a258f64097f275c0c116c4cae1232f5dba181544
[lttng-tools.git] / src / bin / lttng / commands / destroy.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18 #define _LGPL_SOURCE
19 #include <popt.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <sys/stat.h>
24 #include <sys/types.h>
25 #include <unistd.h>
26 #include <stdbool.h>
27 #include <lttng/lttng.h>
28
29 #include "../command.h"
30
31 #include <common/mi-lttng.h>
32 #include <common/sessiond-comm/sessiond-comm.h>
33 #include <common/utils.h>
34
35 static char *opt_session_name;
36 static int opt_destroy_all;
37 static int opt_no_wait;
38
39 #ifdef LTTNG_EMBED_HELP
40 static const char help_msg[] =
41 #include <lttng-destroy.1.h>
42 ;
43 #endif
44
45 /* Mi writer */
46 static struct mi_writer *writer;
47
48 enum {
49 OPT_HELP = 1,
50 OPT_LIST_OPTIONS,
51 };
52
53 static struct poptOption long_options[] = {
54 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
55 {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
56 {"all", 'a', POPT_ARG_VAL, &opt_destroy_all, 1, 0, 0},
57 {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
58 {"no-wait", 'n', POPT_ARG_VAL, &opt_no_wait, 1, 0, 0},
59 {0, 0, 0, 0, 0, 0, 0}
60 };
61
62 /*
63 * destroy_session
64 *
65 * Unregister the provided session to the session daemon. On success, removes
66 * the default configuration.
67 */
68 static int destroy_session(struct lttng_session *session)
69 {
70 int ret;
71 char *session_name = NULL;
72 bool session_was_stopped;
73 enum lttng_error_code ret_code;
74 struct lttng_destruction_handle *handle = NULL;
75 enum lttng_destruction_handle_status status;
76 bool printed_wait_msg = false;
77 enum lttng_rotation_state rotation_state;
78
79 ret = lttng_stop_tracing_no_wait(session->name);
80 if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
81 ERR("%s", lttng_strerror(ret));
82 }
83 session_was_stopped = ret == -LTTNG_ERR_TRACE_ALREADY_STOPPED;
84 if (!opt_no_wait) {
85 do {
86 ret = lttng_data_pending(session->name);
87 if (ret < 0) {
88 /* Return the data available call error. */
89 goto error;
90 }
91
92 /*
93 * Data sleep time before retrying (in usec). Don't sleep if the call
94 * returned value indicates availability.
95 */
96 if (ret) {
97 if (!printed_wait_msg) {
98 _MSG("Waiting for destruction of session \"%s\"",
99 session->name);
100 printed_wait_msg = true;
101 fflush(stdout);
102 }
103
104 usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME_US);
105 _MSG(".");
106 fflush(stdout);
107 }
108 } while (ret != 0);
109 }
110 if (!session_was_stopped) {
111 /*
112 * Don't print the event and packet loss warnings since the user
113 * already saw them when stopping the trace.
114 */
115 print_session_stats(session->name);
116 }
117
118 ret_code = lttng_destroy_session_ext(session->name, &handle);
119 if (ret_code != LTTNG_OK) {
120 ret = -ret_code;
121 goto error;
122 }
123
124 if (opt_no_wait) {
125 goto skip_wait_rotation;
126 }
127
128 do {
129 status = lttng_destruction_handle_wait_for_completion(handle,
130 DEFAULT_DATA_AVAILABILITY_WAIT_TIME_US / USEC_PER_MSEC);
131 switch (status) {
132 case LTTNG_DESTRUCTION_HANDLE_STATUS_TIMEOUT:
133 if (!printed_wait_msg) {
134 _MSG("Waiting for destruction of session \"%s\"",
135 session->name);
136 printed_wait_msg = true;
137 }
138 _MSG(".");
139 fflush(stdout);
140 break;
141 case LTTNG_DESTRUCTION_HANDLE_STATUS_COMPLETED:
142 break;
143 default:
144 ERR("Failed to wait for the completion of the destruction of session \"%s\"",
145 session->name);
146 ret = -1;
147 goto error;
148 }
149 } while (status == LTTNG_DESTRUCTION_HANDLE_STATUS_TIMEOUT);
150
151 status = lttng_destruction_handle_get_result(handle, &ret_code);
152 if (status != LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
153 ERR("Failed to get the result of session destruction");
154 ret = -1;
155 goto error;
156 }
157 if (ret_code != LTTNG_OK) {
158 ret = -LTTNG_OK;
159 goto error;
160 }
161
162 status = lttng_destruction_handle_get_rotation_state(handle,
163 &rotation_state);
164 switch (rotation_state) {
165 case LTTNG_ROTATION_STATE_NO_ROTATION:
166 break;
167 case LTTNG_ROTATION_STATE_COMPLETED:
168 {
169 const struct lttng_trace_archive_location *location;
170
171 status = lttng_destruction_handle_get_archive_location(handle,
172 &location);
173 if (status == LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
174 if (printed_wait_msg) {
175 MSG("");
176 printed_wait_msg = false;
177 }
178 ret = print_trace_archive_location(location,
179 session->name);
180 if (ret) {
181 ERR("Failed to print the location of trace archive");
182 goto skip_wait_rotation;
183 }
184 break;
185 }
186 /* fall-through. */
187 }
188 default:
189 ERR("Failed to get the location of the rotation performed during the session's destruction");
190 goto skip_wait_rotation;
191 }
192 skip_wait_rotation:
193 MSG("%sSession \"%s\" destroyed", printed_wait_msg ? "\n" : "",
194 session->name);
