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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 | |
6c1c0768 | 19 | #define _LGPL_SOURCE |
f3ed775e DG |
20 | #include <popt.h> |
21 | #include <stdio.h> | |
22 | #include <stdlib.h> | |
23 | #include <string.h> | |
24 | #include <sys/stat.h> | |
25 | #include <sys/types.h> | |
26 | #include <unistd.h> | |
27 | ||
1cfc0bc8 JRJ |
28 | #include <common/sessiond-comm/sessiond-comm.h> |
29 | #include <common/mi-lttng.h> | |
30 | ||
c399183f | 31 | #include "../command.h" |
f3ed775e | 32 | |
42224349 | 33 | |
f3ed775e | 34 | static char *opt_session_name; |
1cfc0bc8 | 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}, |
f3ed775e DG |
46 | {0, 0, 0, 0, 0, 0, 0} |
47 | }; | |
48 | ||
49 | /* | |
50 | * usage | |
51 | */ | |
52 | static void usage(FILE *ofp) | |
53 | { | |
32a6298d | 54 | fprintf(ofp, "usage: lttng start [NAME] [OPTIONS]\n"); |
f3ed775e DG |
55 | fprintf(ofp, "\n"); |
56 | fprintf(ofp, "Where NAME is an optional session name. If not specified, lttng will\n"); | |
57 | fprintf(ofp, "get it from the configuration directory (.lttng).\n"); | |
58 | fprintf(ofp, "\n"); | |
32a6298d | 59 | fprintf(ofp, "Options:\n"); |
f3ed775e | 60 | fprintf(ofp, " -h, --help Show this help\n"); |
679b4943 | 61 | fprintf(ofp, " --list-options Simple listing of options\n"); |
f3ed775e DG |
62 | fprintf(ofp, "\n"); |
63 | } | |
64 | ||
1cfc0bc8 JRJ |
65 | static int mi_print_session(char *session_name, int enabled) |
66 | { | |
67 | int ret; | |
68 | ||
69 | /* Open session element */ | |
70 | ret = mi_lttng_writer_open_element(writer, config_element_session); | |
71 | if (ret) { | |
72 | goto end; | |
73 | } | |
74 | ||
75 | /* Print session name element */ | |
76 | ret = mi_lttng_writer_write_element_string(writer, config_element_name, | |
77 | session_name); | |
78 | if (ret) { | |
79 | goto end; | |
80 | } | |
81 | ||
82 | ret = mi_lttng_writer_write_element_bool(writer, config_element_enabled, | |
83 | enabled); | |
84 | if (ret) { | |
85 | goto end; | |
86 | } | |
87 | ||
88 | /* Close session element */ | |
89 | ret = mi_lttng_writer_close_element(writer); | |
90 | ||
91 | end: | |
92 | return ret; | |
93 | } | |
94 | ||
f3ed775e DG |
95 | /* |
96 | * start_tracing | |
97 | * | |
98 | * Start tracing for all trace of the session. | |
99 | */ | |
100 | static int start_tracing(void) | |
101 | { | |
ae856491 | 102 | int ret; |
f3ed775e DG |
103 | char *session_name; |
104 | ||
105 | if (opt_session_name == NULL) { | |
106 | session_name = get_session_name(); | |
107 | if (session_name == NULL) { | |
108 | ret = CMD_ERROR; | |
109 | goto error; | |
110 | } | |
111 | } else { | |
112 | session_name = opt_session_name; | |
113 | } | |
114 | ||
115 | DBG("Starting tracing for session %s", session_name); | |
116 | ||
6a4f824d | 117 | ret = lttng_start_tracing(session_name); |
f3ed775e | 118 | if (ret < 0) { |
42224349 | 119 | switch (-ret) { |
f73fabfd | 120 | case LTTNG_ERR_TRACE_ALREADY_STARTED: |
42224349 DG |
121 | WARN("Tracing already started for session %s", session_name); |
122 | break; | |
123 | default: | |
124 | ERR("%s", lttng_strerror(ret)); | |
125 | break; | |
126 | } | |
f3ed775e DG |
127 | goto free_name; |
128 | } | |
129 | ||
ae856491 DG |
130 | ret = CMD_SUCCESS; |
131 | ||
f3ed775e | 132 | MSG("Tracing started for session %s", session_name); |
1cfc0bc8 JRJ |
133 | if (lttng_opt_mi) { |
134 | ret = mi_print_session(session_name, 1); | |
