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f3ed775e DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
d14d33bf AM |
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. | |
f3ed775e DG |
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 | * | |
d14d33bf AM |
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. | |
f3ed775e DG |
16 | */ |
17 | ||
18 | #define _GNU_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 | ||
c399183f | 27 | #include "../command.h" |
f3ed775e | 28 | |
65f25c66 | 29 | #include <common/mi-lttng.h> |
42224349 | 30 | #include <common/sessiond-comm/sessiond-comm.h> |
7dd11af8 | 31 | #include <common/utils.h> |
42224349 | 32 | |
fd076c09 | 33 | static char *opt_session_name; |
b09ee5ba | 34 | static int opt_destroy_all; |
f3ed775e | 35 | |
65f25c66 JRJ |
36 | /* Mi writer */ |
37 | static struct mi_writer *writer; | |
38 | ||
f3ed775e DG |
39 | enum { |
40 | OPT_HELP = 1, | |
679b4943 | 41 | OPT_LIST_OPTIONS, |
f3ed775e DG |
42 | }; |
43 | ||
44 | static struct poptOption long_options[] = { | |
45 | /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */ | |
46 | {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0}, | |
b09ee5ba | 47 | {"all", 'a', POPT_ARG_VAL, &opt_destroy_all, 1, 0, 0}, |
679b4943 | 48 | {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL}, |
f3ed775e DG |
49 | {0, 0, 0, 0, 0, 0, 0} |
50 | }; | |
51 | ||
52 | /* | |
53 | * usage | |
54 | */ | |
55 | static void usage(FILE *ofp) | |
56 | { | |
32a6298d | 57 | fprintf(ofp, "usage: lttng destroy [NAME] [OPTIONS]\n"); |
f3ed775e DG |
58 | fprintf(ofp, "\n"); |
59 | fprintf(ofp, "Where NAME is an optional session name. If not specified, lttng will\n"); | |
60 | fprintf(ofp, "get it from the configuration directory (.lttng).\n"); | |
61 | fprintf(ofp, "\n"); | |
32a6298d | 62 | fprintf(ofp, "Options:\n"); |
f3ed775e | 63 | fprintf(ofp, " -h, --help Show this help\n"); |
b09ee5ba | 64 | fprintf(ofp, " -a, --all Destroy all sessions\n"); |
27221701 | 65 | fprintf(ofp, " --list-options Simple listing of options\n"); |
f3ed775e DG |
66 | fprintf(ofp, "\n"); |
67 | } | |
68 | ||
69 | /* | |
b09ee5ba FG |
70 | * destroy_session |
71 | * | |
72 | * Unregister the provided session to the session daemon. On success, removes | |
73 | * the default configuration. | |
f3ed775e | 74 | */ |
65f25c66 | 75 | static int destroy_session(struct lttng_session *session) |
f3ed775e DG |
76 | { |
77 | int ret; | |
7dd11af8 | 78 | char *session_name = NULL; |
f3ed775e | 79 | |
65f25c66 | 80 | ret = lttng_destroy_session(session->name); |
f3ed775e | 81 | if (ret < 0) { |
42224349 | 82 | switch (-ret) { |
f73fabfd | 83 | case LTTNG_ERR_SESS_NOT_FOUND: |
65f25c66 | 84 | WARN("Session name %s not found", session->name); |
42224349 DG |
85 | break; |
86 | default: | |
60e835ca | 87 | ERR("%s", lttng_strerror(ret)); |
42224349 DG |
88 | break; |
89 | } | |
b09ee5ba | 90 | goto error; |
f3ed775e DG |
91 | } |
92 | ||
65f25c66 | 93 | MSG("Session %s destroyed", session->name); |
7dd11af8 PPM |
94 | |
95 | session_name = get_session_name_quiet(); | |
96 | if (session_name && !strncmp(session->name, session_name, NAME_MAX)) { | |
