src/bin/lttng/commands/disable_events.c

   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 _GNU_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 <assert.h>
  27
  28 #include <common/mi-lttng.h>
  29
  30 #include "../command.h"
  31
  32 static char *opt_event_list;
  33 static int opt_kernel;
  34 static char *opt_channel_name;
  35 static char *opt_session_name;
  36 static int opt_userspace;
  37 static int opt_disable_all;
  38 static int opt_jul;
  39 static int opt_log4j;
  40 static int opt_event_type;
  41 #if 0
  42 /* Not implemented yet */
  43 static char *opt_cmd_name;
  44 static pid_t opt_pid;
  45 #endif
  46
  47 enum {
  48         OPT_HELP = 1,
  49         OPT_USERSPACE,
  50         OPT_SYSCALL,
  51         OPT_LIST_OPTIONS,
  52 };
  53
  54 static struct lttng_handle *handle;
  55 static struct mi_writer *writer;
  56
  57 static struct poptOption long_options[] = {
  58         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  59         {"help",           'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
  60         {"session",        's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
  61         {"all-events",     'a', POPT_ARG_VAL, &opt_disable_all, 1, 0, 0},
  62         {"channel",        'c', POPT_ARG_STRING, &opt_channel_name, 0, 0, 0},
  63         {"jul",            'j', POPT_ARG_VAL, &opt_jul, 1, 0, 0},
  64         {"log4j",          'l', POPT_ARG_VAL, &opt_log4j, 1, 0, 0},
  65         {"kernel",         'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
  66         {"syscall",        0,   POPT_ARG_NONE, 0, OPT_SYSCALL, 0, 0},
  67 #if 0
  68         /* Not implemented yet */
  69         {"userspace",      'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, &opt_cmd_name, OPT_USERSPACE, 0, 0},
  70         {"pid",            'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
  71 #else
  72         {"userspace",      'u', POPT_ARG_NONE, 0, OPT_USERSPACE, 0, 0},
  73 #endif
  74         {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
  75         {0, 0, 0, 0, 0, 0, 0}
  76 };
  77
  78 /*
  79  * usage
  80  */
  81 static void usage(FILE *ofp)
  82 {
  83         fprintf(ofp, "usage: lttng disable-event NAME[,NAME2,...] (-k | -u) [OPTIONS]\n");
  84         fprintf(ofp, "\n");
  85         fprintf(ofp, "Options:\n");
  86         fprintf(ofp, "  -h, --help               Show this help\n");
  87         fprintf(ofp, "      --list-options       Simple listing of options\n");
  88         fprintf(ofp, "  -s, --session NAME       Apply to session name\n");
  89         fprintf(ofp, "  -c, --channel NAME       Apply to this channel\n");
  90         fprintf(ofp, "  -a, --all-events         Disable all tracepoints\n");
  91         fprintf(ofp, "  -k, --kernel             Apply for the kernel tracer\n");
  92         fprintf(ofp, "  -u, --userspace          Apply to the user-space tracer\n");
  93         fprintf(ofp, "  -j, --jul                Apply for Java application using JUL\n");
  94         fprintf(ofp, "  -l, --log4j              Apply to Java application using LOG4j\n");
  95         fprintf(ofp, "\n");
  96         fprintf(ofp, "Event options:\n");
  97         fprintf(ofp, "      --syscall            System call event\n");
  98         fprintf(ofp, "\n");
  99 }
 100
 101 static
 102 const char *print_channel_name(const char *name)
 103 {
 104         return name ? : DEFAULT_CHANNEL_NAME;
 105 }
 106
 107 static
 108 const char *print_raw_channel_name(const char *name)
 109 {
 110         return name ? : "<default>";
 111 }
 112
 113 /* Mi print a partial event.
 114  * enabled is 0 or 1
 115  * success is 0 or 1
 116  */
 117 static int mi_print_event(char *event_name, int enabled, int success)
 118 {
 119         int ret;
 120
 121         assert(writer);
 122         assert(event_name);
 123
 124         /* Open event element */
 125         ret = mi_lttng_writer_open_element(writer, config_element_event);
 126         if (ret) {
 127                 goto end;
 128         }
 129
 130         /* Print the name of event */
 131         ret = mi_lttng_writer_write_element_string(writer,
 132                         config_element_name, event_name);
 133         if (ret) {
 134                 goto end;
 135         }
 136
 137         /* Print enabled ? */
 138         ret = mi_lttng_writer_write_element_bool(writer,
 139                         config_element_enabled, enabled);
 140         if (ret) {
 141                 goto end;
 142         }
 143
 144         /* Success ? */
 145         ret = mi_lttng_writer_write_element_bool(writer,
 146                         mi_lttng_element_command_success, success);
 147         if (ret) {
 148                 goto end;
 149         }
 150
 151         /* Close event element */
 152         ret = mi_lttng_writer_close_element(writer);
 153 end:
 154         return ret;
 155 }
 156
 157 /*
 158  *  disable_events
 159  *
 160  *  Disabling event using the lttng API.
