src/common/kernel-ctl/kernel-ctl.c

   1 /*
   2  * Copyright (C) 2011 Julien Desfossez <julien.desfossez@polymtl.ca>
   3  * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   4  * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   5  *
   6  * SPDX-License-Identifier: GPL-2.0-only
   7  *
   8  */
   9
  10 #include "lttng/tracker.h"
  11 #define _LGPL_SOURCE
  12 #define __USE_LINUX_IOCTL_DEFS
  13 #include <sys/ioctl.h>
  14 #include <string.h>
  15 #include <common/align.h>
  16 #include <common/macros.h>
  17 #include <common/compat/errno.h>
  18 #include <stdarg.h>
  19 #include <assert.h>
  20 #include <common/time.h>
  21
  22 #include "kernel-ctl.h"
  23 #include "kernel-ioctl.h"
  24
  25 #define LTTNG_IOCTL_CHECK(fildes, request, ...)                         \
  26         ({                                                              \
  27                 int _ioctl_ret = ioctl(fildes, request, ##__VA_ARGS__); \
  28                 assert(_ioctl_ret <= 0);                                \
  29                 !_ioctl_ret ? 0 : -errno;                               \
  30         })
  31
  32 #define LTTNG_IOCTL_NO_CHECK(fildes, request, ...)                      \
  33         ({                                                              \
  34                 int _ioctl_ret = ioctl(fildes, request, ##__VA_ARGS__); \
  35                 _ioctl_ret >= 0 ? _ioctl_ret : -errno;                  \
  36         })
  37
  38 /*
  39  * This flag indicates which version of the kernel ABI to use. The old
  40  * ABI (namespace _old) does not support a 32-bit user-space when the
  41  * kernel is 64-bit. The old ABI is kept here for compatibility but is
  42  * deprecated and will be removed eventually.
  43  */
  44 static int lttng_kernel_abi_use_old_abi = -1;
  45
  46 /*
  47  * Execute the new or old ioctl depending on the ABI version.
  48  * If the ABI version is not determined yet (lttng_kernel_abi_use_old_abi = -1),
  49  * this function tests if the new ABI is available and otherwise fallbacks
  50  * on the old one.
  51  * This function takes the fd on which the ioctl must be executed and the old
  52  * and new request codes.
  53  * It returns the return value of the ioctl executed.
  54  */
  55 static inline int compat_ioctl_no_arg(int fd, unsigned long oldname,
  56                 unsigned long newname)
  57 {
  58         int ret;
  59
  60         if (lttng_kernel_abi_use_old_abi == -1) {
  61                 ret = LTTNG_IOCTL_NO_CHECK(fd, newname);
  62                 if (!ret) {
  63                         lttng_kernel_abi_use_old_abi = 0;
  64                         goto end;
  65                 }
  66                 lttng_kernel_abi_use_old_abi = 1;
  67         }
  68         if (lttng_kernel_abi_use_old_abi) {
  69                 ret = LTTNG_IOCTL_NO_CHECK(fd, oldname);
  70         } else {
  71                 ret = LTTNG_IOCTL_NO_CHECK(fd, newname);
  72         }
  73
  74 end:
  75         return ret;
  76 }
  77
  78 int kernctl_create_session(int fd)
  79 {
  80         return compat_ioctl_no_arg(fd, LTTNG_KERNEL_ABI_OLD_SESSION,
  81                         LTTNG_KERNEL_ABI_SESSION);
  82 }
  83
  84 /* open the metadata global channel */
  85 int kernctl_open_metadata(int fd, struct lttng_channel_attr *chops)
  86 {
  87         struct lttng_kernel_abi_channel channel;
  88
  89         if (lttng_kernel_abi_use_old_abi) {
  90                 struct lttng_kernel_abi_old_channel old_channel;
  91
  92                 memset(&old_channel, 0, sizeof(old_channel));
  93                 old_channel.overwrite = chops->overwrite;
  94                 old_channel.subbuf_size = chops->subbuf_size;
  95                 old_channel.num_subbuf = chops->num_subbuf;
  96                 old_channel.switch_timer_interval = chops->switch_timer_interval;
  97                 old_channel.read_timer_interval = chops->read_timer_interval;
  98                 old_channel.output = chops->output;
  99
 100                 memset(old_channel.padding, 0, sizeof(old_channel.padding));
 101                 /*
 102                  * The new channel padding is smaller than the old ABI so we use the
 103                  * new ABI padding size for the memcpy.
