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_enable_all;
  40 static char *opt_probe;
  41 static char *opt_function;
  42 static char *opt_function_entry_symbol;
  43 static char *opt_channel_name;
  44 static char *opt_filter;
  45 #if 0
  46 /* Not implemented yet */
  47 static char *opt_cmd_name;
  48 static pid_t opt_pid;
  49 #endif
  50
  51 enum {
  52         OPT_HELP = 1,
  53         OPT_TRACEPOINT,
  54         OPT_PROBE,
  55         OPT_FUNCTION,
  56         OPT_FUNCTION_ENTRY,
  57         OPT_SYSCALL,
  58         OPT_USERSPACE,
  59         OPT_LOGLEVEL,
  60         OPT_LOGLEVEL_ONLY,
  61         OPT_LIST_OPTIONS,
  62         OPT_FILTER,
  63 };
  64
  65 static struct lttng_handle *handle;
  66
  67 static struct poptOption long_options[] = {
  68         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  69         {"help",           'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
  70         {"session",        's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
  71         {"all",            'a', POPT_ARG_VAL, &opt_enable_all, 1, 0, 0},
  72         {"channel",        'c', POPT_ARG_STRING, &opt_channel_name, 0, 0, 0},
  73         {"kernel",         'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
  74 #if 0
  75         /* Not implemented yet */
  76         {"userspace",      'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, &opt_cmd_name, OPT_USERSPACE, 0, 0},
  77         {"pid",            'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
  78 #else
  79         {"userspace",      'u', POPT_ARG_NONE, 0, OPT_USERSPACE, 0, 0},
  80 #endif
  81         {"tracepoint",     0,   POPT_ARG_NONE, 0, OPT_TRACEPOINT, 0, 0},
  82         {"probe",          0,   POPT_ARG_STRING, &opt_probe, OPT_PROBE, 0, 0},
  83         {"function",       0,   POPT_ARG_STRING, &opt_function, OPT_FUNCTION, 0, 0},
  84 #if 0
  85         /*
  86          * Currently removed from lttng kernel tracer. Removed from
  87          * lttng UI to discourage its use.
  88          */
  89         {"function:entry", 0,   POPT_ARG_STRING, &opt_function_entry_symbol, OPT_FUNCTION_ENTRY, 0, 0},
  90 #endif
  91         {"syscall",        0,   POPT_ARG_NONE, 0, OPT_SYSCALL, 0, 0},
  92         {"loglevel",       0,     POPT_ARG_STRING, 0, OPT_LOGLEVEL, 0, 0},
  93         {"loglevel-only",  0,     POPT_ARG_STRING, 0, OPT_LOGLEVEL_ONLY, 0, 0},
  94         {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
  95         {"filter",         'f', POPT_ARG_STRING, &opt_filter, OPT_FILTER, 0, 0},
  96         {0, 0, 0, 0, 0, 0, 0}
  97 };
  98
  99 /*
 100  * usage
 101  */
 102 static void usage(FILE *ofp)
 103 {
 104         fprintf(ofp, "usage: lttng enable-event NAME[,NAME2,...] [options] [event_options]\n");
 105         fprintf(ofp, "\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            Apply to session name\n");
 109         fprintf(ofp, "  -c, --channel            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 #if 0
 113         fprintf(ofp, "  -u, --userspace [CMD]    Apply to the user-space tracer\n");
 114         fprintf(ofp, "                           If no CMD, the domain used is UST global\n");
 115         fprintf(ofp, "                           or else the domain is UST EXEC_NAME\n");
 116         fprintf(ofp, "  -p, --pid PID            If -u, apply to specific PID (domain: UST PID)\n");
 117 #else
 118         fprintf(ofp, "  -u, --userspace          Apply to the user-space tracer\n");
 119 #endif
 120         fprintf(ofp, "\n");
 121         fprintf(ofp, "Event options:\n");
 122         fprintf(ofp, "    --tracepoint           Tracepoint event (default)\n");