 161  */
 162 static int disable_events(char *session_name)
 163 {
 164         int ret = CMD_SUCCESS, warn = 0, command_ret = CMD_SUCCESS;
 165         int enabled = 1, success = 1;
 166         char *event_name, *channel_name = NULL;
 167         struct lttng_domain dom;
 168         struct lttng_event event;
 169
 170         memset(&dom, 0, sizeof(dom));
 171
 172         /* Create lttng domain */
 173         if (opt_kernel) {
 174                 dom.type = LTTNG_DOMAIN_KERNEL;
 175         } else if (opt_userspace) {
 176                 dom.type = LTTNG_DOMAIN_UST;
 177         } else if (opt_jul) {
 178                 dom.type = LTTNG_DOMAIN_JUL;
 179         } else if (opt_log4j) {
 180                 dom.type = LTTNG_DOMAIN_LOG4J;
 181         } else {
 182                 print_missing_domain();
 183                 ret = CMD_ERROR;
 184                 goto error;
 185         }
 186
 187         channel_name = opt_channel_name;
 188
 189         handle = lttng_create_handle(session_name, &dom);
 190         if (handle == NULL) {
 191                 ret = -1;
 192                 goto error;
 193         }
 194
 195         /* Mi print the channel and open the events element */
 196         if (lttng_opt_mi) {
 197                 ret = mi_lttng_writer_open_element(writer, config_element_channel);
 198                 if (ret) {
 199                         ret = CMD_ERROR;
 200                         goto end;
 201                 }
 202
 203                 ret = mi_lttng_writer_write_element_string(writer,
 204                                 config_element_name, print_channel_name(channel_name));
 205                 if (ret) {
 206                         ret = CMD_ERROR;
 207                         goto end;
 208                 }
 209
 210                 /* Open events element */
 211                 ret = mi_lttng_writer_open_element(writer, config_element_events);
 212                 if (ret) {
 213                         ret = CMD_ERROR;
 214                         goto end;
 215                 }
 216         }
 217
 218         memset(&event, 0, sizeof(event));
 219         /* Set default loglevel to any/unknown */
 220         event.loglevel = -1;
 221
 222         switch (opt_event_type) {
 223         case LTTNG_EVENT_SYSCALL:
 224                 event.type = LTTNG_EVENT_SYSCALL;
 225                 break;
 226         default:
 227                 event.type = LTTNG_EVENT_ALL;
 228                 break;
 229         }
 230
 231         if (opt_disable_all) {
 232                 command_ret = lttng_disable_event_ext(handle, &event, channel_name, NULL);
 233                 if (command_ret < 0) {
 234                         ERR("%s", lttng_strerror(command_ret));
 235                         enabled = 1;
 236                         success = 0;
 237
 238                 } else {
 239                         enabled = 0;
 240                         success = 1;
 241                         MSG("All %s %s are disabled in channel %s",
 242                                         get_domain_str(dom.type),
 243                                         opt_event_type == LTTNG_EVENT_SYSCALL ? "system calls" : "events",
 244                                         print_channel_name(channel_name));
 245                 }
 246
 247                 if (lttng_opt_mi) {
 248                         ret = mi_print_event("*", enabled, success);
 249                         if (ret) {
 250                                 ret = CMD_ERROR;
 251                                 goto error;
 252                         }
 253                 }
 254         } else {
 255                 /* Strip event list */
 256                 event_name = strtok(opt_event_list, ",");
 257                 while (event_name != NULL) {
 258                         DBG("Disabling event %s", event_name);
 259
 260                         strncpy(event.name, event_name, sizeof(event.name));
 261                         event.name[sizeof(event.name) - 1] = '\0';
 262                         command_ret = lttng_disable_event_ext(handle, &event, channel_name, NULL);
 263                         if (command_ret < 0) {
 264                                 ERR("%s %s: %s (channel %s, session %s)",
 265                                                 opt_event_type == LTTNG_EVENT_SYSCALL ? "System call" : "Event",
 266                                                 event_name,
 267                                                 lttng_strerror(command_ret),
 268                                                 command_ret == -LTTNG_ERR_NEED_CHANNEL_NAME
 269                                                         ? print_raw_channel_name(channel_name)
 270                                                         : print_channel_name(channel_name),
 271                                                 session_name);
 272                                 warn = 1;
 273                                 success = 0;
 274                                 /*
 275                                  * If an error occurred we assume that the event is still
 276                                  * enabled.
