2 * Copyright (C) 2011 EfficiOS Inc.
4 * SPDX-License-Identifier: GPL-2.0-only
14 #include <sys/types.h>
17 #include <common/sessiond-comm/sessiond-comm.h>
18 #include <common/mi-lttng.h>
20 #include "../command.h"
23 static struct mi_writer
*writer
;
25 #ifdef LTTNG_EMBED_HELP
26 static const char help_msg
[] =
27 #include <lttng-start.1.h>
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},
39 {"list-options", 0, POPT_ARG_NONE
, NULL
, OPT_LIST_OPTIONS
, NULL
, NULL
},
43 static int mi_print_session(char *session_name
, int enabled
)
47 /* Open session element */
48 ret
= mi_lttng_writer_open_element(writer
, config_element_session
);
53 /* Print session name element */
54 ret
= mi_lttng_writer_write_element_string(writer
, config_element_name
,
60 ret
= mi_lttng_writer_write_element_bool(writer
, config_element_enabled
,
66 /* Close session element */
67 ret
= mi_lttng_writer_close_element(writer
);
76 * Start tracing for all trace of the session.
78 static int start_tracing(const char *arg_session_name
)
83 if (arg_session_name
== NULL
) {
84 session_name
= get_session_name();
86 session_name
= strdup(arg_session_name
);
87 if (session_name
== NULL
) {
88 PERROR("Failed to copy session name");
92 if (session_name
== NULL
) {
97 DBG("Starting tracing for session %s", session_name
);
99 ret
= lttng_start_tracing(session_name
);
102 case LTTNG_ERR_TRACE_ALREADY_STARTED
:
103 WARN("Tracing already started for session %s", session_name
);
106 ERR("%s", lttng_strerror(ret
));
114 MSG("Tracing started for session %s", session_name
);
116 ret
= mi_print_session(session_name
, 1);
132 * The 'start <options>' first level command
134 int cmd_start(int argc
, const char **argv
)
136 int opt
, ret
= CMD_SUCCESS
, command_ret
= CMD_SUCCESS
, success
= 1;
137 static poptContext pc
;
138 const char *arg_session_name
= NULL
;
139 const char *leftover
= NULL
;
141 pc
= poptGetContext(NULL
, argc
, argv
, long_options
, 0);
142 poptReadDefaultConfig(pc
, 0);
144 while ((opt
= poptGetNextOpt(pc
)) != -1) {
149 case OPT_LIST_OPTIONS
:
150 list_cmd_options(stdout
, long_options
);
158 arg_session_name
= poptGetArg(pc
);
160 leftover
= poptGetArg(pc
);
162 ERR("Unknown argument: %s", leftover
);
169 writer
= mi_lttng_writer_create(fileno(stdout
), lttng_opt_mi
);
171 ret
= -LTTNG_ERR_NOMEM
;
175 /* Open command element */
176 ret
= mi_lttng_writer_command_open(writer
,
177 mi_lttng_element_command_start
);
183 /* Open output element */
184 ret
= mi_lttng_writer_open_element(writer
,
185 mi_lttng_element_command_output
);
192 * Open sessions element
193 * For validation purpose
195 ret
= mi_lttng_writer_open_element(writer
,
196 config_element_sessions
);
203 command_ret
= start_tracing(arg_session_name
);
210 /* Close sessions and output element */
211 ret
= mi_lttng_close_multi_element(writer
, 2);
218 ret
= mi_lttng_writer_write_element_bool(writer
,
219 mi_lttng_element_command_success
, success
);
225 /* Command element close */
226 ret
= mi_lttng_writer_command_close(writer
);
235 if (writer
&& mi_lttng_writer_destroy(writer
)) {
236 /* Preserve original error code */
237 ret
= ret
? ret
: -LTTNG_ERR_MI_IO_FAIL
;
240 /* Overwrite ret if an error occurred with start_tracing */
241 ret
= command_ret
? command_ret
: ret
;