src/bin/lttng/commands/enable_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 <inttypes.h>
  27 #include <ctype.h>
  28
  29 #include "../command.h"
  30
  31 static char *opt_event_list;
  32 static int opt_event_type;
  33 static const char *opt_loglevel;
  34 static int opt_loglevel_type;
  35 static int opt_kernel;
  36 static char *opt_session_name;
  37 static int opt_userspace;
  38 static int opt_enable_all;
  39 static char *opt_probe;
  40 static char *opt_function;
  41 static char *opt_function_entry_symbol;
  42 static char *opt_channel_name;
  43 #if 0
  44 /* Not implemented yet */
  45 static char *opt_cmd_name;
  46 static pid_t opt_pid;
  47 #endif
  48
  49 enum {
  50         OPT_HELP = 1,
  51         OPT_TRACEPOINT,
  52         OPT_PROBE,
  53         OPT_FUNCTION,
  54         OPT_FUNCTION_ENTRY,
  55         OPT_SYSCALL,
  56         OPT_USERSPACE,
  57         OPT_LOGLEVEL,
  58         OPT_LOGLEVEL_ONLY,
  59         OPT_LIST_OPTIONS,
  60 };
  61
  62 static struct lttng_handle *handle;
  63
  64 static struct poptOption long_options[] = {
  65         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  66         {"help",           'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
  67         {"session",        's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
  68         {"all",            'a', POPT_ARG_VAL, &opt_enable_all, 1, 0, 0},
  69         {"channel",        'c', POPT_ARG_STRING, &opt_channel_name, 0, 0, 0},
  70         {"kernel",         'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
  71 #if 0
  72         /* Not implemented yet */
  73         {"userspace",      'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, &opt_cmd_name, OPT_USERSPACE, 0, 0},
  74         {"pid",            'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
  75 #else
  76         {"userspace",      'u', POPT_ARG_NONE, 0, OPT_USERSPACE, 0, 0},
  77 #endif
  78         {"tracepoint",     0,   POPT_ARG_NONE, 0, OPT_TRACEPOINT, 0, 0},
  79         {"probe",          0,   POPT_ARG_STRING, &opt_probe, OPT_PROBE, 0, 0},
  80         {"function",       0,   POPT_ARG_STRING, &opt_function, OPT_FUNCTION, 0, 0},
  81 #if 0
  82         /*
  83          * Currently removed from lttng kernel tracer. Removed from
  84          * lttng UI to discourage its use.
  85          */
  86         {"function:entry", 0,   POPT_ARG_STRING, &opt_function_entry_symbol, OPT_FUNCTION_ENTRY, 0, 0},
  87 #endif
  88         {"syscall",        0,   POPT_ARG_NONE, 0, OPT_SYSCALL, 0, 0},
  89         {"loglevel",       0,     POPT_ARG_STRING, 0, OPT_LOGLEVEL, 0, 0},
  90         {"loglevel-only",  0,     POPT_ARG_STRING, 0, OPT_LOGLEVEL_ONLY, 0, 0},
  91         {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
  92         {0, 0, 0, 0, 0, 0, 0}
  93 };
  94
  95 /*
  96  * usage
  97  */
  98 static void usage(FILE *ofp)
  99 {
 100         fprintf(ofp, "usage: lttng enable-event NAME[,NAME2,...] [options] [event_options]\n");
 101         fprintf(ofp, "\n");
 102         fprintf(ofp, "  -h, --help               Show this help\n");
 103         fprintf(ofp, "      --list-options       Simple listing of options\n");
 104         fprintf(ofp, "  -s, --session            Apply to session name\n");
 105         fprintf(ofp, "  -c, --channel            Apply to this channel\n");
 106         fprintf(ofp, "  -a, --all                Enable all tracepoints and syscalls\n");
 107         fprintf(ofp, "  -k, --kernel             Apply for the kernel tracer\n");
 108 #if 0
 109         fprintf(ofp, "  -u, --userspace [CMD]    Apply to the user-space tracer\n");
 110         fprintf(ofp, "                           If no CMD, the domain used is UST global\n");
 111         fprintf(ofp, "                           or else the domain is UST EXEC_NAME\n");
 112         fprintf(ofp, "  -p, --pid PID            If -u, apply to specific PID (domain: UST PID)\n");
 113 #else
