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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> | |
e5b83100 | 26 | #include <assert.h> |
f3ed775e | 27 | |
42224349 | 28 | #include <common/sessiond-comm/sessiond-comm.h> |
e5b83100 JRJ |
29 | #include <common/mi-lttng.h> |
30 | ||
31 | #include "../command.h" | |
42224349 | 32 | |
f3ed775e | 33 | static char *opt_session_name; |
38ee087f | 34 | static int opt_no_wait; |
e5b83100 | 35 | static struct mi_writer *writer; |
f3ed775e DG |
36 | |
37 | enum { | |
38 | OPT_HELP = 1, | |
679b4943 | 39 | OPT_LIST_OPTIONS, |
f3ed775e DG |
40 | }; |
41 | ||
42 | static struct poptOption long_options[] = { | |
43 | /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */ | |
44 | {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0}, | |
679b4943 | 45 | {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL}, |
38ee087f | 46 | {"no-wait", 'n', POPT_ARG_VAL, &opt_no_wait, 1, 0, 0}, |
f3ed775e DG |
47 | {0, 0, 0, 0, 0, 0, 0} |
48 | }; | |
49 | ||
50 | /* | |
51 | * usage | |
52 | */ | |
53 | static void usage(FILE *ofp) | |
54 | { | |
32a6298d | 55 | fprintf(ofp, "usage: lttng stop [NAME] [OPTIONS]\n"); |
f3ed775e DG |
56 | fprintf(ofp, "\n"); |
57 | fprintf(ofp, "Where NAME is an optional session name. If not specified, lttng will\n"); | |
58 | fprintf(ofp, "get it from the configuration directory (.lttng).\n"); | |
59 | fprintf(ofp, "\n"); | |
32a6298d | 60 | fprintf(ofp, "Options:\n"); |
f3ed775e | 61 | fprintf(ofp, " -h, --help Show this help\n"); |
679b4943 | 62 | fprintf(ofp, " --list-options Simple listing of options\n"); |
38ee087f | 63 | fprintf(ofp, " -n, --no-wait Don't wait for data availability\n"); |
f3ed775e DG |
64 | fprintf(ofp, "\n"); |
65 | } | |
e5b83100 JRJ |
66 | /* |
67 | * Mi print of partial session | |
68 | */ | |
69 | static int mi_print_session(char *session_name, int enabled) | |
70 | { | |
71 | int ret; | |
72 | assert(writer); | |
73 | assert(session_name); | |
74 | ||
75 | /* Open session element */ | |
76 | ret = mi_lttng_writer_open_element(writer, config_element_session); | |
77 | if (ret) { | |
78 | goto end; | |
79 | } | |
80 | ||
81 | /* Print session name element */ | |
82 | ret = mi_lttng_writer_write_element_string(writer, config_element_name, | |
83 | session_name); | |
84 | if (ret) { | |
85 | goto end; | |
86 | } | |
87 | ||
88 | /* Is enabled ? */ | |
89 | ret = mi_lttng_writer_write_element_bool(writer, config_element_enabled, | |
90 | enabled); | |
91 | if (ret) { | |
92 | goto end; | |
93 | } | |
94 | ||
95 | /* Close session element */ | |
96 | ret = mi_lttng_writer_close_element(writer); | |
97 | ||
98 | end: | |
99 | return ret; | |
100 | } | |
f3ed775e DG |
101 | |
102 | /* | |
cd80958d | 103 | * Start tracing for all trace of the session. |
f3ed775e DG |
104 | */ |
105 | static int stop_tracing(void) | |
106 | { | |
ae856491 | 107 | int ret; |
f3ed775e DG |
108 | char *session_name; |
109 | ||
110 | if (opt_session_name == NULL) { | |
111 | session_name = get_session_name(); | |
112 | if (session_name == NULL) { | |
113 | ret = CMD_ERROR; | |
114 | goto error; | |
115 | } | |
116 | } else { | |
117 | session_name = opt_session_name; | |
118 | } | |
119 | ||
8eb7a5e2 | 120 | ret = lttng_stop_tracing_no_wait(session_name); |
f3ed775e | 121 | if (ret < 0) { |
42224349 | 122 | switch (-ret) { |
f73fabfd | 123 | case LTTNG_ERR_TRACE_ALREADY_STOPPED: |
42224349 DG |
124 | WARN("Tracing already stopped for session %s", session_name); |
125 | break; | |
126 | default: | |
127 | ERR("%s", lttng_strerror(ret)); | |
128 | break; | |
129 | } | |
f3ed775e DG |
130 | goto free_name; |
131 | } | |
132 | ||
8eb7a5e2 JG |
133 | if (!opt_no_wait) { |
134 | _MSG("Waiting for data availability"); | |
135 | fflush(stdout); | |
136 | do { | |
137 | ret = lttng_data_pending(session_name); | |
138 | if (ret < 0) { | |
139 | /* Return the data available call error. */ | |
e5b83100 | 140 | goto free_name; |
8eb7a5e2 JG |
141 | } |
142 | ||
143 | /* | |