 104                  */
 105                 memcpy(old_channel.padding, chops->padding, sizeof(chops->padding));
 106
 107                 return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_ABI_OLD_METADATA,
 108                                 &old_channel);
 109         }
 110
 111         memset(&channel, 0, sizeof(channel));
 112         channel.overwrite = chops->overwrite;
 113         channel.subbuf_size = chops->subbuf_size;
 114         channel.num_subbuf = chops->num_subbuf;
 115         channel.switch_timer_interval = chops->switch_timer_interval;
 116         channel.read_timer_interval = chops->read_timer_interval;
 117         channel.output = chops->output;
 118         memcpy(channel.padding, chops->padding, sizeof(chops->padding));
 119
 120         return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_ABI_METADATA, &channel);
 121 }
 122
 123 int kernctl_create_channel(int fd, struct lttng_channel_attr *chops)
 124 {
 125         struct lttng_kernel_abi_channel channel;
 126
 127         memset(&channel, 0, sizeof(channel));
 128         if (lttng_kernel_abi_use_old_abi) {
 129                 struct lttng_kernel_abi_old_channel old_channel;
 130
 131                 old_channel.overwrite = chops->overwrite;
 132                 old_channel.subbuf_size = chops->subbuf_size;
 133                 old_channel.num_subbuf = chops->num_subbuf;
 134                 old_channel.switch_timer_interval = chops->switch_timer_interval;
 135                 old_channel.read_timer_interval = chops->read_timer_interval;
 136                 old_channel.output = chops->output;
 137
 138                 memset(old_channel.padding, 0, sizeof(old_channel.padding));
 139                 /*
 140                  * The new channel padding is smaller than the old ABI so we use the
 141                  * new ABI padding size for the memcpy.
 142                  */
 143                 memcpy(old_channel.padding, chops->padding, sizeof(chops->padding));
 144
 145                 return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_ABI_OLD_CHANNEL,
 146                                 &old_channel);
 147         }
 148
 149         channel.overwrite = chops->overwrite;
 150         channel.subbuf_size = chops->subbuf_size;
 151         channel.num_subbuf = chops->num_subbuf;
 152         channel.switch_timer_interval = chops->switch_timer_interval;
 153         channel.read_timer_interval = chops->read_timer_interval;
 154         channel.output = chops->output;
 155         memcpy(channel.padding, chops->padding, sizeof(chops->padding));
 156
 157         return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_ABI_CHANNEL, &channel);
 158 }
 159
 160 int kernctl_syscall_mask(int fd, char **syscall_mask, uint32_t *nr_bits)
 161 {
 162         struct lttng_kernel_abi_syscall_mask kmask_len, *kmask = NULL;
 163         size_t array_alloc_len;
 164         char *new_mask;
 165         int ret = 0;
 166
 167         if (!syscall_mask) {
 168                 ret = -1;
 169                 goto end;
 170         }
 171
 172         if (!nr_bits) {
 173                 ret = -1;
 174                 goto end;
 175         }
 176
 177         kmask_len.len = 0;
 178         ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_SYSCALL_MASK, &kmask_len);
 179         if (ret) {
 180                 goto end;
 181         }
 182
 183         array_alloc_len = ALIGN(kmask_len.len, 8) >> 3;
 184
 185         kmask = zmalloc(sizeof(*kmask) + array_alloc_len);
 186         if (!kmask) {
 187                 ret = -1;
 188                 goto end;
 189         }
 190
 191         kmask->len = kmask_len.len;
 192         ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_SYSCALL_MASK, kmask);
 193         if (ret) {
 194                 goto end;
 195         }
 196
 197         new_mask = realloc(*syscall_mask, array_alloc_len);