 123         fprintf(ofp, "                           - userspace tracer supports wildcards at end of string.\n");
 124         fprintf(ofp, "                             Don't forget to quote to deal with bash expansion.\n");
 125         fprintf(ofp, "                             e.g.:\n");
 126         fprintf(ofp, "                               \"*\"\n");
 127         fprintf(ofp, "                               \"app_component:na*\"\n");
 128         fprintf(ofp, "    --probe [addr | symbol | symbol+offset]\n");
 129         fprintf(ofp, "                           Dynamic probe.\n");
 130         fprintf(ofp, "                           Addr and offset can be octal (0NNN...),\n");
 131         fprintf(ofp, "                           decimal (NNN...) or hexadecimal (0xNNN...)\n");
 132         fprintf(ofp, "    --function [addr | symbol | symbol+offset]\n");
 133         fprintf(ofp, "                           Dynamic function entry/return probe.\n");
 134         fprintf(ofp, "                           Addr and offset can be octal (0NNN...),\n");
 135         fprintf(ofp, "                           decimal (NNN...) or hexadecimal (0xNNN...)\n");
 136 #if 0
 137         fprintf(ofp, "    --function:entry symbol\n");
 138         fprintf(ofp, "                           Function tracer event\n");
 139 #endif
 140         fprintf(ofp, "    --syscall              System call event\n");
 141         fprintf(ofp, "\n");
 142         fprintf(ofp, "    --loglevel name\n");
 143         fprintf(ofp, "                           Tracepoint loglevel range from 0 to loglevel\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, "    --filter \'expression\'\n");
 169         fprintf(ofp, "                           Filter expression on event fields,\n");
 170         fprintf(ofp, "                           event recording depends on evaluation.\n");
 171         fprintf(ofp, "\n");
 172 }
 173
 174 /*
 175  * Parse probe options.
 176  */
 177 static int parse_probe_opts(struct lttng_event *ev, char *opt)
 178 {
 179         int ret;
 180         char s_hex[19];
 181         char name[LTTNG_SYMBOL_NAME_LEN];
 182
 183         if (opt == NULL) {
 184                 ret = -1;
 185                 goto end;
 186         }
 187
 188         /* Check for symbol+offset */
 189         ret = sscanf(opt, "%[^'+']+%s", name, s_hex);
 190         if (ret == 2) {
 191                 strncpy(ev->attr.probe.symbol_name, name, LTTNG_SYMBOL_NAME_LEN);
 192                 ev->attr.probe.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 193                 DBG("probe symbol %s", ev->attr.probe.symbol_name);
 194                 if (strlen(s_hex) == 0) {
 195                         ERR("Invalid probe offset %s", s_hex);
 196                         ret = -1;
 197                         goto end;
 198                 }
 199                 ev->attr.probe.offset = strtoul(s_hex, NULL, 0);
 200                 DBG("probe offset %" PRIu64, ev->attr.probe.offset);
 201                 ev->attr.probe.addr = 0;
 202                 goto end;
 203         }
 204
 205         /* Check for symbol */
 206         if (isalpha(name[0])) {
 207                 ret = sscanf(opt, "%s", name);
 208                 if (ret == 1) {
 209                         strncpy(ev->attr.probe.symbol_name, name, LTTNG_SYMBOL_NAME_LEN);
 210                         ev->attr.probe.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 211                         DBG("probe symbol %s", ev->attr.probe.symbol_name);
 212                         ev->attr.probe.offset = 0;
 213                         DBG("probe offset %" PRIu64, ev->attr.probe.offset);