144 | * Data sleep time before retrying (in usec). Don't sleep if the call | |
145 | * returned value indicates availability. | |
146 | */ | |
147 | if (ret) { | |
148 | usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME); | |
149 | _MSG("."); | |
150 | fflush(stdout); | |
151 | } | |
152 | } while (ret != 0); | |
153 | MSG(""); | |
154 | } | |
155 | ||
ae856491 DG |
156 | ret = CMD_SUCCESS; |
157 | ||
f3ed775e | 158 | MSG("Tracing stopped for session %s", session_name); |
e5b83100 JRJ |
159 | if (lttng_opt_mi) { |
160 | ret = mi_print_session(session_name, 0); | |
161 | if (ret) { | |
162 | goto free_name; | |
163 | } | |
164 | } | |
f3ed775e DG |
165 | |
166 | free_name: | |
b73d0b29 MD |
167 | if (opt_session_name == NULL) { |
168 | free(session_name); | |
169 | } | |
cd80958d | 170 | |
f3ed775e DG |
171 | error: |
172 | return ret; | |
173 | } | |
174 | ||
175 | /* | |
176 | * cmd_stop | |
177 | * | |
178 | * The 'stop <options>' first level command | |
179 | */ | |
180 | int cmd_stop(int argc, const char **argv) | |
181 | { | |
e5b83100 | 182 | int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1; |
f3ed775e DG |
183 | static poptContext pc; |
184 | ||
185 | pc = poptGetContext(NULL, argc, argv, long_options, 0); | |
186 | poptReadDefaultConfig(pc, 0); | |
187 | ||
188 | while ((opt = poptGetNextOpt(pc)) != -1) { | |
189 | switch (opt) { | |
190 | case OPT_HELP: | |
ca1c3607 | 191 | usage(stdout); |
f3ed775e | 192 | goto end; |
679b4943 SM |
193 | case OPT_LIST_OPTIONS: |
194 | list_cmd_options(stdout, long_options); | |
679b4943 | 195 | goto end; |
f3ed775e DG |
196 | default: |
197 | usage(stderr); | |
198 | ret = CMD_UNDEFINED; | |
199 | goto end; | |
200 | } | |
201 | } | |
202 | ||
e5b83100 JRJ |
203 | /* Mi check */ |
204 | if (lttng_opt_mi) { | |
205 | writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi); | |
206 | if (!writer) { | |
207 | ret = -LTTNG_ERR_NOMEM; | |
208 | goto end; | |
209 | } | |
210 | ||
211 | /* Open command element */ | |
212 | ret = mi_lttng_writer_command_open(writer, | |
213 | mi_lttng_element_command_stop); | |
214 | if (ret) { | |
215 | ret = CMD_ERROR; | |
216 | goto end; | |
217 | } | |
218 | ||
219 | /* Open output element */ | |
220 | ret = mi_lttng_writer_open_element(writer, | |
221 | mi_lttng_element_command_output); | |
222 | if (ret) { | |
223 | ret = CMD_ERROR; | |
224 | goto end; | |
225 | } | |
226 | ||
227 | /* | |
228 | * Open sessions element | |
229 | * For validation | |
230 | */ | |
231 | ret = mi_lttng_writer_open_element(writer, | |
232 | config_element_sessions); | |
233 | if (ret) { | |
234 | ret = CMD_ERROR; | |
235 | goto end; | |
236 | } | |
237 | } | |
238 | ||
f3ed775e DG |
239 | opt_session_name = (char*) poptGetArg(pc); |
240 | ||
e5b83100 JRJ |
241 | command_ret = stop_tracing(); |
242 | if (command_ret) { | |
243 | success = 0; | |
244 | } | |
245 | ||
246 | /* Mi closing */ | |
247 | if (lttng_opt_mi) { | |
248 | /* Close sessions and output element */ | |
249 | ret = mi_lttng_close_multi_element(writer, 2); | |
250 | if (ret) { | |
251 | ret = CMD_ERROR; | |
252 | goto end; | |
253 | } | |
254 | ||
255 | /* Success ? */ | |
256 | ret = mi_lttng_writer_write_element_bool(writer, | |
257 | mi_lttng_element_command_success, success); | |
258 | if (ret) { | |
259 | ret = CMD_ERROR; | |
260 | goto end; | |
261 | } | |
262 | ||
263 | /* Command element close */ | |
264 | ret = mi_lttng_writer_command_close(writer); | |
265 | if (ret) { | |
266 | ret = CMD_ERROR; | |
267 | goto end; | |
268 | } | |
269 | } | |
f3ed775e DG |
270 | |
271 | end: | |
e5b83100 JRJ |
272 | /* Mi clean-up */ |
273 | if (writer && mi_lttng_writer_destroy(writer)) { | |
274 | /* Preserve original error code */ | |
275 | ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL; | |
276 | } | |
277 | ||
278 | /* Overwrite ret if an error occurred in stop_tracing() */ | |
279 | ret = command_ret ? command_ret : ret; | |
280 | ||
ca1c3607 | 281 | poptFreeContext(pc); |
f3ed775e DG |
282 | return ret; |
283 | } |