 114         fprintf(ofp, "  -u, --userspace          Apply to the user-space tracer\n");
 115 #endif
 116         fprintf(ofp, "\n");
 117         fprintf(ofp, "Event options:\n");
 118         fprintf(ofp, "    --tracepoint           Tracepoint event (default)\n");
 119         fprintf(ofp, "                           - userspace tracer supports wildcards at end of string.\n");
 120         fprintf(ofp, "                             Don't forget to quote to deal with bash expansion.\n");
 121         fprintf(ofp, "                             e.g.:\n");
 122         fprintf(ofp, "                               \"*\"\n");
 123         fprintf(ofp, "                               \"app_component:na*\"\n");
 124         fprintf(ofp, "    --probe [addr | symbol | symbol+offset]\n");
 125         fprintf(ofp, "                           Dynamic probe.\n");
 126         fprintf(ofp, "                           Addr and offset can be octal (0NNN...),\n");
 127         fprintf(ofp, "                           decimal (NNN...) or hexadecimal (0xNNN...)\n");
 128         fprintf(ofp, "    --function [addr | symbol | symbol+offset]\n");
 129         fprintf(ofp, "                           Dynamic function entry/return probe.\n");
 130         fprintf(ofp, "                           Addr and offset can be octal (0NNN...),\n");
 131         fprintf(ofp, "                           decimal (NNN...) or hexadecimal (0xNNN...)\n");
 132 #if 0
 133         fprintf(ofp, "    --function:entry symbol\n");
 134         fprintf(ofp, "                           Function tracer event\n");
 135 #endif
 136         fprintf(ofp, "    --syscall              System call event\n");
 137         fprintf(ofp, "\n");
 138         fprintf(ofp, "    --loglevel name\n");
 139         fprintf(ofp, "                           Tracepoint loglevel range from 0 to loglevel\n");
 140         fprintf(ofp, "    --loglevel-only name\n");
 141         fprintf(ofp, "                           Tracepoint loglevel (only this loglevel)\n");
 142         fprintf(ofp, "\n");
 143         fprintf(ofp, "                           The loglevel or loglevel-only options should be\n");
 144         fprintf(ofp, "                           combined with a tracepoint name or tracepoint\n");
 145         fprintf(ofp, "                           wildcard.\n");
 146         fprintf(ofp, "                           Available loglevels:\n");
 147         fprintf(ofp, "                                              (higher value is more verbose)\n");
 148         fprintf(ofp, "                               TRACE_EMERG          = 0\n");
 149         fprintf(ofp, "                               TRACE_ALERT          = 1\n");
 150         fprintf(ofp, "                               TRACE_CRIT           = 2\n");
 151         fprintf(ofp, "                               TRACE_ERR            = 3\n");
 152         fprintf(ofp, "                               TRACE_WARNING        = 4\n");
 153         fprintf(ofp, "                               TRACE_NOTICE         = 5\n");
 154         fprintf(ofp, "                               TRACE_INFO           = 6\n");
 155         fprintf(ofp, "                               TRACE_DEBUG_SYSTEM   = 7\n");
 156         fprintf(ofp, "                               TRACE_DEBUG_PROGRAM  = 8\n");
 157         fprintf(ofp, "                               TRACE_DEBUG_PROCESS  = 9\n");
 158         fprintf(ofp, "                               TRACE_DEBUG_MODULE   = 10\n");
 159         fprintf(ofp, "                               TRACE_DEBUG_UNIT     = 11\n");
 160         fprintf(ofp, "                               TRACE_DEBUG_FUNCTION = 12\n");
 161         fprintf(ofp, "                               TRACE_DEBUG_LINE     = 13\n");
 162         fprintf(ofp, "                               TRACE_DEBUG          = 14\n");
 163         fprintf(ofp, "                               (shortcuts such as \"system\" are allowed)\n");
 164         fprintf(ofp, "\n");
 165 }
 166
 167 /*
 168  * Parse probe options.