 214                         ev->attr.probe.addr = 0;
 215                         goto end;
 216                 }
 217         }
 218
 219         /* Check for address */
 220         ret = sscanf(opt, "%s", s_hex);
 221         if (ret > 0) {
 222                 if (strlen(s_hex) == 0) {
 223                         ERR("Invalid probe address %s", s_hex);
 224                         ret = -1;
 225                         goto end;
 226                 }
 227                 ev->attr.probe.addr = strtoul(s_hex, NULL, 0);
 228                 DBG("probe addr %" PRIu64, ev->attr.probe.addr);
 229                 ev->attr.probe.offset = 0;
 230                 memset(ev->attr.probe.symbol_name, 0, LTTNG_SYMBOL_NAME_LEN);
 231                 goto end;
 232         }
 233
 234         /* No match */
 235         ret = -1;
 236
 237 end:
 238         return ret;
 239 }
 240
 241 /*
 242  * Maps loglevel from string to value
 243  */
 244 static
 245 int loglevel_str_to_value(const char *inputstr)
 246 {
 247         int i = 0;
 248         char str[LTTNG_SYMBOL_NAME_LEN];
 249
 250         while (inputstr[i] != '\0' && i < LTTNG_SYMBOL_NAME_LEN) {
 251                 str[i] = toupper(inputstr[i]);
 252                 i++;
 253         }
 254         str[i] = '\0';
 255         if (!strcmp(str, "TRACE_EMERG") || !strcmp(str, "EMERG")) {
 256                 return LTTNG_LOGLEVEL_EMERG;
 257         } else if (!strcmp(str, "TRACE_ALERT") || !strcmp(str, "ALERT")) {
 258                 return LTTNG_LOGLEVEL_ALERT;
 259         } else if (!strcmp(str, "TRACE_CRIT") || !strcmp(str, "CRIT")) {
 260                 return LTTNG_LOGLEVEL_CRIT;
 261         } else if (!strcmp(str, "TRACE_ERR") || !strcmp(str, "ERR")) {
 262                 return LTTNG_LOGLEVEL_ERR;
 263         } else if (!strcmp(str, "TRACE_WARNING") || !strcmp(str, "WARNING")) {
 264                 return LTTNG_LOGLEVEL_WARNING;
 265         } else if (!strcmp(str, "TRACE_NOTICE") || !strcmp(str, "NOTICE")) {
 266                 return LTTNG_LOGLEVEL_NOTICE;
 267         } else if (!strcmp(str, "TRACE_INFO") || !strcmp(str, "INFO")) {
 268                 return LTTNG_LOGLEVEL_INFO;
 269         } else if (!strcmp(str, "TRACE_DEBUG_SYSTEM") || !strcmp(str, "DEBUG_SYSTEM") || !strcmp(str, "SYSTEM")) {
 270                 return LTTNG_LOGLEVEL_DEBUG_SYSTEM;
 271         } else if (!strcmp(str, "TRACE_DEBUG_PROGRAM") || !strcmp(str, "DEBUG_PROGRAM") || !strcmp(str, "PROGRAM")) {
 272                 return LTTNG_LOGLEVEL_DEBUG_PROGRAM;
 273         } else if (!strcmp(str, "TRACE_DEBUG_PROCESS") || !strcmp(str, "DEBUG_PROCESS") || !strcmp(str, "PROCESS")) {
 274                 return LTTNG_LOGLEVEL_DEBUG_PROCESS;
 275         } else if (!strcmp(str, "TRACE_DEBUG_MODULE") || !strcmp(str, "DEBUG_MODULE") || !strcmp(str, "MODULE")) {
 276                 return LTTNG_LOGLEVEL_DEBUG_MODULE;
 277         } else if (!strcmp(str, "TRACE_DEBUG_UNIT") || !strcmp(str, "DEBUG_UNIT") || !strcmp(str, "UNIT")) {
 278                 return LTTNG_LOGLEVEL_DEBUG_UNIT;
 279         } else if (!strcmp(str, "TRACE_DEBUG_FUNCTION") || !strcmp(str, "DEBUG_FUNCTION") || !strcmp(str, "FUNCTION")) {
 280                 return LTTNG_LOGLEVEL_DEBUG_FUNCTION;
 281         } else if (!strcmp(str, "TRACE_DEBUG_LINE") || !strcmp(str, "DEBUG_LINE") || !strcmp(str, "LINE")) {
 282                 return LTTNG_LOGLEVEL_DEBUG_LINE;
 283         } else if (!strcmp(str, "TRACE_DEBUG") || !strcmp(str, "DEBUG")) {
 284                 return LTTNG_LOGLEVEL_DEBUG;
 285         } else {
 286                 return -1;
 287         }
 288 }
 289
 290 /*
 291  * Enabling event using the lttng API.
