Set consumer's verbosity to the max level on --verbose-consumer
[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
28 #include "../command.h"
29
30 #include <common/mi-lttng.h>
31 #include <common/sessiond-comm/sessiond-comm.h>
32 #include <common/utils.h>
33
34 static char *opt_session_name;
35 static int opt_destroy_all;
36 static int opt_no_wait;
37
38 #ifdef LTTNG_EMBED_HELP
39 static const char help_msg[] =
40 #include <lttng-destroy.1.h>
41 ;
42 #endif
43
44 /* Mi writer */
45 static struct mi_writer *writer;
46
47 enum {
48 OPT_HELP = 1,
49 OPT_LIST_OPTIONS,
50 };
51
52 static struct poptOption long_options[] = {
53 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
54 {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
55 {"all", 'a', POPT_ARG_VAL, &opt_destroy_all, 1, 0, 0},
56 {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
57 {"no-wait", 'n', POPT_ARG_VAL, &opt_no_wait, 1, 0, 0},
58 {0, 0, 0, 0, 0, 0, 0}
59 };
60
61 /*
62 * destroy_session
63 *
64 * Unregister the provided session to the session daemon. On success, removes
65 * the default configuration.
66 */
67 static int destroy_session(struct lttng_session *session)
68 {
69 int ret;
70 char *session_name = NULL;
71 bool session_was_stopped;
72
73 ret = lttng_stop_tracing_no_wait(session->name);
74 if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
75 ERR("%s", lttng_strerror(ret));
76 }
77 session_was_stopped = ret == -LTTNG_ERR_TRACE_ALREADY_STOPPED;
78 if (!opt_no_wait) {
79 bool printed_wait_msg = false;
80
81 do {
82 ret = lttng_data_pending(session->name);
83 if (ret < 0) {
84 /* Return the data available call error. */
85 goto error;
86 }
87
88 /*
89 * Data sleep time before retrying (in usec). Don't sleep if the call
90 * returned value indicates availability.
91 */
92 if (ret) {
93 if (!printed_wait_msg) {
94 _MSG("Waiting for data availability");
95 fflush(stdout);
96 }
97
98 printed_wait_msg = true;
99 usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME);
100 _MSG(".");
101 fflush(stdout);
102 }
103 } while (ret != 0);
104 if (printed_wait_msg) {
105 MSG("");
106 }
107 }
108 if (!session_was_stopped) {
109 /*
110 * Don't print the event and packet loss warnings since the user
111 * already saw them when stopping the trace.
112 */
113 print_session_stats(session->name);
114 }
115
116 ret = lttng_destroy_session_no_wait(session->name);
117 if (ret < 0) {
118 goto error;
119 }
120
121 MSG("Session %s destroyed", session->name);
122
123 session_name = get_session_name_quiet();
124 if (session_name && !strncmp(session->name, session_name, NAME_MAX)) {
125 config_destroy_default();
126 }
127
128 if (lttng_opt_mi) {
129 ret = mi_lttng_session(writer, session, 0);
130 if (ret) {
131 ret = CMD_ERROR;
132 goto error;
133 }
134 }
135
136 ret = CMD_SUCCESS;
137 error:
138 free(session_name);
139 return ret;
140 }
141
142 /*
143 * destroy_all_sessions
144 *
145 * Call destroy_sessions for each registered sessions
146 */
147 static int destroy_all_sessions(struct lttng_session *sessions, int count)
148 {
149 int i, ret = CMD_SUCCESS;
150
151 if (count == 0) {
152 MSG("No session found, nothing to do.");
153 } else if (count < 0) {
154 ERR("%s", lttng_strerror(ret));
155 goto error;
156 }
157
158 for (i = 0; i < count; i++) {
159 ret = destroy_session(&sessions[i]);
160 if (ret < 0) {
161 goto error;
162 }
163 }
164 error:
165 return ret;
166 }
167
168 /*
169 * The 'destroy <options>' first level command
170 */
171 int cmd_destroy(int argc, const char **argv)
172 {
173 int opt;
174 int ret = CMD_SUCCESS , i, command_ret = CMD_SUCCESS, success = 1;
175 static poptContext pc;
176 char *session_name = NULL;
