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, "\n");
 199 }
 200
 201 /*
 202  * Parse probe options.
 203  */
 204 static int parse_probe_opts(struct lttng_event *ev, char *opt)
 205 {
 206         int ret;
 207         char s_hex[19];
 208         char name[LTTNG_SYMBOL_NAME_LEN];
 209
 210         if (opt == NULL) {
 211                 ret = -1;
 212                 goto end;
 213         }
 214
 215         /* Check for symbol+offset */
 216         ret = sscanf(opt, "%[^'+']+%s", name, s_hex);
 217         if (ret == 2) {
 218                 strncpy(ev->attr.probe.symbol_name, name, LTTNG_SYMBOL_NAME_LEN);
 219                 ev->attr.probe.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 220                 DBG("probe symbol %s", ev->attr.probe.symbol_name);
 221                 if (*s_hex == '\0') {
 222                         ERR("Invalid probe offset %s", s_hex);
 223                         ret = -1;
 224                         goto end;
 225                 }
 226                 ev->attr.probe.offset = strtoul(s_hex, NULL, 0);
 227                 DBG("probe offset %" PRIu64, ev->attr.probe.offset);
 228                 ev->attr.probe.addr = 0;
 229                 goto end;
 230         }
 231
 232         /* Check for symbol */
 233         if (isalpha(name[0])) {
 234                 ret = sscanf(opt, "%s", name);
 235                 if (ret == 1) {
 236                         strncpy(ev->attr.probe.symbol_name, name, LTTNG_SYMBOL_NAME_LEN);
 237                         ev->attr.probe.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 238                         DBG("probe symbol %s", ev->attr.probe.symbol_name);
 239                         ev->attr.probe.offset = 0;
 240                         DBG("probe offset %" PRIu64, ev->attr.probe.offset);
 241                         ev->attr.probe.addr = 0;
 242                         goto end;
 243                 }
 244         }
 245
 246         /* Check for address */
 247         ret = sscanf(opt, "%s", s_hex);
 248         if (ret > 0) {
 249                 if (*s_hex == '\0') {
 250                         ERR("Invalid probe address %s", s_hex);
 251                         ret = -1;
 252                         goto end;
 253                 }
 254                 ev->attr.probe.addr = strtoul(s_hex, NULL, 0);
 255                 DBG("probe addr %" PRIu64, ev->attr.probe.addr);
 256                 ev->attr.probe.offset = 0;
 257                 memset(ev->attr.probe.symbol_name, 0, LTTNG_SYMBOL_NAME_LEN);
 258                 goto end;
 259         }
 260
 261         /* No match */
 262         ret = -1;
 263
 264 end:
 265         return ret;
 266 }
 267
 268 /*
 269  * Maps loglevel from string to value
 270  */
 271 static
 272 int loglevel_str_to_value(const char *inputstr)
 273 {
 274         int i = 0;
 275         char str[LTTNG_SYMBOL_NAME_LEN];
 276
 277         /*
 278          * Loop up to LTTNG_SYMBOL_NAME_LEN minus one because the NULL bytes is
 279          * added at the end of the loop so a the upper bound we avoid the overflow.