 198         if (!new_mask) {
 199                 ret = -1;
 200                 goto end;
 201         }
 202         memcpy(new_mask, kmask->mask, array_alloc_len);
 203         *syscall_mask = new_mask;
 204         *nr_bits = kmask->len;
 205
 206 end:
 207         free(kmask);
 208         return ret;
 209 }
 210
 211 int kernctl_track_pid(int fd, int pid)
 212 {
 213         int ret = LTTNG_IOCTL_CHECK(
 214                         fd, LTTNG_KERNEL_ABI_SESSION_TRACK_PID, pid);
 215
 216         if (ret == -ENOSYS) {
 217                 ret = LTTNG_IOCTL_CHECK(fd,
 218                                 LTTNG_KERNEL_ABI_OLD_SESSION_TRACK_PID, pid);
 219         }
 220
 221         return ret;
 222 }
 223
 224 int kernctl_untrack_pid(int fd, int pid)
 225 {
 226         int ret = LTTNG_IOCTL_CHECK(
 227                         fd, LTTNG_KERNEL_ABI_SESSION_UNTRACK_PID, pid);
 228
 229         if (ret == -ENOSYS) {
 230                 ret = LTTNG_IOCTL_CHECK(fd,
 231                                 LTTNG_KERNEL_ABI_OLD_SESSION_UNTRACK_PID, pid);
 232         }
 233
 234         return ret;
 235 }
 236
 237 int kernctl_list_tracker_pids(int fd)
 238 {
 239         return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_ABI_SESSION_LIST_TRACKER_PIDS);
 240 }
 241
 242 static enum lttng_kernel_abi_tracker_type get_kernel_tracker_type(
 243                 enum lttng_process_attr process_attr)
 244 {
 245         switch (process_attr) {
 246         case LTTNG_PROCESS_ATTR_PROCESS_ID:
 247                 return LTTNG_KERNEL_ABI_TRACKER_PID;
 248         case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID:
 249                 return LTTNG_KERNEL_ABI_TRACKER_VPID;
 250         case LTTNG_PROCESS_ATTR_USER_ID:
 251                 return LTTNG_KERNEL_ABI_TRACKER_UID;
 252         case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID:
 253                 return LTTNG_KERNEL_ABI_TRACKER_VUID;
 254         case LTTNG_PROCESS_ATTR_GROUP_ID:
 255                 return LTTNG_KERNEL_ABI_TRACKER_GID;
 256         case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID:
 257                 return LTTNG_KERNEL_ABI_TRACKER_VGID;
 258         default:
 259                 return LTTNG_KERNEL_ABI_TRACKER_UNKNOWN;
 260         }
 261 }
 262
 263 int kernctl_track_id(int fd, enum lttng_process_attr process_attr, int id)
 264 {
 265         struct lttng_kernel_abi_tracker_args args;
 266         int ret;
 267
 268         args.id = id;
 269         args.type = get_kernel_tracker_type(process_attr);
 270         if (args.type == LTTNG_KERNEL_ABI_TRACKER_UNKNOWN) {
 271                 errno = EINVAL;
 272                 return -1;
 273         }
 274
 275         ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_SESSION_TRACK_ID, &args);
 276         if (ret == -ENOSYS) {
 277                 ret = LTTNG_IOCTL_CHECK(fd,
 278                                 LTTNG_KERNEL_ABI_OLD_SESSION_TRACK_ID, &args);
 279         }
 280
 281         return ret;
 282 }
 283
 284 int kernctl_untrack_id(int fd, enum lttng_process_attr process_attr, int id)
 285 {
 286         struct lttng_kernel_abi_tracker_args args;
 287         int ret;
 288
 289         args.id = id;
 290         args.type = get_kernel_tracker_type(process_attr);
 291         if (args.type == LTTNG_KERNEL_ABI_TRACKER_UNKNOWN) {
 292                 errno = EINVAL;
 293                 return -1;
 294         }
 295
 296         ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_SESSION_UNTRACK_ID, &args);
 297         if (ret == -ENOSYS) {
 298                 ret = LTTNG_IOCTL_CHECK(fd,
 299                                 LTTNG_KERNEL_ABI_OLD_SESSION_UNTRACK_ID, &args);
 300         }
 301
 302         return ret;
 303 }
 304
 305 int kernctl_list_tracker_ids(int fd, enum lttng_process_attr process_attr)
 306 {
 307         struct lttng_kernel_abi_tracker_args args;
