Commit | Line | Data |
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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 | ||
6c1c0768 | 18 | #define _LGPL_SOURCE |
f3ed775e DG |
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 | ||
1cfc0bc8 JRJ |
27 | #include <common/sessiond-comm/sessiond-comm.h> |
28 | #include <common/mi-lttng.h> | |
29 | ||
c399183f | 30 | #include "../command.h" |
f3ed775e | 31 | |
42224349 | 32 | |
f3ed775e | 33 | static char *opt_session_name; |
1cfc0bc8 | 34 | static struct mi_writer *writer; |
f3ed775e | 35 | |
4fc83d94 PP |
36 | #ifdef LTTNG_EMBED_HELP |
37 | static const char help_msg[] = | |
38 | #include <lttng-start.1.h> | |
39 | ; | |
40 | #endif | |
41 | ||
f3ed775e DG |
42 | enum { |
43 | OPT_HELP = 1, | |
679b4943 | 44 | OPT_LIST_OPTIONS, |
f3ed775e DG |
45 | }; |
46 | ||
47 | static struct poptOption long_options[] = { | |
48 | /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */ | |
49 | {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0}, | |
679b4943 | 50 | {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL}, |
f3ed775e DG |
51 | {0, 0, 0, 0, 0, 0, 0} |
52 | }; | |
53 | ||
1cfc0bc8 JRJ |
54 | static int mi_print_session(char *session_name, int enabled) |
55 | { | |
56 | int ret; | |
57 | ||
58 | /* Open session element */ | |
59 | ret = mi_lttng_writer_open_element(writer, config_element_session); | |
60 | if (ret) { | |
61 | goto end; | |
62 | } | |
63 | ||
64 | /* Print session name element */ | |
65 | ret = mi_lttng_writer_write_element_string(writer, config_element_name, | |
66 | session_name); | |
67 | if (ret) { | |
68 | goto end; | |
69 | } | |
70 | ||
71 | ret = mi_lttng_writer_write_element_bool(writer, config_element_enabled, | |
72 | enabled); | |
73 | if (ret) { | |
74 | goto end; | |
75 | } | |
76 | ||
77 | /* Close session element */ | |
78 | ret = mi_lttng_writer_close_element(writer); | |
79 | ||
80 | end: | |
81 | return ret; | |
82 | } | |
83 | ||
f3ed775e DG |
84 | /* |
85 | * start_tracing | |
86 | * | |
87 | * Start tracing for all trace of the session. | |
88 | */ | |
89 | static int start_tracing(void) | |
90 | { | |
ae856491 | 91 | int ret; |
f3ed775e DG |
92 | char *session_name; |
93 | ||
94 | if (opt_session_name == NULL) { | |
95 | session_name = get_session_name(); | |
96 | if (session_name == NULL) { | |
97 | ret = CMD_ERROR; | |
98 | goto error; | |
99 | } | |
100 | } else { | |
101 | session_name = opt_session_name; | |
102 | } | |
103 | ||
104 | DBG("Starting tracing for session %s", session_name); | |
105 | ||
6a4f824d | 106 | ret = lttng_start_tracing(session_name); |
f3ed775e | 107 | if (ret < 0) { |
42224349 | 108 | switch (-ret) { |
f73fabfd | 109 | case LTTNG_ERR_TRACE_ALREADY_STARTED: |
42224349 DG |
110 | WARN("Tracing already started for session %s", session_name); |
111 | break; | |
112 | default: | |
113 | ERR("%s", lttng_strerror(ret)); | |
114 | break; | |
115 | } | |
f3ed775e DG |
116 | goto free_name; |
117 | } | |
118 | ||
ae856491 DG |
119 | ret = CMD_SUCCESS; |
120 | ||
f3ed775e | 121 | MSG("Tracing started for session %s", session_name); |
1cfc0bc8 JRJ |
122 | if (lttng_opt_mi) { |
123 | ret = mi_print_session(session_name, 1); | |
124 | if (ret) { | |
125 | ret = CMD_ERROR; | |
126 | goto free_name; | |
127 | } | |
128 | } | |
f3ed775e DG |
129 | |
130 | free_name: | |
b73d0b29 MD |
131 | if (opt_session_name == NULL) { |
132 | free(session_name); | |
133 | } | |