 169  */
 170 static int parse_probe_opts(struct lttng_event *ev, char *opt)
 171 {
 172         int ret;
 173         char s_hex[19];
 174         char name[LTTNG_SYMBOL_NAME_LEN];
 175
 176         if (opt == NULL) {
 177                 ret = -1;
 178                 goto end;
 179         }
 180
 181         /* Check for symbol+offset */
 182         ret = sscanf(opt, "%[^'+']+%s", name, s_hex);
 183         if (ret == 2) {
 184                 strncpy(ev->attr.probe.symbol_name, name, LTTNG_SYMBOL_NAME_LEN);
 185                 ev->attr.probe.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 186                 DBG("probe symbol %s", ev->attr.probe.symbol_name);
 187                 if (strlen(s_hex) == 0) {
 188                         ERR("Invalid probe offset %s", s_hex);
 189                         ret = -1;
 190                         goto end;
 191                 }
 192                 ev->attr.probe.offset = strtoul(s_hex, NULL, 0);
 193                 DBG("probe offset %" PRIu64, ev->attr.probe.offset);
 194                 ev->attr.probe.addr = 0;
 195                 goto end;
 196         }
 197
 198         /* Check for symbol */
 199         if (isalpha(name[0])) {
 200                 ret = sscanf(opt, "%s", name);
 201                 if (ret == 1) {
 202                         strncpy(ev->attr.probe.symbol_name, name, LTTNG_SYMBOL_NAME_LEN);
 203                         ev->attr.probe.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 204                         DBG("probe symbol %s", ev->attr.probe.symbol_name);
 205                         ev->attr.probe.offset = 0;
 206                         DBG("probe offset %" PRIu64, ev->attr.probe.offset);
 207                         ev->attr.probe.addr = 0;
 208                         goto end;
 209                 }
 210         }
 211
 212         /* Check for address */
 213         ret = sscanf(opt, "%s", s_hex);
 214         if (ret > 0) {
 215                 if (strlen(s_hex) == 0) {
 216                         ERR("Invalid probe address %s", s_hex);
 217                         ret = -1;
 218                         goto end;
 219                 }
 220                 ev->attr.probe.addr = strtoul(s_hex, NULL, 0);
 221                 DBG("probe addr %" PRIu64, ev->attr.probe.addr);
 222                 ev->attr.probe.offset = 0;
 223                 memset(ev->attr.probe.symbol_name, 0, LTTNG_SYMBOL_NAME_LEN);
 224                 goto end;
 225         }
 226
 227         /* No match */
 228         ret = -1;
 229
 230 end:
 231         return ret;
 232 }
 233
 234 /*
 235  * Maps loglevel from string to value
 236  */
 237 static
 238 int loglevel_str_to_value(const char *inputstr)
 239 {
 240         int i = 0;
 241         char str[LTTNG_SYMBOL_NAME_LEN];
 242
 243         while (inputstr[i] != '\0' && i < LTTNG_SYMBOL_NAME_LEN) {
 244                 str[i] = toupper(inputstr[i]);
 245                 i++;
 246         }
 247         str[i] = '\0';
 248         if (!strcmp(str, "TRACE_EMERG") || !strcmp(str, "EMERG")) {
 249                 return LTTNG_LOGLEVEL_EMERG;
 250         } else if (!strcmp(str, "TRACE_ALERT") || !strcmp(str, "ALERT")) {
 251                 return LTTNG_LOGLEVEL_ALERT;
 252         } else if (!strcmp(str, "TRACE_CRIT") || !strcmp(str, "CRIT")) {
 253                 return LTTNG_LOGLEVEL_CRIT;
 254         } else if (!strcmp(str, "TRACE_ERR") || !strcmp(str, "ERR")) {
 255                 return LTTNG_LOGLEVEL_ERR;
 256         } else if (!strcmp(str, "TRACE_WARNING") || !strcmp(str, "WARNING")) {
 257                 return LTTNG_LOGLEVEL_WARNING;
 258         } else if (!strcmp(str, "TRACE_NOTICE") || !strcmp(str, "NOTICE")) {
 259                 return LTTNG_LOGLEVEL_NOTICE;
 260         } else if (!strcmp(str, "TRACE_INFO") || !strcmp(str, "INFO")) {
 261                 return LTTNG_LOGLEVEL_INFO;
 262         } else if (!strcmp(str, "TRACE_DEBUG_SYSTEM") || !strcmp(str, "DEBUG_SYSTEM") || !strcmp(str, "SYSTEM")) {
 263                 return LTTNG_LOGLEVEL_DEBUG_SYSTEM;
 264         } else if (!strcmp(str, "TRACE_DEBUG_PROGRAM") || !strcmp(str, "DEBUG_PROGRAM") || !strcmp(str, "PROGRAM")) {
 265                 return LTTNG_LOGLEVEL_DEBUG_PROGRAM;
 266         } else if (!strcmp(str, "TRACE_DEBUG_PROCESS") || !strcmp(str, "DEBUG_PROCESS") || !strcmp(str, "PROCESS")) {
 267                 return LTTNG_LOGLEVEL_DEBUG_PROCESS;
 268         } else if (!strcmp(str, "TRACE_DEBUG_MODULE") || !strcmp(str, "DEBUG_MODULE") || !strcmp(str, "MODULE")) {
 269                 return LTTNG_LOGLEVEL_DEBUG_MODULE;
 270         } else if (!strcmp(str, "TRACE_DEBUG_UNIT") || !strcmp(str, "DEBUG_UNIT") || !strcmp(str, "UNIT")) {
 271                 return LTTNG_LOGLEVEL_DEBUG_UNIT;
 272         } else if (!strcmp(str, "TRACE_DEBUG_FUNCTION") || !strcmp(str, "DEBUG_FUNCTION") || !strcmp(str, "FUNCTION")) {
 273                 return LTTNG_LOGLEVEL_DEBUG_FUNCTION;
