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