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7886d670 JR |
1 | /* |
2 | * Copyright (C) 2019 - Jonathan Rajotte-Julien <jonathan.rajotte-julien@efficios.com> | |
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_clear_all; | |
36 | ||
37 | #ifdef LTTNG_EMBED_HELP | |
38 | static const char help_msg[] = | |
39 | #include <lttng-clear.1.h> | |
40 | ; | |
41 | #endif | |
42 | ||
43 | /* Mi writer */ | |
44 | static struct mi_writer *writer; | |
45 | ||
46 | enum { | |
47 | OPT_HELP = 1, | |
48 | OPT_LIST_OPTIONS, | |
49 | }; | |
50 | ||
51 | static struct poptOption long_options[] = { | |
52 | /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */ | |
53 | {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0}, | |
54 | {"all", 'a', POPT_ARG_VAL, &opt_clear_all, 1, 0, 0}, | |
55 | {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL}, | |
56 | {0, 0, 0, 0, 0, 0, 0} | |
57 | }; | |
58 | ||
59 | /* | |
60 | * clear session | |
61 | * | |
62 | */ | |
63 | static int clear_session(struct lttng_session *session) | |
64 | { | |
65 | int ret; | |
66 | char *session_name = NULL; | |
67 | ||
68 | ret = lttng_clear_session(session->name); | |
69 | if (ret < 0) { | |
70 | ERR("%s", lttng_strerror(ret)); | |
71 | goto error; | |
72 | } | |
73 | ||
74 | MSG("Session %s cleared", session->name); | |
75 | ||
76 | if (lttng_opt_mi) { | |
77 | ret = mi_lttng_session(writer, session, 0); | |
78 | if (ret) { | |
79 | ret = CMD_ERROR; | |
80 | goto error; | |
81 | } | |
82 | } | |
83 | ||
84 | ret = CMD_SUCCESS; | |
85 | error: | |
86 | free(session_name); | |
87 | return ret; | |
88 | } | |
89 | ||
90 | /* | |
91 | * clear all sessions | |
92 | * | |
93 | * Call clear_session for each registered sessions | |
94 | */ | |
95 | static int clear_all_sessions(struct lttng_session *sessions, int count) | |
96 | { | |
97 | int i, ret = CMD_SUCCESS; | |
98 | ||
99 | if (count == 0) { | |
100 | MSG("No session found, nothing to do."); | |
101 | } else if (count < 0) { | |
102 | ERR("%s", lttng_strerror(ret)); | |
103 | goto error; | |
104 | } | |
105 | ||
106 | for (i = 0; i < count; i++) { | |
107 | ret = clear_session(&sessions[i]); | |
108 | if (ret < 0) { | |
109 | goto error; | |
110 | } | |
111 | } | |
112 | error: | |
113 | return ret; | |
114 | } | |
115 | ||
116 | /* | |
117 | * The 'clear <options>' first level command | |
118 | */ | |
119 | int cmd_clear(int argc, const char **argv) | |
120 | { | |
121 | int opt; | |
122 | int ret = CMD_SUCCESS , i, command_ret = CMD_SUCCESS, success = 1; | |
123 | static poptContext pc; | |
124 | char *session_name = NULL; | |
125 | const char *leftover = NULL; | |
126 | ||
127 | struct lttng_session *sessions; | |
128 | int count; | |
129 | int found; | |
130 | ||
131 | pc = poptGetContext(NULL, argc, argv, long_options, 0); | |
132 | poptReadDefaultConfig(pc, 0); | |
133 | ||
134 | while ((opt = poptGetNextOpt(pc)) != -1) { | |
135 | switch (opt) { | |
136 | case OPT_HELP: | |
137 | SHOW_HELP(); | |
138 | break; | |
139 | case OPT_LIST_OPTIONS: | |
140 | list_cmd_options(stdout, long_options); | |
141 | break; | |
142 | default: | |
143 | ret = CMD_UNDEFINED; | |
144 | break; | |
145 | } | |
146 | goto end; | |
147 | } | |
148 | ||
149 | /* Mi preparation */ | |
150 | if (lttng_opt_mi) { | |
151 | writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi); | |
152 | if (!writer) { | |
153 | ret = -LTTNG_ERR_NOMEM; | |
154 | goto end; | |
155 | } | |
156 | ||
157 | /* Open command element */ | |
158 | ret = mi_lttng_writer_command_open(writer, | |
159 | mi_lttng_element_command_clear); | |