135 | if (ret) { | |
136 | ret = CMD_ERROR; | |
137 | goto free_name; | |
138 | } | |
139 | } | |
f3ed775e DG |
140 | |
141 | free_name: | |
b73d0b29 MD |
142 | if (opt_session_name == NULL) { |
143 | free(session_name); | |
144 | } | |
f3ed775e DG |
145 | error: |
146 | return ret; | |
147 | } | |
148 | ||
149 | /* | |
150 | * cmd_start | |
151 | * | |
152 | * The 'start <options>' first level command | |
153 | */ | |
154 | int cmd_start(int argc, const char **argv) | |
155 | { | |
1cfc0bc8 | 156 | int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1; |
f3ed775e DG |
157 | static poptContext pc; |
158 | ||
159 | pc = poptGetContext(NULL, argc, argv, long_options, 0); | |
160 | poptReadDefaultConfig(pc, 0); | |
161 | ||
162 | while ((opt = poptGetNextOpt(pc)) != -1) { | |
163 | switch (opt) { | |
164 | case OPT_HELP: | |
ca1c3607 | 165 | usage(stdout); |
f3ed775e | 166 | goto end; |
679b4943 SM |
167 | case OPT_LIST_OPTIONS: |
168 | list_cmd_options(stdout, long_options); | |
679b4943 | 169 | goto end; |
f3ed775e DG |
170 | default: |
171 | usage(stderr); | |
172 | ret = CMD_UNDEFINED; | |
173 | goto end; | |
174 | } | |
175 | } | |
176 | ||
177 | opt_session_name = (char*) poptGetArg(pc); | |
178 | ||
1cfc0bc8 JRJ |
179 | /* Mi check */ |
180 | if (lttng_opt_mi) { | |
181 | writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi); | |
182 | if (!writer) { | |
183 | ret = -LTTNG_ERR_NOMEM; | |
184 | goto end; | |
185 | } | |
186 | ||
187 | /* Open command element */ | |
188 | ret = mi_lttng_writer_command_open(writer, | |
189 | mi_lttng_element_command_start); | |
190 | if (ret) { | |
191 | ret = CMD_ERROR; | |
192 | goto end; | |
193 | } | |
194 | ||
195 | /* Open output element */ | |
196 | ret = mi_lttng_writer_open_element(writer, | |
197 | mi_lttng_element_command_output); | |
198 | if (ret) { | |
199 | ret = CMD_ERROR; | |
200 | goto end; | |
201 | } | |
202 | ||
203 | /* | |
204 | * Open sessions element | |
205 | * For validation purpose | |
206 | */ | |
207 | ret = mi_lttng_writer_open_element(writer, | |
208 | config_element_sessions); | |
209 | if (ret) { | |
210 | ret = CMD_ERROR; | |
211 | goto end; | |
212 | } | |
213 | } | |
214 | ||
215 | command_ret = start_tracing(); | |
216 | if (command_ret) { | |
217 | success = 0; | |
218 | } | |
219 | ||
220 | /* Mi closing */ | |
221 | if (lttng_opt_mi) { | |
222 | /* Close sessions and output element */ | |
223 | ret = mi_lttng_close_multi_element(writer, 2); | |
224 | if (ret) { | |
225 | ret = CMD_ERROR; | |
226 | goto end; | |
227 | } | |
228 | ||
229 | /* Success ? */ | |
230 | ret = mi_lttng_writer_write_element_bool(writer, | |
231 | mi_lttng_element_command_success, success); | |
232 | if (ret) { | |
233 | ret = CMD_ERROR; | |
234 | goto end; | |
235 | } | |
236 | ||
237 | /* Command element close */ | |
238 | ret = mi_lttng_writer_command_close(writer); | |
239 | if (ret) { | |
240 | ret = CMD_ERROR; | |
241 | goto end; | |
242 | } | |
243 | } | |
f3ed775e DG |
244 | |
245 | end: | |
1cfc0bc8 JRJ |
246 | /* Mi clean-up */ |
247 | if (writer && mi_lttng_writer_destroy(writer)) { | |
248 | /* Preserve original error code */ | |
249 | ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL; | |
250 | } | |
251 | ||
252 | /* Overwrite ret if an error occurred with start_tracing */ | |
253 | ret = command_ret ? command_ret : ret; | |
ca1c3607 | 254 | poptFreeContext(pc); |
f3ed775e DG |
255 | return ret; |
256 | } |