Commit | Line | Data |
---|---|---|
f3ed775e | 1 | /* |
21cf9b6b | 2 | * Copyright (C) 2011 EfficiOS Inc. |
f3ed775e | 3 | * |
ab5be9fa | 4 | * SPDX-License-Identifier: GPL-2.0-only |
f3ed775e | 5 | * |
f3ed775e DG |
6 | */ |
7 | ||
6c1c0768 | 8 | #define _LGPL_SOURCE |
f3ed775e DG |
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 | ||
c9e313bc SM |
17 | #include <common/sessiond-comm/sessiond-comm.hpp> |
18 | #include <common/mi-lttng.hpp> | |
1cfc0bc8 | 19 | |
c9e313bc | 20 | #include "../command.hpp" |
f3ed775e | 21 | |
42224349 | 22 | |
1cfc0bc8 | 23 | static struct mi_writer *writer; |
f3ed775e | 24 | |
4fc83d94 PP |
25 | #ifdef LTTNG_EMBED_HELP |
26 | static const char help_msg[] = | |
27 | #include <lttng-start.1.h> | |
28 | ; | |
29 | #endif | |
30 | ||
f3ed775e DG |
31 | enum { |
32 | OPT_HELP = 1, | |
679b4943 | 33 | OPT_LIST_OPTIONS, |
f3ed775e DG |
34 | }; |
35 | ||
36 | static struct poptOption long_options[] = { | |
37 | /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */ | |
38 | {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0}, | |
679b4943 | 39 | {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL}, |
f3ed775e DG |
40 | {0, 0, 0, 0, 0, 0, 0} |
41 | }; | |
42 | ||
1cfc0bc8 JRJ |
43 | static int mi_print_session(char *session_name, int enabled) |
44 | { | |
45 | int ret; | |
46 | ||
47 | /* Open session element */ | |
48 | ret = mi_lttng_writer_open_element(writer, config_element_session); | |
49 | if (ret) { | |
50 | goto end; | |
51 | } | |
52 | ||
53 | /* Print session name element */ | |
54 | ret = mi_lttng_writer_write_element_string(writer, config_element_name, | |
55 | session_name); | |
56 | if (ret) { | |
57 | goto end; | |
58 | } | |
59 | ||
60 | ret = mi_lttng_writer_write_element_bool(writer, config_element_enabled, | |
61 | enabled); | |
62 | if (ret) { | |
63 | goto end; | |
64 | } | |
65 | ||
66 | /* Close session element */ | |
67 | ret = mi_lttng_writer_close_element(writer); | |
68 | ||
69 | end: | |
70 | return ret; | |
71 | } | |
72 | ||
f3ed775e DG |
73 | /* |
74 | * start_tracing | |
75 | * | |
76 | * Start tracing for all trace of the session. | |
77 | */ | |
5b915816 | 78 | static int start_tracing(const char *arg_session_name) |
f3ed775e | 79 | { |
ae856491 | 80 | int ret; |
f3ed775e DG |
81 | char *session_name; |
82 | ||
5b915816 | 83 | if (arg_session_name == NULL) { |
f3ed775e | 84 | session_name = get_session_name(); |
5b915816 MJ |
85 | } else { |
86 | session_name = strdup(arg_session_name); | |
f3ed775e | 87 | if (session_name == NULL) { |
5b915816 | 88 | PERROR("Failed to copy session name"); |
f3ed775e | 89 | } |
5b915816 MJ |
90 | } |
91 | ||
92 | if (session_name == NULL) { | |
93 | ret = CMD_ERROR; | |
94 | goto error; | |
f3ed775e DG |
95 | } |
96 | ||
97 | DBG("Starting tracing for session %s", session_name); | |
98 | ||
6a4f824d | 99 | ret = lttng_start_tracing(session_name); |
f3ed775e | 100 | if (ret < 0) { |
42224349 | 101 | switch (-ret) { |
f73fabfd | 102 | case LTTNG_ERR_TRACE_ALREADY_STARTED: |
42224349 DG |
103 | WARN("Tracing already started for session %s", session_name); |
104 | break; | |
105 | default: | |
106 | ERR("%s", lttng_strerror(ret)); | |
107 | break; | |
108 | } | |
f3ed775e DG |
109 | goto free_name; |
110 | } | |
111 | ||
ae856491 DG |
112 | ret = CMD_SUCCESS; |
113 | ||
f3ed775e | 114 | MSG("Tracing started for session %s", session_name); |
1cfc0bc8 JRJ |
115 | if (lttng_opt_mi) { |
116 | ret = mi_print_session(session_name, 1); | |
117 | if (ret) { | |
118 | ret = CMD_ERROR; | |
119 | goto free_name; | |
120 | } | |
121 | } | |
f3ed775e DG |