 274         } else if (!strcmp(str, "TRACE_DEBUG_LINE") || !strcmp(str, "DEBUG_LINE") || !strcmp(str, "LINE")) {
 275                 return LTTNG_LOGLEVEL_DEBUG_LINE;
 276         } else if (!strcmp(str, "TRACE_DEBUG") || !strcmp(str, "DEBUG")) {
 277                 return LTTNG_LOGLEVEL_DEBUG;
 278         } else {
 279                 return -1;
 280         }
 281 }
 282
 283 /*
 284  * Enabling event using the lttng API.
 285  */
 286 static int enable_events(char *session_name)
 287 {
 288         int err, ret = CMD_SUCCESS, warn = 0;
 289         char *event_name, *channel_name = NULL;
 290         struct lttng_event ev;
 291         struct lttng_domain dom;
 292
 293         memset(&ev, 0, sizeof(ev));
 294         memset(&dom, 0, sizeof(dom));
 295
 296         /* Create lttng domain */
 297         if (opt_kernel) {
 298                 dom.type = LTTNG_DOMAIN_KERNEL;
 299         } else if (opt_userspace) {
 300                 dom.type = LTTNG_DOMAIN_UST;
 301         } else {
 302                 ERR("Please specify a tracer (-k/--kernel or -u/--userspace)");
 303                 ret = CMD_ERROR;
 304                 goto error;
 305         }
 306
 307         if (opt_channel_name == NULL) {
 308                 err = asprintf(&channel_name, DEFAULT_CHANNEL_NAME);
 309                 if (err < 0) {
 310                         ret = CMD_FATAL;
 311                         goto error;
 312                 }
 313         } else {
 314                 channel_name = opt_channel_name;
 315         }
 316
 317         handle = lttng_create_handle(session_name, &dom);
 318         if (handle == NULL) {
 319                 ret = -1;
 320                 goto error;
 321         }
 322
 323         if (opt_enable_all) {
 324                 /* Default setup for enable all */
 325                 if (opt_kernel) {
 326                         ev.type = opt_event_type;
 327                         ev.name[0] = '\0';
 328                         /* kernel loglevels not implemented */
 329                         ev.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
 330                 } else {
 331                         ev.type = LTTNG_EVENT_TRACEPOINT;
 332                         strcpy(ev.name, "*");
 333                         ev.loglevel_type = opt_loglevel_type;
 334                         if (opt_loglevel) {
 335                                 ev.loglevel = loglevel_str_to_value(opt_loglevel);
 336                                 if (ev.loglevel == -1) {
 337                                         ERR("Unknown loglevel %s", opt_loglevel);
 338                                         ret = -1;
 339                                         goto error;
 340                                 }
 341                         } else {
 342                                 ev.loglevel = -1;
 343                         }
 344                 }
 345
 346                 ret = lttng_enable_event(handle, &ev, channel_name);
 347                 if (ret < 0) {
 348                         goto error;
 349                 }
 350
 351                 switch (opt_event_type) {
 352                 case LTTNG_EVENT_TRACEPOINT:
 353                         if (opt_loglevel) {
 354                                 MSG("All %s tracepoints are enabled in channel %s for loglevel %s",
 355                                         opt_kernel ? "kernel" : "UST", channel_name,
 356                                         opt_loglevel);
 357                         } else {
 358                                 MSG("All %s tracepoints are enabled in channel %s",
 359                                         opt_kernel ? "kernel" : "UST", channel_name);
 360
 361                         }
 362                         break;
 363                 case LTTNG_EVENT_SYSCALL:
 364                         if (opt_kernel) {
 365                                 MSG("All kernel system calls are enabled in channel %s",
 366                                                 channel_name);
 367                         }
 368                         break;
 369                 case LTTNG_EVENT_ALL:
 370                         if (opt_loglevel) {
 371                                 MSG("All %s events are enabled in channel %s for loglevel %s",
 372                                         opt_kernel ? "kernel" : "UST", channel_name,
 373                                         opt_loglevel);
 374                         } else {
 375                                 MSG("All %s events are enabled in channel %s",
 376                                         opt_kernel ? "kernel" : "UST", channel_name);
 377                         }
 378                         break;
 379                 default:
 380                         /*
 381                          * We should not be here since lttng_enable_event should have
 382                          * failed on the event type.
