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 <assert.h>
  20 #include <popt.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <sys/stat.h>
  25 #include <sys/types.h>
  26 #include <unistd.h>
  27 #include <inttypes.h>
  28 #include <ctype.h>
  29
  30 #include "../command.h"
  31 #include <src/common/sessiond-comm/sessiond-comm.h>
  32
  33 #if (LTTNG_SYMBOL_NAME_LEN == 256)
  34 #define LTTNG_SYMBOL_NAME_LEN_SCANF_IS_A_BROKEN_API     "255"
  35 #endif
  36
  37 static char *opt_event_list;
  38 static int opt_event_type;
  39 static const char *opt_loglevel;
  40 static int opt_loglevel_type;
  41 static int opt_kernel;
  42 static char *opt_session_name;
  43 static int opt_userspace;
  44 static int opt_jul;
  45 static int opt_enable_all;
  46 static char *opt_probe;
  47 static char *opt_function;
  48 static char *opt_function_entry_symbol;
  49 static char *opt_channel_name;
  50 static char *opt_filter;
  51 static char *opt_exclude;
  52 #if 0
  53 /* Not implemented yet */
  54 static char *opt_cmd_name;
  55 static pid_t opt_pid;
  56 #endif
  57
  58 enum {
  59         OPT_HELP = 1,
  60         OPT_TRACEPOINT,
  61         OPT_PROBE,
  62         OPT_FUNCTION,
  63         OPT_FUNCTION_ENTRY,
  64         OPT_SYSCALL,
  65         OPT_USERSPACE,
  66         OPT_LOGLEVEL,
  67         OPT_LOGLEVEL_ONLY,
  68         OPT_LIST_OPTIONS,
  69         OPT_FILTER,
  70         OPT_EXCLUDE,
  71 };
  72
  73 static struct lttng_handle *handle;
  74
  75 static struct poptOption long_options[] = {
  76         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  77         {"help",           'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
  78         {"session",        's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
  79         {"all",            'a', POPT_ARG_VAL, &opt_enable_all, 1, 0, 0},
  80         {"channel",        'c', POPT_ARG_STRING, &opt_channel_name, 0, 0, 0},
  81         {"kernel",         'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
  82         {"userspace",      'u', POPT_ARG_NONE, 0, OPT_USERSPACE, 0, 0},
  83         {"jul",            'j', POPT_ARG_VAL, &opt_jul, 1, 0, 0},
  84         {"tracepoint",     0,   POPT_ARG_NONE, 0, OPT_TRACEPOINT, 0, 0},
  85         {"probe",          0,   POPT_ARG_STRING, &opt_probe, OPT_PROBE, 0, 0},
  86         {"function",       0,   POPT_ARG_STRING, &opt_function, OPT_FUNCTION, 0, 0},
  87 #if 0
  88         /*
  89          * Currently removed from lttng kernel tracer. Removed from
  90          * lttng UI to discourage its use.
  91          */
  92         {"function:entry", 0,   POPT_ARG_STRING, &opt_function_entry_symbol, OPT_FUNCTION_ENTRY, 0, 0},
  93 #endif
  94         {"syscall",        0,   POPT_ARG_NONE, 0, OPT_SYSCALL, 0, 0},
  95         {"loglevel",       0,     POPT_ARG_STRING, 0, OPT_LOGLEVEL, 0, 0},
  96         {"loglevel-only",  0,     POPT_ARG_STRING, 0, OPT_LOGLEVEL_ONLY, 0, 0},
  97         {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
  98         {"filter",         'f', POPT_ARG_STRING, &opt_filter, OPT_FILTER, 0, 0},
  99         {"exclude",        'x', POPT_ARG_STRING, &opt_exclude, OPT_EXCLUDE, 0, 0},
 100         {0, 0, 0, 0, 0, 0, 0}
 101 };
 102
 103 /*
 104  * usage
 105  */
 106 static void usage(FILE *ofp)
 107 {
 108         fprintf(ofp, "usage: lttng enable-event NAME[,NAME2,...] [-k|-u] [OPTIONS] \n");
 109         fprintf(ofp, "\n");
 110         fprintf(ofp, "Options:\n");
 111         fprintf(ofp, "  -h, --help               Show this help\n");
 112         fprintf(ofp, "      --list-options       Simple listing of options\n");
 113         fprintf(ofp, "  -s, --session NAME       Apply to session name\n");
 114         fprintf(ofp, "  -c, --channel NAME       Apply to this channel\n");
 115         fprintf(ofp, "  -a, --all                Enable all tracepoints and syscalls\n");
 116         fprintf(ofp, "  -k, --kernel             Apply for the kernel tracer\n");
 117         fprintf(ofp, "  -u, --userspace          Apply to the user-space tracer\n");
 118         fprintf(ofp, "  -j, --jul                Apply for Java application using JUL\n");
 119         fprintf(ofp, "\n");
 120         fprintf(ofp, "Event options:\n");
 121         fprintf(ofp, "    --tracepoint           Tracepoint event (default)\n");
 122         fprintf(ofp, "                           - userspace tracer supports wildcards at end of string.\n");
 123         fprintf(ofp, "                             Don't forget to quote to deal with bash expansion.\n");
 124         fprintf(ofp, "                             e.g.:\n");
 125         fprintf(ofp, "                               \"*\"\n");
 126         fprintf(ofp, "                               \"app_component:na*\"\n");
 127         fprintf(ofp, "    --probe (addr | symbol | symbol+offset)\n");
 128         fprintf(ofp, "                           Dynamic probe.\n");
 129         fprintf(ofp, "                           Addr and offset can be octal (0NNN...),\n");
 130         fprintf(ofp, "                           decimal (NNN...) or hexadecimal (0xNNN...)\n");
 131         fprintf(ofp, "    --function (addr | symbol | symbol+offset)\n");
 132         fprintf(ofp, "                           Dynamic function entry/return probe.\n");
 133         fprintf(ofp, "                           Addr and offset can be octal (0NNN...),\n");
 134         fprintf(ofp, "                           decimal (NNN...) or hexadecimal (0xNNN...)\n");
 135 #if 0
 136         fprintf(ofp, "    --function:entry symbol\n");
 137         fprintf(ofp, "                           Function tracer event\n");
 138 #endif
 139         fprintf(ofp, "    --syscall              System call event\n");
 140         fprintf(ofp, "\n");
 141         fprintf(ofp, "    --loglevel name\n");
 142         fprintf(ofp, "                           Tracepoint loglevel range from 0 to loglevel.\n");
 143         fprintf(ofp, "                           For JUL domain, see the table below for the range values.\n");
 144         fprintf(ofp, "    --loglevel-only name\n");
 145         fprintf(ofp, "                           Tracepoint loglevel (only this loglevel)\n");
 146         fprintf(ofp, "\n");
 147         fprintf(ofp, "                           The loglevel or loglevel-only options should be\n");
 148         fprintf(ofp, "                           combined with a tracepoint name or tracepoint\n");
 149         fprintf(ofp, "                           wildcard.\n");
 150         fprintf(ofp, "                           Available loglevels:\n");