 280          */
 281         while (i < (LTTNG_SYMBOL_NAME_LEN - 1) && inputstr[i] != '\0') {
 282                 str[i] = toupper(inputstr[i]);
 283                 i++;
 284         }
 285         str[i] = '\0';
 286         if (!strcmp(str, "TRACE_EMERG") || !strcmp(str, "EMERG")) {
 287                 return LTTNG_LOGLEVEL_EMERG;
 288         } else if (!strcmp(str, "TRACE_ALERT") || !strcmp(str, "ALERT")) {
 289                 return LTTNG_LOGLEVEL_ALERT;
 290         } else if (!strcmp(str, "TRACE_CRIT") || !strcmp(str, "CRIT")) {
 291                 return LTTNG_LOGLEVEL_CRIT;
 292         } else if (!strcmp(str, "TRACE_ERR") || !strcmp(str, "ERR")) {
 293                 return LTTNG_LOGLEVEL_ERR;
 294         } else if (!strcmp(str, "TRACE_WARNING") || !strcmp(str, "WARNING")) {
 295                 return LTTNG_LOGLEVEL_WARNING;
 296         } else if (!strcmp(str, "TRACE_NOTICE") || !strcmp(str, "NOTICE")) {
 297                 return LTTNG_LOGLEVEL_NOTICE;
 298         } else if (!strcmp(str, "TRACE_INFO") || !strcmp(str, "INFO")) {
 299                 return LTTNG_LOGLEVEL_INFO;
 300         } else if (!strcmp(str, "TRACE_DEBUG_SYSTEM") || !strcmp(str, "DEBUG_SYSTEM") || !strcmp(str, "SYSTEM")) {
 301                 return LTTNG_LOGLEVEL_DEBUG_SYSTEM;
 302         } else if (!strcmp(str, "TRACE_DEBUG_PROGRAM") || !strcmp(str, "DEBUG_PROGRAM") || !strcmp(str, "PROGRAM")) {
 303                 return LTTNG_LOGLEVEL_DEBUG_PROGRAM;
 304         } else if (!strcmp(str, "TRACE_DEBUG_PROCESS") || !strcmp(str, "DEBUG_PROCESS") || !strcmp(str, "PROCESS")) {
 305                 return LTTNG_LOGLEVEL_DEBUG_PROCESS;
 306         } else if (!strcmp(str, "TRACE_DEBUG_MODULE") || !strcmp(str, "DEBUG_MODULE") || !strcmp(str, "MODULE")) {
 307                 return LTTNG_LOGLEVEL_DEBUG_MODULE;
 308         } else if (!strcmp(str, "TRACE_DEBUG_UNIT") || !strcmp(str, "DEBUG_UNIT") || !strcmp(str, "UNIT")) {
 309                 return LTTNG_LOGLEVEL_DEBUG_UNIT;
 310         } else if (!strcmp(str, "TRACE_DEBUG_FUNCTION") || !strcmp(str, "DEBUG_FUNCTION") || !strcmp(str, "FUNCTION")) {
 311                 return LTTNG_LOGLEVEL_DEBUG_FUNCTION;
 312         } else if (!strcmp(str, "TRACE_DEBUG_LINE") || !strcmp(str, "DEBUG_LINE") || !strcmp(str, "LINE")) {
 313                 return LTTNG_LOGLEVEL_DEBUG_LINE;
 314         } else if (!strcmp(str, "TRACE_DEBUG") || !strcmp(str, "DEBUG")) {
 315                 return LTTNG_LOGLEVEL_DEBUG;
 316         } else {
 317                 return -1;
 318         }
 319 }
 320
 321 static
 322 const char *print_channel_name(const char *name)
 323 {
 324         return name ? : DEFAULT_CHANNEL_NAME;
 325 }
 326
 327 static
 328 const char *print_raw_channel_name(const char *name)
 329 {
 330         return name ? : "<default>";
 331 }
 332
 333 /*
 334  * Enabling event using the lttng API.
