2 * Copyright (C) 2011 EfficiOS Inc.
4 * SPDX-License-Identifier: GPL-2.0-only
9 #include "../command.hpp"
10 #include "../exception.hpp"
11 #include "../utils.hpp"
13 #include <common/exception.hpp>
14 #include <common/mi-lttng.hpp>
15 #include <common/sessiond-comm/sessiond-comm.hpp>
22 #include <sys/types.h>
33 struct mi_writer
*writer
;
35 #ifdef LTTNG_EMBED_HELP
36 const char help_msg
[] =
37 #include <lttng-start.1.h>
41 struct poptOption long_options
[] = {
42 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
43 { "help", 'h', POPT_ARG_NONE
, nullptr, OPT_HELP
, nullptr, nullptr },
44 { "list-options", 0, POPT_ARG_NONE
, nullptr, OPT_LIST_OPTIONS
, nullptr, nullptr },
45 { "glob", 'g', POPT_ARG_NONE
, nullptr, OPT_ENABLE_GLOB
, nullptr, nullptr },
46 { "all", 'a', POPT_ARG_NONE
, nullptr, OPT_ALL
, nullptr, nullptr },
47 { nullptr, 0, 0, nullptr, 0, nullptr, nullptr }
50 int mi_print_session(const char *session_name
, int enabled
)
54 /* Open session element */
55 ret
= mi_lttng_writer_open_element(writer
, config_element_session
);
60 /* Print session name element */
61 ret
= mi_lttng_writer_write_element_string(writer
, config_element_name
, session_name
);
66 ret
= mi_lttng_writer_write_element_bool(writer
, config_element_enabled
, enabled
);
71 /* Close session element */
72 ret
= mi_lttng_writer_close_element(writer
);
81 * Start tracing for all trace of the session.
83 cmd_error_code
start_tracing(const char *session_name
)
85 if (session_name
== nullptr) {
89 DBG("Starting tracing for session `%s`", session_name
);
91 const int ret
= lttng_start_tracing(session_name
);
93 LTTNG_THROW_CTL(lttng::format("Failed to start session `{}`", session_name
),
94 static_cast<lttng_error_code
>(-ret
));
97 MSG("Tracing started for session `%s`", session_name
);
99 if (mi_print_session(session_name
, 1)) {
107 cmd_error_code
start_tracing(const lttng::cli::session_spec
& spec
)
109 bool had_warning
= false;
110 bool had_error
= false;
111 bool listing_failed
= false;
113 const auto sessions
= [&listing_failed
, &spec
]() -> lttng::cli::session_list
{
115 return list_sessions(spec
);
116 } catch (const lttng::ctl::error
& ctl_exception
) {
117 ERR_FMT("Failed to list sessions ({})",
118 lttng_strerror(-ctl_exception
.code()));
119 listing_failed
= true;
121 } catch (const lttng::cli::no_default_session_error
& cli_exception
) {
123 * The retrieval of the default session name already logs
124 * an error when it fails. There is no value in printing
125 * anything about this exception.
127 listing_failed
= true;
132 if (!listing_failed
&& sessions
.size() == 0 &&
133 spec
.type_
== lttng::cli::session_spec::type::NAME
) {
134 ERR_FMT("Session `{}` not found", spec
.value
);
138 if (listing_failed
) {
142 for (const auto& session
: sessions
) {
143 cmd_error_code sub_ret
;
146 sub_ret
= start_tracing(session
.name
);
147 } catch (const lttng::ctl::error
& ctl_exception
) {
148 switch (ctl_exception
.code()) {
149 case LTTNG_ERR_TRACE_ALREADY_STARTED
:
150 WARN_FMT("Tracing already started for session `{}`", session
.name
);
151 sub_ret
= CMD_SUCCESS
;
153 case LTTNG_ERR_NO_SESSION
:
154 if (spec
.type_
!= lttng::cli::session_spec::type::NAME
) {
155 /* Session destroyed during command, ignore and carry-on. */
156 sub_ret
= CMD_SUCCESS
;
162 case LTTNG_ERR_NO_SESSIOND
:
163 /* Don't keep going on a fatal error. */
168 ERR_FMT("Failed to start session `{}` ({})",
170 lttng_strerror(-ctl_exception
.code()));
175 /* Keep going, but report the most serious state. */
176 had_warning
|= sub_ret
== CMD_WARNING
;
177 had_error
|= sub_ret
== CMD_ERROR
;
182 } else if (had_warning
) {
193 * The 'start <options>' first level command
195 int cmd_start(int argc
, const char **argv
)
198 cmd_error_code command_ret
= CMD_SUCCESS
;
200 static poptContext pc
;
201 const char *leftover
= nullptr;
202 lttng::cli::session_spec
session_spec(lttng::cli::session_spec::type::NAME
);
204 pc
= poptGetContext(nullptr, argc
, argv
, long_options
, 0);
205 poptReadDefaultConfig(pc
, 0);
207 while ((opt
= poptGetNextOpt(pc
)) != -1) {
214 command_ret
= static_cast<cmd_error_code
>(ret
);
217 case OPT_LIST_OPTIONS
:
218 list_cmd_options(stdout
, long_options
);
220 case OPT_ENABLE_GLOB
:
221 session_spec
.type_
= lttng::cli::session_spec::type::GLOB_PATTERN
;
224 session_spec
.type_
= lttng::cli::session_spec::type::ALL
;
227 command_ret
= CMD_UNDEFINED
;
232 session_spec
.value
= poptGetArg(pc
);
234 leftover
= poptGetArg(pc
);
236 ERR("Unknown argument: %s", leftover
);
237 command_ret
= CMD_ERROR
;
243 writer
= mi_lttng_writer_create(fileno(stdout
), lttng_opt_mi
);
245 command_ret
= CMD_ERROR
;
249 /* Open command element */
250 if (mi_lttng_writer_command_open(writer
, mi_lttng_element_command_start
)) {
251 command_ret
= CMD_ERROR
;
255 /* Open output element */
256 if (mi_lttng_writer_open_element(writer
, mi_lttng_element_command_output
)) {
257 command_ret
= CMD_ERROR
;
262 * Open sessions element
263 * For validation purpose
265 if (mi_lttng_writer_open_element(writer
, config_element_sessions
)) {
266 command_ret
= CMD_ERROR
;
271 command_ret
= start_tracing(session_spec
);
272 if (command_ret
!= CMD_SUCCESS
) {
278 /* Close sessions and output element */
279 if (mi_lttng_close_multi_element(writer
, 2)) {
280 command_ret
= CMD_ERROR
;
285 if (mi_lttng_writer_write_element_bool(
286 writer
, mi_lttng_element_command_success
, success
)) {
287 command_ret
= CMD_ERROR
;
291 /* Command element close */
292 if (mi_lttng_writer_command_close(writer
)) {
293 command_ret
= CMD_ERROR
;
300 if (writer
&& mi_lttng_writer_destroy(writer
)) {
301 command_ret
= CMD_ERROR
;