| 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 | struct mi_writer *writer; |
| 33 | |
| 34 | #ifdef LTTNG_EMBED_HELP |
| 35 | const char help_msg[] = |
| 36 | #include <lttng-start.1.h> |
| 37 | ; |
| 38 | #endif |
| 39 | |
| 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 } |
| 47 | }; |
| 48 | |
| 49 | int mi_print_session(const char *session_name, int enabled) |
| 50 | { |
| 51 | int ret; |
| 52 | |
| 53 | /* Open session element */ |
| 54 | ret = mi_lttng_writer_open_element(writer, config_element_session); |
| 55 | if (ret) { |
| 56 | goto end; |
| 57 | } |
| 58 | |
| 59 | /* Print session name element */ |
| 60 | ret = mi_lttng_writer_write_element_string(writer, config_element_name, session_name); |
| 61 | if (ret) { |
| 62 | goto end; |
| 63 | } |
| 64 | |
| 65 | ret = mi_lttng_writer_write_element_bool(writer, config_element_enabled, enabled); |
| 66 | if (ret) { |
| 67 | goto end; |
| 68 | } |
| 69 | |
| 70 | /* Close session element */ |
| 71 | ret = mi_lttng_writer_close_element(writer); |
| 72 | |
| 73 | end: |
| 74 | return ret; |
| 75 | } |
| 76 | |
| 77 | /* |
| 78 | * start_tracing |
| 79 | * |
| 80 | * Start tracing for all trace of the session. |
| 81 | */ |
| 82 | cmd_error_code start_tracing(const char *session_name) |
| 83 | { |
| 84 | if (session_name == nullptr) { |
| 85 | return CMD_ERROR; |
| 86 | } |
| 87 | |
| 88 | DBG("Starting tracing for session `%s`", session_name); |
| 89 | |
| 90 | const int ret = lttng_start_tracing(session_name); |
| 91 | if (ret < 0) { |
| 92 | LTTNG_THROW_CTL(fmt::format("Failed to start session `{}`", session_name), |
| 93 | static_cast<lttng_error_code>(-ret)); |
| 94 | } |
| 95 | |
| 96 | MSG("Tracing started for session `%s`", session_name); |
| 97 | if (lttng_opt_mi) { |
| 98 | if (mi_print_session(session_name, 1)) { |
| 99 | return CMD_ERROR; |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | return CMD_SUCCESS; |
| 104 | } |
| 105 | |
| 106 | cmd_error_code start_tracing(const session_spec& spec) noexcept |
| 107 | { |
| 108 | bool had_warning = false; |
| 109 | bool had_error = false; |
| 110 | bool listing_failed = false; |
| 111 | |
| 112 | const auto sessions = [&listing_failed, &spec]() -> session_list { |
| 113 | try { |
| 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; |
| 119 | return {}; |
| 120 | } |
| 121 | }(); |
| 122 | |
| 123 | if (!listing_failed && sessions.size() == 0 && spec.type == session_spec::type::NAME) { |
| 124 | ERR_FMT("Session `{}` not found", spec.value); |
| 125 | return CMD_ERROR; |
| 126 | } |
| 127 | |
| 128 | if (listing_failed) { |
| 129 | return CMD_FATAL; |
| 130 | } |
| 131 | |
| 132 | for (const auto& session : sessions) { |
| 133 | cmd_error_code sub_ret; |
| 134 | |
| 135 | try { |
| 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; |
| 142 | break; |
| 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; |
| 147 | break; |
| 148 | } else { |
| 149 | sub_ret = CMD_ERROR; |
| 150 | break; |
| 151 | } |
| 152 | case LTTNG_ERR_NO_SESSIOND: |
| 153 | /* Don't keep going on a fatal error. */ |
| 154 | return CMD_FATAL; |
| 155 | default: |
| 156 | /* Generic error. */ |
| 157 | sub_ret = CMD_ERROR; |
| 158 | ERR_FMT("Failed to start session `{}` ({})", |
| 159 | session.name, |
| 160 | lttng_strerror(-ctl_exception.code())); |
| 161 | break; |
| 162 | } |
| 163 | } |
| 164 | |
| 165 | /* Keep going, but report the most serious state. */ |
| 166 | had_warning |= sub_ret == CMD_WARNING; |
| 167 | had_error |= sub_ret == CMD_ERROR; |
| 168 | } |
| 169 | |
| 170 | if (had_error) { |
| 171 | return CMD_ERROR; |
