| 1 | /* |
| 2 | * Copyright (C) 2011 EfficiOS Inc. |
| 3 | * |
| 4 | * SPDX-License-Identifier: GPL-2.0-only |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #define _LGPL_SOURCE |
| 9 | #include "../command.hpp" |
| 10 | #include "../utils.hpp" |
| 11 | |
| 12 | #include <common/exception.hpp> |
| 13 | #include <common/mi-lttng.hpp> |
| 14 | #include <common/sessiond-comm/sessiond-comm.hpp> |
| 15 | |
| 16 | #include <popt.h> |
| 17 | #include <stdio.h> |
| 18 | #include <stdlib.h> |
| 19 | #include <string.h> |
| 20 | #include <sys/stat.h> |
| 21 | #include <sys/types.h> |
| 22 | #include <unistd.h> |
| 23 | |
| 24 | enum { |
| 25 | OPT_HELP = 1, |
| 26 | OPT_LIST_OPTIONS, |
| 27 | OPT_ENABLE_GLOB, |
| 28 | OPT_ALL, |
| 29 | }; |
| 30 | |
| 31 | namespace { |
| 32 | int opt_no_wait; |
| 33 | struct mi_writer *writer; |
| 34 | |
| 35 | #ifdef LTTNG_EMBED_HELP |
| 36 | const char help_msg[] = |
| 37 | #include <lttng-stop.1.h> |
| 38 | ; |
| 39 | #endif |
| 40 | |
| 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 | { "no-wait", 'n', POPT_ARG_VAL, &opt_no_wait, 1, nullptr, nullptr }, |
| 46 | { "glob", 'g', POPT_ARG_NONE, nullptr, OPT_ENABLE_GLOB, nullptr, nullptr }, |
| 47 | { "all", 'a', POPT_ARG_NONE, nullptr, OPT_ALL, nullptr, nullptr }, |
| 48 | { nullptr, 0, 0, nullptr, 0, nullptr, nullptr } |
| 49 | }; |
| 50 | |
| 51 | /* |
| 52 | * Mi print of partial session |
| 53 | */ |
| 54 | int mi_print_session(const char *session_name, int enabled) |
| 55 | { |
| 56 | int ret; |
| 57 | LTTNG_ASSERT(writer); |
| 58 | LTTNG_ASSERT(session_name); |
| 59 | |
| 60 | /* Open session element */ |
| 61 | ret = mi_lttng_writer_open_element(writer, config_element_session); |
| 62 | if (ret) { |
| 63 | goto end; |
| 64 | } |
| 65 | |
| 66 | /* Print session name element */ |
| 67 | ret = mi_lttng_writer_write_element_string(writer, config_element_name, session_name); |
| 68 | if (ret) { |
| 69 | goto end; |
| 70 | } |
| 71 | |
| 72 | /* Is enabled ? */ |
| 73 | ret = mi_lttng_writer_write_element_bool(writer, config_element_enabled, enabled); |
| 74 | if (ret) { |
| 75 | goto end; |
| 76 | } |
| 77 | |
| 78 | /* Close session element */ |
| 79 | ret = mi_lttng_writer_close_element(writer); |
| 80 | |
| 81 | end: |
| 82 | return ret; |
| 83 | } |
| 84 | |
| 85 | /* |
| 86 | * Start tracing for all trace of the session. |
| 87 | */ |
| 88 | cmd_error_code stop_tracing(const char *session_name) |
| 89 | { |
| 90 | int ret; |
| 91 | |
| 92 | ret = lttng_stop_tracing_no_wait(session_name); |
| 93 | if (ret < 0) { |
| 94 | LTTNG_THROW_CTL(fmt::format("Failed to start session `{}`", session_name), |
| 95 | static_cast<lttng_error_code>(-ret)); |
| 96 | } |
| 97 | |
| 98 | if (!opt_no_wait) { |
| 99 | _MSG("Waiting for data availability"); |
| 100 | fflush(stdout); |
| 101 | do { |
| 102 | ret = lttng_data_pending(session_name); |
| 103 | if (ret < 0) { |
| 104 | /* Return the data available call error. */ |
| 105 | ERR_FMT("Failed to check pending data for session `{}` ({})", |
| 106 | session_name, |
| 107 | lttng_strerror(ret)); |
| 108 | return CMD_ERROR; |
| 109 | } |
| 110 | |
| 111 | /* |
| 112 | * Data sleep time before retrying (in usec). Don't sleep if the call |
