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         int ret = ioctl(fildes, request, ##__VA_ARGS__);\
  27         assert(ret <= 0);                               \
  28         !ret ? 0 : -errno;                              \
  29 })
  30
  31 #define LTTNG_IOCTL_NO_CHECK(fildes, request, ...) ({   \
  32         int ret = ioctl(fildes, request, ##__VA_ARGS__);\
  33         ret >= 0 ? ret : -errno;                        \
  34 })
  35
  36 /*
  37  * This flag indicates which version of the kernel ABI to use. The old
  38  * ABI (namespace _old) does not support a 32-bit user-space when the
  39  * kernel is 64-bit. The old ABI is kept here for compatibility but is
  40  * deprecated and will be removed eventually.
  41  */
  42 static int lttng_kernel_use_old_abi = -1;
  43
  44 /*
  45  * Execute the new or old ioctl depending on the ABI version.
  46  * If the ABI version is not determined yet (lttng_kernel_use_old_abi = -1),
  47  * this function tests if the new ABI is available and otherwise fallbacks
  48  * on the old one.
  49  * This function takes the fd on which the ioctl must be executed and the old
  50  * and new request codes.
  51  * It returns the return value of the ioctl executed.
  52  */
  53 static inline int compat_ioctl_no_arg(int fd, unsigned long oldname,
  54                 unsigned long newname)
  55 {
  56         int ret;
  57
  58         if (lttng_kernel_use_old_abi == -1) {
  59                 ret = LTTNG_IOCTL_NO_CHECK(fd, newname);
  60                 if (!ret) {
  61                         lttng_kernel_use_old_abi = 0;
  62                         goto end;
  63                 }
  64                 lttng_kernel_use_old_abi = 1;
  65         }
  66         if (lttng_kernel_use_old_abi) {
  67                 ret = LTTNG_IOCTL_NO_CHECK(fd, oldname);
  68         } else {
  69                 ret = LTTNG_IOCTL_NO_CHECK(fd, newname);
  70         }
  71
  72 end:
  73         return ret;
  74 }
  75
  76 int kernctl_create_session(int fd)
  77 {
  78         return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION,
  79                         LTTNG_KERNEL_SESSION);
  80 }
  81
  82 /* open the metadata global channel */
  83 int kernctl_open_metadata(int fd, struct lttng_channel_attr *chops)
  84 {
  85         struct lttng_kernel_channel channel;
  86
  87         if (lttng_kernel_use_old_abi) {
  88                 struct lttng_kernel_old_channel old_channel;
  89
  90                 memset(&old_channel, 0, sizeof(old_channel));
  91                 old_channel.overwrite = chops->overwrite;
  92                 old_channel.subbuf_size = chops->subbuf_size;
  93                 old_channel.num_subbuf = chops->num_subbuf;
  94                 old_channel.switch_timer_interval = chops->switch_timer_interval;
  95                 old_channel.read_timer_interval = chops->read_timer_interval;
  96                 old_channel.output = chops->output;
  97
  98                 memset(old_channel.padding, 0, sizeof(old_channel.padding));
  99                 /*
 100                  * The new channel padding is smaller than the old ABI so we use the
 101                  * new ABI padding size for the memcpy.
 102                  */
 103                 memcpy(old_channel.padding, chops->padding, sizeof(chops->padding));
 104
 105                 return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_OLD_METADATA,
 106                                 &old_channel);
 107         }
 108
 109         memset(&channel, 0, sizeof(channel));
 110         channel.overwrite = chops->overwrite;
 111         channel.subbuf_size = chops->subbuf_size;
 112         channel.num_subbuf = chops->num_subbuf;
 113         channel.switch_timer_interval = chops->switch_timer_interval;
 114         channel.read_timer_interval = chops->read_timer_interval;
 115         channel.output = chops->output;
 116         memcpy(channel.padding, chops->padding, sizeof(chops->padding));
 117
 118         return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_METADATA, &channel);
 119 }
 120
 121 int kernctl_create_channel(int fd, struct lttng_channel_attr *chops)
 122 {
 123         struct lttng_kernel_channel channel;
 124
 125         memset(&channel, 0, sizeof(channel));
 126         if (lttng_kernel_use_old_abi) {
 127                 struct lttng_kernel_old_channel old_channel;
 128
 129                 old_channel.overwrite = chops->overwrite;
 130                 old_channel.subbuf_size = chops->subbuf_size;
 131                 old_channel.num_subbuf = chops->num_subbuf;
 132                 old_channel.switch_timer_interval = chops->switch_timer_interval;
 133                 old_channel.read_timer_interval = chops->read_timer_interval;
 134                 old_channel.output = chops->output;
 135
 136                 memset(old_channel.padding, 0, sizeof(old_channel.padding));
 137                 /*
 138                  * The new channel padding is smaller than the old ABI so we use the
 139                  * new ABI padding size for the memcpy.