 308         int ret;
 309
 310         args.id = -1;
 311         args.type = get_kernel_tracker_type(process_attr);
 312         if (args.type == LTTNG_KERNEL_ABI_TRACKER_UNKNOWN) {
 313                 errno = EINVAL;
 314                 return -1;
 315         }
 316
 317         ret = LTTNG_IOCTL_NO_CHECK(
 318                         fd, LTTNG_KERNEL_ABI_SESSION_LIST_TRACKER_IDS, &args);
 319         if (ret == -ENOSYS) {
 320                 ret = LTTNG_IOCTL_NO_CHECK(fd,
 321                                 LTTNG_KERNEL_ABI_OLD_SESSION_LIST_TRACKER_IDS,
 322                                 &args);
 323         }
 324
 325         return ret;
 326 }
 327
 328 int kernctl_session_regenerate_metadata(int fd)
 329 {
 330         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_SESSION_METADATA_REGEN);
 331 }
 332
 333 int kernctl_session_regenerate_statedump(int fd)
 334 {
 335         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_SESSION_STATEDUMP);
 336 }
 337
 338 int kernctl_session_set_name(int fd, const char *name)
 339 {
 340         int ret;
 341         struct lttng_kernel_abi_session_name session_name;
 342
 343         ret = lttng_strncpy(session_name.name, name, sizeof(session_name.name));
 344         if (ret) {
 345                 goto end;
 346         }
 347
 348         ret = LTTNG_IOCTL_CHECK(
 349                         fd, LTTNG_KERNEL_ABI_SESSION_SET_NAME, &session_name);
 350         if (ret == -ENOSYS) {
 351                 ret = LTTNG_IOCTL_CHECK(fd,
 352                                 LTTNG_KERNEL_ABI_OLD_SESSION_SET_NAME,
 353                                 &session_name);
 354         }
 355
 356 end:
 357         return ret;
 358 }
 359
 360 int kernctl_session_set_creation_time(int fd, time_t time)
 361 {
 362         int ret;
 363         struct lttng_kernel_abi_session_creation_time creation_time;
 364
 365         ret = time_to_iso8601_str(time, creation_time.iso8601,
 366                         sizeof(creation_time.iso8601));
 367         if (ret) {
 368                 goto end;
 369         }
 370
 371         ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_SESSION_SET_CREATION_TIME,
 372                         &creation_time);
 373         if (ret == -ENOSYS) {
 374                 ret = LTTNG_IOCTL_CHECK(fd,
 375                                 LTTNG_KERNEL_ABI_OLD_SESSION_SET_CREATION_TIME,
 376                                 &creation_time);
 377         }
 378
 379 end:
 380         return ret;
 381 }
 382
 383 int kernctl_create_stream(int fd)
 384 {
 385         return compat_ioctl_no_arg(fd, LTTNG_KERNEL_ABI_OLD_STREAM,
 386                         LTTNG_KERNEL_ABI_STREAM);
 387 }
 388
 389 int kernctl_create_event(int fd, struct lttng_kernel_abi_event *ev)
 390 {
 391         if (lttng_kernel_abi_use_old_abi) {
 392                 struct lttng_kernel_abi_old_event old_event;
 393
 394                 memset(&old_event, 0, sizeof(old_event));
 395                 memcpy(old_event.name, ev->name, sizeof(old_event.name));
 396                 old_event.instrumentation = ev->instrumentation;
 397                 switch (ev->instrumentation) {
 398                 case LTTNG_KERNEL_ABI_KPROBE:
 399                         old_event.u.kprobe.addr = ev->u.kprobe.addr;
 400                         old_event.u.kprobe.offset = ev->u.kprobe.offset;
 401                         memcpy(old_event.u.kprobe.symbol_name,
 402                                 ev->u.kprobe.symbol_name,
 403                                 sizeof(old_event.u.kprobe.symbol_name));
 404                         break;
 405                 case LTTNG_KERNEL_ABI_KRETPROBE:
 406                         old_event.u.kretprobe.addr = ev->u.kretprobe.addr;
 407                         old_event.u.kretprobe.offset = ev->u.kretprobe.offset;
 408                         memcpy(old_event.u.kretprobe.symbol_name,
