Clean-up: lttng: fix -Wshadow error in cmd_snapshot
[lttng-tools.git] / src / bin / lttng / commands / start.c
1 /*
2 * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
3 *
4 * SPDX-License-Identifier: GPL-2.0-only
5 *
6 */
7
8 #define _LGPL_SOURCE
9 #include <popt.h>
10 #include <stdio.h>
11 #include <stdlib.h>
12 #include <string.h>
13 #include <sys/stat.h>
14 #include <sys/types.h>
15 #include <unistd.h>
16
17 #include <common/sessiond-comm/sessiond-comm.h>
18 #include <common/mi-lttng.h>
19
20 #include "../command.h"
21
22
23 static char *opt_session_name;
24 static struct mi_writer *writer;
25
26 #ifdef LTTNG_EMBED_HELP
27 static const char help_msg[] =
28 #include <lttng-start.1.h>
29 ;
30 #endif
31
32 enum {
33 OPT_HELP = 1,
34 OPT_LIST_OPTIONS,
35 };
36
37 static struct poptOption long_options[] = {
38 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
39 {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
40 {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
41 {0, 0, 0, 0, 0, 0, 0}
42 };
43
44 static int mi_print_session(char *session_name, int enabled)
45 {
46 int ret;
47
48 /* Open session element */
49 ret = mi_lttng_writer_open_element(writer, config_element_session);
50 if (ret) {
51 goto end;
52 }
53
54 /* Print session name element */
55 ret = mi_lttng_writer_write_element_string(writer, config_element_name,
56 session_name);
57 if (ret) {
58 goto end;
59 }
60
61 ret = mi_lttng_writer_write_element_bool(writer, config_element_enabled,
62 enabled);
63 if (ret) {
64 goto end;
65 }
66
67 /* Close session element */
68 ret = mi_lttng_writer_close_element(writer);
69
70 end:
71 return ret;
72 }
73
74 /*
75 * start_tracing
76 *
77 * Start tracing for all trace of the session.
78 */
79 static int start_tracing(void)
80 {
81 int ret;
82 char *session_name;
83
84 if (opt_session_name == NULL) {
85 session_name = get_session_name();
86 if (session_name == NULL) {
87 ret = CMD_ERROR;
88 goto error;
89 }
90 } else {
91 session_name = opt_session_name;
92 }
93
94 DBG("Starting tracing for session %s", session_name);
95
96 ret = lttng_start_tracing(session_name);
97 if (ret < 0) {
98 switch (-ret) {
99 case LTTNG_ERR_TRACE_ALREADY_STARTED:
100 WARN("Tracing already started for session %s", session_name);
101 break;
102 default:
103 ERR("%s", lttng_strerror(ret));
104 break;
105 }
106 goto free_name;
107 }
108
109 ret = CMD_SUCCESS;
110
111 MSG("Tracing started for session %s", session_name);
112 if (lttng_opt_mi) {
113 ret = mi_print_session(session_name, 1);
114 if (ret) {
115 ret = CMD_ERROR;
116 goto free_name;
117 }
118 }
119
120 free_name:
121 if (opt_session_name == NULL) {
122 free(session_name);
123 }
124 error:
125 return ret;
126 }
127
128 /*
129 * cmd_start
130 *
131 * The 'start <options>' first level command
132 */
133 int cmd_start(int argc, const char **argv)
134 {
135 int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1;
136 static poptContext pc;
137 const char *leftover = NULL;
138
139 pc = poptGetContext(NULL, argc, argv, long_options, 0);
140 poptReadDefaultConfig(pc, 0);
141
142 while ((opt = poptGetNextOpt(pc)) != -1) {
143 switch (opt) {
144 case OPT_HELP:
145 SHOW_HELP();
146 goto end;
147 case OPT_LIST_OPTIONS:
148 list_cmd_options(stdout, long_options);
149 goto end;
150 default:
151 ret = CMD_UNDEFINED;
152 goto end;
153 }
154 }
155
156 opt_session_name = (char*) poptGetArg(pc);
157
158 leftover = poptGetArg(pc);
159 if (leftover) {
160 ERR("Unknown argument: %s", leftover);
161 ret = CMD_ERROR;
162 goto end;
163 }
164
165 /* Mi check */
166 if (lttng_opt_mi) {
167 writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
168 if (!writer) {
169 ret = -LTTNG_ERR_NOMEM;
170 goto end;
171 }
172
173 /* Open command element */
174 ret = mi_lttng_writer_command_open(writer,
175 mi_lttng_element_command_start);
176 if (ret) {
177 ret = CMD_ERROR;
178 goto end;
179 }
180
181 /* Open output element */
182 ret = mi_lttng_writer_open_element(writer,
183 mi_lttng_element_command_output);
184 if (ret) {
185 ret = CMD_ERROR;
186 goto end;
187 }
188
189 /*
190 * Open sessions element
191 * For validation purpose
192 */
193 ret = mi_lttng_writer_open_element(writer,
194 config_element_sessions);
195 if (ret) {
196 ret = CMD_ERROR;
197 goto end;
198 }
199 }
200
201 command_ret = start_tracing();
202 if (command_ret) {
203 success = 0;
204 }
205
206 /* Mi closing */
207 if (lttng_opt_mi) {
208 /* Close sessions and output element */
209 ret = mi_lttng_close_multi_element(writer, 2);
210 if (ret) {
211 ret = CMD_ERROR;
212 goto end;
213 }
214
215 /* Success ? */
216 ret = mi_lttng_writer_write_element_bool(writer,
217 mi_lttng_element_command_success, success);
218 if (ret) {
219 ret = CMD_ERROR;
220 goto end;
221 }
222
223 /* Command element close */
224 ret = mi_lttng_writer_command_close(writer);
225 if (ret) {
226 ret = CMD_ERROR;
227 goto end;
228 }
229 }
230
231 end:
232 /* Mi clean-up */
233 if (writer && mi_lttng_writer_destroy(writer)) {
234 /* Preserve original error code */
235 ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL;
236 }
237
238 /* Overwrite ret if an error occurred with start_tracing */
239 ret = command_ret ? command_ret : ret;
240 poptFreeContext(pc);
241 return ret;
242 }
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