 277                                  */
 278                                 enabled = 1;
 279                         } else {
 280                                 MSG("%s %s %s disabled in channel %s for session %s",
 281                                                 get_domain_str(dom.type),
 282                                                 opt_event_type == LTTNG_EVENT_SYSCALL ? "system call" : "event",
 283                                                 event_name,
 284                                                 print_channel_name(channel_name),
 285                                                 session_name);
 286                                 success = 1;
 287                                 enabled = 0;
 288                         }
 289
 290                         if (lttng_opt_mi) {
 291                                 ret = mi_print_event(event_name, enabled, success);
 292                                 if (ret) {
 293                                         ret = CMD_ERROR;
 294                                         goto error;
 295                                 }
 296                         }
 297
 298                         /* Next event */
 299                         event_name = strtok(NULL, ",");
 300                 }
 301         }
 302
 303 end:
 304         if (lttng_opt_mi) {
 305                 /* Close events element and channel element */
 306                 ret = mi_lttng_close_multi_element(writer, 2);
 307                 if (ret) {
 308                         ret = CMD_ERROR;
 309                 }
 310         }
 311 error:
 312         /* if there is already an error preserve it */
 313         if (warn && !ret) {
 314                 ret = CMD_WARNING;
 315         }
 316
 317         /* Overwrite ret if an error occurred */
 318         ret = command_ret ? command_ret : ret;
 319
 320         lttng_destroy_handle(handle);
 321         return ret;
 322 }
 323
 324 /*
 325  *  cmd_disable_events
 326  *
 327  *  Disable event to trace session
 328  */
 329 int cmd_disable_events(int argc, const char **argv)
 330 {
 331         int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1;
 332         static poptContext pc;
 333         char *session_name = NULL;
 334         int event_type = -1;
 335
 336         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 337         poptReadDefaultConfig(pc, 0);
 338
 339         /* Default event type */
 340         opt_event_type = LTTNG_EVENT_ALL;
 341
 342         while ((opt = poptGetNextOpt(pc)) != -1) {
 343                 switch (opt) {
 344                 case OPT_HELP:
 345                         usage(stdout);
 346                         goto end;
 347                 case OPT_USERSPACE:
 348                         opt_userspace = 1;
 349                         break;
 350                 case OPT_SYSCALL:
 351                         opt_event_type = LTTNG_EVENT_SYSCALL;
 352                         break;
 353                 case OPT_LIST_OPTIONS:
 354                         list_cmd_options(stdout, long_options);
 355                         goto end;
 356                 default:
 357                         usage(stderr);
 358                         ret = CMD_UNDEFINED;
 359                         goto end;
 360                 }
 361
 362                 /* Validate event type. Multiple event type are not supported. */
 363                 if (event_type == -1) {
 364                         event_type = opt_event_type;
 365                 } else {
 366                         if (event_type != opt_event_type) {
 367                                 ERR("Multiple event type not supported.");
 368                                 ret = CMD_ERROR;
 369                                 goto end;
 370                         }
 371                 }
 372         }
 373
 374         opt_event_list = (char*) poptGetArg(pc);
 375         if (opt_event_list == NULL && opt_disable_all == 0) {
 376                 ERR("Missing event name(s).\n");
 377                 usage(stderr);
 378                 ret = CMD_ERROR;
 379                 goto end;
 380         }
 381
 382         if (!opt_session_name) {
 383                 session_name = get_session_name();
 384                 if (session_name == NULL) {
 385                         ret = CMD_ERROR;
 386                         goto end;
 387                 }
 388         } else {
 389                 session_name = opt_session_name;
 390         }
 391
 392         /* Mi check */
 393         if (lttng_opt_mi) {
 394                 writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
 395                 if (!writer) {
 396                         ret = -LTTNG_ERR_NOMEM;
 397                         goto end;
 398                 }
 399
 400                 /* Open command element */
 401                 ret = mi_lttng_writer_command_open(writer,
 402                                 mi_lttng_element_command_disable_event);
 403                 if (ret) {
 404                         ret = CMD_ERROR;
 405                         goto end;
 406                 }
 407
 408                 /* Open output element */
 409                 ret = mi_lttng_writer_open_element(writer,
 410                                 mi_lttng_element_command_output);
 411                 if (ret) {
 412                         ret = CMD_ERROR;
 413                         goto end;
 414                 }
 415         }
 416
 417         command_ret = disable_events(session_name);
 418         if (command_ret) {
 419                 success = 0;
 420         }
 421
 422         /* Mi closing */
 423         if (lttng_opt_mi) {
 424                 /* Close  output element */
 425                 ret = mi_lttng_writer_close_element(writer);
 426                 if (ret) {
 427                         ret = CMD_ERROR;
 428                         goto end;
 429                 }
 430
 431                 ret = mi_lttng_writer_write_element_bool(writer,
 432                                 mi_lttng_element_command_success, success);
 433                 if (ret) {
 434                         ret = CMD_ERROR;
 435                         goto end;
 436                 }
 437
 438                 /* Command element close */
 439                 ret = mi_lttng_writer_command_close(writer);
 440                 if (ret) {
 441                         ret = CMD_ERROR;
 442                         goto end;
 443                 }
 444         }
 445
 446 end:
 447         if (!opt_session_name && session_name) {
 448                 free(session_name);
 449         }
 450
 451         /* Mi clean-up */
 452         if (writer && mi_lttng_writer_destroy(writer)) {
 453                 /* Preserve original error code */
 454                 ret = ret ? ret : LTTNG_ERR_MI_IO_FAIL;
 455         }
 456
 457         /* Overwrite ret if an error occured in disable_events */
 458         ret = command_ret ? command_ret : ret;
 459
 460         poptFreeContext(pc);
 461         return ret;
 462 }