Clean-up: lttng: check status returned when checking rotation state
[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 if (status != LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
165 ERR("Failed to get rotation state from destruction handle");
166 goto skip_wait_rotation;
167 }
168 switch (rotation_state) {
169 case LTTNG_ROTATION_STATE_NO_ROTATION:
170 break;
171 case LTTNG_ROTATION_STATE_COMPLETED:
172 {
173 const struct lttng_trace_archive_location *location;
174
175 status = lttng_destruction_handle_get_archive_location(handle,
176 &location);
177 if (status == LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
178 if (printed_wait_msg) {
179 MSG("");
180 printed_wait_msg = false;
181 }
182 ret = print_trace_archive_location(location,
183 session->name);
184 if (ret) {
185 ERR("Failed to print the location of trace archive");
186 goto skip_wait_rotation;
187 }
188 break;
189 }
190 /* fall-through. */
191 }
192 default:
193 ERR("Failed to get the location of the rotation performed during the session's destruction");
194 goto skip_wait_rotation;
195 }
196 skip_wait_rotation:
197 MSG("%sSession \"%s\" destroyed", printed_wait_msg ? "\n" : "",
198 session->name);
199 printed_wait_msg = false;
200
201 session_name = get_session_name_quiet();
202 if (session_name && !strncmp(session->name, session_name, NAME_MAX)) {
203 config_destroy_default();
204 }
205
206 if (lttng_opt_mi) {
207 ret = mi_lttng_session(writer, session, 0);
208 if (ret) {
209 ret = CMD_ERROR;
210 goto error;
211 }
212 }
213
214 ret = CMD_SUCCESS;
215 error:
216 if (printed_wait_msg) {
217 MSG("");
218 }
219 lttng_destruction_handle_destroy(handle);
220 free(session_name);
221 return ret;
222 }
223
224 /*
225 * destroy_all_sessions
226 *
227 * Call destroy_sessions for each registered sessions
228 */
229 static int destroy_all_sessions(struct lttng_session *sessions, int count)
230 {
231 int i, ret = CMD_SUCCESS;
232
233 if (count == 0) {
234 MSG("No session found, nothing to do.");
235 } else if (count < 0) {
236 ERR("%s", lttng_strerror(ret));
237 goto error;
238 }
239
240 for (i = 0; i < count; i++) {
241 ret = destroy_session(&sessions[i]);
242 if (ret < 0) {
243 goto error;
244 }
245 }
246 error:
247 return ret;
248 }
249
250 /*
251 * The 'destroy <options>' first level command
252 */
253 int cmd_destroy(int argc, const char **argv)
254 {
255 int opt;
256 int ret = CMD_SUCCESS , i, command_ret = CMD_SUCCESS, success = 1;
257 static poptContext pc;
258 char *session_name = NULL;
259 const char *leftover = NULL;
260
261 struct lttng_session *sessions;
262 int count;
263 int found;
264
265 pc = poptGetContext(NULL, argc, argv, long_options, 0);
266 poptReadDefaultConfig(pc, 0);
267
268 while ((opt = poptGetNextOpt(pc)) != -1) {
269 switch (opt) {
270 case OPT_HELP:
271 SHOW_HELP();
272 break;
273 case OPT_LIST_OPTIONS:
274 list_cmd_options(stdout, long_options);
275 break;
276 default:
277 ret = CMD_UNDEFINED;
278 break;
279 }
280 goto end;
281 }
282
283 /* Mi preparation */
284 if (lttng_opt_mi) {
285 writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
286 if (!writer) {
287 ret = -LTTNG_ERR_NOMEM;
288 goto end;
289 }
290
291 /* Open command element */
292 ret = mi_lttng_writer_command_open(writer,
293 mi_lttng_element_command_destroy);
294 if (ret) {
295 ret = CMD_ERROR;
296 goto end;
297 }
298
299 /* Open output element */
300 ret = mi_lttng_writer_open_element(writer,
301 mi_lttng_element_command_output);
302 if (ret) {
303 ret = CMD_ERROR;
304 goto end;
305 }
306
307 /* For validation and semantic purpose we open a sessions element */
308 ret = mi_lttng_sessions_open(writer);
309 if (ret) {
310 ret = CMD_ERROR;
311 goto end;
312 }
313 }
314
315 /* Recuperate all sessions for further operation */
316 count = lttng_list_sessions(&sessions);
317 if (count < 0) {
318 ERR("%s", lttng_strerror(count));
319 command_ret = CMD_ERROR;
320 success = 0;
321 goto mi_closing;
322 }
323
324 /* Ignore session name in case all sessions are to be destroyed */
325 if (opt_destroy_all) {
326 command_ret = destroy_all_sessions(sessions, count);
327 if (command_ret) {
328 success = 0;
329 }
330 } else {
331 opt_session_name = (char *) poptGetArg(pc);
332
333 if (!opt_session_name) {
334 /* No session name specified, lookup default */
335 session_name = get_session_name();
336 if (session_name == NULL) {
337 command_ret = CMD_ERROR;
338 success = 0;
339 goto mi_closing;
340 }
341 } else {
342 session_name = opt_session_name;
343 }
344
345 /* Find the corresponding lttng_session struct */
346 found = 0;
347 for (i = 0; i < count; i++) {
348 if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) {
349 found = 1;
350 command_ret = destroy_session(&sessions[i]);
351 if (command_ret) {
352 success = 0;
353 }
354
355 }
356 }
357
358 if (!found) {
359 ERR("Session name %s not found", session_name);
360 command_ret = LTTNG_ERR_SESS_NOT_FOUND;
361 success = 0;
362 goto mi_closing;
363 }
364 }
365
366 leftover = poptGetArg(pc);
367 if (leftover) {
368 ERR("Unknown argument: %s", leftover);
369 ret = CMD_ERROR;
370 success = 0;
371 goto mi_closing;
372 }
373
374 mi_closing:
375 /* Mi closing */
376 if (lttng_opt_mi) {
377 /* Close sessions and output element element */
378 ret = mi_lttng_close_multi_element(writer, 2);
379 if (ret) {
380 ret = CMD_ERROR;
381 goto end;
382 }
383
384 /* Success ? */
385 ret = mi_lttng_writer_write_element_bool(writer,
386 mi_lttng_element_command_success, success);
387 if (ret) {
388 ret = CMD_ERROR;
389 goto end;
390 }
391
392 /* Command element close */
393 ret = mi_lttng_writer_command_close(writer);
394 if (ret) {
395 ret = CMD_ERROR;
396 goto end;
397 }
398 }
399 end:
400 /* Mi clean-up */
401 if (writer && mi_lttng_writer_destroy(writer)) {
402 /* Preserve original error code */
403 ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL;
404 }
405
406 if (opt_session_name == NULL) {
407 free(session_name);
408 }
409
410 /* Overwrite ret if an error occurred during destroy_session/all */
411 ret = command_ret ? command_ret : ret;
412
413 poptFreeContext(pc);
414 return ret;
415 }
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