| 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 | /* Mi writer */ |
| 39 | static struct mi_writer *writer; |
| 40 | |
| 41 | enum { |
| 42 | OPT_HELP = 1, |
| 43 | OPT_LIST_OPTIONS, |
| 44 | }; |
| 45 | |
| 46 | static struct poptOption long_options[] = { |
| 47 | /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */ |
| 48 | {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0}, |
| 49 | {"all", 'a', POPT_ARG_VAL, &opt_destroy_all, 1, 0, 0}, |
| 50 | {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL}, |
| 51 | {"no-wait", 'n', POPT_ARG_VAL, &opt_no_wait, 1, 0, 0}, |
| 52 | {0, 0, 0, 0, 0, 0, 0} |
| 53 | }; |
| 54 | |
| 55 | /* |
| 56 | * destroy_session |
| 57 | * |
| 58 | * Unregister the provided session to the session daemon. On success, removes |
| 59 | * the default configuration. |
| 60 | */ |
| 61 | static int destroy_session(struct lttng_session *session) |
| 62 | { |
| 63 | int ret; |
| 64 | char *session_name = NULL; |
| 65 | bool session_was_stopped; |
| 66 | |
| 67 | ret = lttng_stop_tracing_no_wait(session->name); |
| 68 | if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) { |
| 69 | ERR("%s", lttng_strerror(ret)); |
| 70 | } |
| 71 | session_was_stopped = ret == -LTTNG_ERR_TRACE_ALREADY_STOPPED; |
| 72 | if (!opt_no_wait) { |
| 73 | bool printed_wait_msg = false; |
| 74 | |
| 75 | do { |
| 76 | ret = lttng_data_pending(session->name); |
| 77 | if (ret < 0) { |
| 78 | /* Return the data available call error. */ |
| 79 | goto error; |
| 80 | } |
| 81 | |
| 82 | /* |
| 83 | * Data sleep time before retrying (in usec). Don't sleep if the call |
| 84 | * returned value indicates availability. |
| 85 | */ |
| 86 | if (ret) { |
| 87 | if (!printed_wait_msg) { |
| 88 | _MSG("Waiting for data availability"); |
| 89 | fflush(stdout); |
| 90 | } |
| 91 | |
| 92 | printed_wait_msg = true; |
| 93 | usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME); |
| 94 | _MSG("."); |
| 95 | fflush(stdout); |
| 96 | } |
| 97 | } while (ret != 0); |
| 98 | if (printed_wait_msg) { |
| 99 | MSG(""); |
| 100 | } |
| 101 | } |
| 102 | if (!session_was_stopped) { |
| 103 | /* |
| 104 | * Don't print the event and packet loss warnings since the user |
| 105 | * already saw them when stopping the trace. |
| 106 | */ |
| 107 | print_session_stats(session->name); |
| 108 | } |
| 109 | |
| 110 | ret = lttng_destroy_session_no_wait(session->name); |
| 111 | if (ret < 0) { |
| 112 | goto error; |
| 113 | } |
| 114 | |
| 115 | MSG("Session %s destroyed", session->name); |
| 116 | |
| 117 | session_name = get_session_name_quiet(); |
| 118 | if (session_name && !strncmp(session->name, session_name, NAME_MAX)) { |
| 119 | config_destroy_default(); |
| 120 | } |
| 121 | |
| 122 | if (lttng_opt_mi) { |
| 123 | ret = mi_lttng_session(writer, session, 0); |
| 124 | if (ret) { |
| 125 | ret = CMD_ERROR; |
| 126 | goto error; |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | ret = CMD_SUCCESS; |
| 131 | error: |
| 132 | free(session_name); |
| 133 | return ret; |
| 134 | } |
| 135 | |
| 136 | /* |
| 137 | * destroy_all_sessions |
| 138 | * |
| 139 | * Call destroy_sessions for each registered sessions |
| 140 | */ |
| 141 | static int destroy_all_sessions(struct lttng_session *sessions, int count) |
| 142 | { |
| 143 | int i, ret = CMD_SUCCESS; |
| 144 | |
| 145 | if (count == 0) { |
| 146 | MSG("No session found, nothing to do."); |
| 147 | } else if (count < 0) { |
| 148 | ERR("%s", lttng_strerror(ret)); |
| 149 | goto error; |
| 150 | } |
| 151 | |
| 152 | for (i = 0; i < count; i++) { |
| 153 | ret = destroy_session(&sessions[i]); |
| 154 | if (ret < 0) { |
| 155 | goto error; |
| 156 | } |
| 157 | } |
| 158 | error: |
| 159 | return ret; |
| 160 | } |
| 161 | |
| 162 | /* |
| 163 | * The 'destroy <options>' first level command |
| 164 | */ |
| 165 | int cmd_destroy(int argc, const char **argv) |
| 166 | { |
| 167 | int opt; |
| 168 | int ret = CMD_SUCCESS , i, command_ret = CMD_SUCCESS, success = 1; |
| 169 | static poptContext pc; |
| 170 | char *session_name = NULL; |
| 171 | |
| 172 | struct lttng_session *sessions; |
| 173 | int count; |
| 174 | int found; |