 151         fprintf(ofp, "                                              (higher value is more verbose)\n");
 152         fprintf(ofp, "                               TRACE_EMERG          = 0\n");
 153         fprintf(ofp, "                               TRACE_ALERT          = 1\n");
 154         fprintf(ofp, "                               TRACE_CRIT           = 2\n");
 155         fprintf(ofp, "                               TRACE_ERR            = 3\n");
 156         fprintf(ofp, "                               TRACE_WARNING        = 4\n");
 157         fprintf(ofp, "                               TRACE_NOTICE         = 5\n");
 158         fprintf(ofp, "                               TRACE_INFO           = 6\n");
 159         fprintf(ofp, "                               TRACE_DEBUG_SYSTEM   = 7\n");
 160         fprintf(ofp, "                               TRACE_DEBUG_PROGRAM  = 8\n");
 161         fprintf(ofp, "                               TRACE_DEBUG_PROCESS  = 9\n");
 162         fprintf(ofp, "                               TRACE_DEBUG_MODULE   = 10\n");
 163         fprintf(ofp, "                               TRACE_DEBUG_UNIT     = 11\n");
 164         fprintf(ofp, "                               TRACE_DEBUG_FUNCTION = 12\n");
 165         fprintf(ofp, "                               TRACE_DEBUG_LINE     = 13\n");
 166         fprintf(ofp, "                               TRACE_DEBUG          = 14\n");
 167         fprintf(ofp, "                               (shortcuts such as \"system\" are allowed)\n");
 168         fprintf(ofp, "\n");
 169         fprintf(ofp, "                           Available JUL domain loglevels:\n");
 170         fprintf(ofp, "                               JUL_OFF            = INT32_MAX\n");
 171         fprintf(ofp, "                               JUL_SEVERE         = %d\n", LTTNG_LOGLEVEL_JUL_SEVERE);
 172         fprintf(ofp, "                               JUL_WARNING        = %d\n", LTTNG_LOGLEVEL_JUL_WARNING);
 173         fprintf(ofp, "                               JUL_INFO           = %d\n", LTTNG_LOGLEVEL_JUL_INFO);
 174         fprintf(ofp, "                               JUL_CONFIG         = %d\n", LTTNG_LOGLEVEL_JUL_CONFIG);
 175         fprintf(ofp, "                               JUL_FINE           = %d\n", LTTNG_LOGLEVEL_JUL_FINE);
 176         fprintf(ofp, "                               JUL_FINER          = %d\n", LTTNG_LOGLEVEL_JUL_FINER);
 177         fprintf(ofp, "                               JUL_FINEST         = %d\n", LTTNG_LOGLEVEL_JUL_FINEST);
 178         fprintf(ofp, "                               JUL_ALL            = INT32_MIN\n");
 179         fprintf(ofp, "                               (shortcuts such as \"severe\" are allowed)\n");
 180         fprintf(ofp, "\n");
 181         fprintf(ofp, "  -f, --filter \'expression\'\n");
 182         fprintf(ofp, "                           Filter expression on event fields and context.\n");
 183         fprintf(ofp, "                           Event recording depends on evaluation.\n");
 184         fprintf(ofp, "                           Only specify on first activation of\n");
 185         fprintf(ofp, "                           a given event within a session.\n");
 186         fprintf(ofp, "                           Filter only allowed when enabling\n");
 187         fprintf(ofp, "                           events within a session before tracing\n");
 188         fprintf(ofp, "                           is started. If the filter fails to link\n");
 189         fprintf(ofp, "                           with the event within the traced domain,\n");
 190         fprintf(ofp, "                           the event will be discarded. Currently,\n");
 191         fprintf(ofp, "                           filter is only implemented for the user-space\n");
 192         fprintf(ofp, "                           tracer.\n");
 193         fprintf(ofp, "                           Expression examples:.\n");
 194         fprintf(ofp, "                           \n");
 195         fprintf(ofp, "                           'intfield > 500 && intfield < 503'\n");
 196         fprintf(ofp, "                           '(strfield == \"test\" || intfield != 10) && intfield > 33'\n");
 197         fprintf(ofp, "                           'doublefield > 1.1 && intfield < 5.3'\n");
 198         fprintf(ofp, "                           \n");
 199         fprintf(ofp, "                           Wildcards are allowed at the end of strings:\n");
 200         fprintf(ofp, "                           'seqfield1 == \"te*\"'\n");
 201         fprintf(ofp, "                           In string literals, the escape character is '\\'.\n");
 202         fprintf(ofp, "                           Use '\\*' for the '*' character, and '\\\\' for\n");
 203         fprintf(ofp, "                           the '\\' character. Wildcard match any sequence of,\n");
 204         fprintf(ofp, "                           characters including an empty sub-string (match 0 or\n");
 205         fprintf(ofp, "                           more characters).\n");
 206         fprintf(ofp, "\n");
 207         fprintf(ofp, "                           Context information can be used for filtering. The\n");
 208         fprintf(ofp, "                           examples below show usage of context filtering on\n");
 209         fprintf(ofp, "                           process name (with a wildcard), process ID range, and\n");
 210         fprintf(ofp, "                           unique thread ID for filtering. The process and\n");
 211         fprintf(ofp, "                           thread ID of running applications can be found under\n");
 212         fprintf(ofp, "                           columns \"PID\" and \"LWP\" of the \"ps -eLf\" command.\n");
 213         fprintf(ofp, "\n");
 214         fprintf(ofp, "                           '$ctx.procname == \"demo*\"'\n");
 215         fprintf(ofp, "                           '$ctx.vpid >= 4433 && $ctx.vpid < 4455'\n");
 216         fprintf(ofp, "                           '$ctx.vtid == 1234'\n");
 217         fprintf(ofp, "  -x, --exclude LIST\n");
 218         fprintf(ofp, "                           Add exclusions to UST tracepoints:\n");
 219         fprintf(ofp, "                           Events that match any of the items\n");
 220         fprintf(ofp, "                           in the comma-separated LIST are not\n");
 221         fprintf(ofp, "                           enabled, even if they match a wildcard\n");
 222         fprintf(ofp, "                           definition of the event.\n");
 223         fprintf(ofp, "\n");
 224 }
 225
 226 /*
 227  * Parse probe options.