 409                                 ev->u.kretprobe.symbol_name,
 410                                 sizeof(old_event.u.kretprobe.symbol_name));
 411                         break;
 412                 case LTTNG_KERNEL_ABI_FUNCTION:
 413                         memcpy(old_event.u.ftrace.symbol_name,
 414                                         ev->u.ftrace.symbol_name,
 415                                         sizeof(old_event.u.ftrace.symbol_name));
 416                         break;
 417                 default:
 418                         break;
 419                 }
 420
 421                 return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_ABI_OLD_EVENT,
 422                                 &old_event);
 423         }
 424         return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_ABI_EVENT, ev);
 425 }
 426
 427 int kernctl_add_context(int fd, struct lttng_kernel_abi_context *ctx)
 428 {
 429         if (lttng_kernel_abi_use_old_abi) {
 430                 struct lttng_kernel_abi_old_context old_ctx;
 431
 432                 memset(&old_ctx, 0, sizeof(old_ctx));
 433                 old_ctx.ctx = ctx->ctx;
 434                 /* only type that uses the union */
 435                 if (ctx->ctx == LTTNG_KERNEL_ABI_CONTEXT_PERF_CPU_COUNTER) {
 436                         old_ctx.u.perf_counter.type =
 437                                 ctx->u.perf_counter.type;
 438                         old_ctx.u.perf_counter.config =
 439                                 ctx->u.perf_counter.config;
 440                         memcpy(old_ctx.u.perf_counter.name,
 441                                 ctx->u.perf_counter.name,
 442                                 sizeof(old_ctx.u.perf_counter.name));
 443                 }
 444                 return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_OLD_CONTEXT,
 445                                 &old_ctx);
 446         }
 447         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_CONTEXT, ctx);
 448 }
 449
 450
 451 /* Enable event, channel and session LTTNG_IOCTL_CHECK */
 452 int kernctl_enable(int fd)
 453 {
 454         return compat_ioctl_no_arg(fd, LTTNG_KERNEL_ABI_OLD_ENABLE,
 455                         LTTNG_KERNEL_ABI_ENABLE);
 456 }
 457
 458 /* Disable event, channel and session LTTNG_IOCTL_CHECK */
 459 int kernctl_disable(int fd)
 460 {
 461         return compat_ioctl_no_arg(fd, LTTNG_KERNEL_ABI_OLD_DISABLE,
 462                         LTTNG_KERNEL_ABI_DISABLE);
 463 }
 464
 465 int kernctl_start_session(int fd)
 466 {
 467         return compat_ioctl_no_arg(fd, LTTNG_KERNEL_ABI_OLD_SESSION_START,
 468                         LTTNG_KERNEL_ABI_SESSION_START);
 469 }
 470
 471 int kernctl_stop_session(int fd)
 472 {
 473         return compat_ioctl_no_arg(fd, LTTNG_KERNEL_ABI_OLD_SESSION_STOP,
 474                         LTTNG_KERNEL_ABI_SESSION_STOP);
 475 }
 476
 477 int kernctl_create_event_notifier_group(int fd)
 478 {
 479         return LTTNG_IOCTL_NO_CHECK(fd,
 480                         LTTNG_KERNEL_ABI_EVENT_NOTIFIER_GROUP_CREATE);
 481 }
 482
 483 int kernctl_create_event_notifier_group_notification_fd(int group_fd)
 484 {
 485         return LTTNG_IOCTL_NO_CHECK(group_fd,
 486                         LTTNG_KERNEL_ABI_EVENT_NOTIFIER_GROUP_NOTIFICATION_FD);
 487 }
 488
 489 int kernctl_create_event_notifier_group_error_counter(int group_fd,
 490                 const struct lttng_kernel_abi_counter_conf *error_counter_conf)
 491 {
 492         return LTTNG_IOCTL_NO_CHECK(group_fd, LTTNG_KERNEL_ABI_COUNTER,
 493                         error_counter_conf);
 494 }
 495
 496 int kernctl_counter_get_aggregate_value(int counter_fd,
 497                 struct lttng_kernel_abi_counter_aggregate *value)
 498 {
 499         return LTTNG_IOCTL_NO_CHECK(counter_fd, LTTNG_KERNEL_ABI_COUNTER_AGGREGATE,
 500                         value);
