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
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; only version 2
   7  * of the License.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  */
  18
  19 #define _GNU_SOURCE
  20 #include <popt.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <sys/stat.h>
  25 #include <sys/types.h>
  26 #include <unistd.h>
  27 #include <inttypes.h>
  28 #include <ctype.h>
  29
  30 #include "../cmd.h"
  31 #include "../conf.h"
  32 #include "../utils.h"
  33
  34 static char *opt_event_list;
  35 static int opt_event_type;
  36 static char *opt_kernel;
  37 static char *opt_cmd_name;
  38 static char *opt_session_name;
  39 static int opt_pid_all;
  40 static int opt_userspace;
  41 static int opt_enable_all;
  42 static pid_t opt_pid;
  43 static char *opt_probe;
  44 static char *opt_function;
  45 static char *opt_function_entry_symbol;
  46 static char *opt_channel_name;
  47
  48 enum {
  49         OPT_HELP = 1,
  50         OPT_USERSPACE,
  51         OPT_TRACEPOINT,
  52         OPT_MARKER,
  53         OPT_PROBE,
  54         OPT_FUNCTION,
  55         OPT_FUNCTION_ENTRY,
  56         OPT_SYSCALL,
  57 };
  58
  59 static struct lttng_handle *handle;
  60
  61 static struct poptOption long_options[] = {
  62         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  63         {"help",           'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
  64         {"session",        's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
  65         {"all-events",     'a', POPT_ARG_VAL, &opt_enable_all, 1, 0, 0},
  66         {"channel",        'c', POPT_ARG_STRING, &opt_channel_name, 0, 0, 0},
  67         {"kernel",         'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
  68         {"userspace",      'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, 0, OPT_USERSPACE, 0, 0},
  69         {"all",            0,   POPT_ARG_VAL, &opt_pid_all, 1, 0, 0},
  70         {"pid",            'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
  71         {"tracepoint",     0,   POPT_ARG_NONE, 0, OPT_TRACEPOINT, 0, 0},
  72         {"marker",         0,   POPT_ARG_NONE, 0, OPT_MARKER, 0, 0},
  73         {"probe",         0,   POPT_ARG_STRING, 0, OPT_PROBE, 0, 0},
  74         {"function",       0,   POPT_ARG_STRING, 0, OPT_FUNCTION, 0, 0},
  75         {"function:entry", 0,   POPT_ARG_STRING, 0, OPT_FUNCTION_ENTRY, 0, 0},
  76         {"syscall",        0,     POPT_ARG_NONE, 0, OPT_SYSCALL, 0, 0},
  77         {0, 0, 0, 0, 0, 0, 0}
  78 };
  79
  80 /*
  81  * usage
  82  */
  83 static void usage(FILE *ofp)
  84 {
  85         fprintf(ofp, "usage: lttng enable-event NAME[,NAME2,...] [options] [event_options]\n");
  86         fprintf(ofp, "\n");
  87         fprintf(ofp, "  -h, --help               Show this help\n");
  88         fprintf(ofp, "  -s, --session            Apply on session name\n");
  89         fprintf(ofp, "  -c, --channel            Apply on this channel\n");
  90         fprintf(ofp, "  -a, --all-events         Enable all tracepoints\n");
  91         fprintf(ofp, "  -k, --kernel             Apply for the kernel tracer\n");
  92         fprintf(ofp, "  -u, --userspace [CMD]    Apply for the user-space tracer\n");
  93         fprintf(ofp, "      --all                If -u, apply on all traceable apps\n");
  94         fprintf(ofp, "  -p, --pid PID            If -u, apply on a specific PID\n");
  95         fprintf(ofp, "\n");
  96         fprintf(ofp, "Event options:\n");
  97         fprintf(ofp, "    --tracepoint           Tracepoint event (default)\n");
  98         fprintf(ofp, "    --probe [addr | symbol | symbol+offset]\n");
  99         fprintf(ofp, "                           Dynamic probe.\n");
 100         fprintf(ofp, "                           Addr and offset can be octal (0NNN...),\n");
 101         fprintf(ofp, "                           decimal (NNN...) or hexadecimal (0xNNN...)\n");
 102         fprintf(ofp, "    --function [addr | symbol | symbol+offset]\n");
 103         fprintf(ofp, "                           Dynamic function entry/return probe.\n");
 104         fprintf(ofp, "                           Addr and offset can be octal (0NNN...),\n");
 105         fprintf(ofp, "                           decimal (NNN...) or hexadecimal (0xNNN...)\n");
 106         fprintf(ofp, "    --function:entry symbol\n");
 107         fprintf(ofp, "                           Function tracer event\n");
 108         fprintf(ofp, "    --syscall              System call event\n");
 109         fprintf(ofp, "    --marker               User-space marker (deprecated)\n");
 110         fprintf(ofp, "\n");
 111 }
 112
 113 /*
 114  *  parse_probe_addr
 115  *
 116  *  Parse probe options.