 228  */
 229 static int parse_probe_opts(struct lttng_event *ev, char *opt)
 230 {
 231         int ret = CMD_SUCCESS;
 232         int match;
 233         char s_hex[19];
 234 #define S_HEX_LEN_SCANF_IS_A_BROKEN_API "18"    /* 18 is (19 - 1) (\0 is extra) */
 235         char name[LTTNG_SYMBOL_NAME_LEN];
 236
 237         if (opt == NULL) {
 238                 ret = CMD_ERROR;
 239                 goto end;
 240         }
 241
 242         /* Check for symbol+offset */
 243         match = sscanf(opt, "%" LTTNG_SYMBOL_NAME_LEN_SCANF_IS_A_BROKEN_API
 244                         "[^'+']+%" S_HEX_LEN_SCANF_IS_A_BROKEN_API "s", name, s_hex);
 245         if (match == 2) {
 246                 strncpy(ev->attr.probe.symbol_name, name, LTTNG_SYMBOL_NAME_LEN);
 247                 ev->attr.probe.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 248                 DBG("probe symbol %s", ev->attr.probe.symbol_name);
 249                 if (*s_hex == '\0') {
 250                         ERR("Invalid probe offset %s", s_hex);
 251                         ret = CMD_ERROR;
 252                         goto end;
 253                 }
 254                 ev->attr.probe.offset = strtoul(s_hex, NULL, 0);
 255                 DBG("probe offset %" PRIu64, ev->attr.probe.offset);
 256                 ev->attr.probe.addr = 0;
 257                 goto end;
 258         }
 259
 260         /* Check for symbol */
 261         if (isalpha(name[0])) {
 262                 match = sscanf(opt, "%" LTTNG_SYMBOL_NAME_LEN_SCANF_IS_A_BROKEN_API "s",
 263                         name);
 264                 if (match == 1) {
 265                         strncpy(ev->attr.probe.symbol_name, name, LTTNG_SYMBOL_NAME_LEN);
 266                         ev->attr.probe.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 267                         DBG("probe symbol %s", ev->attr.probe.symbol_name);
 268                         ev->attr.probe.offset = 0;
 269                         DBG("probe offset %" PRIu64, ev->attr.probe.offset);
 270                         ev->attr.probe.addr = 0;
 271                         goto end;
 272                 }
 273         }
 274
 275         /* Check for address */
 276         match = sscanf(opt, "%" S_HEX_LEN_SCANF_IS_A_BROKEN_API "s", s_hex);
 277         if (match > 0) {
 278                 if (*s_hex == '\0') {
 279                         ERR("Invalid probe address %s", s_hex);
 280                         ret = CMD_ERROR;
 281                         goto end;
 282                 }
 283                 ev->attr.probe.addr = strtoul(s_hex, NULL, 0);
 284                 DBG("probe addr %" PRIu64, ev->attr.probe.addr);
 285                 ev->attr.probe.offset = 0;
 286                 memset(ev->attr.probe.symbol_name, 0, LTTNG_SYMBOL_NAME_LEN);
 287                 goto end;
 288         }
 289
 290         /* No match */
 291         ret = CMD_ERROR;
 292
 293 end:
 294         return ret;
 295 }
 296
 297 /*
 298  * Maps JUL loglevel from string to value
 299  */
 300 static int loglevel_jul_str_to_value(const char *inputstr)
 301 {
 302         int i = 0;
 303         char str[LTTNG_SYMBOL_NAME_LEN];
 304
 305         /*
 306          * Loop up to LTTNG_SYMBOL_NAME_LEN minus one because the NULL bytes is
 307          * added at the end of the loop so a the upper bound we avoid the overflow.
 308          */
 309         while (i < (LTTNG_SYMBOL_NAME_LEN - 1) && inputstr[i] != '\0') {
 310                 str[i] = toupper(inputstr[i]);
 311                 i++;
 312         }
 313         str[i] = '\0';
 314
 315         if (!strcmp(str, "JUL_OFF") || !strcmp(str, "OFF")) {
 316                 return LTTNG_LOGLEVEL_JUL_OFF;
 317         } else if (!strcmp(str, "JUL_SEVERE") || !strcmp(str, "SEVERE")) {
 318                 return LTTNG_LOGLEVEL_JUL_SEVERE;
 319         } else if (!strcmp(str, "JUL_WARNING") || !strcmp(str, "WARNING")) {
 320                 return LTTNG_LOGLEVEL_JUL_WARNING;
 321         } else if (!strcmp(str, "JUL_INFO") || !strcmp(str, "INFO")) {
 322                 return LTTNG_LOGLEVEL_JUL_INFO;
 323         } else if (!strcmp(str, "JUL_CONFIG") || !strcmp(str, "CONFIG")) {
 324                 return LTTNG_LOGLEVEL_JUL_CONFIG;
 325         } else if (!strcmp(str, "JUL_FINE") || !strcmp(str, "FINE")) {
 326                 return LTTNG_LOGLEVEL_JUL_FINE;
 327         } else if (!strcmp(str, "JUL_FINER") || !strcmp(str, "FINER")) {
 328                 return LTTNG_LOGLEVEL_JUL_FINER;
 329         } else if (!strcmp(str, "JUL_FINEST") || !strcmp(str, "FINEST")) {
 330                 return LTTNG_LOGLEVEL_JUL_FINEST;
 331         } else if (!strcmp(str, "JUL_ALL") || !strcmp(str, "ALL")) {
 332                 return LTTNG_LOGLEVEL_JUL_ALL;
 333         } else {
 334                 return -1;
 335         }
 336 }
 337
 338 /*
 339  * Maps loglevel from string to value
 340  */
 341 static
 342 int loglevel_str_to_value(const char *inputstr)
 343 {
 344         int i = 0;
 345         char str[LTTNG_SYMBOL_NAME_LEN];
 346
 347         /*
 348          * Loop up to LTTNG_SYMBOL_NAME_LEN minus one because the NULL bytes is
 349          * added at the end of the loop so a the upper bound we avoid the overflow.