 335  */
 336 static int enable_events(char *session_name)
 337 {
 338         int ret = CMD_SUCCESS, warn = 0;
 339         char *event_name, *channel_name = NULL;
 340         struct lttng_event ev;
 341         struct lttng_domain dom;
 342
 343         memset(&ev, 0, sizeof(ev));
 344         memset(&dom, 0, sizeof(dom));
 345
 346         if (opt_kernel) {
 347                 if (opt_filter) {
 348                         ERR("Filter not implement for kernel tracing yet");
 349                         ret = CMD_ERROR;
 350                         goto error;
 351                 }
 352                 if (opt_loglevel) {
 353                         WARN("Kernel loglevels are not supported.");
 354                 }
 355         }
 356
 357         /* Create lttng domain */
 358         if (opt_kernel) {
 359                 dom.type = LTTNG_DOMAIN_KERNEL;
 360                 dom.buf_type = LTTNG_BUFFER_GLOBAL;
 361         } else if (opt_userspace) {
 362                 dom.type = LTTNG_DOMAIN_UST;
 363                 /* Default. */
 364                 dom.buf_type = LTTNG_BUFFER_PER_UID;
 365         } else if (opt_jul) {
 366                 dom.type = LTTNG_DOMAIN_JUL;
 367                 /* Default. */
 368                 dom.buf_type = LTTNG_BUFFER_PER_UID;
 369         } else {
 370                 print_missing_domain();
 371                 ret = CMD_ERROR;
 372                 goto error;
 373         }
 374
 375         channel_name = opt_channel_name;
 376
 377         handle = lttng_create_handle(session_name, &dom);
 378         if (handle == NULL) {
 379                 ret = -1;
 380                 goto error;
 381         }
 382
 383         if (opt_enable_all) {
 384                 /* Default setup for enable all */
 385                 if (opt_kernel) {
 386                         ev.type = opt_event_type;
 387                         ev.name[0] = '\0';
 388                         /* kernel loglevels not implemented */
 389                         ev.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
 390                 } else {
 391                         ev.type = LTTNG_EVENT_TRACEPOINT;
 392                         strcpy(ev.name, "*");
 393                         ev.loglevel_type = opt_loglevel_type;
 394                         if (opt_loglevel) {
 395                                 ev.loglevel = loglevel_str_to_value(opt_loglevel);
 396                                 if (ev.loglevel == -1) {
 397                                         ERR("Unknown loglevel %s", opt_loglevel);
 398                                         ret = -LTTNG_ERR_INVALID;
 399                                         goto error;
 400                                 }
 401                         } else {
 402                                 ev.loglevel = -1;
 403                         }
 404                 }
 405
 406                 if (!opt_filter) {
 407                         ret = lttng_enable_event(handle, &ev, channel_name);
 408                         if (ret < 0) {
 409                                 switch (-ret) {
 410                                 case LTTNG_ERR_KERN_EVENT_EXIST:
 411                                         WARN("Kernel events already enabled (channel %s, session %s)",
 412                                                         print_channel_name(channel_name), session_name);
 413                                         break;
 414                                 default:
 415                                         ERR("Events: %s (channel %s, session %s)",
 416                                                         lttng_strerror(ret),
 417                                                         ret == -LTTNG_ERR_NEED_CHANNEL_NAME
 418                                                                 ? print_raw_channel_name(channel_name)
 419                                                                 : print_channel_name(channel_name),
 420                                                         session_name);
 421                                         break;
 422                                 }
 423                                 goto end;
 424                         }
 425
 426                         switch (opt_event_type) {
 427                         case LTTNG_EVENT_TRACEPOINT:
 428                                 if (opt_loglevel && dom.type != LTTNG_DOMAIN_KERNEL) {
 429                                         MSG("All %s tracepoints are enabled in channel %s for loglevel %s",
 430                                                         get_domain_str(dom.type),
 431                                                         print_channel_name(channel_name),
 432                                                         opt_loglevel);
 433                                 } else {
 434                                         MSG("All %s tracepoints are enabled in channel %s",
 435                                                         get_domain_str(dom.type),
 436                                                         print_channel_name(channel_name));
 437                                 }
 438                                 break;
 439                         case LTTNG_EVENT_SYSCALL:
 440                                 if (opt_kernel) {
 441                                         MSG("All kernel system calls are enabled in channel %s",
 442                                                         print_channel_name(channel_name));
 443                                 }
 444                                 break;
 445                         case LTTNG_EVENT_ALL:
 446                                 if (opt_loglevel && dom.type != LTTNG_DOMAIN_KERNEL) {
 447                                         MSG("All %s events are enabled in channel %s for loglevel %s",
 448                                                         get_domain_str(dom.type),
 449                                                         print_channel_name(channel_name),
 450                                                         opt_loglevel);
 451                                 } else {
 452                                         MSG("All %s events are enabled in channel %s",
 453                                                         get_domain_str(dom.type),
 454                                                         print_channel_name(channel_name));
 455                                 }
 456                                 break;
 457                         default:
 458                                 /*
 459                                  * We should not be here since lttng_enable_event should have
 460                                  * failed on the event type.