 117  */
 118 static int parse_probe_opts(struct lttng_event *ev, char *opt)
 119 {
 120         int ret;
 121         char s_hex[19];
 122         char name[LTTNG_SYMBOL_NAME_LEN];
 123
 124         if (opt == NULL) {
 125                 ret = -1;
 126                 goto end;
 127         }
 128
 129         /* Check for symbol+offset */
 130         ret = sscanf(opt, "%[^'+']+%s", name, s_hex);
 131         if (ret == 2) {
 132                 strncpy(ev->attr.probe.symbol_name, name, LTTNG_SYMBOL_NAME_LEN);
 133                 ev->attr.probe.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 134                 DBG("probe symbol %s", ev->attr.probe.symbol_name);
 135                 if (strlen(s_hex) == 0) {
 136                         ERR("Invalid probe offset %s", s_hex);
 137                         ret = -1;
 138                         goto end;
 139                 }
 140                 ev->attr.probe.offset = strtoul(s_hex, NULL, 0);
 141                 DBG("probe offset %" PRIu64, ev->attr.probe.offset);
 142                 ev->attr.probe.addr = 0;
 143                 goto end;
 144         }
 145
 146         /* Check for symbol */
 147         if (isalpha(name[0])) {
 148                 ret = sscanf(opt, "%s", name);
 149                 if (ret == 1) {
 150                         strncpy(ev->attr.probe.symbol_name, name, LTTNG_SYMBOL_NAME_LEN);
 151                         ev->attr.probe.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 152                         DBG("probe symbol %s", ev->attr.probe.symbol_name);
 153                         ev->attr.probe.offset = 0;
 154                         DBG("probe offset %" PRIu64, ev->attr.probe.offset);
 155                         ev->attr.probe.addr = 0;
 156                         goto end;
 157                 }
 158         }
 159
 160         /* Check for address */
 161         ret = sscanf(opt, "%s", s_hex);
 162         if (ret > 0) {
 163                 if (strlen(s_hex) == 0) {
 164                         ERR("Invalid probe address %s", s_hex);
 165                         ret = -1;
 166                         goto end;
 167                 }
 168                 ev->attr.probe.addr = strtoul(s_hex, NULL, 0);
 169                 DBG("probe addr %" PRIu64, ev->attr.probe.addr);
 170                 ev->attr.probe.offset = 0;
 171                 memset(ev->attr.probe.symbol_name, 0, LTTNG_SYMBOL_NAME_LEN);
 172                 goto end;
 173         }
 174
 175         /* No match */
 176         ret = -1;
 177
 178 end:
 179         return ret;
 180 }
 181
 182 /*
 183  *  enable_events
 184  *
 185  *  Enabling event using the lttng API.
 186  */
 187 static int enable_events(char *session_name)
 188 {
 189         int err, ret = CMD_SUCCESS;
 190         char *event_name, *channel_name = NULL;
 191         struct lttng_event ev;
 192         struct lttng_domain dom;
 193
 194         if (opt_channel_name == NULL) {
 195                 err = asprintf(&channel_name, DEFAULT_CHANNEL_NAME);
 196                 if (err < 0) {
 197                         ret = CMD_FATAL;
 198                         goto error;
 199                 }
 200         } else {
 201                 channel_name = opt_channel_name;
 202         }
 203
 204         /* Create lttng domain */
 205         if (opt_kernel) {
 206                 dom.type = LTTNG_DOMAIN_KERNEL;
 207         }
 208
 209         handle = lttng_create_handle(session_name, &dom);
 210         if (handle == NULL) {
 211                 ret = -1;
 212                 goto error;
 213         }
 214
 215         if (opt_enable_all) {
 216                 switch (opt_event_type) {
 217                 case LTTNG_EVENT_TRACEPOINT:
 218                         if (opt_kernel) {
 219                                 ret = lttng_enable_event(handle, NULL, channel_name);
 220                                 if (ret == 0) {
 221                                         MSG("All kernel events are enabled in channel %s", channel_name);
 222                                 }
 223                                 goto error;
 224                         }
 225                         /* TODO: User-space tracer */
 226                         break;
 227                 case LTTNG_EVENT_SYSCALL:
 228                         if (opt_kernel) {
 229                                 ev.name[0] = '\0';
 230                                 ev.type = opt_event_type;
 231
 232                                 ret = lttng_enable_event(handle, &ev, channel_name);
 233                                 if (ret == 0) {
 234                                         MSG("All kernel system calls are enabled in channel %s", channel_name);
 235                                 }
 236                                 goto error;
 237                         }
 238                         break;
 239                 default:
 240                         MSG("Enable all not supported for this instrumentation type.");
 241                         goto error;
 242                 }
 243         }
 244
 245         /* Strip event list */
 246         event_name = strtok(opt_event_list, ",");
 247         while (event_name != NULL) {
 248                 /* Kernel tracer action */
 249                 if (opt_kernel) {
 250                         DBG("Enabling kernel event %s for channel %s",
 251                                         event_name, channel_name);
 252                         /* Copy name and type of the event */
 253                         strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
 254                         ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 255                         ev.type = opt_event_type;
 256
 257                         switch (opt_event_type) {
 258                         case LTTNG_EVENT_TRACEPOINT:
 259                                 break;
 260                         case LTTNG_EVENT_PROBE:
 261                                 ret = parse_probe_opts(&ev, opt_probe);
 262                                 if (ret < 0) {
 263                                         ERR("Unable to parse probe options");
 264                                         ret = 0;
 265                                         goto error;
 266                                 }
 267                                 break;
 268                         case LTTNG_EVENT_FUNCTION:
 269                                 ret = parse_probe_opts(&ev, opt_function);
 270                                 if (ret < 0) {
 271                                         ERR("Unable to parse function probe options");
 272                                         ret = 0;
 273                                         goto error;
 274                                 }
 275                                 break;
 276                         case LTTNG_EVENT_FUNCTION_ENTRY:
 277                                 strncpy(ev.attr.ftrace.symbol_name,
 278                                         opt_function_entry_symbol,
 279                                         LTTNG_SYMBOL_NAME_LEN);
 280                                 ev.attr.ftrace.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 281                                 break;
 282                         case LTTNG_EVENT_SYSCALL:
 283                                 MSG("per-syscall selection not supported yet. Use \"-a\" for all syscalls.");
 284                                 ret = CMD_NOT_IMPLEMENTED;
 285                                 goto error;
 286                         default:
 287                                 ret = CMD_NOT_IMPLEMENTED;
 288                                 goto error;
 289                         }
 290
 291                         ret = lttng_enable_event(handle, &ev, channel_name);
 292                         if (ret == 0) {
 293                                 MSG("Kernel event %s created in channel %s", event_name, channel_name);
 294                         }
 295                 } else if (opt_userspace) {             /* User-space tracer action */
 296                         /*
 297                          * TODO: Waiting on lttng UST 2.0
 298                          */
 299                         if (opt_pid_all) {
 300                         } else if (opt_pid != 0) {
 301                         }
 302                         ret = CMD_NOT_IMPLEMENTED;
 303                         goto error;
 304                 } else {
 305                         ERR("Please specify a tracer (--kernel or --userspace)");
 306                         goto error;
 307                 }
 308
 309                 /* Next event */
 310                 event_name = strtok(NULL, ",");
 311         }
 312
 313 error:
 314         if (opt_channel_name == NULL) {
 315                 free(channel_name);
 316         }
 317         lttng_destroy_handle(handle);
 318
 319         return ret;
 320 }
 321
 322 /*
 323  *  cmd_enable_events
 324  *
 325  *  Add event to trace session
 326  */
 327 int cmd_enable_events(int argc, const char **argv)
 328 {
 329         int opt, ret;
 330         static poptContext pc;
 331         char *session_name = NULL;
 332
 333         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 334         poptReadDefaultConfig(pc, 0);
 335
 336         /* Default event type */
 337         opt_event_type = LTTNG_EVENT_TRACEPOINT;
 338
 339         while ((opt = poptGetNextOpt(pc)) != -1) {
 340                 switch (opt) {
 341                 case OPT_HELP:
 342                         usage(stderr);
 343                         ret = CMD_SUCCESS;
 344                         goto end;
 345                 case OPT_USERSPACE:
 346                         opt_userspace = 1;
 347                         opt_cmd_name = poptGetOptArg(pc);
 348                         break;
 349                 case OPT_TRACEPOINT:
 350                         opt_event_type = LTTNG_EVENT_TRACEPOINT;
 351                         break;
 352                 case OPT_MARKER:
 353                         ret = CMD_NOT_IMPLEMENTED;
 354                         goto end;
 355                 case OPT_PROBE:
 356                         opt_event_type = LTTNG_EVENT_PROBE;
 357                         opt_probe = poptGetOptArg(pc);
 358                         break;
 359                 case OPT_FUNCTION:
 360                         opt_event_type = LTTNG_EVENT_FUNCTION;
 361                         opt_function = poptGetOptArg(pc);
 362                         break;
 363                 case OPT_FUNCTION_ENTRY:
 364                         opt_event_type = LTTNG_EVENT_FUNCTION_ENTRY;
 365                         opt_function_entry_symbol = poptGetOptArg(pc);
 366                         break;
 367                 case OPT_SYSCALL:
 368                         opt_event_type = LTTNG_EVENT_SYSCALL;
 369                         break;
 370                 default:
 371                         usage(stderr);
 372                         ret = CMD_UNDEFINED;
 373                         goto end;
 374                 }
 375         }
 376
 377         opt_event_list = (char*) poptGetArg(pc);
 378         if (opt_event_list == NULL && opt_enable_all == 0) {
 379                 ERR("Missing event name(s).\n");
 380                 usage(stderr);
 381                 ret = CMD_SUCCESS;
 382                 goto end;
 383         }
 384
 385         if (!opt_session_name) {
 386                 session_name = get_session_name();
 387                 if (session_name == NULL) {
 388                         ret = -1;
 389                         goto end;
 390                 }
 391         } else {
 392                 session_name = opt_session_name;
 393         }
 394
 395         ret = enable_events(session_name);
 396
 397 end:
 398         if (opt_session_name == NULL) {
 399                 free(session_name);
 400         }
 401
 402         return ret;
 403 }