| 1 | /* |
| 2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License, version 2 only, |
| 6 | * as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along |
| 14 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 16 | */ |
| 17 | |
| 18 | #define _LGPL_SOURCE |
| 19 | #include <popt.h> |
| 20 | #include <stdio.h> |
| 21 | #include <stdlib.h> |
| 22 | #include <string.h> |
| 23 | #include <sys/stat.h> |
| 24 | #include <sys/types.h> |
| 25 | #include <unistd.h> |
| 26 | #include <stdbool.h> |
| 27 | |
| 28 | #include "../command.h" |
| 29 | |
| 30 | #include <common/mi-lttng.h> |
| 31 | #include <common/sessiond-comm/sessiond-comm.h> |
| 32 | #include <common/utils.h> |
| 33 | |
| 34 | static char *opt_session_name; |
| 35 | static int opt_destroy_all; |
| 36 | static int opt_no_wait; |
| 37 | |
| 38 | #ifdef LTTNG_EMBED_HELP |
| 39 | static const char help_msg[] = |
| 40 | #include <lttng-destroy.1.h> |
| 41 | ; |
| 42 | #endif |
| 43 | |
| 44 | /* Mi writer */ |
| 45 | static struct mi_writer *writer; |
| 46 | |
| 47 | enum { |
| 48 | OPT_HELP = 1, |
| 49 | OPT_LIST_OPTIONS, |
| 50 | }; |
| 51 | |
| 52 | static struct poptOption long_options[] = { |
| 53 | /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */ |
| 54 | {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0}, |
| 55 | {"all", 'a', POPT_ARG_VAL, &opt_destroy_all, 1, 0, 0}, |
| 56 | {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL}, |
| 57 | {"no-wait", 'n', POPT_ARG_VAL, &opt_no_wait, 1, 0, 0}, |
| 58 | {0, 0, 0, 0, 0, 0, 0} |
| 59 | }; |
| 60 | |
| 61 | /* |
| 62 | * destroy_session |
| 63 | * |
| 64 | * Unregister the provided session to the session daemon. On success, removes |
| 65 | * the default configuration. |
| 66 | */ |
| 67 | static int destroy_session(struct lttng_session *session) |
| 68 | { |
| 69 | int ret; |
| 70 | char *session_name = NULL; |
| 71 | bool session_was_stopped; |
| 72 | |
| 73 | ret = lttng_stop_tracing_no_wait(session->name); |
| 74 | if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) { |
| 75 | ERR("%s", lttng_strerror(ret)); |
| 76 | } |
| 77 | session_was_stopped = ret == -LTTNG_ERR_TRACE_ALREADY_STOPPED; |
| 78 | if (!opt_no_wait) { |
| 79 | bool printed_wait_msg = false; |
| 80 | |
| 81 | do { |
| 82 | ret = lttng_data_pending(session->name); |
| 83 | if (ret < 0) { |
| 84 | /* Return the data available call error. */ |
| 85 | goto error; |
| 86 | } |
| 87 | |
| 88 | /* |
| 89 | * Data sleep time before retrying (in usec). Don't sleep if the call |
| 90 | * returned value indicates availability. |
| 91 | */ |
| 92 | if (ret) { |
| 93 | if (!printed_wait_msg) { |
| 94 | _MSG("Waiting for data availability"); |
| 95 | fflush(stdout); |
| 96 | } |
| 97 | |
| 98 | printed_wait_msg = true; |
| 99 | usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME); |
| 100 | _MSG("."); |
| 101 | fflush(stdout); |
| 102 | } |
| 103 | } while (ret != 0); |
| 104 | if (printed_wait_msg) { |
| 105 | MSG(""); |
| 106 | } |
| 107 | } |
| 108 | if (!session_was_stopped) { |
| 109 | /* |
| 110 | * Don't print the event and packet loss warnings since the user |
| 111 | * already saw them when stopping the trace. |