f3ed775e DG |
134 | error: |
135 | return ret; | |
136 | } | |
137 | ||
138 | /* | |
139 | * cmd_start | |
140 | * | |
141 | * The 'start <options>' first level command | |
142 | */ | |
143 | int cmd_start(int argc, const char **argv) | |
144 | { | |
1cfc0bc8 | 145 | int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1; |
f3ed775e | 146 | static poptContext pc; |
68c7f6e5 | 147 | const char *leftover = NULL; |
f3ed775e DG |
148 | |
149 | pc = poptGetContext(NULL, argc, argv, long_options, 0); | |
150 | poptReadDefaultConfig(pc, 0); | |
151 | ||
152 | while ((opt = poptGetNextOpt(pc)) != -1) { | |
153 | switch (opt) { | |
154 | case OPT_HELP: | |
4ba92f18 | 155 | SHOW_HELP(); |
f3ed775e | 156 | goto end; |
679b4943 SM |
157 | case OPT_LIST_OPTIONS: |
158 | list_cmd_options(stdout, long_options); | |
679b4943 | 159 | goto end; |
f3ed775e | 160 | default: |
f3ed775e DG |
161 | ret = CMD_UNDEFINED; |
162 | goto end; | |
163 | } | |
164 | } | |
165 | ||
166 | opt_session_name = (char*) poptGetArg(pc); | |
167 | ||
68c7f6e5 JD |
168 | leftover = poptGetArg(pc); |
169 | if (leftover) { | |
170 | ERR("Unknown argument: %s", leftover); | |
171 | ret = CMD_ERROR; | |
172 | goto end; | |
173 | } | |
174 | ||
1cfc0bc8 JRJ |
175 | /* Mi check */ |
176 | if (lttng_opt_mi) { | |
177 | writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi); | |
178 | if (!writer) { | |
179 | ret = -LTTNG_ERR_NOMEM; | |
180 | goto end; | |
181 | } | |
182 | ||
183 | /* Open command element */ | |
184 | ret = mi_lttng_writer_command_open(writer, | |
185 | mi_lttng_element_command_start); | |
186 | if (ret) { | |
187 | ret = CMD_ERROR; | |
188 | goto end; | |
189 | } | |
190 | ||
191 | /* Open output element */ | |
192 | ret = mi_lttng_writer_open_element(writer, | |
193 | mi_lttng_element_command_output); | |
194 | if (ret) { | |
195 | ret = CMD_ERROR; | |
196 | goto end; | |
197 | } | |
198 | ||
199 | /* | |
200 | * Open sessions element | |
201 | * For validation purpose | |
202 | */ | |
203 | ret = mi_lttng_writer_open_element(writer, | |
204 | config_element_sessions); | |
205 | if (ret) { | |
206 | ret = CMD_ERROR; | |
207 | goto end; | |
208 | } | |
209 | } | |
210 | ||
211 | command_ret = start_tracing(); | |
212 | if (command_ret) { | |
213 | success = 0; | |
214 | } | |
215 | ||
216 | /* Mi closing */ | |
217 | if (lttng_opt_mi) { | |
218 | /* Close sessions and output element */ | |
219 | ret = mi_lttng_close_multi_element(writer, 2); | |
220 | if (ret) { | |
221 | ret = CMD_ERROR; | |
222 | goto end; | |
223 | } | |
224 | ||
225 | /* Success ? */ | |
226 | ret = mi_lttng_writer_write_element_bool(writer, | |
227 | mi_lttng_element_command_success, success); | |
228 | if (ret) { | |
229 | ret = CMD_ERROR; | |
230 | goto end; | |
231 | } | |
232 | ||
233 | /* Command element close */ | |
234 | ret = mi_lttng_writer_command_close(writer); | |
235 | if (ret) { | |
236 | ret = CMD_ERROR; | |
237 | goto end; | |
238 | } | |
239 | } | |
f3ed775e DG |
240 | |
241 | end: | |
1cfc0bc8 JRJ |
242 | /* Mi clean-up */ |
243 | if (writer && mi_lttng_writer_destroy(writer)) { | |
244 | /* Preserve original error code */ | |
245 | ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL; | |
246 | } | |
247 | ||
248 | /* Overwrite ret if an error occurred with start_tracing */ | |
249 | ret = command_ret ? command_ret : ret; | |
ca1c3607 | 250 | poptFreeContext(pc); |
f3ed775e DG |
251 | return ret; |
252 | } |