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 DG |
35 | |
36 | enum { | |
37 | OPT_HELP = 1, | |
679b4943 | 38 | OPT_LIST_OPTIONS, |
f3ed775e DG |
39 | }; |
40 | ||
41 | static struct poptOption long_options[] = { | |
42 | /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */ | |
43 | {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0}, | |
679b4943 | 44 | {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL}, |
f3ed775e DG |
45 | {0, 0, 0, 0, 0, 0, 0} |
46 | }; | |
47 | ||
1cfc0bc8 JRJ |
48 | static int mi_print_session(char *session_name, int enabled) |
49 | { | |
50 | int ret; | |
51 | ||
52 | /* Open session element */ | |
53 | ret = mi_lttng_writer_open_element(writer, config_element_session); | |
54 | if (ret) { | |
55 | goto end; | |
56 | } | |
57 | ||
58 | /* Print session name element */ | |
59 | ret = mi_lttng_writer_write_element_string(writer, config_element_name, | |
60 | session_name); | |
61 | if (ret) { | |
62 | goto end; | |
63 | } | |
64 | ||
65 | ret = mi_lttng_writer_write_element_bool(writer, config_element_enabled, | |
66 | enabled); | |
67 | if (ret) { | |
68 | goto end; | |
69 | } | |
70 | ||
71 | /* Close session element */ | |
72 | ret = mi_lttng_writer_close_element(writer); | |
73 | ||
74 | end: | |
75 | return ret; | |
76 | } | |
77 | ||
f3ed775e DG |
78 | /* |
79 | * start_tracing | |
80 | * | |
81 | * Start tracing for all trace of the session. | |
82 | */ | |
83 | static int start_tracing(void) | |
84 | { | |
ae856491 | 85 | int ret; |
f3ed775e DG |
86 | char *session_name; |
87 | ||
88 | if (opt_session_name == NULL) { | |
89 | session_name = get_session_name(); | |
90 | if (session_name == NULL) { | |
91 | ret = CMD_ERROR; | |
92 | goto error; | |
93 | } | |
94 | } else { | |
95 | session_name = opt_session_name; | |
96 | } | |
97 | ||
98 | DBG("Starting tracing for session %s", session_name); | |
99 | ||
6a4f824d | 100 | ret = lttng_start_tracing(session_name); |
f3ed775e | 101 | if (ret < 0) { |
42224349 | 102 | switch (-ret) { |
f73fabfd | 103 | case LTTNG_ERR_TRACE_ALREADY_STARTED: |
42224349 DG |
104 | WARN("Tracing already started for session %s", session_name); |
105 | break; | |
106 | default: | |
107 | ERR("%s", lttng_strerror(ret)); | |
108 | break; | |
109 | } | |
f3ed775e DG |
110 | goto free_name; |
111 | } | |
112 | ||
ae856491 DG |
113 | ret = CMD_SUCCESS; |
114 | ||
f3ed775e | 115 | MSG("Tracing started for session %s", session_name); |
1cfc0bc8 JRJ |
116 | if (lttng_opt_mi) { |
117 | ret = mi_print_session(session_name, 1); | |
118 | if (ret) { | |
119 | ret = CMD_ERROR; | |
120 | goto free_name; | |
121 | } | |
122 | } | |
f3ed775e DG |
123 | |
124 | free_name: | |
b73d0b29 MD |
125 | if (opt_session_name == NULL) { |
126 | free(session_name); | |
127 | } | |
f3ed775e DG |
128 | error: |
129 | return ret; | |
130 | } | |
131 | ||
132 | /* | |
133 | * cmd_start | |
134 | * | |
135 | * The 'start <options>' first level command | |
136 | */ | |
137 | int cmd_start(int argc, const char **argv) | |
138 | { | |
1cfc0bc8 | 139 | int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1; |