 350          */
 351         while (i < (LTTNG_SYMBOL_NAME_LEN - 1) && inputstr[i] != '\0') {
 352                 str[i] = toupper(inputstr[i]);
 353                 i++;
 354         }
 355         str[i] = '\0';
 356         if (!strcmp(str, "TRACE_EMERG") || !strcmp(str, "EMERG")) {
 357                 return LTTNG_LOGLEVEL_EMERG;
 358         } else if (!strcmp(str, "TRACE_ALERT") || !strcmp(str, "ALERT")) {
 359                 return LTTNG_LOGLEVEL_ALERT;
 360         } else if (!strcmp(str, "TRACE_CRIT") || !strcmp(str, "CRIT")) {
 361                 return LTTNG_LOGLEVEL_CRIT;
 362         } else if (!strcmp(str, "TRACE_ERR") || !strcmp(str, "ERR")) {
 363                 return LTTNG_LOGLEVEL_ERR;
 364         } else if (!strcmp(str, "TRACE_WARNING") || !strcmp(str, "WARNING")) {
 365                 return LTTNG_LOGLEVEL_WARNING;
 366         } else if (!strcmp(str, "TRACE_NOTICE") || !strcmp(str, "NOTICE")) {
 367                 return LTTNG_LOGLEVEL_NOTICE;
 368         } else if (!strcmp(str, "TRACE_INFO") || !strcmp(str, "INFO")) {
 369                 return LTTNG_LOGLEVEL_INFO;
 370         } else if (!strcmp(str, "TRACE_DEBUG_SYSTEM") || !strcmp(str, "DEBUG_SYSTEM") || !strcmp(str, "SYSTEM")) {
 371                 return LTTNG_LOGLEVEL_DEBUG_SYSTEM;
 372         } else if (!strcmp(str, "TRACE_DEBUG_PROGRAM") || !strcmp(str, "DEBUG_PROGRAM") || !strcmp(str, "PROGRAM")) {
 373                 return LTTNG_LOGLEVEL_DEBUG_PROGRAM;
 374         } else if (!strcmp(str, "TRACE_DEBUG_PROCESS") || !strcmp(str, "DEBUG_PROCESS") || !strcmp(str, "PROCESS")) {
 375                 return LTTNG_LOGLEVEL_DEBUG_PROCESS;
 376         } else if (!strcmp(str, "TRACE_DEBUG_MODULE") || !strcmp(str, "DEBUG_MODULE") || !strcmp(str, "MODULE")) {
 377                 return LTTNG_LOGLEVEL_DEBUG_MODULE;
 378         } else if (!strcmp(str, "TRACE_DEBUG_UNIT") || !strcmp(str, "DEBUG_UNIT") || !strcmp(str, "UNIT")) {
 379                 return LTTNG_LOGLEVEL_DEBUG_UNIT;
 380         } else if (!strcmp(str, "TRACE_DEBUG_FUNCTION") || !strcmp(str, "DEBUG_FUNCTION") || !strcmp(str, "FUNCTION")) {
 381                 return LTTNG_LOGLEVEL_DEBUG_FUNCTION;
 382         } else if (!strcmp(str, "TRACE_DEBUG_LINE") || !strcmp(str, "DEBUG_LINE") || !strcmp(str, "LINE")) {
 383                 return LTTNG_LOGLEVEL_DEBUG_LINE;
 384         } else if (!strcmp(str, "TRACE_DEBUG") || !strcmp(str, "DEBUG")) {
 385                 return LTTNG_LOGLEVEL_DEBUG;
 386         } else {
 387                 return -1;
 388         }
 389 }
 390
 391 static
 392 const char *print_channel_name(const char *name)
 393 {
 394         return name ? : DEFAULT_CHANNEL_NAME;
 395 }
 396
 397 static
 398 const char *print_raw_channel_name(const char *name)
 399 {
 400         return name ? : "<default>";
 401 }
 402
 403 /*
 404  * Return allocated string for pretty-printing exclusion names.
 405  */
 406 static
 407 char *print_exclusions(int count, char **names)
 408 {
 409         int length = 0;
 410         int i;
 411         const char *preamble = " excluding ";
 412         char *ret;
 413
 414         if (count == 0) {
 415                 return strdup("");
 416         }
 417
 418         /* calculate total required length */
 419         for (i = 0; i < count; i++) {
 420                 length += strlen(names[i]) + 1;
 421         }
 422
 423         /* add length of preamble + one for NUL - one for last (missing) comma */
 424         length += strlen(preamble);
 425         ret = zmalloc(length);
 426         if (!ret) {
 427                 return NULL;
 428         }
 429         strncpy(ret, preamble, length);
 430         for (i = 0; i < count; i++) {
 431                 strcat(ret, names[i]);
 432                 if (i != count - 1) {
 433                         strcat(ret, ",");
 434                 }
 435         }
 436         return ret;
 437 }
 438
 439 /*
 440  * Compare list of exclusions against an event name.
 441  * Return a list of legal exclusion names.