97 | config_destroy_default(); | |
98 | } | |
65f25c66 JRJ |
99 | |
100 | if (lttng_opt_mi) { | |
101 | ret = mi_lttng_session(writer, session, 0); | |
102 | if (ret) { | |
103 | ret = CMD_ERROR; | |
104 | goto error; | |
105 | } | |
106 | } | |
107 | ||
f3ed775e | 108 | ret = CMD_SUCCESS; |
b09ee5ba | 109 | error: |
7dd11af8 | 110 | free(session_name); |
b09ee5ba FG |
111 | return ret; |
112 | } | |
f3ed775e | 113 | |
b09ee5ba FG |
114 | /* |
115 | * destroy_all_sessions | |
116 | * | |
117 | * Call destroy_sessions for each registered sessions | |
118 | */ | |
65f25c66 | 119 | static int destroy_all_sessions(struct lttng_session *sessions, int count) |
b09ee5ba | 120 | { |
65f25c66 | 121 | int i, ret = CMD_SUCCESS; |
b09ee5ba | 122 | |
b09ee5ba FG |
123 | if (count == 0) { |
124 | MSG("No session found, nothing to do."); | |
60e835ca DG |
125 | } else if (count < 0) { |
126 | ERR("%s", lttng_strerror(ret)); | |
127 | goto error; | |
b09ee5ba | 128 | } |
60e835ca | 129 | |
b09ee5ba | 130 | for (i = 0; i < count; i++) { |
65f25c66 | 131 | ret = destroy_session(&sessions[i]); |
b09ee5ba FG |
132 | if (ret < 0) { |
133 | goto error; | |
134 | } | |
b73d0b29 | 135 | } |
f3ed775e DG |
136 | error: |
137 | return ret; | |
138 | } | |
139 | ||
140 | /* | |
843f5df9 | 141 | * The 'destroy <options>' first level command |
f3ed775e DG |
142 | */ |
143 | int cmd_destroy(int argc, const char **argv) | |
144 | { | |
b09ee5ba | 145 | int opt; |
65f25c66 | 146 | int ret = CMD_SUCCESS , i, command_ret = CMD_SUCCESS, success = 1; |
f3ed775e | 147 | static poptContext pc; |
b09ee5ba | 148 | char *session_name = NULL; |
f3ed775e | 149 | |
65f25c66 JRJ |
150 | struct lttng_session *sessions; |
151 | int count; | |
152 | int found; | |
153 | ||
f3ed775e DG |
154 | pc = poptGetContext(NULL, argc, argv, long_options, 0); |
155 | poptReadDefaultConfig(pc, 0); | |
156 | ||
157 | while ((opt = poptGetNextOpt(pc)) != -1) { | |
158 | switch (opt) { | |
159 | case OPT_HELP: | |
ca1c3607 | 160 | usage(stdout); |
b09ee5ba | 161 | break; |
679b4943 SM |
162 | case OPT_LIST_OPTIONS: |
163 | list_cmd_options(stdout, long_options); | |
b09ee5ba | 164 | break; |
f3ed775e DG |
165 | default: |
166 | usage(stderr); | |
167 | ret = CMD_UNDEFINED; | |
b09ee5ba | 168 | break; |
f3ed775e | 169 | } |
b09ee5ba | 170 | goto end; |
f3ed775e DG |
171 | } |
172 | ||
65f25c66 | 173 | /* Mi preparation */ |
c7e35b03 | 174 | if (lttng_opt_mi) { |
65f25c66 JRJ |
175 | writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi); |
176 | if (!writer) { | |
177 | ret = -LTTNG_ERR_NOMEM; | |
178 | goto end; | |
179 | } | |
180 | ||
181 | /* Open command element */ | |
182 | ret = mi_lttng_writer_command_open(writer, | |
183 | mi_lttng_element_command_destroy); | |
184 | if (ret) { | |
185 | ret = CMD_ERROR; | |
186 | goto end; | |
187 | } | |
188 | ||
189 | /* Open output element */ | |
190 | ret = mi_lttng_writer_open_element(writer, | |
191 | mi_lttng_element_command_output); | |
192 | if (ret) { | |
193 | ret = CMD_ERROR; | |
194 | goto end; | |
195 | } | |
196 | ||
197 | /* For validation and semantic purpose we open a sessions element */ | |