 383                          */
 384                         goto error;
 385                 }
 386                 goto end;
 387         }
 388
 389         /* Strip event list */
 390         event_name = strtok(opt_event_list, ",");
 391         while (event_name != NULL) {
 392                 /* Copy name and type of the event */
 393                 strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
 394                 ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 395                 ev.type = opt_event_type;
 396
 397                 /* Kernel tracer action */
 398                 if (opt_kernel) {
 399                         DBG("Enabling kernel event %s for channel %s",
 400                                         event_name, channel_name);
 401
 402                         switch (opt_event_type) {
 403                         case LTTNG_EVENT_ALL:   /* Default behavior is tracepoint */
 404                                 ev.type = LTTNG_EVENT_TRACEPOINT;
 405                                 /* Fall-through */
 406                         case LTTNG_EVENT_TRACEPOINT:
 407                                 break;
 408                         case LTTNG_EVENT_PROBE:
 409                                 ret = parse_probe_opts(&ev, opt_probe);
 410                                 if (ret < 0) {
 411                                         ERR("Unable to parse probe options");
 412                                         ret = 0;
 413                                         goto error;
 414                                 }
 415                                 break;
 416                         case LTTNG_EVENT_FUNCTION:
 417                                 ret = parse_probe_opts(&ev, opt_function);
 418                                 if (ret < 0) {
 419                                         ERR("Unable to parse function probe options");
 420                                         ret = 0;
 421                                         goto error;
 422                                 }
 423                                 break;
 424                         case LTTNG_EVENT_FUNCTION_ENTRY:
 425                                 strncpy(ev.attr.ftrace.symbol_name, opt_function_entry_symbol,
 426                                                 LTTNG_SYMBOL_NAME_LEN);
 427                                 ev.attr.ftrace.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 428                                 break;
 429                         case LTTNG_EVENT_SYSCALL:
 430                                 MSG("per-syscall selection not supported yet. Use \"-a\" "
 431                                                 "for all syscalls.");
 432                         default:
 433                                 ret = CMD_UNDEFINED;
 434                                 goto error;
 435                         }
 436
 437                         if (opt_loglevel) {
 438                                 MSG("Kernel loglevels are not supported.");
 439                                 ret = CMD_UNDEFINED;
 440                                 goto error;
 441                         }
 442
 443                         /* kernel loglevels not implemented */
 444                         ev.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
 445                 } else if (opt_userspace) {             /* User-space tracer action */
 446 #if 0
 447                         if (opt_cmd_name != NULL || opt_pid) {
 448                                 MSG("Only supporting tracing all UST processes (-u) for now.");
 449                                 ret = CMD_UNDEFINED;
 450                                 goto error;
 451                         }
 452 #endif
 453
 454                         DBG("Enabling UST event %s for channel %s, loglevel %s", event_name,
 455                                         channel_name, opt_loglevel ? : "<all>");
 456
 457                         switch (opt_event_type) {
 458                         case LTTNG_EVENT_ALL:   /* Default behavior is tracepoint */
 459                                 /* Fall-through */
 460                         case LTTNG_EVENT_TRACEPOINT:
 461                                 /* Copy name and type of the event */
 462                                 ev.type = LTTNG_EVENT_TRACEPOINT;
 463                                 strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
 464                                 ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 465                                 break;
 466                         case LTTNG_EVENT_PROBE:
 467                         case LTTNG_EVENT_FUNCTION:
 468                         case LTTNG_EVENT_FUNCTION_ENTRY:
 469                         case LTTNG_EVENT_SYSCALL:
 470                         default:
 471                                 ERR("Event type not available for user-space tracing");
 472                                 ret = CMD_UNDEFINED;
 473                                 goto error;
 474                         }