f3ed775e | 140 | static poptContext pc; |
266d3dd0 | 141 | const char *leftover = NULL; |
f3ed775e DG |
142 | |
143 | pc = poptGetContext(NULL, argc, argv, long_options, 0); | |
144 | poptReadDefaultConfig(pc, 0); | |
145 | ||
146 | while ((opt = poptGetNextOpt(pc)) != -1) { | |
147 | switch (opt) { | |
148 | case OPT_HELP: | |
4ba92f18 | 149 | SHOW_HELP(); |
f3ed775e | 150 | goto end; |
679b4943 SM |
151 | case OPT_LIST_OPTIONS: |
152 | list_cmd_options(stdout, long_options); | |
679b4943 | 153 | goto end; |
f3ed775e | 154 | default: |
f3ed775e DG |
155 | ret = CMD_UNDEFINED; |
156 | goto end; | |
157 | } | |
158 | } | |
159 | ||
160 | opt_session_name = (char*) poptGetArg(pc); | |
161 | ||
266d3dd0 JD |
162 | leftover = poptGetArg(pc); |
163 | if (leftover) { | |
164 | ERR("Unknown argument: %s", leftover); | |
165 | ret = CMD_ERROR; | |
166 | goto end; | |
167 | } | |
168 | ||
1cfc0bc8 JRJ |
169 | /* Mi check */ |
170 | if (lttng_opt_mi) { | |
171 | writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi); | |
172 | if (!writer) { | |
173 | ret = -LTTNG_ERR_NOMEM; | |
174 | goto end; | |
175 | } | |
176 | ||
177 | /* Open command element */ | |
178 | ret = mi_lttng_writer_command_open(writer, | |
179 | mi_lttng_element_command_start); | |
180 | if (ret) { | |
181 | ret = CMD_ERROR; | |
182 | goto end; | |
183 | } | |
184 | ||
185 | /* Open output element */ | |
186 | ret = mi_lttng_writer_open_element(writer, | |
187 | mi_lttng_element_command_output); | |
188 | if (ret) { | |
189 | ret = CMD_ERROR; | |
190 | goto end; | |
191 | } | |
192 | ||
193 | /* | |
194 | * Open sessions element | |
195 | * For validation purpose | |
196 | */ | |
197 | ret = mi_lttng_writer_open_element(writer, | |
198 | config_element_sessions); | |
199 | if (ret) { | |
200 | ret = CMD_ERROR; | |
201 | goto end; | |
202 | } | |
203 | } | |
204 | ||
205 | command_ret = start_tracing(); | |
206 | if (command_ret) { | |
207 | success = 0; | |
208 | } | |
209 | ||
210 | /* Mi closing */ | |
211 | if (lttng_opt_mi) { | |
212 | /* Close sessions and output element */ | |
213 | ret = mi_lttng_close_multi_element(writer, 2); | |
214 | if (ret) { | |
215 | ret = CMD_ERROR; | |
216 | goto end; | |
217 | } | |
218 | ||
219 | /* Success ? */ | |
220 | ret = mi_lttng_writer_write_element_bool(writer, | |
221 | mi_lttng_element_command_success, success); | |
222 | if (ret) { | |
223 | ret = CMD_ERROR; | |
224 | goto end; | |
225 | } | |
226 | ||
227 | /* Command element close */ | |
228 | ret = mi_lttng_writer_command_close(writer); | |
229 | if (ret) { | |
230 | ret = CMD_ERROR; | |
231 | goto end; | |
232 | } | |
233 | } | |
f3ed775e DG |
234 | |
235 | end: | |
1cfc0bc8 JRJ |
236 | /* Mi clean-up */ |
237 | if (writer && mi_lttng_writer_destroy(writer)) { | |
238 | /* Preserve original error code */ | |
239 | ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL; | |
240 | } | |
241 | ||
242 | /* Overwrite ret if an error occurred with start_tracing */ | |
243 | ret = command_ret ? command_ret : ret; | |
ca1c3607 | 244 | poptFreeContext(pc); |
f3ed775e DG |
245 | return ret; |
246 | } |