 292  */
 293 static int enable_events(char *session_name)
 294 {
 295         int err, ret = CMD_SUCCESS, warn = 0;
 296         char *event_name, *channel_name = NULL;
 297         struct lttng_event ev;
 298         struct lttng_domain dom;
 299
 300         memset(&ev, 0, sizeof(ev));
 301         memset(&dom, 0, sizeof(dom));
 302
 303         if (opt_kernel) {
 304                 if (opt_filter) {
 305                         ERR("Filter not implement for kernel tracing yet");
 306                         ret = CMD_ERROR;
 307                         goto error;
 308                 }
 309         }
 310
 311         /* Create lttng domain */
 312         if (opt_kernel) {
 313                 dom.type = LTTNG_DOMAIN_KERNEL;
 314         } else if (opt_userspace) {
 315                 dom.type = LTTNG_DOMAIN_UST;
 316         } else {
 317                 ERR("Please specify a tracer (-k/--kernel or -u/--userspace)");
 318                 ret = CMD_ERROR;
 319                 goto error;
 320         }
 321
 322         if (opt_channel_name == NULL) {
 323                 err = asprintf(&channel_name, DEFAULT_CHANNEL_NAME);
 324                 if (err < 0) {
 325                         ret = CMD_FATAL;
 326                         goto error;
 327                 }
 328         } else {
 329                 channel_name = opt_channel_name;
 330         }
 331
 332         handle = lttng_create_handle(session_name, &dom);
 333         if (handle == NULL) {
 334                 ret = -1;
 335                 goto error;
 336         }
 337
 338         if (opt_enable_all) {
 339                 /* Default setup for enable all */
 340                 if (opt_kernel) {
 341                         ev.type = opt_event_type;
 342                         ev.name[0] = '\0';
 343                         /* kernel loglevels not implemented */
 344                         ev.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
 345                 } else {
 346                         ev.type = LTTNG_EVENT_TRACEPOINT;
 347                         strcpy(ev.name, "*");
 348                         ev.loglevel_type = opt_loglevel_type;
 349                         if (opt_loglevel) {
 350                                 ev.loglevel = loglevel_str_to_value(opt_loglevel);
 351                                 if (ev.loglevel == -1) {
 352                                         ERR("Unknown loglevel %s", opt_loglevel);
 353                                         ret = -1;
 354                                         goto error;
 355                                 }
 356                         } else {
 357                                 ev.loglevel = -1;
 358                         }
 359                 }
 360
 361                 ret = lttng_enable_event(handle, &ev, channel_name);
 362                 if (ret < 0) {
 363                         switch (-ret) {
 364                         case LTTCOMM_KERN_EVENT_EXIST:
 365                                 WARN("Kernel events already enabled (channel %s, session %s)",
 366                                                 channel_name, session_name);
 367                                 break;
 368                         default:
 369                                 ERR("Events: %s (channel %s, session %s)",
 370                                                 lttng_strerror(ret), channel_name, session_name);
 371                                 break;
 372                         }
 373                         goto end;
 374                 }
 375                 if (opt_filter) {
 376                         ret = lttng_set_event_filter(handle, ev.name, channel_name,
 377                                                 opt_filter);
 378                         if (ret < 0) {
 379                                 ERR("Error setting filter");
 380                                 ret = -1;
 381                                 goto error;
 382                         }
 383                 }
 384
 385                 switch (opt_event_type) {
 386                 case LTTNG_EVENT_TRACEPOINT:
 387                         if (opt_loglevel) {
 388                                 MSG("All %s tracepoints are enabled in channel %s for loglevel %s",
 389                                         opt_kernel ? "kernel" : "UST", channel_name,
 390                                         opt_loglevel);
 391                         } else {
 392                                 MSG("All %s tracepoints are enabled in channel %s",
 393                                         opt_kernel ? "kernel" : "UST", channel_name);
 394
 395                         }
 396                         break;
 397                 case LTTNG_EVENT_SYSCALL:
 398                         if (opt_kernel) {
 399                                 MSG("All kernel system calls are enabled in channel %s",
 400                                                 channel_name);
 401                         }
 402                         break;
 403                 case LTTNG_EVENT_ALL:
 404                         if (opt_loglevel) {
 405                                 MSG("All %s events are enabled in channel %s for loglevel %s",
 406                                         opt_kernel ? "kernel" : "UST", channel_name,
 407                                         opt_loglevel);
 408                         } else {
 409                                 MSG("All %s events are enabled in channel %s",
 410                                         opt_kernel ? "kernel" : "UST", channel_name);
 411                         }
 412                         break;
 413                 default:
 414                         /*
 415                          * We should not be here since lttng_enable_event should have
 416                          * failed on the event type.