 442  * Produce an error or a warning about others (depending on the situation)
 443  */
 444 static
 445 int check_exclusion_subsets(const char *event_name,
 446                 const char *exclusions,
 447                 int *exclusion_count_ptr,
 448                 char ***exclusion_list_ptr)
 449 {
 450         const char *excluder_ptr;
 451         const char *event_ptr;
 452         const char *next_excluder;
 453         int excluder_length;
 454         int exclusion_count = 0;
 455         char **exclusion_list = NULL;
 456         int ret = CMD_SUCCESS;
 457
 458         if (event_name[strlen(event_name) - 1] != '*') {
 459                 ERR("Event %s: Excluders can only be used with wildcarded events", event_name);
 460                 goto error;
 461         }
 462
 463         next_excluder = exclusions;
 464         while (*next_excluder != 0) {
 465                 event_ptr = event_name;
 466                 excluder_ptr = next_excluder;
 467                 excluder_length = strcspn(next_excluder, ",");
 468
 469                 /* Scan both the excluder and the event letter by letter */
 470                 while (1) {
 471                         char e, x;
 472
 473                         e = *event_ptr;
 474                         x = *excluder_ptr;
 475
 476                         if (x == '*') {
 477                                 /* Event is a subset of the excluder */
 478                                 ERR("Event %s: %.*s excludes all events from %s",
 479                                                 event_name,
 480                                                 excluder_length,
 481                                                 next_excluder,
 482                                                 event_name);
 483                                 goto error;
 484                         }
 485                         if (e == '*') {
 486                                 /* Excluder is a proper subset of event */
 487                                 exclusion_count++;
 488                                 exclusion_list = realloc(exclusion_list, sizeof(char **) * exclusion_count);
 489                                 exclusion_list[exclusion_count - 1] = strndup(next_excluder, excluder_length);
 490
 491                                 break;
 492                         }
 493                         if (x != e) {
 494                                 /* Excluder and event sets have no common elements */
 495                                 WARN("Event %s: %.*s does not exclude any events from %s",
 496                                                 event_name,
 497                                                 excluder_length,
 498                                                 next_excluder,
 499                                                 event_name);
 500                                 break;
 501                         }
 502                         excluder_ptr++;
 503                         event_ptr++;
 504                 }
 505                 /* next excluder */
 506                 next_excluder += excluder_length;
 507                 if (*next_excluder == ',') {
 508                         next_excluder++;
 509                 }
 510         }
 511         goto end;
 512 error:
 513         while (exclusion_count--) {
 514                 free(exclusion_list[exclusion_count]);
 515         }
 516         if (exclusion_list != NULL) {
 517                 free(exclusion_list);
 518         }
 519         exclusion_list = NULL;
 520         exclusion_count = 0;
 521         ret = CMD_ERROR;
 522 end:
 523         *exclusion_count_ptr = exclusion_count;
 524         *exclusion_list_ptr = exclusion_list;
 525         return ret;
 526 }
 527 /*
 528  * Enabling event using the lttng API.
 529  */
 530 static int enable_events(char *session_name)
 531 {
 532         int ret = CMD_SUCCESS, warn = 0;
 533         char *event_name, *channel_name = NULL;
 534         struct lttng_event ev;
 535         struct lttng_domain dom;
 536         int exclusion_count = 0;
 537         char **exclusion_list = NULL;
 538
 539         memset(&ev, 0, sizeof(ev));
 540         memset(&dom, 0, sizeof(dom));
 541
 542         if (opt_kernel) {
 543                 if (opt_filter) {
 544                         ERR("Filter not implement for kernel tracing yet");
 545                         ret = CMD_ERROR;
 546                         goto error;
 547                 }
 548                 if (opt_loglevel) {
 549                         WARN("Kernel loglevels are not supported.");
 550                 }
 551         }
 552
 553         /* Create lttng domain */
 554         if (opt_kernel) {
 555                 dom.type = LTTNG_DOMAIN_KERNEL;
 556                 dom.buf_type = LTTNG_BUFFER_GLOBAL;
 557         } else if (opt_userspace) {
 558                 dom.type = LTTNG_DOMAIN_UST;
 559                 /* Default. */
 560                 dom.buf_type = LTTNG_BUFFER_PER_UID;
 561         } else if (opt_jul) {
 562                 dom.type = LTTNG_DOMAIN_JUL;
 563                 /* Default. */
 564                 dom.buf_type = LTTNG_BUFFER_PER_UID;
 565         } else {
 566                 print_missing_domain();
 567                 ret = CMD_ERROR;
 568                 goto error;
 569         }
 570
 571         if (opt_kernel && opt_exclude) {
 572                 ERR("Event name exclusions are not yet implemented for kernel events");
 573                 ret = CMD_ERROR;
 574                 goto error;
 575         }
 576
 577         channel_name = opt_channel_name;
 578
 579         handle = lttng_create_handle(session_name, &dom);
 580         if (handle == NULL) {
 581                 ret = -1;
 582                 goto error;
 583         }
 584
 585         if (opt_enable_all) {
 586                 /* Default setup for enable all */
 587                 if (opt_kernel) {
 588                         ev.type = opt_event_type;
 589                         ev.name[0] = '\0';
 590                         /* kernel loglevels not implemented */
 591                         ev.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
 592                 } else {
 593                         ev.type = LTTNG_EVENT_TRACEPOINT;
 594                         strcpy(ev.name, "*");
 595                         ev.loglevel_type = opt_loglevel_type;
 596                         if (opt_loglevel) {
 597                                 assert(opt_userspace || opt_jul);
 598                                 if (opt_userspace) {
 599                                         ev.loglevel = loglevel_str_to_value(opt_loglevel);
 600                                 } else if (opt_jul) {
 601                                         ev.loglevel = loglevel_jul_str_to_value(opt_loglevel);
 602                                 }
 603                                 if (ev.loglevel == -1) {
 604                                         ERR("Unknown loglevel %s", opt_loglevel);
 605                                         ret = -LTTNG_ERR_INVALID;
 606                                         goto error;
 607                                 }
 608                         } else {
 609                                 assert(opt_userspace || opt_jul);
 610                                 if (opt_userspace) {
 611                                         ev.loglevel = -1;
 612                                 } else if (opt_jul) {
 613                                         ev.loglevel = LTTNG_LOGLEVEL_JUL_ALL;
 614                                 }
 615                         }
 616                 }
 617
 618                 if (opt_exclude) {
 619                         ret = check_exclusion_subsets("*", opt_exclude,
 620                                         &exclusion_count, &exclusion_list);
 621                         if (ret == CMD_ERROR) {
 622                                 goto error;
 623                         }
 624                 }
 625                 if (!opt_filter) {
 626                         ret = lttng_enable_event_with_exclusions(handle,
 627                                         &ev, channel_name,
 628                                         NULL,
 629                                         exclusion_count, exclusion_list);
 630                         if (ret < 0) {
 631                                 switch (-ret) {
 632                                 case LTTNG_ERR_KERN_EVENT_EXIST:
 633                                         WARN("Kernel events already enabled (channel %s, session %s)",
 634                                                         print_channel_name(channel_name), session_name);
 635                                         break;
 636                                 case LTTNG_ERR_TRACE_ALREADY_STARTED:
 637                                 {
 638                                         const char *msg = "The command tried to enable an event in a new domain for a session that has already been started once.";
