425 | command_ret = CMD_ERROR; |
ccf10263 MD |
426 | goto end; |
427 | } | |
428 | ||
429 | /* Success ? */ | |
430 | ret = mi_lttng_writer_write_element_bool(writer, | |
431 | mi_lttng_element_command_success, success); | |
432 | if (ret) { | |
c51da673 | 433 | command_ret = CMD_ERROR; |
ccf10263 MD |
434 | goto end; |
435 | } | |
436 | ||
437 | /* Command element close */ | |
438 | ret = mi_lttng_writer_command_close(writer); | |
439 | if (ret) { | |
c51da673 | 440 | command_ret = CMD_ERROR; |
ccf10263 MD |
441 | goto end; |
442 | } | |
443 | } | |
444 | ||
445 | end: | |
446 | if (!opt_session_name) { | |
447 | free(session_name); | |
448 | } | |
449 | ||
450 | /* Mi clean-up */ | |
451 | if (writer && mi_lttng_writer_destroy(writer)) { | |
452 | /* Preserve original error code */ | |
c51da673 | 453 | command_ret = CMD_ERROR; |
ccf10263 MD |
454 | } |
455 | ||
ccf10263 | 456 | poptFreeContext(pc); |
c51da673 | 457 | return (int) command_ret; |
ccf10263 MD |
458 | } |
459 | ||
460 | int cmd_track(int argc, const char **argv) | |
461 | { | |
462 | return cmd_track_untrack(CMD_TRACK, "track", argc, argv); | |
463 | } | |
464 | ||
465 | int cmd_untrack(int argc, const char **argv) | |
466 | { | |
467 | return cmd_track_untrack(CMD_UNTRACK, "untrack", argc, argv); | |
468 | } |