 417                          */
 418                         goto error;
 419                 }
 420                 goto end;
 421         }
 422
 423         /* Strip event list */
 424         event_name = strtok(opt_event_list, ",");
 425         while (event_name != NULL) {
 426                 /* Copy name and type of the event */
 427                 strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
 428                 ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 429                 ev.type = opt_event_type;
 430
 431                 /* Kernel tracer action */
 432                 if (opt_kernel) {
 433                         DBG("Enabling kernel event %s for channel %s",
 434                                         event_name, channel_name);
 435
 436                         switch (opt_event_type) {
 437                         case LTTNG_EVENT_ALL:   /* Default behavior is tracepoint */
 438                                 ev.type = LTTNG_EVENT_TRACEPOINT;
 439                                 /* Fall-through */
 440                         case LTTNG_EVENT_TRACEPOINT:
 441                                 break;
 442                         case LTTNG_EVENT_PROBE:
 443                                 ret = parse_probe_opts(&ev, opt_probe);
 444                                 if (ret < 0) {
 445                                         ERR("Unable to parse probe options");
 446                                         ret = 0;
 447                                         goto error;
 448                                 }
 449                                 break;
 450                         case LTTNG_EVENT_FUNCTION:
 451                                 ret = parse_probe_opts(&ev, opt_function);
 452                                 if (ret < 0) {
 453                                         ERR("Unable to parse function probe options");
 454                                         ret = 0;
 455                                         goto error;
 456                                 }
 457                                 break;
 458                         case LTTNG_EVENT_FUNCTION_ENTRY:
 459                                 strncpy(ev.attr.ftrace.symbol_name, opt_function_entry_symbol,
 460                                                 LTTNG_SYMBOL_NAME_LEN);
 461                                 ev.attr.ftrace.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 462                                 break;
 463                         case LTTNG_EVENT_SYSCALL:
 464                                 MSG("per-syscall selection not supported yet. Use \"-a\" "
 465                                                 "for all syscalls.");
 466                         default:
 467                                 ret = CMD_UNDEFINED;
 468                                 goto error;
 469                         }
 470
 471                         if (opt_loglevel) {
 472                                 MSG("Kernel loglevels are not supported.");
 473                                 ret = CMD_UNDEFINED;
 474                                 goto error;
 475                         }
 476
 477                         /* kernel loglevels not implemented */
 478                         ev.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
 479                 } else if (opt_userspace) {             /* User-space tracer action */
 480 #if 0
 481                         if (opt_cmd_name != NULL || opt_pid) {
 482                                 MSG("Only supporting tracing all UST processes (-u) for now.");
 483                                 ret = CMD_UNDEFINED;
 484                                 goto error;
 485                         }
 486 #endif
 487
 488                         DBG("Enabling UST event %s for channel %s, loglevel %s", event_name,
 489                                         channel_name, opt_loglevel ? : "<all>");
 490
 491                         switch (opt_event_type) {
 492                         case LTTNG_EVENT_ALL:   /* Default behavior is tracepoint */
 493                                 /* Fall-through */
 494                         case LTTNG_EVENT_TRACEPOINT:
 495                                 /* Copy name and type of the event */
 496                                 ev.type = LTTNG_EVENT_TRACEPOINT;
 497                                 strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
 498                                 ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 499                                 break;
 500                         case LTTNG_EVENT_PROBE:
 501                         case LTTNG_EVENT_FUNCTION:
 502                         case LTTNG_EVENT_FUNCTION_ENTRY:
 503                         case LTTNG_EVENT_SYSCALL:
 504                         default:
 505                                 ERR("Event type not available for user-space tracing");
 506                                 ret = CMD_UNDEFINED;
 507                                 goto error;
 508                         }
 509
 510                         ev.loglevel_type = opt_loglevel_type;
 511                         if (opt_loglevel) {
 512                                 ev.loglevel = loglevel_str_to_value(opt_loglevel);
 513                                 if (ev.loglevel == -1) {
 514                                         ERR("Unknown loglevel %s", opt_loglevel);
 515                                         ret = -1;
 516                                         goto error;
 517                                 }
 518                         } else {