 639                                         ERR("Events: %s (channel %s, session %s)",
 640                                                         msg,
 641                                                         print_channel_name(channel_name),
 642                                                         session_name);
 643                                         ret = CMD_ERROR;
 644                                         break;
 645                                 }
 646                                 default:
 647                                         ERR("Events: %s (channel %s, session %s)",
 648                                                         lttng_strerror(ret),
 649                                                         ret == -LTTNG_ERR_NEED_CHANNEL_NAME
 650                                                                 ? print_raw_channel_name(channel_name)
 651                                                                 : print_channel_name(channel_name),
 652                                                         session_name);
 653                                         break;
 654                                 }
 655                                 goto end;
 656                         }
 657
 658                         switch (opt_event_type) {
 659                         case LTTNG_EVENT_TRACEPOINT:
 660                                 if (opt_loglevel && dom.type != LTTNG_DOMAIN_KERNEL) {
 661                                         char *exclusion_string = print_exclusions(exclusion_count, exclusion_list);
 662                                         MSG("All %s tracepoints%s are enabled in channel %s for loglevel %s",
 663                                                         get_domain_str(dom.type),
 664                                                         exclusion_string,
 665                                                         print_channel_name(channel_name),
 666                                                         opt_loglevel);
 667                                         free(exclusion_string);
 668                                 } else {
 669                                         char *exclusion_string = print_exclusions(exclusion_count, exclusion_list);
 670                                         MSG("All %s tracepoints%s are enabled in channel %s",
 671                                                         get_domain_str(dom.type),
 672                                                         exclusion_string,
 673                                                         print_channel_name(channel_name));
 674                                         free(exclusion_string);
 675                                 }
 676                                 break;
 677                         case LTTNG_EVENT_SYSCALL:
 678                                 if (opt_kernel) {
 679                                         MSG("All kernel system calls are enabled in channel %s",
 680                                                         print_channel_name(channel_name));
 681                                 }
 682                                 break;
 683                         case LTTNG_EVENT_ALL:
 684                                 if (opt_loglevel && dom.type != LTTNG_DOMAIN_KERNEL) {
 685                                         char *exclusion_string = print_exclusions(exclusion_count, exclusion_list);
 686                                         MSG("All %s events%s are enabled in channel %s for loglevel %s",
 687                                                         get_domain_str(dom.type),
 688                                                         exclusion_string,
 689                                                         print_channel_name(channel_name),
 690                                                         opt_loglevel);
 691                                         free(exclusion_string);
 692                                 } else {
 693                                         char *exclusion_string = print_exclusions(exclusion_count, exclusion_list);
 694                                         MSG("All %s events%s are enabled in channel %s",
 695                                                         get_domain_str(dom.type),
 696                                                         exclusion_string,
 697                                                         print_channel_name(channel_name));
 698                                         free(exclusion_string);
 699                                 }
 700                                 break;
 701                         default:
 702                                 /*
 703                                  * We should not be here since lttng_enable_event should have
 704                                  * failed on the event type.
 705                                  */
 706                                 goto error;
 707                         }
 708                 }
 709                 if (opt_filter) {
 710                         ret = lttng_enable_event_with_exclusions(handle, &ev, channel_name,
 711                                                 opt_filter, exclusion_count, exclusion_list);
 712                         if (ret < 0) {
 713                                 switch (-ret) {
 714                                 case LTTNG_ERR_FILTER_EXIST:
 715                                         WARN("Filter on all events is already enabled"
 716                                                         " (channel %s, session %s)",
 717                                                 print_channel_name(channel_name), session_name);
 718                                         break;
 719                                 case LTTNG_ERR_TRACE_ALREADY_STARTED:
 720                                 {
 721                                         const char *msg = "The command tried to enable an event in a new domain for a session that has already been started once.";
 722                                         ERR("All events: %s (channel %s, session %s, filter \'%s\')",
 723                                                         msg,
 724                                                         print_channel_name(channel_name),
 725                                                         session_name, opt_filter);
 726                                         ret = CMD_ERROR;
 727                                         break;
 728                                 }
 729                                 default:
 730                                         ERR("All events: %s (channel %s, session %s, filter \'%s\')",
 731                                                         lttng_strerror(ret),
 732                                                         ret == -LTTNG_ERR_NEED_CHANNEL_NAME
 733                                                                 ? print_raw_channel_name(channel_name)
 734                                                                 : print_channel_name(channel_name),
 735                                                         session_name, opt_filter);
 736                                         break;
 737                                 }
 738                                 goto error;
 739                         } else {
 740                                 MSG("Filter '%s' successfully set", opt_filter);
 741                         }
 742                 }
 743                 goto end;
 744         }
 745
 746         /* Strip event list */
 747         event_name = strtok(opt_event_list, ",");
 748         while (event_name != NULL) {
 749                 /* Copy name and type of the event */
 750                 strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
 751                 ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 752                 ev.type = opt_event_type;
 753
 754                 /* Kernel tracer action */
 755                 if (opt_kernel) {
 756                         DBG("Enabling kernel event %s for channel %s",
 757                                         event_name,
 758                                         print_channel_name(channel_name));
 759
 760                         switch (opt_event_type) {
 761                         case LTTNG_EVENT_ALL:   /* Default behavior is tracepoint */
 762                                 ev.type = LTTNG_EVENT_TRACEPOINT;
 763                                 /* Fall-through */
 764                         case LTTNG_EVENT_TRACEPOINT:
 765                                 break;
 766                         case LTTNG_EVENT_PROBE:
 767                                 ret = parse_probe_opts(&ev, opt_probe);
 768                                 if (ret) {
 769                                         ERR("Unable to parse probe options");
 770                                         ret = 0;
