2 * Copyright (C) 2011 EfficiOS Inc.
4 * SPDX-License-Identifier: GPL-2.0-only
9 #include "../command.hpp"
11 #include <common/mi-lttng.hpp>
12 #include <common/sessiond-comm/sessiond-comm.hpp>
19 #include <sys/types.h>
22 static int opt_no_wait
;
23 static struct mi_writer
*writer
;
25 #ifdef LTTNG_EMBED_HELP
26 static const char help_msg
[] =
27 #include <lttng-stop.1.h>
36 static struct poptOption long_options
[] = {
37 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
38 { "help", 'h', POPT_ARG_NONE
, nullptr, OPT_HELP
, nullptr, nullptr },
39 { "list-options", 0, POPT_ARG_NONE
, nullptr, OPT_LIST_OPTIONS
, nullptr, nullptr },
40 { "no-wait", 'n', POPT_ARG_VAL
, &opt_no_wait
, 1, nullptr, nullptr },
41 { nullptr, 0, 0, nullptr, 0, nullptr, nullptr }
45 * Mi print of partial session
47 static int mi_print_session(char *session_name
, int enabled
)
51 LTTNG_ASSERT(session_name
);
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
);
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
);
79 * Start tracing for all trace of the session.
81 static int stop_tracing(const char *arg_session_name
)
86 if (arg_session_name
== nullptr) {
87 session_name
= get_session_name();
89 session_name
= strdup(arg_session_name
);
90 if (session_name
== nullptr) {
91 PERROR("Failed to copy session name");
95 if (session_name
== nullptr) {
100 ret
= lttng_stop_tracing_no_wait(session_name
);
103 case LTTNG_ERR_TRACE_ALREADY_STOPPED
:
104 WARN("Tracing already stopped for session %s", session_name
);
107 ERR("%s", lttng_strerror(ret
));
114 _MSG("Waiting for data availability");
117 ret
= lttng_data_pending(session_name
);
119 /* Return the data available call error. */
124 * Data sleep time before retrying (in usec). Don't sleep if the call
125 * returned value indicates availability.
128 usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME_US
);
138 print_session_stats(session_name
);
139 MSG("Tracing stopped for session %s", session_name
);
141 ret
= mi_print_session(session_name
, 0);
157 * The 'stop <options>' first level command
159 int cmd_stop(int argc
, const char **argv
)
161 int opt
, ret
= CMD_SUCCESS
, command_ret
= CMD_SUCCESS
, success
= 1;
162 static poptContext pc
;
163 const char *arg_session_name
= nullptr;
164 const char *leftover
= nullptr;
166 pc
= poptGetContext(nullptr, argc
, argv
, long_options
, 0);
167 poptReadDefaultConfig(pc
, 0);
169 while ((opt
= poptGetNextOpt(pc
)) != -1) {
174 case OPT_LIST_OPTIONS
:
175 list_cmd_options(stdout
, long_options
);
185 writer
= mi_lttng_writer_create(fileno(stdout
), lttng_opt_mi
);
187 ret
= -LTTNG_ERR_NOMEM
;
191 /* Open command element */
192 ret
= mi_lttng_writer_command_open(writer
, mi_lttng_element_command_stop
);
198 /* Open output element */
199 ret
= mi_lttng_writer_open_element(writer
, mi_lttng_element_command_output
);
206 * Open sessions element
209 ret
= mi_lttng_writer_open_element(writer
, config_element_sessions
);
216 arg_session_name
= poptGetArg(pc
);
218 leftover
= poptGetArg(pc
);
220 ERR("Unknown argument: %s", leftover
);
225 command_ret
= stop_tracing(arg_session_name
);
232 /* Close sessions and output element */
233 ret
= mi_lttng_close_multi_element(writer
, 2);
240 ret
= mi_lttng_writer_write_element_bool(
241 writer
, mi_lttng_element_command_success
, success
);
247 /* Command element close */
248 ret
= mi_lttng_writer_command_close(writer
);
257 if (writer
&& mi_lttng_writer_destroy(writer
)) {
258 /* Preserve original error code */
259 ret
= ret
? ret
: -LTTNG_ERR_MI_IO_FAIL
;
262 /* Overwrite ret if an error occurred in stop_tracing() */
263 ret
= command_ret
? command_ret
: ret
;