160 | if (ret) { | |
161 | ret = CMD_ERROR; | |
162 | goto end; | |
163 | } | |
164 | ||
165 | /* Open output element */ | |
166 | ret = mi_lttng_writer_open_element(writer, | |
167 | mi_lttng_element_command_output); | |
168 | if (ret) { | |
169 | ret = CMD_ERROR; | |
170 | goto end; | |
171 | } | |
172 | ||
173 | /* For validation and semantic purpose we open a sessions element */ | |
174 | ret = mi_lttng_sessions_open(writer); | |
175 | if (ret) { | |
176 | ret = CMD_ERROR; | |
177 | goto end; | |
178 | } | |
179 | } | |
180 | ||
181 | if (!opt_clear_all) { | |
182 | opt_session_name = (char *) poptGetArg(pc); | |
183 | ||
184 | if (!opt_session_name) { | |
185 | /* No session name specified, lookup default */ | |
186 | session_name = get_session_name(); | |
187 | if (session_name == NULL) { | |
188 | command_ret = CMD_ERROR; | |
189 | success = 0; | |
190 | goto mi_closing; | |
191 | } | |
192 | } else { | |
193 | session_name = opt_session_name; | |
194 | } | |
195 | } else { | |
196 | session_name = NULL; | |
197 | } | |
198 | ||
199 | leftover = poptGetArg(pc); | |
200 | if (leftover) { | |
201 | ERR("Unknown argument: %s", leftover); | |
202 | ret = CMD_ERROR; | |
203 | success = 0; | |
204 | goto mi_closing; | |
205 | } | |
206 | ||
207 | /* Recuperate all sessions for further operation */ | |
208 | count = lttng_list_sessions(&sessions); | |
209 | if (count < 0) { | |
210 | ERR("%s", lttng_strerror(count)); | |
211 | command_ret = CMD_ERROR; | |
212 | success = 0; | |
213 | goto mi_closing; | |
214 | } | |
215 | ||
216 | /* Ignore session name in case all sessions are to be cleaned */ | |
217 | if (opt_clear_all) { | |
218 | command_ret = clear_all_sessions(sessions, count); | |
219 | if (command_ret) { | |
220 | success = 0; | |
221 | } | |
222 | } else { | |
223 | /* Find the corresponding lttng_session struct */ | |
224 | found = 0; | |
225 | for (i = 0; i < count; i++) { | |
226 | if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) { | |
227 | found = 1; | |
228 | command_ret = clear_session(&sessions[i]); | |
229 | if (command_ret) { | |
230 | success = 0; | |
231 | } | |
232 | } | |
233 | } | |
234 | ||
235 | if (!found) { | |
236 | ERR("Session name %s not found", session_name); | |
237 | command_ret = LTTNG_ERR_SESS_NOT_FOUND; | |
238 | success = 0; | |
239 | goto mi_closing; | |
240 | } | |
241 | } | |
242 | ||
243 | ||
244 | mi_closing: | |
245 | /* Mi closing */ | |
246 | if (lttng_opt_mi) { | |
247 | /* Close sessions and output element element */ | |
248 | ret = mi_lttng_close_multi_element(writer, 2); | |
249 | if (ret) { | |
250 | ret = CMD_ERROR; | |
251 | goto end; | |
252 | } | |
253 | ||
254 | /* Success ? */ | |
255 | ret = mi_lttng_writer_write_element_bool(writer, | |
256 | mi_lttng_element_command_success, success); | |
257 | if (ret) { | |
258 | ret = CMD_ERROR; | |
259 | goto end; | |
260 | } | |
261 | ||
262 | /* Command element close */ | |
263 | ret = mi_lttng_writer_command_close(writer); | |
264 | if (ret) { | |
265 | ret = CMD_ERROR; | |
266 | goto end; | |
267 | } | |
268 | } | |
269 | end: | |
270 | /* Mi clean-up */ | |
271 | if (writer && mi_lttng_writer_destroy(writer)) { | |
272 | /* Preserve original error code */ | |
273 | ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL; | |
274 | } | |
275 | ||
276 | if (opt_session_name == NULL) { | |
277 | free(session_name); | |
278 | } | |
279 | ||
280 | /* Overwrite ret if an error occurred during clear_session/all */ | |
281 | ret = command_ret ? command_ret : ret; | |
282 | ||
283 | poptFreeContext(pc); | |
284 | return ret; | |
285 | } |