198 | ret = mi_lttng_sessions_open(writer); | |
199 | if (ret) { | |
200 | ret = CMD_ERROR; | |
201 | goto end; | |
202 | } | |
203 | } | |
204 | ||
205 | /* Recuperate all sessions for further operation */ | |
206 | count = lttng_list_sessions(&sessions); | |
207 | if (count < 0) { | |
208 | command_ret = count; | |
209 | success = 0; | |
210 | goto mi_closing; | |
c7e35b03 JR |
211 | } |
212 | ||
fd076c09 | 213 | /* Ignore session name in case all sessions are to be destroyed */ |
b09ee5ba | 214 | if (opt_destroy_all) { |
65f25c66 JRJ |
215 | command_ret = destroy_all_sessions(sessions, count); |
216 | if (command_ret) { | |
217 | success = 0; | |
218 | } | |
219 | } else { | |
220 | opt_session_name = (char *) poptGetArg(pc); | |
221 | ||
7dd11af8 | 222 | if (!opt_session_name) { |
65f25c66 JRJ |
223 | /* No session name specified, lookup default */ |
224 | session_name = get_session_name(); | |
225 | if (session_name == NULL) { | |
226 | command_ret = CMD_ERROR; | |
227 | success = 0; | |
228 | goto mi_closing; | |
229 | } | |
230 | } else { | |
231 | session_name = opt_session_name; | |
232 | } | |
fd076c09 | 233 | |
65f25c66 JRJ |
234 | /* Find the corresponding lttng_session struct */ |
235 | found = 0; | |
236 | for (i = 0; i < count; i++) { | |
237 | if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) { | |
238 | found = 1; | |
239 | command_ret = destroy_session(&sessions[i]); | |
240 | if (command_ret) { | |
241 | success = 0; | |
242 | } | |
fd076c09 | 243 | |
65f25c66 JRJ |
244 | } |
245 | } | |
246 | ||
247 | if (!found) { | |
248 | ERR("Session name %s not found", session_name); | |
249 | command_ret = LTTNG_ERR_SESS_NOT_FOUND; | |
250 | success = 0; | |
251 | goto mi_closing; | |
252 | } | |
253 | } | |
254 | ||
255 | mi_closing: | |
256 | /* Mi closing */ | |
257 | if (lttng_opt_mi) { | |
258 | /* Close sessions and output element element */ | |
259 | ret = mi_lttng_close_multi_element(writer, 2); | |
260 | if (ret) { | |
fd076c09 | 261 | ret = CMD_ERROR; |
b09ee5ba FG |
262 | goto end; |
263 | } | |
fd076c09 | 264 | |
65f25c66 JRJ |
265 | /* Success ? */ |
266 | ret = mi_lttng_writer_write_element_bool(writer, | |
267 | mi_lttng_element_command_success, success); | |
268 | if (ret) { | |
269 | ret = CMD_ERROR; | |
270 | goto end; | |
271 | } | |
f3ed775e | 272 | |
65f25c66 JRJ |
273 | /* Command element close */ |
274 | ret = mi_lttng_writer_command_close(writer); | |
275 | if (ret) { | |
276 | ret = CMD_ERROR; | |
277 | goto end; | |
278 | } | |
279 | } | |
f3ed775e | 280 | end: |
65f25c66 JRJ |
281 | /* Mi clean-up */ |
282 | if (writer && mi_lttng_writer_destroy(writer)) { | |
283 | /* Preserve original error code */ | |
284 | ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL; | |
285 | } | |
286 | ||
fd076c09 | 287 | if (opt_session_name == NULL) { |
b09ee5ba FG |
288 | free(session_name); |
289 | } | |
fd076c09 | 290 | |
65f25c66 JRJ |
291 | /* Overwrite ret if an error occurred during destroy_session/all */ |
292 | ret = command_ret ? command_ret : ret; | |
293 | ||
fd076c09 | 294 | poptFreeContext(pc); |
f3ed775e DG |
295 | return ret; |
296 | } |