lttng: remove usage strings from commands
[lttng-tools.git] / src / bin / lttng / commands / destroy.c
CommitLineData
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
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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.
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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 *
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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.
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16 */
17
6c1c0768 18#define _LGPL_SOURCE
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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>
20fb9e02 26#include <stdbool.h>
f3ed775e 27
c399183f 28#include "../command.h"
f3ed775e 29
65f25c66 30#include <common/mi-lttng.h>
42224349 31#include <common/sessiond-comm/sessiond-comm.h>
1dac0189 32#include <common/utils.h>
42224349 33
fd076c09 34static char *opt_session_name;
b09ee5ba 35static int opt_destroy_all;
e20ee7c2 36static int opt_no_wait;
f3ed775e 37
65f25c66
JRJ
38/* Mi writer */
39static struct mi_writer *writer;
40
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41enum {
42 OPT_HELP = 1,
679b4943 43 OPT_LIST_OPTIONS,
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44};
45
46static struct poptOption long_options[] = {
47 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
48 {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
b09ee5ba 49 {"all", 'a', POPT_ARG_VAL, &opt_destroy_all, 1, 0, 0},
679b4943 50 {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
e20ee7c2 51 {"no-wait", 'n', POPT_ARG_VAL, &opt_no_wait, 1, 0, 0},
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52 {0, 0, 0, 0, 0, 0, 0}
53};
54
f3ed775e 55/*
b09ee5ba
FG
56 * destroy_session
57 *
58 * Unregister the provided session to the session daemon. On success, removes
59 * the default configuration.
f3ed775e 60 */
65f25c66 61static int destroy_session(struct lttng_session *session)
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62{
63 int ret;
1dac0189 64 char *session_name = NULL;
20fb9e02 65 bool session_was_stopped;
f3ed775e 66
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67 ret = lttng_stop_tracing_no_wait(session->name);
68 if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
69 ERR("%s", lttng_strerror(ret));
70 }
20fb9e02 71 session_was_stopped = ret == -LTTNG_ERR_TRACE_ALREADY_STOPPED;
e20ee7c2
JD
72 if (!opt_no_wait) {
73 _MSG("Waiting for data availability");
74 fflush(stdout);
75 do {
76 ret = lttng_data_pending(session->name);
77 if (ret < 0) {
78 /* Return the data available call error. */
79 goto error;
80 }
81
82 /*
83 * Data sleep time before retrying (in usec). Don't sleep if the call
84 * returned value indicates availability.
85 */
86 if (ret) {
87 usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME);
88 _MSG(".");
89 fflush(stdout);
90 }
91 } while (ret != 0);
92 MSG("");
93 }
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JD
94 if (!session_was_stopped) {
95 /*
96 * Don't print the event and packet loss warnings since the user
97 * already saw them when stopping the trace.
98 */
99 print_session_stats(session->name);
100 }
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101
102 ret = lttng_destroy_session_no_wait(session->name);
f3ed775e 103 if (ret < 0) {
b09ee5ba 104 goto error;
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105 }
106
65f25c66 107 MSG("Session %s destroyed", session->name);
1dac0189
PPM
108
109 session_name = get_session_name_quiet();
110 if (session_name && !strncmp(session->name, session_name, NAME_MAX)) {
111 config_destroy_default();
112 }
65f25c66
JRJ
113
114 if (lttng_opt_mi) {
115 ret = mi_lttng_session(writer, session, 0);
116 if (ret) {
117 ret = CMD_ERROR;
118 goto error;
119 }
120 }
121
f3ed775e 122 ret = CMD_SUCCESS;
b09ee5ba 123error:
1dac0189 124 free(session_name);
b09ee5ba
FG
125 return ret;
126}
f3ed775e 127
b09ee5ba
FG
128/*
129 * destroy_all_sessions
130 *
131 * Call destroy_sessions for each registered sessions
132 */
65f25c66 133static int destroy_all_sessions(struct lttng_session *sessions, int count)
b09ee5ba 134{
65f25c66 135 int i, ret = CMD_SUCCESS;
b09ee5ba 136
b09ee5ba
FG
137 if (count == 0) {
138 MSG("No session found, nothing to do.");
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139 } else if (count < 0) {
140 ERR("%s", lttng_strerror(ret));
141 goto error;
b09ee5ba 142 }
60e835ca 143
b09ee5ba 144 for (i = 0; i < count; i++) {