 519                                 ev.loglevel = -1;
 520                         }
 521                 } else {
 522                         ERR("Please specify a tracer (-k/--kernel or -u/--userspace)");
 523                         ret = CMD_ERROR;
 524                         goto error;
 525                 }
 526
 527                 ret = lttng_enable_event(handle, &ev, channel_name);
 528                 if (ret < 0) {
 529                         /* Turn ret to positive value to handle the positive error code */
 530                         switch (-ret) {
 531                         case LTTCOMM_KERN_EVENT_EXIST:
 532                                 WARN("Kernel event %s already enabled (channel %s, session %s)",
 533                                                 event_name, channel_name, session_name);
 534                                 break;
 535                         default:
 536                                 ERR("Event %s: %s (channel %s, session %s)", event_name,
 537                                                 lttng_strerror(ret), channel_name, session_name);
 538                                 break;
 539                         }
 540                         warn = 1;
 541                 } else {
 542                         MSG("%s event %s created in channel %s",
 543                                         opt_kernel ? "kernel": "UST", event_name, channel_name);
 544                 }
 545                 if (opt_filter) {
 546                         ret = lttng_set_event_filter(handle, ev.name,
 547                                 channel_name, opt_filter);
 548                         if (ret < 0) {
 549                                 ERR("Error setting filter");
 550                                 ret = -1;
 551                                 goto error;
 552                         }
 553                 }
 554
 555                 /* Next event */
 556                 event_name = strtok(NULL, ",");
 557         }
 558
 559 end:
 560 error:
 561         if (warn) {
 562                 ret = CMD_WARNING;
 563         }
 564         if (opt_channel_name == NULL) {
 565                 free(channel_name);
 566         }
 567         lttng_destroy_handle(handle);
 568
 569         return ret;
 570 }
 571
 572 /*
 573  * Add event to trace session
 574  */
 575 int cmd_enable_events(int argc, const char **argv)
 576 {
 577         int opt, ret = CMD_SUCCESS;
 578         static poptContext pc;
 579         char *session_name = NULL;
 580
 581         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 582         poptReadDefaultConfig(pc, 0);
 583
 584         /* Default event type */
 585         opt_event_type = LTTNG_EVENT_ALL;
 586
 587         while ((opt = poptGetNextOpt(pc)) != -1) {
 588                 switch (opt) {
 589                 case OPT_HELP:
 590                         usage(stdout);
 591                         goto end;
 592                 case OPT_TRACEPOINT:
 593                         opt_event_type = LTTNG_EVENT_TRACEPOINT;
 594                         break;
 595                 case OPT_PROBE:
 596                         opt_event_type = LTTNG_EVENT_PROBE;
 597                         break;
 598                 case OPT_FUNCTION:
 599                         opt_event_type = LTTNG_EVENT_FUNCTION;
 600                         break;
 601                 case OPT_FUNCTION_ENTRY:
 602                         opt_event_type = LTTNG_EVENT_FUNCTION_ENTRY;
 603                         break;
 604                 case OPT_SYSCALL:
 605                         opt_event_type = LTTNG_EVENT_SYSCALL;
 606                         break;
 607                 case OPT_USERSPACE:
 608                         opt_userspace = 1;
 609                         break;
 610                 case OPT_LOGLEVEL:
 611                         opt_loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
 612                         opt_loglevel = poptGetOptArg(pc);
 613                         break;
 614                 case OPT_LOGLEVEL_ONLY:
 615                         opt_loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
 616                         opt_loglevel = poptGetOptArg(pc);
 617                         break;
 618                 case OPT_LIST_OPTIONS:
 619                         list_cmd_options(stdout, long_options);
 620                         goto end;
 621                 case OPT_FILTER:
 622                         break;
 623                 default:
 624                         usage(stderr);
 625                         ret = CMD_UNDEFINED;
 626                         goto end;
 627                 }
 628         }
 629
 630         opt_event_list = (char*) poptGetArg(pc);
 631         if (opt_event_list == NULL && opt_enable_all == 0) {
 632                 ERR("Missing event name(s).\n");
 633                 usage(stderr);
 634                 ret = CMD_ERROR;
 635                 goto end;
 636         }
 637
 638         if (!opt_session_name) {
 639                 session_name = get_session_name();
 640                 if (session_name == NULL) {
 641                         ret = CMD_ERROR;
 642                         goto end;
 643                 }
 644         } else {
 645                 session_name = opt_session_name;
 646         }
 647
 648         ret = enable_events(session_name);
 649
 650 end:
 651         if (opt_session_name == NULL) {
 652                 free(session_name);
 653         }
 654
 655         poptFreeContext(pc);
 656         return ret;
 657 }