2 * Copyright (C) 2011 EfficiOS Inc.
4 * SPDX-License-Identifier: GPL-2.0-only
9 #include "../command.hpp"
10 #include "../utils.hpp"
12 #include <common/exception.hpp>
13 #include <common/mi-lttng.hpp>
14 #include <common/sessiond-comm/sessiond-comm.hpp>
21 #include <sys/types.h>
32 struct mi_writer
*writer
;
34 #ifdef LTTNG_EMBED_HELP
35 const char help_msg
[] =
36 #include <lttng-start.1.h>
40 struct poptOption long_options
[] = {
41 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
42 { "help", 'h', POPT_ARG_NONE
, nullptr, OPT_HELP
, nullptr, nullptr },
43 { "list-options", 0, POPT_ARG_NONE
, nullptr, OPT_LIST_OPTIONS
, nullptr, nullptr },
44 { "glob", 'g', POPT_ARG_NONE
, nullptr, OPT_ENABLE_GLOB
, nullptr, nullptr },
45 { "all", 'a', POPT_ARG_NONE
, nullptr, OPT_ALL
, nullptr, nullptr },
46 { nullptr, 0, 0, nullptr, 0, nullptr, nullptr }
49 int mi_print_session(const char *session_name
, int enabled
)
53 /* Open session element */
54 ret
= mi_lttng_writer_open_element(writer
, config_element_session
);
59 /* Print session name element */
60 ret
= mi_lttng_writer_write_element_string(writer
, config_element_name
, session_name
);
65 ret
= mi_lttng_writer_write_element_bool(writer
, config_element_enabled
, enabled
);
70 /* Close session element */
71 ret
= mi_lttng_writer_close_element(writer
);
80 * Start tracing for all trace of the session.
82 cmd_error_code
start_tracing(const char *session_name
)
84 if (session_name
== nullptr) {
88 DBG("Starting tracing for session `%s`", session_name
);
90 const int ret
= lttng_start_tracing(session_name
);
92 LTTNG_THROW_CTL(fmt::format("Failed to start session `{}`", session_name
),
93 static_cast<lttng_error_code
>(-ret
));
96 MSG("Tracing started for session `%s`", session_name
);
98 if (mi_print_session(session_name
, 1)) {
106 cmd_error_code
start_tracing(const session_spec
& spec
) noexcept
108 bool had_warning
= false;
109 bool had_error
= false;
110 bool listing_failed
= false;
112 const auto sessions
= [&listing_failed
, &spec
]() -> session_list
{
114 return list_sessions(spec
);
115 } catch (const lttng::ctl::error
& ctl_exception
) {
116 ERR_FMT("Failed to list sessions ({})",
117 lttng_strerror(-ctl_exception
.code()));
118 listing_failed
= true;
123 if (!listing_failed
&& sessions
.size() == 0 && spec
.type
== session_spec::type::NAME
) {
124 ERR_FMT("Session `{}` not found", spec
.value
);
128 if (listing_failed
) {
132 for (const auto& session
: sessions
) {
133 cmd_error_code sub_ret
;
136 sub_ret
= start_tracing(session
.name
);
137 } catch (const lttng::ctl::error
& ctl_exception
) {
138 switch (ctl_exception
.code()) {
139 case LTTNG_ERR_TRACE_ALREADY_STARTED
:
140 WARN_FMT("Tracing already started for session `{}`", session
.name
);
141 sub_ret
= CMD_SUCCESS
;
143 case LTTNG_ERR_NO_SESSION
:
144 if (spec
.type
!= session_spec::type::NAME
) {
145 /* Session destroyed during command, ignore and carry-on. */
146 sub_ret
= CMD_SUCCESS
;
152 case LTTNG_ERR_NO_SESSIOND
:
153 /* Don't keep going on a fatal error. */
158 ERR_FMT("Failed to start session `{}` ({})",
160 lttng_strerror(-ctl_exception
.code()));
165 /* Keep going, but report the most serious state. */
166 had_warning
|= sub_ret
== CMD_WARNING
;
167 had_error
|= sub_ret
== CMD_ERROR
;
172 } else if (had_warning
) {
183 * The 'start <options>' first level command
185 int cmd_start(int argc
, const char **argv
)
188 cmd_error_code command_ret
= CMD_SUCCESS
;
190 static poptContext pc
;
191 const char *leftover
= nullptr;
192 session_spec session_spec
= {
193 .type
= session_spec::NAME
,
197 pc
= poptGetContext(nullptr, argc
, argv
, long_options
, 0);
198 poptReadDefaultConfig(pc
, 0);
200 while ((opt
= poptGetNextOpt(pc
)) != -1) {
207 command_ret
= static_cast<cmd_error_code
>(ret
);
210 case OPT_LIST_OPTIONS
:
211 list_cmd_options(stdout
, long_options
);
213 case OPT_ENABLE_GLOB
:
214 session_spec
.type
= session_spec::GLOB_PATTERN
;
217 session_spec
.type
= session_spec::ALL
;
220 command_ret
= CMD_UNDEFINED
;
225 session_spec
.value
= poptGetArg(pc
);
227 leftover
= poptGetArg(pc
);
229 ERR("Unknown argument: %s", leftover
);
230 command_ret
= CMD_ERROR
;
236 writer
= mi_lttng_writer_create(fileno(stdout
), lttng_opt_mi
);
238 command_ret
= CMD_ERROR
;
242 /* Open command element */
243 if (mi_lttng_writer_command_open(writer
, mi_lttng_element_command_start
)) {
244 command_ret
= CMD_ERROR
;
248 /* Open output element */
249 if (mi_lttng_writer_open_element(writer
, mi_lttng_element_command_output
)) {
250 command_ret
= CMD_ERROR
;
255 * Open sessions element
256 * For validation purpose
258 if (mi_lttng_writer_open_element(writer
, config_element_sessions
)) {
259 command_ret
= CMD_ERROR
;
264 command_ret
= start_tracing(session_spec
);
265 if (command_ret
!= CMD_SUCCESS
) {
271 /* Close sessions and output element */
272 if (mi_lttng_close_multi_element(writer
, 2)) {
273 command_ret
= CMD_ERROR
;
278 if (mi_lttng_writer_write_element_bool(
279 writer
, mi_lttng_element_command_success
, success
)) {
280 command_ret
= CMD_ERROR
;
284 /* Command element close */
285 if (mi_lttng_writer_command_close(writer
)) {
286 command_ret
= CMD_ERROR
;
293 if (writer
&& mi_lttng_writer_destroy(writer
)) {
294 command_ret
= CMD_ERROR
;