65f25c66 145 ret = destroy_session(&sessions[i]);
b09ee5ba
FG
146 if (ret < 0) {
147 goto error;
148 }
b73d0b29 149 }
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150error:
151 return ret;
152}
153
154/*
843f5df9 155 * The 'destroy <options>' first level command
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156 */
157int cmd_destroy(int argc, const char **argv)
158{
b09ee5ba 159 int opt;
65f25c66 160 int ret = CMD_SUCCESS , i, command_ret = CMD_SUCCESS, success = 1;
f3ed775e 161 static poptContext pc;
b09ee5ba 162 char *session_name = NULL;
f3ed775e 163
65f25c66
JRJ
164 struct lttng_session *sessions;
165 int count;
166 int found;
167
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168 pc = poptGetContext(NULL, argc, argv, long_options, 0);
169 poptReadDefaultConfig(pc, 0);
170
171 while ((opt = poptGetNextOpt(pc)) != -1) {
172 switch (opt) {
173 case OPT_HELP:
4ba92f18 174 SHOW_HELP();
b09ee5ba 175 break;
679b4943
SM
176 case OPT_LIST_OPTIONS:
177 list_cmd_options(stdout, long_options);
b09ee5ba 178 break;
f3ed775e 179 default:
f3ed775e 180 ret = CMD_UNDEFINED;
b09ee5ba 181 break;
f3ed775e 182 }
b09ee5ba 183 goto end;
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184 }
185
65f25c66 186 /* Mi preparation */
c7e35b03 187 if (lttng_opt_mi) {
65f25c66
JRJ
188 writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
189 if (!writer) {
190 ret = -LTTNG_ERR_NOMEM;
191 goto end;
192 }
193
194 /* Open command element */
195 ret = mi_lttng_writer_command_open(writer,
196 mi_lttng_element_command_destroy);
197 if (ret) {
198 ret = CMD_ERROR;
199 goto end;
200 }
201
202 /* Open output element */
203 ret = mi_lttng_writer_open_element(writer,
204 mi_lttng_element_command_output);
205 if (ret) {
206 ret = CMD_ERROR;
207 goto end;
208 }
209
210 /* For validation and semantic purpose we open a sessions element */
211 ret = mi_lttng_sessions_open(writer);
212 if (ret) {
213 ret = CMD_ERROR;
214 goto end;
215 }
216 }
217
218 /* Recuperate all sessions for further operation */
219 count = lttng_list_sessions(&sessions);
220 if (count < 0) {
221 command_ret = count;
222 success = 0;
223 goto mi_closing;
c7e35b03
JR
224 }
225
fd076c09 226 /* Ignore session name in case all sessions are to be destroyed */
b09ee5ba 227 if (opt_destroy_all) {
65f25c66
JRJ
228 command_ret = destroy_all_sessions(sessions, count);
229 if (command_ret) {
230 success = 0;
231 }
232 } else {
233 opt_session_name = (char *) poptGetArg(pc);
234
1dac0189 235 if (!opt_session_name) {
65f25c66
JRJ
236 /* No session name specified, lookup default */
237 session_name = get_session_name();
238 if (session_name == NULL) {
239 command_ret = CMD_ERROR;
240 success = 0;
241 goto mi_closing;
242 }
243 } else {
244 session_name = opt_session_name;
245 }
fd076c09 246
65f25c66
JRJ
247 /* Find the corresponding lttng_session struct */
248 found = 0;
249 for (i = 0; i < count; i++) {
250 if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) {
251 found = 1;
252 command_ret = destroy_session(&sessions[i]);
253 if (command_ret) {
254 success = 0;
255 }
fd076c09 256
65f25c66
JRJ
257 }
258 }
259
260 if (!found) {
261 ERR("Session name %s not found", session_name);
262 command_ret = LTTNG_ERR_SESS_NOT_FOUND;
263 success = 0;
264 goto mi_closing;
265 }
266 }
267
268mi_closing:
269 /* Mi closing */
270 if (lttng_opt_mi) {
271 /* Close sessions and output element element */
272 ret = mi_lttng_close_multi_element(writer, 2);
273 if (ret) {
fd076c09 274 ret = CMD_ERROR;
b09ee5ba
FG
275 goto end;
276 }
fd076c09 277
65f25c66
JRJ
278 /* Success ? */
279 ret = mi_lttng_writer_write_element_bool(writer,
280 mi_lttng_element_command_success, success);
281 if (ret) {
282 ret = CMD_ERROR;
283 goto end;
284 }
f3ed775e 285
65f25c66
JRJ
286 /* Command element close */
287 ret = mi_lttng_writer_command_close(writer);
288 if (ret) {
289 ret = CMD_ERROR;
290 goto end;
291 }
292 }
f3ed775e 293end:
65f25c66
JRJ
294 /* Mi clean-up */
295 if (writer && mi_lttng_writer_destroy(writer)) {
296 /* Preserve original error code */
297 ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL;
298 }
299
fd076c09 300 if (opt_session_name == NULL) {
b09ee5ba
FG
301 free(session_name);
302 }
fd076c09 303
65f25c66
JRJ
304 /* Overwrite ret if an error occurred during destroy_session/all */
305 ret = command_ret ? command_ret : ret;
306
fd076c09 307 poptFreeContext(pc);
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308 return ret;
309}
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