| 175 | |
| 176 | pc = poptGetContext(NULL, argc, argv, long_options, 0); |
| 177 | poptReadDefaultConfig(pc, 0); |
| 178 | |
| 179 | while ((opt = poptGetNextOpt(pc)) != -1) { |
| 180 | switch (opt) { |
| 181 | case OPT_HELP: |
| 182 | SHOW_HELP(); |
| 183 | break; |
| 184 | case OPT_LIST_OPTIONS: |
| 185 | list_cmd_options(stdout, long_options); |
| 186 | break; |
| 187 | default: |
| 188 | ret = CMD_UNDEFINED; |
| 189 | break; |
| 190 | } |
| 191 | goto end; |
| 192 | } |
| 193 | |
| 194 | /* Mi preparation */ |
| 195 | if (lttng_opt_mi) { |
| 196 | writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi); |
| 197 | if (!writer) { |
| 198 | ret = -LTTNG_ERR_NOMEM; |
| 199 | goto end; |
| 200 | } |
| 201 | |
| 202 | /* Open command element */ |
| 203 | ret = mi_lttng_writer_command_open(writer, |
| 204 | mi_lttng_element_command_destroy); |
| 205 | if (ret) { |
| 206 | ret = CMD_ERROR; |
| 207 | goto end; |
| 208 | } |
| 209 | |
| 210 | /* Open output element */ |
| 211 | ret = mi_lttng_writer_open_element(writer, |
| 212 | mi_lttng_element_command_output); |
| 213 | if (ret) { |
| 214 | ret = CMD_ERROR; |
| 215 | goto end; |
| 216 | } |
| 217 | |
| 218 | /* For validation and semantic purpose we open a sessions element */ |
| 219 | ret = mi_lttng_sessions_open(writer); |
| 220 | if (ret) { |
| 221 | ret = CMD_ERROR; |
| 222 | goto end; |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | /* Recuperate all sessions for further operation */ |
| 227 | count = lttng_list_sessions(&sessions); |
| 228 | if (count < 0) { |
| 229 | command_ret = count; |
| 230 | success = 0; |
| 231 | goto mi_closing; |
| 232 | } |
| 233 | |
| 234 | /* Ignore session name in case all sessions are to be destroyed */ |
| 235 | if (opt_destroy_all) { |
| 236 | command_ret = destroy_all_sessions(sessions, count); |
| 237 | if (command_ret) { |
| 238 | success = 0; |
| 239 | } |
| 240 | } else { |
| 241 | opt_session_name = (char *) poptGetArg(pc); |
| 242 | |
| 243 | if (!opt_session_name) { |
| 244 | /* No session name specified, lookup default */ |
| 245 | session_name = get_session_name(); |
| 246 | if (session_name == NULL) { |
| 247 | command_ret = CMD_ERROR; |
| 248 | success = 0; |
| 249 | goto mi_closing; |
| 250 | } |
| 251 | } else { |
| 252 | session_name = opt_session_name; |
| 253 | } |
| 254 | |
| 255 | /* Find the corresponding lttng_session struct */ |
| 256 | found = 0; |
| 257 | for (i = 0; i < count; i++) { |
| 258 | if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) { |
| 259 | found = 1; |
| 260 | command_ret = destroy_session(&sessions[i]); |
| 261 | if (command_ret) { |
| 262 | success = 0; |
| 263 | } |
| 264 | |
| 265 | } |
| 266 | } |
| 267 | |
| 268 | if (!found) { |
| 269 | ERR("Session name %s not found", session_name); |
| 270 | command_ret = LTTNG_ERR_SESS_NOT_FOUND; |
| 271 | success = 0; |
| 272 | goto mi_closing; |
| 273 | } |
| 274 | } |
| 275 | |
| 276 | mi_closing: |
| 277 | /* Mi closing */ |
| 278 | if (lttng_opt_mi) { |
| 279 | /* Close sessions and output element element */ |
| 280 | ret = mi_lttng_close_multi_element(writer, 2); |
| 281 | if (ret) { |
| 282 | ret = CMD_ERROR; |
| 283 | goto end; |
| 284 | } |
| 285 | |
| 286 | /* Success ? */ |
| 287 | ret = mi_lttng_writer_write_element_bool(writer, |
| 288 | mi_lttng_element_command_success, success); |
| 289 | if (ret) { |
| 290 | ret = CMD_ERROR; |
| 291 | goto end; |
| 292 | } |
| 293 | |
| 294 | /* Command element close */ |
| 295 | ret = mi_lttng_writer_command_close(writer); |
| 296 | if (ret) { |
| 297 | ret = CMD_ERROR; |
| 298 | goto end; |
| 299 | } |
| 300 | } |
| 301 | end: |
| 302 | /* Mi clean-up */ |
| 303 | if (writer && mi_lttng_writer_destroy(writer)) { |
| 304 | /* Preserve original error code */ |
| 305 | ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL; |
| 306 | } |
| 307 | |
| 308 | if (opt_session_name == NULL) { |
| 309 | free(session_name); |
| 310 | } |
| 311 | |
| 312 | /* Overwrite ret if an error occurred during destroy_session/all */ |
| 313 | ret = command_ret ? command_ret : ret; |
| 314 | |
| 315 | poptFreeContext(pc); |
| 316 | return ret; |
| 317 | } |