195 printed_wait_msg = false;
196
197 session_name = get_session_name_quiet();
198 if (session_name && !strncmp(session->name, session_name, NAME_MAX)) {
199 config_destroy_default();
200 }
201
202 if (lttng_opt_mi) {
203 ret = mi_lttng_session(writer, session, 0);
204 if (ret) {
205 ret = CMD_ERROR;
206 goto error;
207 }
208 }
209
210 ret = CMD_SUCCESS;
211 error:
212 if (printed_wait_msg) {
213 MSG("");
214 }
215 lttng_destruction_handle_destroy(handle);
216 free(session_name);
217 return ret;
218 }
219
220 /*
221 * destroy_all_sessions
222 *
223 * Call destroy_sessions for each registered sessions
224 */
225 static int destroy_all_sessions(struct lttng_session *sessions, int count)
226 {
227 int i, ret = CMD_SUCCESS;
228
229 if (count == 0) {
230 MSG("No session found, nothing to do.");
231 } else if (count < 0) {
232 ERR("%s", lttng_strerror(ret));
233 goto error;
234 }
235
236 for (i = 0; i < count; i++) {
237 ret = destroy_session(&sessions[i]);
238 if (ret < 0) {
239 goto error;
240 }
241 }
242 error:
243 return ret;
244 }
245
246 /*
247 * The 'destroy <options>' first level command
248 */
249 int cmd_destroy(int argc, const char **argv)
250 {
251 int opt;
252 int ret = CMD_SUCCESS , i, command_ret = CMD_SUCCESS, success = 1;
253 static poptContext pc;
254 char *session_name = NULL;
255 const char *leftover = NULL;
256
257 struct lttng_session *sessions;
258 int count;
259 int found;
260
261 pc = poptGetContext(NULL, argc, argv, long_options, 0);
262 poptReadDefaultConfig(pc, 0);
263
264 while ((opt = poptGetNextOpt(pc)) != -1) {
265 switch (opt) {
266 case OPT_HELP:
267 SHOW_HELP();
268 break;
269 case OPT_LIST_OPTIONS:
270 list_cmd_options(stdout, long_options);
271 break;
272 default:
273 ret = CMD_UNDEFINED;
274 break;
275 }
276 goto end;
277 }
278
279 /* Mi preparation */
280 if (lttng_opt_mi) {
281 writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
282 if (!writer) {
283 ret = -LTTNG_ERR_NOMEM;
284 goto end;
285 }
286
287 /* Open command element */
288 ret = mi_lttng_writer_command_open(writer,
289 mi_lttng_element_command_destroy);
290 if (ret) {
291 ret = CMD_ERROR;
292 goto end;
293 }
294
295 /* Open output element */
296 ret = mi_lttng_writer_open_element(writer,
297 mi_lttng_element_command_output);
298 if (ret) {
299 ret = CMD_ERROR;
300 goto end;
301 }
302
303 /* For validation and semantic purpose we open a sessions element */
304 ret = mi_lttng_sessions_open(writer);
305 if (ret) {
306 ret = CMD_ERROR;
307 goto end;
308 }
309 }
310
311 /* Recuperate all sessions for further operation */
312 count = lttng_list_sessions(&sessions);
313 if (count < 0) {
314 ERR("%s", lttng_strerror(count));
315 command_ret = CMD_ERROR;
316 success = 0;
317 goto mi_closing;
318 }
319
320 /* Ignore session name in case all sessions are to be destroyed */
321 if (opt_destroy_all) {
322 command_ret = destroy_all_sessions(sessions, count);
323 if (command_ret) {
324 success = 0;
325 }
326 } else {
327 opt_session_name = (char *) poptGetArg(pc);
328
329 if (!opt_session_name) {
330 /* No session name specified, lookup default */
331 session_name = get_session_name();
332 if (session_name == NULL) {
333 command_ret = CMD_ERROR;
334 success = 0;
335 goto mi_closing;
336 }
337 } else {
338 session_name = opt_session_name;
339 }
340
341 /* Find the corresponding lttng_session struct */
342 found = 0;
343 for (i = 0; i < count; i++) {
344 if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) {
345 found = 1;
346 command_ret = destroy_session(&sessions[i]);
347 if (command_ret) {
348 success = 0;
349 }
350
351 }
352 }
353
354 if (!found) {
355 ERR("Session name %s not found", session_name);
356 command_ret = LTTNG_ERR_SESS_NOT_FOUND;
357 success = 0;
358 goto mi_closing;
359 }
360 }
361
362 leftover = poptGetArg(pc);
363 if (leftover) {
364 ERR("Unknown argument: %s", leftover);
365 ret = CMD_ERROR;
366 success = 0;
367 goto mi_closing;
368 }
369
370 mi_closing:
371 /* Mi closing */
372 if (lttng_opt_mi) {
373 /* Close sessions and output element element */
374 ret = mi_lttng_close_multi_element(writer, 2);
375 if (ret) {
376 ret = CMD_ERROR;
377 goto end;
378 }
379
380 /* Success ? */
381 ret = mi_lttng_writer_write_element_bool(writer,
382 mi_lttng_element_command_success, success);
383 if (ret) {
384 ret = CMD_ERROR;
385 goto end;
386 }
387
388 /* Command element close */
389 ret = mi_lttng_writer_command_close(writer);
390 if (ret) {
391 ret = CMD_ERROR;
392 goto end;
393 }
394 }
395 end:
396 /* Mi clean-up */
397 if (writer && mi_lttng_writer_destroy(writer)) {
398 /* Preserve original error code */
399 ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL;
400 }
401
402 if (opt_session_name == NULL) {
403 free(session_name);
404 }
405
406 /* Overwrite ret if an error occurred during destroy_session/all */
407 ret = command_ret ? command_ret : ret;
408
409 poptFreeContext(pc);
410 return ret;
411 }
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