 461                                  */
 462                                 goto error;
 463                         }
 464                 }
 465                 if (opt_filter) {
 466                         ret = lttng_enable_event_with_filter(handle, &ev, channel_name,
 467                                                 opt_filter);
 468                         if (ret < 0) {
 469                                 switch (-ret) {
 470                                 case LTTNG_ERR_FILTER_EXIST:
 471                                         WARN("Filter on all events is already enabled"
 472                                                         " (channel %s, session %s)",
 473                                                 print_channel_name(channel_name), session_name);
 474                                         break;
 475                                 default:
 476                                         ERR("All events: %s (channel %s, session %s, filter \'%s\')",
 477                                                         lttng_strerror(ret),
 478                                                         ret == -LTTNG_ERR_NEED_CHANNEL_NAME
 479                                                                 ? print_raw_channel_name(channel_name)
 480                                                                 : print_channel_name(channel_name),
 481                                                         session_name, opt_filter);
 482                                         break;
 483                                 }
 484                                 goto error;
 485                         } else {
 486                                 MSG("Filter '%s' successfully set", opt_filter);
 487                         }
 488                 }
 489                 goto end;
 490         }
 491
 492         /* Strip event list */
 493         event_name = strtok(opt_event_list, ",");
 494         while (event_name != NULL) {
 495                 /* Copy name and type of the event */
 496                 strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
 497                 ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 498                 ev.type = opt_event_type;
 499
 500                 /* Kernel tracer action */
 501                 if (opt_kernel) {
 502                         DBG("Enabling kernel event %s for channel %s",
 503                                         event_name,
 504                                         print_channel_name(channel_name));
 505
 506                         switch (opt_event_type) {
 507                         case LTTNG_EVENT_ALL:   /* Default behavior is tracepoint */
 508                                 ev.type = LTTNG_EVENT_TRACEPOINT;
 509                                 /* Fall-through */
 510                         case LTTNG_EVENT_TRACEPOINT:
 511                                 break;
 512                         case LTTNG_EVENT_PROBE:
 513                                 ret = parse_probe_opts(&ev, opt_probe);
 514                                 if (ret < 0) {
 515                                         ERR("Unable to parse probe options");
 516                                         ret = 0;
 517                                         goto error;
 518                                 }
 519                                 break;
 520                         case LTTNG_EVENT_FUNCTION:
 521                                 ret = parse_probe_opts(&ev, opt_function);
 522                                 if (ret < 0) {
 523                                         ERR("Unable to parse function probe options");
 524                                         ret = 0;
 525                                         goto error;
 526                                 }
 527                                 break;
 528                         case LTTNG_EVENT_FUNCTION_ENTRY:
 529                                 strncpy(ev.attr.ftrace.symbol_name, opt_function_entry_symbol,
 530                                                 LTTNG_SYMBOL_NAME_LEN);
 531                                 ev.attr.ftrace.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 532                                 break;
 533                         case LTTNG_EVENT_SYSCALL:
 534                                 MSG("per-syscall selection not supported yet. Use \"-a\" "
 535                                                 "for all syscalls.");
 536                         default:
 537                                 ret = CMD_UNDEFINED;
 538                                 goto error;
 539                         }
 540
 541                         /* kernel loglevels not implemented */
 542                         ev.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
 543                 } else if (opt_userspace) {             /* User-space tracer action */
 544 #if 0
 545                         if (opt_cmd_name != NULL || opt_pid) {
 546                                 MSG("Only supporting tracing all UST processes (-u) for now.");
 547                                 ret = CMD_UNDEFINED;
 548                                 goto error;
 549                         }
 550 #endif
 551
 552                         DBG("Enabling UST event %s for channel %s, loglevel %s", event_name,