 771                                         goto error;
 772                                 }
 773                                 break;
 774                         case LTTNG_EVENT_FUNCTION:
 775                                 ret = parse_probe_opts(&ev, opt_function);
 776                                 if (ret) {
 777                                         ERR("Unable to parse function probe options");
 778                                         ret = 0;
 779                                         goto error;
 780                                 }
 781                                 break;
 782                         case LTTNG_EVENT_FUNCTION_ENTRY:
 783                                 strncpy(ev.attr.ftrace.symbol_name, opt_function_entry_symbol,
 784                                                 LTTNG_SYMBOL_NAME_LEN);
 785                                 ev.attr.ftrace.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 786                                 break;
 787                         case LTTNG_EVENT_SYSCALL:
 788                                 MSG("per-syscall selection not supported yet. Use \"-a\" "
 789                                                 "for all syscalls.");
 790                         default:
 791                                 ret = CMD_UNDEFINED;
 792                                 goto error;
 793                         }
 794
 795                         /* kernel loglevels not implemented */
 796                         ev.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
 797                 } else if (opt_userspace) {             /* User-space tracer action */
 798 #if 0
 799                         if (opt_cmd_name != NULL || opt_pid) {
 800                                 MSG("Only supporting tracing all UST processes (-u) for now.");
 801                                 ret = CMD_UNDEFINED;
 802                                 goto error;
 803                         }
 804 #endif
 805
 806                         DBG("Enabling UST event %s for channel %s, loglevel %s", event_name,
 807                                         print_channel_name(channel_name), opt_loglevel ? : "<all>");
 808
 809                         switch (opt_event_type) {
 810                         case LTTNG_EVENT_ALL:   /* Default behavior is tracepoint */
 811                                 /* Fall-through */
 812                         case LTTNG_EVENT_TRACEPOINT:
 813                                 /* Copy name and type of the event */
 814                                 ev.type = LTTNG_EVENT_TRACEPOINT;
 815                                 strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
 816                                 ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 817                                 break;
 818                         case LTTNG_EVENT_PROBE:
 819                         case LTTNG_EVENT_FUNCTION:
 820                         case LTTNG_EVENT_FUNCTION_ENTRY:
 821                         case LTTNG_EVENT_SYSCALL:
 822                         default:
 823                                 ERR("Event type not available for user-space tracing");
 824                                 ret = CMD_UNSUPPORTED;
 825                                 goto error;
 826                         }
 827
 828                         if (opt_exclude) {
 829                                 if (opt_event_type != LTTNG_EVENT_ALL && opt_event_type != LTTNG_EVENT_TRACEPOINT) {
 830                                         ERR("Exclusion option can only be used with tracepoint events");
 831                                         ret = CMD_ERROR;
 832                                         goto error;
 833                                 }
 834                                 /* Free previously allocated items */
 835                                 if (exclusion_list != NULL) {
 836                                         while (exclusion_count--) {
 837                                                 free(exclusion_list[exclusion_count]);
 838                                         }
 839                                         free(exclusion_list);
 840                                         exclusion_list = NULL;
 841                                 }
 842                                 /* Check for proper subsets */
 843                                 ret = check_exclusion_subsets(event_name, opt_exclude,
 844                                                 &exclusion_count, &exclusion_list);
 845                                 if (ret == CMD_ERROR) {
 846                                         goto error;
 847                                 }
 848                         }
 849
 850                         ev.loglevel_type = opt_loglevel_type;
 851                         if (opt_loglevel) {
 852                                 ev.loglevel = loglevel_str_to_value(opt_loglevel);
 853                                 if (ev.loglevel == -1) {
 854                                         ERR("Unknown loglevel %s", opt_loglevel);
 855                                         ret = -LTTNG_ERR_INVALID;
 856                                         goto error;
 857                                 }
 858                         } else {
 859                                 ev.loglevel = -1;
 860                         }
 861                 } else if (opt_jul) {
 862                         if (opt_event_type != LTTNG_EVENT_ALL &&
 863                                         opt_event_type != LTTNG_EVENT_TRACEPOINT) {
 864                                 ERR("Event type not supported for JUL domain.");
 865                                 ret = CMD_UNSUPPORTED;
 866                                 goto error;
 867                         }
 868
 869                         ev.loglevel_type = opt_loglevel_type;
 870                         if (opt_loglevel) {
 871                                 ev.loglevel = loglevel_jul_str_to_value(opt_loglevel);
 872                                 if (ev.loglevel == -1) {
 873                                         ERR("Unknown loglevel %s", opt_loglevel);
 874                                         ret = -LTTNG_ERR_INVALID;
 875                                         goto error;
 876                                 }
 877                         } else {
 878                                 ev.loglevel = LTTNG_LOGLEVEL_JUL_ALL;
 879                         }
 880                         ev.type = LTTNG_EVENT_TRACEPOINT;
 881                         strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
 882                         ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 883                 } else {
 884                         print_missing_domain();
 885                         ret = CMD_ERROR;
 886                         goto error;
 887                 }
 888
 889                 if (!opt_filter) {
 890                         char *exclusion_string;
 891
 892                         ret = lttng_enable_event_with_exclusions(handle,
 893                                         &ev, channel_name,
 894                                         NULL, exclusion_count, exclusion_list);
 895                         exclusion_string = print_exclusions(exclusion_count, exclusion_list);
 896                         if (ret < 0) {
 897                                 /* Turn ret to positive value to handle the positive error code */
 898                                 switch (-ret) {
 899                                 case LTTNG_ERR_KERN_EVENT_EXIST:
 900                                         WARN("Kernel event %s%s already enabled (channel %s, session %s)",
 901                                                         event_name,
 902                                                         exclusion_string,
 903                                                         print_channel_name(channel_name), session_name);
 904                                         warn = 1;
 905                                         break;
 906                                 case LTTNG_ERR_TRACE_ALREADY_STARTED:
 907                                 {
 908                                         const char *msg = "The command tried to enable an event in a new domain for a session that has already been started once.";
 909                                         ERR("Event %s%s: %s (channel %s, session %s)", event_name,
 910                                                         exclusion_string,
 911                                                         msg,
 912                                                         print_channel_name(channel_name),
 913                                                         session_name);
 914                                         ret = CMD_ERROR;
 915                                         break;
 916                                 }
