2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
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.
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.
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.
24 #include <sys/types.h>
27 #include "../command.h"
29 #include <common/mi-lttng.h>
30 #include <common/sessiond-comm/sessiond-comm.h>
32 static char *opt_session_name
;
33 static int opt_destroy_all
;
36 static struct mi_writer
*writer
;
43 static struct poptOption long_options
[] = {
44 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
45 {"help", 'h', POPT_ARG_NONE
, 0, OPT_HELP
, 0, 0},
46 {"all", 'a', POPT_ARG_VAL
, &opt_destroy_all
, 1, 0, 0},
47 {"list-options", 0, POPT_ARG_NONE
, NULL
, OPT_LIST_OPTIONS
, NULL
, NULL
},
54 static void usage(FILE *ofp
)
56 fprintf(ofp
, "usage: lttng destroy [NAME] [OPTIONS]\n");
58 fprintf(ofp
, "Where NAME is an optional session name. If not specified, lttng will\n");
59 fprintf(ofp
, "get it from the configuration directory (.lttng).\n");
61 fprintf(ofp
, "Options:\n");
62 fprintf(ofp
, " -h, --help Show this help\n");
63 fprintf(ofp
, " -a, --all Destroy all sessions\n");
64 fprintf(ofp
, " --list-options Simple listing of options\n");
71 * Unregister the provided session to the session daemon. On success, removes
72 * the default configuration.
74 static int destroy_session(struct lttng_session
*session
)
78 ret
= lttng_destroy_session(session
->name
);
81 case LTTNG_ERR_SESS_NOT_FOUND
:
82 WARN("Session name %s not found", session
->name
);
85 ERR("%s", lttng_strerror(ret
));
91 MSG("Session %s destroyed", session
->name
);
92 config_destroy_default();
95 ret
= mi_lttng_session(writer
, session
, 0);
108 * destroy_all_sessions
110 * Call destroy_sessions for each registered sessions
112 static int destroy_all_sessions(struct lttng_session
*sessions
, int count
)
114 int i
, ret
= CMD_SUCCESS
;
117 MSG("No session found, nothing to do.");
118 } else if (count
< 0) {
119 ERR("%s", lttng_strerror(ret
));
123 for (i
= 0; i
< count
; i
++) {
124 ret
= destroy_session(&sessions
[i
]);
134 * The 'destroy <options>' first level command
136 int cmd_destroy(int argc
, const char **argv
)
139 int ret
= CMD_SUCCESS
, i
, command_ret
= CMD_SUCCESS
, success
= 1;
140 static poptContext pc
;
141 char *session_name
= NULL
;
143 struct lttng_session
*sessions
;
147 pc
= poptGetContext(NULL
, argc
, argv
, long_options
, 0);
148 poptReadDefaultConfig(pc
, 0);
150 while ((opt
= poptGetNextOpt(pc
)) != -1) {
155 case OPT_LIST_OPTIONS
:
156 list_cmd_options(stdout
, long_options
);
168 writer
= mi_lttng_writer_create(fileno(stdout
), lttng_opt_mi
);
170 ret
= -LTTNG_ERR_NOMEM
;
174 /* Open command element */
175 ret
= mi_lttng_writer_command_open(writer
,
176 mi_lttng_element_command_destroy
);
182 /* Open output element */
183 ret
= mi_lttng_writer_open_element(writer
,
184 mi_lttng_element_command_output
);
190 /* For validation and semantic purpose we open a sessions element */
191 ret
= mi_lttng_sessions_open(writer
);
198 /* Recuperate all sessions for further operation */
199 count
= lttng_list_sessions(&sessions
);
206 /* Ignore session name in case all sessions are to be destroyed */
207 if (opt_destroy_all
) {
208 command_ret
= destroy_all_sessions(sessions
, count
);
213 opt_session_name
= (char *) poptGetArg(pc
);
215 if (opt_session_name
== NULL
) {
216 /* No session name specified, lookup default */
217 session_name
= get_session_name();
218 if (session_name
== NULL
) {
219 command_ret
= CMD_ERROR
;
224 session_name
= opt_session_name
;
227 /* Find the corresponding lttng_session struct */
229 for (i
= 0; i
< count
; i
++) {
230 if (strncmp(sessions
[i
].name
, session_name
, NAME_MAX
) == 0) {
232 command_ret
= destroy_session(&sessions
[i
]);
241 ERR("Session name %s not found", session_name
);
242 command_ret
= LTTNG_ERR_SESS_NOT_FOUND
;
251 /* Close sessions and output element element */
252 ret
= mi_lttng_close_multi_element(writer
, 2);
259 ret
= mi_lttng_writer_write_element_bool(writer
,
260 mi_lttng_element_command_success
, success
);
266 /* Command element close */
267 ret
= mi_lttng_writer_command_close(writer
);
275 if (writer
&& mi_lttng_writer_destroy(writer
)) {
276 /* Preserve original error code */
277 ret
= ret
? ret
: -LTTNG_ERR_MI_IO_FAIL
;
280 if (opt_session_name
== NULL
) {
284 /* Overwrite ret if an error occurred during destroy_session/all */
285 ret
= command_ret
? command_ret
: ret
;