| 112 | */ |
| 113 | print_session_stats(session->name); |
| 114 | } |
| 115 | |
| 116 | ret = lttng_destroy_session_no_wait(session->name); |
| 117 | if (ret < 0) { |
| 118 | goto error; |
| 119 | } |
| 120 | |
| 121 | MSG("Session %s destroyed", session->name); |
| 122 | |
| 123 | session_name = get_session_name_quiet(); |
| 124 | if (session_name && !strncmp(session->name, session_name, NAME_MAX)) { |
| 125 | config_destroy_default(); |
| 126 | } |
| 127 | |
| 128 | if (lttng_opt_mi) { |
| 129 | ret = mi_lttng_session(writer, session, 0); |
| 130 | if (ret) { |
| 131 | ret = CMD_ERROR; |
| 132 | goto error; |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | ret = CMD_SUCCESS; |
| 137 | error: |
| 138 | free(session_name); |
| 139 | return ret; |
| 140 | } |
| 141 | |
| 142 | /* |
| 143 | * destroy_all_sessions |
| 144 | * |
| 145 | * Call destroy_sessions for each registered sessions |
| 146 | */ |
| 147 | static int destroy_all_sessions(struct lttng_session *sessions, int count) |
| 148 | { |
| 149 | int i, ret = CMD_SUCCESS; |
| 150 | |
| 151 | if (count == 0) { |
| 152 | MSG("No session found, nothing to do."); |
| 153 | } else if (count < 0) { |
| 154 | ERR("%s", lttng_strerror(ret)); |
| 155 | goto error; |
| 156 | } |
| 157 | |
| 158 | for (i = 0; i < count; i++) { |
| 159 | ret = destroy_session(&sessions[i]); |
| 160 | if (ret < 0) { |
| 161 | goto error; |
| 162 | } |
| 163 | } |
| 164 | error: |
| 165 | return ret; |
| 166 | } |
| 167 | |
| 168 | /* |
| 169 | * The 'destroy <options>' first level command |
| 170 | */ |
| 171 | int cmd_destroy(int argc, const char **argv) |
| 172 | { |
| 173 | int opt; |
| 174 | int ret = CMD_SUCCESS , i, command_ret = CMD_SUCCESS, success = 1; |
| 175 | static poptContext pc; |
| 176 | char *session_name = NULL; |
| 177 | const char *leftover = NULL; |
| 178 | |
| 179 | struct lttng_session *sessions; |
| 180 | int count; |
| 181 | int found; |
| 182 | |
| 183 | pc = poptGetContext(NULL, argc, argv, long_options, 0); |
| 184 | poptReadDefaultConfig(pc, 0); |
| 185 | |
| 186 | while ((opt = poptGetNextOpt(pc)) != -1) { |
| 187 | switch (opt) { |
| 188 | case OPT_HELP: |
| 189 | SHOW_HELP(); |
| 190 | break; |
| 191 | case OPT_LIST_OPTIONS: |
| 192 | list_cmd_options(stdout, long_options); |
| 193 | break; |
| 194 | default: |
| 195 | ret = CMD_UNDEFINED; |
| 196 | break; |
| 197 | } |
| 198 | goto end; |
| 199 | } |
| 200 | |
| 201 | /* Mi preparation */ |
| 202 | if (lttng_opt_mi) { |
| 203 | writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi); |
| 204 | if (!writer) { |
| 205 | ret = -LTTNG_ERR_NOMEM; |
| 206 | goto end; |
| 207 | } |
| 208 | |
| 209 | /* Open command element */ |
| 210 | ret = mi_lttng_writer_command_open(writer, |
| 211 | mi_lttng_element_command_destroy); |
| 212 | if (ret) { |
| 213 | ret = CMD_ERROR; |
| 214 | goto end; |
| 215 | } |
| 216 | |
| 217 | /* Open output element */ |
| 218 | ret = mi_lttng_writer_open_element(writer, |
| 219 | mi_lttng_element_command_output); |
| 220 | if (ret) { |
| 221 | ret = CMD_ERROR; |
| 222 | goto end; |
| 223 | } |
| 224 | |
| 225 | /* For validation and semantic purpose we open a sessions element */ |