177 const char *leftover = NULL;
178
179 struct lttng_session *sessions;
180 int count;
181 int found;
182
183 pc = poptGetContext(NULL, argc, argv, long_options, 0);
184 poptReadDefaultConfig(pc, 0);
185
186 while ((opt = poptGetNextOpt(pc)) != -1) {
187 switch (opt) {
188 case OPT_HELP:
189 SHOW_HELP();
190 break;
191 case OPT_LIST_OPTIONS:
192 list_cmd_options(stdout, long_options);
193 break;
194 default:
195 ret = CMD_UNDEFINED;
196 break;
197 }
198 goto end;
199 }
200
201 /* Mi preparation */
202 if (lttng_opt_mi) {
203 writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
204 if (!writer) {
205 ret = -LTTNG_ERR_NOMEM;
206 goto end;
207 }
208
209 /* Open command element */
210 ret = mi_lttng_writer_command_open(writer,
211 mi_lttng_element_command_destroy);
212 if (ret) {
213 ret = CMD_ERROR;
214 goto end;
215 }
216
217 /* Open output element */
218 ret = mi_lttng_writer_open_element(writer,
219 mi_lttng_element_command_output);
220 if (ret) {
221 ret = CMD_ERROR;
222 goto end;
223 }
224
225 /* For validation and semantic purpose we open a sessions element */
226 ret = mi_lttng_sessions_open(writer);
227 if (ret) {
228 ret = CMD_ERROR;
229 goto end;
230 }
231 }
232
233 /* Recuperate all sessions for further operation */
234 count = lttng_list_sessions(&sessions);
235 if (count < 0) {
236 ERR("%s", lttng_strerror(count));
237 command_ret = CMD_ERROR;
238 success = 0;
239 goto mi_closing;
240 }
241
242 /* Ignore session name in case all sessions are to be destroyed */
243 if (opt_destroy_all) {
244 command_ret = destroy_all_sessions(sessions, count);
245 if (command_ret) {
246 success = 0;
247 }
248 } else {
249 opt_session_name = (char *) poptGetArg(pc);
250
251 if (!opt_session_name) {
252 /* No session name specified, lookup default */
253 session_name = get_session_name();
254 if (session_name == NULL) {
255 command_ret = CMD_ERROR;
256 success = 0;
257 goto mi_closing;
258 }
259 } else {
260 session_name = opt_session_name;
261 }
262
263 /* Find the corresponding lttng_session struct */
264 found = 0;
265 for (i = 0; i < count; i++) {
266 if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) {
267 found = 1;
268 command_ret = destroy_session(&sessions[i]);
269 if (command_ret) {
270 success = 0;
271 }
272
273 }
274 }
275
276 if (!found) {
277 ERR("Session name %s not found", session_name);
278 command_ret = LTTNG_ERR_SESS_NOT_FOUND;
279 success = 0;
280 goto mi_closing;
281 }
282 }
283
284 leftover = poptGetArg(pc);
285 if (leftover) {
286 ERR("Unknown argument: %s", leftover);
287 ret = CMD_ERROR;
288 success = 0;
289 goto mi_closing;
290 }
291
292 mi_closing:
293 /* Mi closing */
294 if (lttng_opt_mi) {
295 /* Close sessions and output element element */
296 ret = mi_lttng_close_multi_element(writer, 2);
297 if (ret) {
298 ret = CMD_ERROR;
299 goto end;
300 }
301
302 /* Success ? */
303 ret = mi_lttng_writer_write_element_bool(writer,
304 mi_lttng_element_command_success, success);
305 if (ret) {
306 ret = CMD_ERROR;
307 goto end;
308 }
309
310 /* Command element close */
311 ret = mi_lttng_writer_command_close(writer);
312 if (ret) {
313 ret = CMD_ERROR;
314 goto end;
315 }
316 }
317 end:
318 /* Mi clean-up */
319 if (writer && mi_lttng_writer_destroy(writer)) {
320 /* Preserve original error code */
321 ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL;
322 }
323
324 if (opt_session_name == NULL) {
325 free(session_name);
326 }
327
328 /* Overwrite ret if an error occurred during destroy_session/all */
329 ret = command_ret ? command_ret : ret;
330
331 poptFreeContext(pc);
332 return ret;
333 }
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