| 113 | * returned value indicates availability. |
| 114 | */ |
| 115 | if (ret) { |
| 116 | usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME_US); |
| 117 | _MSG("."); |
| 118 | fflush(stdout); |
| 119 | } |
| 120 | } while (ret != 0); |
| 121 | MSG(""); |
| 122 | } |
| 123 | |
| 124 | print_session_stats(session_name); |
| 125 | MSG("Tracing stopped for session `%s`", session_name); |
| 126 | if (lttng_opt_mi) { |
| 127 | if (mi_print_session(session_name, 0)) { |
| 128 | return CMD_ERROR; |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | return CMD_SUCCESS; |
| 133 | } |
| 134 | |
| 135 | cmd_error_code stop_tracing(const session_spec& spec) noexcept |
| 136 | { |
| 137 | bool had_warning = false; |
| 138 | bool had_error = false; |
| 139 | bool listing_failed = false; |
| 140 | |
| 141 | const auto sessions = [&listing_failed, &spec]() -> session_list { |
| 142 | try { |
| 143 | return list_sessions(spec); |
| 144 | } catch (const lttng::ctl::error& ctl_exception) { |
| 145 | ERR_FMT("Failed to list sessions ({})", |
| 146 | lttng_strerror(-ctl_exception.code())); |
| 147 | listing_failed = true; |
| 148 | return {}; |
| 149 | } |
| 150 | }(); |
| 151 | |
| 152 | if (!listing_failed && sessions.size() == 0 && spec.type == session_spec::type::NAME) { |
| 153 | ERR_FMT("Session `{}` not found", spec.value); |
| 154 | return CMD_ERROR; |
| 155 | } |
| 156 | |
| 157 | if (listing_failed) { |
| 158 | return CMD_FATAL; |
| 159 | } |
| 160 | |
| 161 | for (const auto& session : sessions) { |
| 162 | cmd_error_code sub_ret; |
| 163 | |
| 164 | try { |
| 165 | sub_ret = stop_tracing(session.name); |
| 166 | } catch (const lttng::ctl::error& ctl_exception) { |
| 167 | switch (ctl_exception.code()) { |
| 168 | case LTTNG_ERR_TRACE_ALREADY_STOPPED: |
| 169 | WARN_FMT("Tracing already stopped for session `{}`", session.name); |
| 170 | sub_ret = CMD_SUCCESS; |
| 171 | break; |
| 172 | case LTTNG_ERR_NO_SESSION: |
| 173 | if (spec.type != session_spec::type::NAME) { |
| 174 | /* Session destroyed during command, ignore and carry-on. */ |
| 175 | sub_ret = CMD_SUCCESS; |
| 176 | break; |
| 177 | } else { |
| 178 | sub_ret = CMD_ERROR; |
| 179 | break; |
| 180 | } |
| 181 | case LTTNG_ERR_NO_SESSIOND: |
| 182 | /* Don't keep going on a fatal error. */ |
| 183 | return CMD_FATAL; |
| 184 | default: |
| 185 | /* Generic error. */ |
| 186 | sub_ret = CMD_ERROR; |
| 187 | ERR_FMT("Failed to stop session `{}` ({})", |
| 188 | session.name, |
| 189 | lttng_strerror(-ctl_exception.code())); |
| 190 | break; |
| 191 | } |
| 192 | } |
| 193 | |
| 194 | /* Keep going, but report the most serious state. */ |
| 195 | had_warning |= sub_ret == CMD_WARNING; |
| 196 | had_error |= sub_ret == CMD_ERROR; |
| 197 | } |
| 198 | |
| 199 | if (had_error) { |
| 200 | return CMD_ERROR; |
| 201 | } else if (had_warning) { |
| 202 | return CMD_WARNING; |
| 203 | } else { |
| 204 | return CMD_SUCCESS; |
| 205 | } |
| 206 | } |
| 207 | } /* namespace */ |
| 208 | |
| 209 | /* |
| 210 | * cmd_stop |
| 211 | * |
| 212 | * The 'stop <options>' first level command |
| 213 | */ |
| 214 | int cmd_stop(int argc, const char **argv) |
| 215 | { |
| 216 | int opt; |