 553                                         print_channel_name(channel_name), opt_loglevel ? : "<all>");
 554
 555                         switch (opt_event_type) {
 556                         case LTTNG_EVENT_ALL:   /* Default behavior is tracepoint */
 557                                 /* Fall-through */
 558                         case LTTNG_EVENT_TRACEPOINT:
 559                                 /* Copy name and type of the event */
 560                                 ev.type = LTTNG_EVENT_TRACEPOINT;
 561                                 strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
 562                                 ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 563                                 break;
 564                         case LTTNG_EVENT_PROBE:
 565                         case LTTNG_EVENT_FUNCTION:
 566                         case LTTNG_EVENT_FUNCTION_ENTRY:
 567                         case LTTNG_EVENT_SYSCALL:
 568                         default:
 569                                 ERR("Event type not available for user-space tracing");
 570                                 ret = CMD_UNSUPPORTED;
 571                                 goto error;
 572                         }
 573
 574                         ev.loglevel_type = opt_loglevel_type;
 575                         if (opt_loglevel) {
 576                                 ev.loglevel = loglevel_str_to_value(opt_loglevel);
 577                                 if (ev.loglevel == -1) {
 578                                         ERR("Unknown loglevel %s", opt_loglevel);
 579                                         ret = -LTTNG_ERR_INVALID;
 580                                         goto error;
 581                                 }
 582                         } else {
 583                                 ev.loglevel = -1;
 584                         }
 585                 } else if (opt_jul) {
 586                         if (opt_event_type != LTTNG_EVENT_ALL &&
 587                                         opt_event_type != LTTNG_EVENT_TRACEPOINT) {
 588                                 ERR("Event type not supported for JUL domain.");
 589                                 ret = CMD_UNSUPPORTED;
 590                                 goto error;
 591                         }
 592                         ev.type = LTTNG_EVENT_TRACEPOINT;
 593                         strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
 594                         ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 595                 } else {
 596                         print_missing_domain();
 597                         ret = CMD_ERROR;
 598                         goto error;
 599                 }
 600
 601                 if (!opt_filter) {
 602                         ret = lttng_enable_event(handle, &ev, channel_name);
 603                         if (ret < 0) {
 604                                 /* Turn ret to positive value to handle the positive error code */
 605                                 switch (-ret) {
 606                                 case LTTNG_ERR_KERN_EVENT_EXIST:
 607                                         WARN("Kernel event %s already enabled (channel %s, session %s)",
 608                                                         event_name,
 609                                                         print_channel_name(channel_name), session_name);
 610                                         break;
 611                                 default:
 612                                         ERR("Event %s: %s (channel %s, session %s)", event_name,
 613                                                         lttng_strerror(ret),
 614                                                         ret == -LTTNG_ERR_NEED_CHANNEL_NAME
 615                                                                 ? print_raw_channel_name(channel_name)
 616                                                                 : print_channel_name(channel_name),
 617                                                         session_name);
 618                                         break;
 619                                 }
 620                                 warn = 1;
 621                         } else {
 622                                 MSG("%s event %s created in channel %s",
 623                                                 get_domain_str(dom.type), event_name,
 624                                                 print_channel_name(channel_name));
 625                         }
 626                 }
 627
 628                 if (opt_filter) {
 629                         ret = lttng_enable_event_with_filter(handle, &ev, channel_name,
 630                                         opt_filter);
 631                         if (ret < 0) {
 632                                 switch (-ret) {
 633                                 case LTTNG_ERR_FILTER_EXIST:
 634                                         WARN("Filter on event %s is already enabled"
 635                                                         " (channel %s, session %s)",
 636                                                 event_name,