 501 }
 502
 503 int kernctl_counter_clear(int counter_fd,
 504                 struct lttng_kernel_abi_counter_clear *clear)
 505 {
 506         return LTTNG_IOCTL_NO_CHECK(counter_fd, LTTNG_KERNEL_ABI_COUNTER_CLEAR,
 507                         clear);
 508 }
 509
 510 int kernctl_create_event_notifier(int group_fd,
 511                 const struct lttng_kernel_abi_event_notifier *event_notifier)
 512 {
 513         return LTTNG_IOCTL_NO_CHECK(group_fd,
 514                         LTTNG_KERNEL_ABI_EVENT_NOTIFIER_CREATE, event_notifier);
 515 }
 516
 517 int kernctl_capture(int fd, const struct lttng_bytecode *capture)
 518 {
 519         int ret;
 520         struct lttng_kernel_abi_capture_bytecode *kb;
 521
 522         /* Translate bytecode to kernel bytecode. */
 523         kb = zmalloc(sizeof(*kb) + capture->len);
 524         if (!kb) {
 525                 ret = -ENOMEM;
 526                 goto end;
 527         }
 528
 529         kb->len = capture->len;
 530         kb->reloc_offset = capture->reloc_table_offset;
 531         kb->seqnum = capture->seqnum;
 532         memcpy(kb->data, capture->data, capture->len);
 533         ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_CAPTURE, kb);
 534         free(kb);
 535 end:
 536         return ret;
 537 }
 538
 539 int kernctl_filter(int fd, const struct lttng_bytecode *filter)
 540 {
 541         struct lttng_kernel_abi_filter_bytecode *kb;
 542         uint32_t len;
 543         int ret;
 544
 545         /* Translate bytecode to kernel bytecode */
 546         kb = zmalloc(sizeof(*kb) + filter->len);
 547         if (!kb)
 548                 return -ENOMEM;
 549         kb->len = len = filter->len;
 550         kb->reloc_offset = filter->reloc_table_offset;
 551         kb->seqnum = filter->seqnum;
 552         memcpy(kb->data, filter->data, len);
 553         ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_FILTER, kb);
 554         free(kb);
 555         return ret;
 556 }
 557
 558 int kernctl_add_callsite(int fd, struct lttng_kernel_abi_event_callsite *callsite)
 559 {
 560         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_ADD_CALLSITE, callsite);
 561 }
 562
 563 int kernctl_tracepoint_list(int fd)
 564 {
 565         return compat_ioctl_no_arg(fd, LTTNG_KERNEL_ABI_OLD_TRACEPOINT_LIST,
 566                         LTTNG_KERNEL_ABI_TRACEPOINT_LIST);
 567 }
 568
 569 int kernctl_syscall_list(int fd)
 570 {
 571         return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_ABI_SYSCALL_LIST);
 572 }
 573
 574 int kernctl_tracer_version(int fd, struct lttng_kernel_abi_tracer_version *v)
 575 {
 576         int ret;
 577
 578         if (lttng_kernel_abi_use_old_abi == -1) {
 579                 ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_TRACER_VERSION, v);
 580                 if (!ret) {
 581                         lttng_kernel_abi_use_old_abi = 0;
 582                         goto end;
 583                 }
 584                 lttng_kernel_abi_use_old_abi = 1;
 585         }
 586         if (lttng_kernel_abi_use_old_abi) {
 587                 struct lttng_kernel_abi_old_tracer_version old_v;
 588
 589                 ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_OLD_TRACER_VERSION, &old_v);
 590                 if (ret) {
 591                         goto end;
 592                 }
 593                 v->major = old_v.major;
 594                 v->minor = old_v.minor;
 595                 v->patchlevel = old_v.patchlevel;
 596         } else {
 597                 ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_TRACER_VERSION, v);
 598         }
 599
 600 end:
 601         return ret;
 602 }
 603
 604 int kernctl_tracer_abi_version(int fd,
 605                 struct lttng_kernel_abi_tracer_abi_version *v)
 606 {
 607         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_TRACER_ABI_VERSION, v);