 917                                 default:
 918                                         ERR("Event %s%s: %s (channel %s, session %s)", event_name,
 919                                                         exclusion_string,
 920                                                         lttng_strerror(ret),
 921                                                         ret == -LTTNG_ERR_NEED_CHANNEL_NAME
 922                                                                 ? print_raw_channel_name(channel_name)
 923                                                                 : print_channel_name(channel_name),
 924                                                         session_name);
 925                                         warn = 1;
 926                                         break;
 927                                 }
 928                         } else {
 929                                 MSG("%s event %s%s created in channel %s",
 930                                                 get_domain_str(dom.type), event_name,
 931                                                 exclusion_string,
 932                                                 print_channel_name(channel_name));
 933                         }
 934                         free(exclusion_string);
 935                 }
 936
 937                 if (opt_filter) {
 938                         char *exclusion_string;
 939
 940                         ret = lttng_enable_event_with_exclusions(handle, &ev, channel_name,
 941                                         opt_filter, exclusion_count, exclusion_list);
 942                         exclusion_string = print_exclusions(exclusion_count, exclusion_list);
 943
 944                         if (ret < 0) {
 945                                 switch (-ret) {
 946                                 case LTTNG_ERR_FILTER_EXIST:
 947                                         WARN("Filter on event %s%s is already enabled"
 948                                                         " (channel %s, session %s)",
 949                                                 event_name,
 950                                                 exclusion_string,
 951                                                 print_channel_name(channel_name), session_name);
 952                                         break;
 953                                 case LTTNG_ERR_TRACE_ALREADY_STARTED:
 954                                 {
 955                                         const char *msg = "The command tried to enable an event in a new domain for a session that has already been started once.";
 956                                         ERR("Event %s%s: %s (channel %s, session %s, filter \'%s\')", ev.name,
 957                                                         exclusion_string,
 958                                                         msg,
 959                                                         print_channel_name(channel_name),
 960                                                         session_name, opt_filter);
 961                                         ret = CMD_ERROR;
 962                                         break;
 963                                 }
 964                                 default:
 965                                         ERR("Event %s%s: %s (channel %s, session %s, filter \'%s\')", ev.name,
 966                                                         exclusion_string,
 967                                                         lttng_strerror(ret),
 968                                                         ret == -LTTNG_ERR_NEED_CHANNEL_NAME
 969                                                                 ? print_raw_channel_name(channel_name)
 970                                                                 : print_channel_name(channel_name),
 971                                                         session_name, opt_filter);
 972                                         break;
 973                                 }
 974                                 free(exclusion_string);
 975                                 goto error;
 976                         } else {
 977                                 MSG("Event %s%s: Filter '%s' successfully set",
 978                                                 event_name, exclusion_string,
 979                                                 opt_filter);
 980                         }
 981                         free(exclusion_string);
 982                 }
 983
 984                 /* Next event */
 985                 event_name = strtok(NULL, ",");
 986         }
 987
 988 end:
 989 error:
 990         if (warn) {
 991                 ret = CMD_WARNING;
 992         }
 993         lttng_destroy_handle(handle);
 994
 995         if (exclusion_list != NULL) {
 996                 while (exclusion_count--) {
 997                         free(exclusion_list[exclusion_count]);
 998                 }
 999                 free(exclusion_list);
1000         }
1001
1002         return ret;
1003 }
1004
1005 /*
1006  * Add event to trace session
1007  */
1008 int cmd_enable_events(int argc, const char **argv)
1009 {
1010         int opt, ret = CMD_SUCCESS;
1011         static poptContext pc;
1012         char *session_name = NULL;
1013         int event_type = -1;
1014
1015         pc = poptGetContext(NULL, argc, argv, long_options, 0);
1016         poptReadDefaultConfig(pc, 0);
1017
1018         /* Default event type */
1019         opt_event_type = LTTNG_EVENT_ALL;
1020
1021         while ((opt = poptGetNextOpt(pc)) != -1) {
1022                 switch (opt) {
1023                 case OPT_HELP:
1024                         usage(stdout);
1025                         goto end;
1026                 case OPT_TRACEPOINT:
1027                         opt_event_type = LTTNG_EVENT_TRACEPOINT;
1028                         break;
1029                 case OPT_PROBE:
1030                         opt_event_type = LTTNG_EVENT_PROBE;
1031                         break;
1032                 case OPT_FUNCTION:
1033                         opt_event_type = LTTNG_EVENT_FUNCTION;
1034                         break;
1035                 case OPT_FUNCTION_ENTRY:
1036                         opt_event_type = LTTNG_EVENT_FUNCTION_ENTRY;
1037                         break;
1038                 case OPT_SYSCALL:
1039                         opt_event_type = LTTNG_EVENT_SYSCALL;
1040                         break;
1041                 case OPT_USERSPACE:
1042                         opt_userspace = 1;
1043                         break;
1044                 case OPT_LOGLEVEL:
1045                         opt_loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
1046                         opt_loglevel = poptGetOptArg(pc);
1047                         break;
1048                 case OPT_LOGLEVEL_ONLY:
1049                         opt_loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
1050                         opt_loglevel = poptGetOptArg(pc);
1051                         break;
1052                 case OPT_LIST_OPTIONS:
1053                         list_cmd_options(stdout, long_options);
1054                         goto end;
1055                 case OPT_FILTER:
1056                         break;
1057                 case OPT_EXCLUDE:
1058                         break;
1059                 default:
1060                         usage(stderr);
1061                         ret = CMD_UNDEFINED;
1062                         goto end;
1063                 }
1064
1065                 /* Validate event type. Multiple event type are not supported. */
1066                 if (event_type == -1) {
1067                         event_type = opt_event_type;
1068                 } else {
1069                         if (event_type != opt_event_type) {
1070                                 ERR("Multiple event type not supported.");
1071                                 ret = CMD_ERROR;
1072                                 goto end;
1073                         }
1074                 }
1075         }
1076
1077         opt_event_list = (char*) poptGetArg(pc);
1078         if (opt_event_list == NULL && opt_enable_all == 0) {
1079                 ERR("Missing event name(s).\n");
1080                 usage(stderr);
1081                 ret = CMD_ERROR;
1082                 goto end;
1083         }
1084
1085         if (!opt_session_name) {
1086                 session_name = get_session_name();
1087                 if (session_name == NULL) {
1088                         ret = CMD_ERROR;
1089                         goto end;
1090                 }
1091         } else {
1092                 session_name = opt_session_name;
1093         }
1094
1095         ret = enable_events(session_name);
1096
1097 end:
1098         if (opt_session_name == NULL) {
1099                 free(session_name);
1100         }
1101
1102         poptFreeContext(pc);
1103         return ret;
1104 }