 637                                                 print_channel_name(channel_name), session_name);
 638                                         break;
 639                                 default:
 640                                         ERR("Event %s: %s (channel %s, session %s, filter \'%s\')", ev.name,
 641                                                         lttng_strerror(ret),
 642                                                         ret == -LTTNG_ERR_NEED_CHANNEL_NAME
 643                                                                 ? print_raw_channel_name(channel_name)
 644                                                                 : print_channel_name(channel_name),
 645                                                         session_name, opt_filter);
 646                                         break;
 647                                 }
 648                                 goto error;
 649                         } else {
 650                                 MSG("Filter '%s' successfully set", opt_filter);
 651                         }
 652                 }
 653
 654                 /* Next event */
 655                 event_name = strtok(NULL, ",");
 656         }
 657
 658 end:
 659 error:
 660         if (warn) {
 661                 ret = CMD_WARNING;
 662         }
 663         lttng_destroy_handle(handle);
 664
 665         return ret;
 666 }
 667
 668 /*
 669  * Add event to trace session
 670  */
 671 int cmd_enable_events(int argc, const char **argv)
 672 {
 673         int opt, ret = CMD_SUCCESS;
 674         static poptContext pc;
 675         char *session_name = NULL;
 676         int event_type = -1;
 677
 678         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 679         poptReadDefaultConfig(pc, 0);
 680
 681         /* Default event type */
 682         opt_event_type = LTTNG_EVENT_ALL;
 683
 684         while ((opt = poptGetNextOpt(pc)) != -1) {
 685                 switch (opt) {
 686                 case OPT_HELP:
 687                         usage(stdout);
 688                         goto end;
 689                 case OPT_TRACEPOINT:
 690                         opt_event_type = LTTNG_EVENT_TRACEPOINT;
 691                         break;
 692                 case OPT_PROBE:
 693                         opt_event_type = LTTNG_EVENT_PROBE;
 694                         break;
 695                 case OPT_FUNCTION:
 696                         opt_event_type = LTTNG_EVENT_FUNCTION;
 697                         break;
 698                 case OPT_FUNCTION_ENTRY:
 699                         opt_event_type = LTTNG_EVENT_FUNCTION_ENTRY;
 700                         break;
 701                 case OPT_SYSCALL:
 702                         opt_event_type = LTTNG_EVENT_SYSCALL;
 703                         break;
 704                 case OPT_USERSPACE:
 705                         opt_userspace = 1;
 706                         break;
 707                 case OPT_LOGLEVEL:
 708                         opt_loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
 709                         opt_loglevel = poptGetOptArg(pc);
 710                         break;
 711                 case OPT_LOGLEVEL_ONLY:
 712                         opt_loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
 713                         opt_loglevel = poptGetOptArg(pc);
 714                         break;
 715                 case OPT_LIST_OPTIONS:
 716                         list_cmd_options(stdout, long_options);
 717                         goto end;
 718                 case OPT_FILTER:
 719                         break;
 720                 case OPT_EXCLUDE:
 721                         break;
 722                 default:
 723                         usage(stderr);
 724                         ret = CMD_UNDEFINED;
 725                         goto end;
 726                 }
 727
 728                 /* Validate event type. Multiple event type are not supported. */
 729                 if (event_type == -1) {
 730                         event_type = opt_event_type;
 731                 } else {
 732                         if (event_type != opt_event_type) {
 733                                 ERR("Multiple event type not supported.");
 734                                 ret = CMD_ERROR;
 735                                 goto end;
 736                         }
 737                 }
 738         }
 739
 740         opt_event_list = (char*) poptGetArg(pc);
 741         if (opt_event_list == NULL && opt_enable_all == 0) {
 742                 ERR("Missing event name(s).\n");
 743                 usage(stderr);
 744                 ret = CMD_ERROR;
 745                 goto end;
 746         }
 747
 748         if (!opt_session_name) {
 749                 session_name = get_session_name();
 750                 if (session_name == NULL) {
 751                         ret = CMD_ERROR;
 752                         goto end;
 753                 }
 754         } else {
 755                 session_name = opt_session_name;
 756         }
 757
 758         ret = enable_events(session_name);
 759
 760 end:
 761         if (opt_session_name == NULL) {
 762                 free(session_name);
 763         }
 764
 765         poptFreeContext(pc);
 766         return ret;
 767 }