 608 }
 609
 610 int kernctl_wait_quiescent(int fd)
 611 {
 612         return compat_ioctl_no_arg(fd, LTTNG_KERNEL_ABI_OLD_WAIT_QUIESCENT,
 613                         LTTNG_KERNEL_ABI_WAIT_QUIESCENT);
 614 }
 615
 616 int kernctl_buffer_flush(int fd)
 617 {
 618         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH);
 619 }
 620
 621 int kernctl_buffer_flush_empty(int fd)
 622 {
 623         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_RING_BUFFER_FLUSH_EMPTY);
 624 }
 625
 626 int kernctl_buffer_clear(int fd)
 627 {
 628         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_RING_BUFFER_CLEAR);
 629 }
 630
 631 int kernctl_get_next_subbuf_metadata_check(int fd, bool *consistent)
 632 {
 633         return LTTNG_IOCTL_NO_CHECK(fd,
 634                         LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK,
 635                         consistent);
 636 }
 637
 638 /* returns the version of the metadata. */
 639 int kernctl_get_metadata_version(int fd, uint64_t *version)
 640 {
 641         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_RING_BUFFER_GET_METADATA_VERSION,
 642                         version);
 643 }
 644
 645 int kernctl_metadata_cache_dump(int fd)
 646 {
 647         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_RING_BUFFER_METADATA_CACHE_DUMP);
 648 }
 649
 650 /* Buffer operations */
 651
 652 /* For mmap mode, readable without "get" operation */
 653
 654 /* returns the length to mmap. */
 655 int kernctl_get_mmap_len(int fd, unsigned long *len)
 656 {
 657         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_RING_BUFFER_GET_MMAP_LEN,
 658                         len);
 659 }
 660
 661 /* returns the maximum size for sub-buffers. */
 662 int kernctl_get_max_subbuf_size(int fd, unsigned long *len)
 663 {
 664         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_RING_BUFFER_GET_MAX_SUBBUF_SIZE,
 665                         len);
 666 }
 667
 668 /*
 669  * For mmap mode, operate on the current packet (between get/put or
 670  * get_next/put_next).
 671  */
 672
 673 /* returns the offset of the subbuffer belonging to the mmap reader. */
 674 int kernctl_get_mmap_read_offset(int fd, unsigned long *off)
 675 {
 676         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_RING_BUFFER_GET_MMAP_READ_OFFSET,
 677                         off);
 678 }
 679
 680 /* returns the size of the current sub-buffer, without padding (for mmap). */
 681 int kernctl_get_subbuf_size(int fd, unsigned long *len)
 682 {
 683         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_RING_BUFFER_GET_SUBBUF_SIZE,
 684                         len);
 685 }
 686
 687 /* returns the size of the current sub-buffer, without padding (for mmap). */
 688 int kernctl_get_padded_subbuf_size(int fd, unsigned long *len)
 689 {
 690         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_RING_BUFFER_GET_PADDED_SUBBUF_SIZE,
 691                         len);
 692 }
 693
 694 /* Get exclusive read access to the next sub-buffer that can be read. */
 695 int kernctl_get_next_subbuf(int fd)
 696 {
 697         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_RING_BUFFER_GET_NEXT_SUBBUF);
 698 }
 699
 700
 701 /* Release exclusive sub-buffer access, move consumer forward. */
 702 int kernctl_put_next_subbuf(int fd)
 703 {
 704         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_RING_BUFFER_PUT_NEXT_SUBBUF);
 705 }
 706
 707 /* snapshot */
 708
 709 /* Get a snapshot of the current ring buffer producer and consumer positions */
 710 int kernctl_snapshot(int fd)
 711 {
 712         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_RING_BUFFER_SNAPSHOT);
 713 }
 714
 715 /*
 716  * Get a snapshot of the current ring buffer producer and consumer positions,
 717  * regardless of whether or not the two positions are contained within the
 718  * same sub-buffer.