| 217 | cmd_error_code command_ret = CMD_SUCCESS; |
| 218 | bool success = true; |
| 219 | static poptContext pc; |
| 220 | const char *leftover = nullptr; |
| 221 | struct session_spec session_spec = { |
| 222 | .type = session_spec::NAME, |
| 223 | .value = nullptr, |
| 224 | }; |
| 225 | |
| 226 | pc = poptGetContext(nullptr, argc, argv, long_options, 0); |
| 227 | poptReadDefaultConfig(pc, 0); |
| 228 | |
| 229 | while ((opt = poptGetNextOpt(pc)) != -1) { |
| 230 | switch (opt) { |
| 231 | case OPT_HELP: |
| 232 | { |
| 233 | int ret; |
| 234 | |
| 235 | SHOW_HELP(); |
| 236 | command_ret = static_cast<cmd_error_code>(ret); |
| 237 | goto end; |
| 238 | } |
| 239 | case OPT_LIST_OPTIONS: |
| 240 | list_cmd_options(stdout, long_options); |
| 241 | goto end; |
| 242 | case OPT_ENABLE_GLOB: |
| 243 | session_spec.type = session_spec::GLOB_PATTERN; |
| 244 | break; |
| 245 | case OPT_ALL: |
| 246 | session_spec.type = session_spec::ALL; |
| 247 | break; |
| 248 | default: |
| 249 | command_ret = CMD_UNDEFINED; |
| 250 | goto end; |
| 251 | } |
| 252 | } |
| 253 | |
| 254 | /* Mi check */ |
| 255 | if (lttng_opt_mi) { |
| 256 | writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi); |
| 257 | if (!writer) { |
| 258 | command_ret = CMD_ERROR; |
| 259 | goto end; |
| 260 | } |
| 261 | |
| 262 | /* Open command element */ |
| 263 | if (mi_lttng_writer_command_open(writer, mi_lttng_element_command_stop)) { |
| 264 | command_ret = CMD_ERROR; |
| 265 | goto end; |
| 266 | } |
| 267 | |
| 268 | /* Open output element */ |
| 269 | if (mi_lttng_writer_open_element(writer, mi_lttng_element_command_output)) { |
| 270 | command_ret = CMD_ERROR; |
| 271 | goto end; |
| 272 | } |
| 273 | |
| 274 | /* |
| 275 | * Open sessions element |
| 276 | * For validation |
| 277 | */ |
| 278 | if (mi_lttng_writer_open_element(writer, config_element_sessions)) { |
| 279 | command_ret = CMD_ERROR; |
| 280 | goto end; |
| 281 | } |
| 282 | } |
| 283 | |
| 284 | session_spec.value = poptGetArg(pc); |
| 285 | |
| 286 | leftover = poptGetArg(pc); |
| 287 | if (leftover) { |
| 288 | ERR("Unknown argument: %s", leftover); |
| 289 | command_ret = CMD_ERROR; |
| 290 | goto end; |
| 291 | } |
| 292 | |
| 293 | command_ret = stop_tracing(session_spec); |
| 294 | if (command_ret) { |
| 295 | success = false; |
| 296 | } |
| 297 | |
| 298 | /* Mi closing */ |
| 299 | if (lttng_opt_mi) { |
| 300 | /* Close sessions and output element */ |
| 301 | if (mi_lttng_close_multi_element(writer, 2)) { |
| 302 | command_ret = CMD_ERROR; |
| 303 | goto end; |
| 304 | } |
| 305 | |
| 306 | /* Success ? */ |
| 307 | if (mi_lttng_writer_write_element_bool( |
| 308 | writer, mi_lttng_element_command_success, success)) { |
| 309 | command_ret = CMD_ERROR; |
| 310 | goto end; |
| 311 | } |
| 312 | |
| 313 | /* Command element close */ |
| 314 | if (mi_lttng_writer_command_close(writer)) { |
| 315 | command_ret = CMD_ERROR; |
| 316 | goto end; |
| 317 | } |
| 318 | } |
| 319 | |
| 320 | end: |
| 321 | /* Mi clean-up */ |
| 322 | if (writer && mi_lttng_writer_destroy(writer)) { |
| 323 | command_ret = CMD_ERROR; |
| 324 | } |
| 325 | |
| 326 | poptFreeContext(pc); |
| 327 | return command_ret; |
| 328 | } |