122 | |
123 | free_name: | |
5b915816 | 124 | free(session_name); |
f3ed775e DG |
125 | error: |
126 | return ret; | |
127 | } | |
128 | ||
129 | /* | |
130 | * cmd_start | |
131 | * | |
132 | * The 'start <options>' first level command | |
133 | */ | |
134 | int cmd_start(int argc, const char **argv) | |
135 | { | |
1cfc0bc8 | 136 | int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1; |
f3ed775e | 137 | static poptContext pc; |
5b915816 | 138 | const char *arg_session_name = NULL; |
68c7f6e5 | 139 | const char *leftover = NULL; |
f3ed775e DG |
140 | |
141 | pc = poptGetContext(NULL, argc, argv, long_options, 0); | |
142 | poptReadDefaultConfig(pc, 0); | |
143 | ||
144 | while ((opt = poptGetNextOpt(pc)) != -1) { | |
145 | switch (opt) { | |
146 | case OPT_HELP: | |
4ba92f18 | 147 | SHOW_HELP(); |
f3ed775e | 148 | goto end; |
679b4943 SM |
149 | case OPT_LIST_OPTIONS: |
150 | list_cmd_options(stdout, long_options); | |
679b4943 | 151 | goto end; |
f3ed775e | 152 | default: |
f3ed775e DG |
153 | ret = CMD_UNDEFINED; |
154 | goto end; | |
155 | } | |
156 | } | |
157 | ||
5b915816 | 158 | arg_session_name = poptGetArg(pc); |
f3ed775e | 159 | |
68c7f6e5 JD |
160 | leftover = poptGetArg(pc); |
161 | if (leftover) { | |
162 | ERR("Unknown argument: %s", leftover); | |
163 | ret = CMD_ERROR; | |
164 | goto end; | |
165 | } | |
166 | ||
1cfc0bc8 JRJ |
167 | /* Mi check */ |
168 | if (lttng_opt_mi) { | |
169 | writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi); | |
170 | if (!writer) { | |
171 | ret = -LTTNG_ERR_NOMEM; | |
172 | goto end; | |
173 | } | |
174 | ||
175 | /* Open command element */ | |
176 | ret = mi_lttng_writer_command_open(writer, | |
177 | mi_lttng_element_command_start); | |
178 | if (ret) { | |
179 | ret = CMD_ERROR; | |
180 | goto end; | |
181 | } | |
182 | ||
183 | /* Open output element */ | |
184 | ret = mi_lttng_writer_open_element(writer, | |
185 | mi_lttng_element_command_output); | |
186 | if (ret) { | |
187 | ret = CMD_ERROR; | |
188 | goto end; | |
189 | } | |
190 | ||
191 | /* | |
192 | * Open sessions element | |
193 | * For validation purpose | |
194 | */ | |
195 | ret = mi_lttng_writer_open_element(writer, | |
196 | config_element_sessions); | |
197 | if (ret) { | |
198 | ret = CMD_ERROR; | |
199 | goto end; | |
200 | } | |
201 | } | |
202 | ||
5b915816 | 203 | command_ret = start_tracing(arg_session_name); |
1cfc0bc8 JRJ |
204 | if (command_ret) { |
205 | success = 0; | |
206 | } | |
207 | ||
208 | /* Mi closing */ | |
209 | if (lttng_opt_mi) { | |
210 | /* Close sessions and output element */ | |
211 | ret = mi_lttng_close_multi_element(writer, 2); | |
212 | if (ret) { | |
213 | ret = CMD_ERROR; | |
214 | goto end; | |
215 | } | |
216 | ||
217 | /* Success ? */ | |
218 | ret = mi_lttng_writer_write_element_bool(writer, | |
219 | mi_lttng_element_command_success, success); | |
220 | if (ret) { | |
221 | ret = CMD_ERROR; | |
222 | goto end; | |
223 | } | |
224 | ||
225 | /* Command element close */ | |
226 | ret = mi_lttng_writer_command_close(writer); | |
227 | if (ret) { | |
228 | ret = CMD_ERROR; | |
229 | goto end; | |
230 | } | |
231 | } | |
f3ed775e DG |
232 | |
233 | end: | |
1cfc0bc8 JRJ |
234 | /* Mi clean-up */ |
235 | if (writer && mi_lttng_writer_destroy(writer)) { | |
236 | /* Preserve original error code */ | |
237 | ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL; | |
238 | } | |
239 | ||
240 | /* Overwrite ret if an error occurred with start_tracing */ | |
241 | ret = command_ret ? command_ret : ret; | |
ca1c3607 | 242 | poptFreeContext(pc); |
f3ed775e DG |
243 | return ret; |
244 | } |