 475
 476                         ev.loglevel_type = opt_loglevel_type;
 477                         if (opt_loglevel) {
 478                                 ev.loglevel = loglevel_str_to_value(opt_loglevel);
 479                                 if (ev.loglevel == -1) {
 480                                         ERR("Unknown loglevel %s", opt_loglevel);
 481                                         ret = -1;
 482                                         goto error;
 483                                 }
 484                         } else {
 485                                 ev.loglevel = -1;
 486                         }
 487                 } else {
 488                         ERR("Please specify a tracer (-k/--kernel or -u/--userspace)");
 489                         ret = CMD_ERROR;
 490                         goto error;
 491                 }
 492
 493                 ret = lttng_enable_event(handle, &ev, channel_name);
 494                 if (ret < 0) {
 495                         ERR("Event %s: %s (channel %s, session %s)", event_name,
 496                                         lttng_strerror(ret), channel_name, session_name);
 497                         warn = 1;
 498                 } else {
 499                         MSG("%s event %s created in channel %s",
 500                                         opt_kernel ? "kernel": "UST", event_name, channel_name);
 501                 }
 502
 503                 /* Next event */
 504                 event_name = strtok(NULL, ",");
 505         }
 506
 507 end:
 508 error:
 509         if (warn) {
 510                 ret = CMD_WARNING;
 511         }
 512         if (opt_channel_name == NULL) {
 513                 free(channel_name);
 514         }
 515         lttng_destroy_handle(handle);
 516
 517         return ret;
 518 }
 519
 520 /*
 521  * Add event to trace session
 522  */
 523 int cmd_enable_events(int argc, const char **argv)
 524 {
 525         int opt, ret = CMD_SUCCESS;
 526         static poptContext pc;
 527         char *session_name = NULL;
 528
 529         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 530         poptReadDefaultConfig(pc, 0);
 531
 532         /* Default event type */
 533         opt_event_type = LTTNG_EVENT_ALL;
 534
 535         while ((opt = poptGetNextOpt(pc)) != -1) {
 536                 switch (opt) {
 537                 case OPT_HELP:
 538                         usage(stdout);
 539                         goto end;
 540                 case OPT_TRACEPOINT:
 541                         opt_event_type = LTTNG_EVENT_TRACEPOINT;
 542                         break;
 543                 case OPT_PROBE:
 544                         opt_event_type = LTTNG_EVENT_PROBE;
 545                         break;
 546                 case OPT_FUNCTION:
 547                         opt_event_type = LTTNG_EVENT_FUNCTION;
 548                         break;
 549                 case OPT_FUNCTION_ENTRY:
 550                         opt_event_type = LTTNG_EVENT_FUNCTION_ENTRY;
 551                         break;
 552                 case OPT_SYSCALL:
 553                         opt_event_type = LTTNG_EVENT_SYSCALL;
 554                         break;
 555                 case OPT_USERSPACE:
 556                         opt_userspace = 1;
 557                         break;
 558                 case OPT_LOGLEVEL:
 559                         opt_loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
 560                         opt_loglevel = poptGetOptArg(pc);
 561                         break;
 562                 case OPT_LOGLEVEL_ONLY:
 563                         opt_loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
 564                         opt_loglevel = poptGetOptArg(pc);
 565                         break;
 566                 case OPT_LIST_OPTIONS:
 567                         list_cmd_options(stdout, long_options);
 568                         goto end;
 569                 default:
 570                         usage(stderr);
 571                         ret = CMD_UNDEFINED;
 572                         goto end;
 573                 }
 574         }
 575
 576         opt_event_list = (char*) poptGetArg(pc);
 577         if (opt_event_list == NULL && opt_enable_all == 0) {
 578                 ERR("Missing event name(s).\n");
 579                 usage(stderr);
 580                 ret = CMD_ERROR;
 581                 goto end;
 582         }
 583
 584         if (!opt_session_name) {
 585                 session_name = get_session_name();
 586                 if (session_name == NULL) {
 587                         ret = CMD_ERROR;
 588                         goto end;
 589                 }
 590         } else {
 591                 session_name = opt_session_name;
 592         }
 593
 594         ret = enable_events(session_name);
 595
 596 end:
 597         if (opt_session_name == NULL) {
 598                 free(session_name);
 599         }
 600
 601         poptFreeContext(pc);
 602         return ret;
 603 }