| 172 | } else if (had_warning) { |
| 173 | return CMD_WARNING; |
| 174 | } else { |
| 175 | return CMD_SUCCESS; |
| 176 | } |
| 177 | } |
| 178 | } /* namespace */ |
| 179 | |
| 180 | /* |
| 181 | * cmd_start |
| 182 | * |
| 183 | * The 'start <options>' first level command |
| 184 | */ |
| 185 | int cmd_start(int argc, const char **argv) |
| 186 | { |
| 187 | int opt; |
| 188 | cmd_error_code command_ret = CMD_SUCCESS; |
| 189 | bool success = true; |
| 190 | static poptContext pc; |
| 191 | const char *leftover = nullptr; |
| 192 | session_spec session_spec = { |
| 193 | .type = session_spec::NAME, |
| 194 | .value = nullptr, |
| 195 | }; |
| 196 | |
| 197 | pc = poptGetContext(nullptr, argc, argv, long_options, 0); |
| 198 | poptReadDefaultConfig(pc, 0); |
| 199 | |
| 200 | while ((opt = poptGetNextOpt(pc)) != -1) { |
| 201 | switch (opt) { |
| 202 | case OPT_HELP: |
| 203 | { |
| 204 | int ret; |
| 205 | |
| 206 | SHOW_HELP(); |
| 207 | command_ret = static_cast<cmd_error_code>(ret); |
| 208 | goto end; |
| 209 | } |
| 210 | case OPT_LIST_OPTIONS: |
| 211 | list_cmd_options(stdout, long_options); |
| 212 | goto end; |
| 213 | case OPT_ENABLE_GLOB: |
| 214 | session_spec.type = session_spec::GLOB_PATTERN; |
| 215 | break; |
| 216 | case OPT_ALL: |
| 217 | session_spec.type = session_spec::ALL; |
| 218 | break; |
| 219 | default: |
| 220 | command_ret = CMD_UNDEFINED; |
| 221 | goto end; |
| 222 | } |
| 223 | } |
| 224 | |
| 225 | session_spec.value = poptGetArg(pc); |
| 226 | |
| 227 | leftover = poptGetArg(pc); |
| 228 | if (leftover) { |
| 229 | ERR("Unknown argument: %s", leftover); |
| 230 | command_ret = CMD_ERROR; |
| 231 | goto end; |
| 232 | } |
| 233 | |
| 234 | /* Mi check */ |
| 235 | if (lttng_opt_mi) { |
| 236 | writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi); |
| 237 | if (!writer) { |
| 238 | command_ret = CMD_ERROR; |
| 239 | goto end; |
| 240 | } |
| 241 | |
| 242 | /* Open command element */ |
| 243 | if (mi_lttng_writer_command_open(writer, mi_lttng_element_command_start)) { |
| 244 | command_ret = CMD_ERROR; |
| 245 | goto end; |
| 246 | } |
| 247 | |
| 248 | /* Open output element */ |
| 249 | if (mi_lttng_writer_open_element(writer, mi_lttng_element_command_output)) { |
| 250 | command_ret = CMD_ERROR; |
| 251 | goto end; |
| 252 | } |
| 253 | |
| 254 | /* |
| 255 | * Open sessions element |
| 256 | * For validation purpose |
| 257 | */ |
| 258 | if (mi_lttng_writer_open_element(writer, config_element_sessions)) { |
| 259 | command_ret = CMD_ERROR; |
| 260 | goto end; |
| 261 | } |
| 262 | } |
| 263 | |
| 264 | command_ret = start_tracing(session_spec); |
| 265 | if (command_ret != CMD_SUCCESS) { |
| 266 | success = false; |
| 267 | } |
| 268 | |
| 269 | /* Mi closing */ |
| 270 | if (lttng_opt_mi) { |
| 271 | /* Close sessions and output element */ |
| 272 | if (mi_lttng_close_multi_element(writer, 2)) { |
| 273 | command_ret = CMD_ERROR; |
| 274 | goto end; |
| 275 | } |
| 276 | |
| 277 | /* Success ? */ |
| 278 | if (mi_lttng_writer_write_element_bool( |
| 279 | writer, mi_lttng_element_command_success, success)) { |
| 280 | command_ret = CMD_ERROR; |
| 281 | goto end; |
| 282 | } |
| 283 | |
| 284 | /* Command element close */ |
| 285 | if (mi_lttng_writer_command_close(writer)) { |
| 286 | command_ret = CMD_ERROR; |
| 287 | goto end; |
| 288 | } |
| 289 | } |
| 290 | |
| 291 | end: |
| 292 | /* Mi clean-up */ |
| 293 | if (writer && mi_lttng_writer_destroy(writer)) { |
| 294 | command_ret = CMD_ERROR; |
| 295 | } |
| 296 | |
| 297 | poptFreeContext(pc); |
| 298 | return command_ret; |
| 299 | } |