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