 719  */
 720 int kernctl_snapshot_sample_positions(int fd)
 721 {
 722         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS);
 723 }
 724
 725 /* Get the consumer position (iteration start) */
 726 int kernctl_snapshot_get_consumed(int fd, unsigned long *pos)
 727 {
 728         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_RING_BUFFER_SNAPSHOT_GET_CONSUMED,
 729                         pos);
 730 }
 731
 732 /* Get the producer position (iteration end) */
 733 int kernctl_snapshot_get_produced(int fd, unsigned long *pos)
 734 {
 735         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_RING_BUFFER_SNAPSHOT_GET_PRODUCED,
 736                         pos);
 737 }
 738
 739 /* Get exclusive read access to the specified sub-buffer position */
 740 int kernctl_get_subbuf(int fd, unsigned long *len)
 741 {
 742         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_RING_BUFFER_GET_SUBBUF,
 743                         len);
 744 }
 745
 746 /* Release exclusive sub-buffer access */
 747 int kernctl_put_subbuf(int fd)
 748 {
 749         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_RING_BUFFER_PUT_SUBBUF);
 750 }
 751
 752 /* Returns the timestamp begin of the current sub-buffer. */
 753 int kernctl_get_timestamp_begin(int fd, uint64_t *timestamp_begin)
 754 {
 755         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_RING_BUFFER_GET_TIMESTAMP_BEGIN,
 756                         timestamp_begin);
 757 }
 758
 759 /* Returns the timestamp end of the current sub-buffer. */
 760 int kernctl_get_timestamp_end(int fd, uint64_t *timestamp_end)
 761 {
 762         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_RING_BUFFER_GET_TIMESTAMP_END,
 763                         timestamp_end);
 764 }
 765
 766 /* Returns the number of discarded events in the current sub-buffer. */
 767 int kernctl_get_events_discarded(int fd, uint64_t *events_discarded)
 768 {
 769         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_RING_BUFFER_GET_EVENTS_DISCARDED,
 770                         events_discarded);
 771 }
 772
 773 /* Returns the content size in the current sub-buffer. */
 774 int kernctl_get_content_size(int fd, uint64_t *content_size)
 775 {
 776         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_RING_BUFFER_GET_CONTENT_SIZE,
 777                         content_size);
 778 }
 779
 780 /* Returns the packet size in the current sub-buffer. */
 781 int kernctl_get_packet_size(int fd, uint64_t *packet_size)
 782 {
 783         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_RING_BUFFER_GET_PACKET_SIZE,
 784                         packet_size);
 785 }
 786
 787 /* Returns the stream id of the current sub-buffer. */
 788 int kernctl_get_stream_id(int fd, uint64_t *stream_id)
 789 {
 790         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_RING_BUFFER_GET_STREAM_ID,
 791                         stream_id);
 792 }
 793
 794 /* Returns the current timestamp. */
 795 int kernctl_get_current_timestamp(int fd, uint64_t *ts)
 796 {
 797         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_RING_BUFFER_GET_CURRENT_TIMESTAMP,
 798                         ts);
 799 }
 800
 801 /* Returns the packet sequence number of the current sub-buffer. */
 802 int kernctl_get_sequence_number(int fd, uint64_t *seq)
 803 {
 804         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_RING_BUFFER_GET_SEQ_NUM,
 805                         seq);
 806 }
 807
 808 /* Returns the stream instance id. */
 809 int kernctl_get_instance_id(int fd, uint64_t *id)
 810 {
 811         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ABI_RING_BUFFER_INSTANCE_ID,
 812                         id);
 813 }