| 226 | ret = mi_lttng_sessions_open(writer); |
| 227 | if (ret) { |
| 228 | ret = CMD_ERROR; |
| 229 | goto end; |
| 230 | } |
| 231 | } |
| 232 | |
| 233 | /* Recuperate all sessions for further operation */ |
| 234 | count = lttng_list_sessions(&sessions); |
| 235 | if (count < 0) { |
| 236 | ERR("%s", lttng_strerror(count)); |
| 237 | command_ret = CMD_ERROR; |
| 238 | success = 0; |
| 239 | goto mi_closing; |
| 240 | } |
| 241 | |
| 242 | /* Ignore session name in case all sessions are to be destroyed */ |
| 243 | if (opt_destroy_all) { |
| 244 | command_ret = destroy_all_sessions(sessions, count); |
| 245 | if (command_ret) { |
| 246 | success = 0; |
| 247 | } |
| 248 | } else { |
| 249 | opt_session_name = (char *) poptGetArg(pc); |
| 250 | |
| 251 | if (!opt_session_name) { |
| 252 | /* No session name specified, lookup default */ |
| 253 | session_name = get_session_name(); |
| 254 | if (session_name == NULL) { |
| 255 | command_ret = CMD_ERROR; |
| 256 | success = 0; |
| 257 | goto mi_closing; |
| 258 | } |
| 259 | } else { |
| 260 | session_name = opt_session_name; |
| 261 | } |
| 262 | |
| 263 | /* Find the corresponding lttng_session struct */ |
| 264 | found = 0; |
| 265 | for (i = 0; i < count; i++) { |
| 266 | if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) { |
| 267 | found = 1; |
| 268 | command_ret = destroy_session(&sessions[i]); |
| 269 | if (command_ret) { |
| 270 | success = 0; |
| 271 | } |
| 272 | |
| 273 | } |
| 274 | } |
| 275 | |
| 276 | if (!found) { |
| 277 | ERR("Session name %s not found", session_name); |
| 278 | command_ret = LTTNG_ERR_SESS_NOT_FOUND; |
| 279 | success = 0; |
| 280 | goto mi_closing; |
| 281 | } |
| 282 | } |
| 283 | |
| 284 | leftover = poptGetArg(pc); |
| 285 | if (leftover) { |
| 286 | ERR("Unknown argument: %s", leftover); |
| 287 | ret = CMD_ERROR; |
| 288 | success = 0; |
| 289 | goto mi_closing; |
| 290 | } |
| 291 | |
| 292 | mi_closing: |
| 293 | /* Mi closing */ |
| 294 | if (lttng_opt_mi) { |
| 295 | /* Close sessions and output element element */ |
| 296 | ret = mi_lttng_close_multi_element(writer, 2); |
| 297 | if (ret) { |
| 298 | ret = CMD_ERROR; |
| 299 | goto end; |
| 300 | } |
| 301 | |
| 302 | /* Success ? */ |
| 303 | ret = mi_lttng_writer_write_element_bool(writer, |
| 304 | mi_lttng_element_command_success, success); |
| 305 | if (ret) { |
| 306 | ret = CMD_ERROR; |
| 307 | goto end; |
| 308 | } |
| 309 | |
| 310 | /* Command element close */ |
| 311 | ret = mi_lttng_writer_command_close(writer); |
| 312 | if (ret) { |
| 313 | ret = CMD_ERROR; |
| 314 | goto end; |
| 315 | } |
| 316 | } |
| 317 | end: |
| 318 | /* Mi clean-up */ |
| 319 | if (writer && mi_lttng_writer_destroy(writer)) { |
| 320 | /* Preserve original error code */ |
| 321 | ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL; |
| 322 | } |
| 323 | |
| 324 | if (opt_session_name == NULL) { |
| 325 | free(session_name); |
| 326 | } |
| 327 | |
| 328 | /* Overwrite ret if an error occurred during destroy_session/all */ |
| 329 | ret = command_ret ? command_ret : ret; |
| 330 | |
| 331 | poptFreeContext(pc); |
| 332 | return ret; |
| 333 | } |