 140                  */
 141                 memcpy(old_channel.padding, chops->padding, sizeof(chops->padding));
 142
 143                 return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_OLD_CHANNEL,
 144                                 &old_channel);
 145         }
 146
 147         channel.overwrite = chops->overwrite;
 148         channel.subbuf_size = chops->subbuf_size;
 149         channel.num_subbuf = chops->num_subbuf;
 150         channel.switch_timer_interval = chops->switch_timer_interval;
 151         channel.read_timer_interval = chops->read_timer_interval;
 152         channel.output = chops->output;
 153         memcpy(channel.padding, chops->padding, sizeof(chops->padding));
 154
 155         return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_CHANNEL, &channel);
 156 }
 157
 158 int kernctl_create_session_counter(int session_fd, struct lttng_kernel_counter_conf *counter_conf)
 159 {
 160         return LTTNG_IOCTL_NO_CHECK(session_fd, LTTNG_KERNEL_COUNTER, counter_conf);
 161 }
 162
 163
 164 int kernctl_syscall_mask(int fd, char **syscall_mask, uint32_t *nr_bits)
 165 {
 166         struct lttng_kernel_syscall_mask kmask_len, *kmask = NULL;
 167         size_t array_alloc_len;
 168         char *new_mask;
 169         int ret = 0;
 170
 171         if (!syscall_mask) {
 172                 ret = -1;
 173                 goto end;
 174         }
 175
 176         if (!nr_bits) {
 177                 ret = -1;
 178                 goto end;
 179         }
 180
 181         kmask_len.len = 0;
 182         ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SYSCALL_MASK, &kmask_len);
 183         if (ret) {
 184                 goto end;
 185         }
 186
 187         array_alloc_len = ALIGN(kmask_len.len, 8) >> 3;
 188
 189         kmask = zmalloc(sizeof(*kmask) + array_alloc_len);
 190         if (!kmask) {
 191                 ret = -1;
 192                 goto end;
 193         }
 194
 195         kmask->len = kmask_len.len;
 196         ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SYSCALL_MASK, kmask);
 197         if (ret) {
 198                 goto end;
 199         }
 200
 201         new_mask = realloc(*syscall_mask, array_alloc_len);
 202         if (!new_mask) {
 203                 ret = -1;
 204                 goto end;
 205         }
 206         memcpy(new_mask, kmask->mask, array_alloc_len);
 207         *syscall_mask = new_mask;
 208         *nr_bits = kmask->len;
 209
 210 end:
 211         free(kmask);
 212         return ret;
 213 }
 214
 215 int kernctl_track_pid(int fd, int pid)
 216 {
 217         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_TRACK_PID, pid);
 218 }
 219
 220 int kernctl_untrack_pid(int fd, int pid)
 221 {
 222         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_UNTRACK_PID, pid);
 223 }
 224
 225 int kernctl_list_tracker_pids(int fd)
 226 {
 227         return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS);
 228 }
 229
 230 static enum lttng_kernel_tracker_type get_kernel_tracker_type(
 231                 enum lttng_process_attr process_attr)
 232 {
 233         switch (process_attr) {
 234         case LTTNG_PROCESS_ATTR_PROCESS_ID:
 235                 return LTTNG_KERNEL_TRACKER_PID;
 236         case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID:
 237                 return LTTNG_KERNEL_TRACKER_VPID;
 238         case LTTNG_PROCESS_ATTR_USER_ID:
 239                 return LTTNG_KERNEL_TRACKER_UID;
 240         case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID:
 241                 return LTTNG_KERNEL_TRACKER_VUID;
 242         case LTTNG_PROCESS_ATTR_GROUP_ID:
 243                 return LTTNG_KERNEL_TRACKER_GID;
 244         case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID:
 245                 return LTTNG_KERNEL_TRACKER_VGID;
 246         default:
 247                 return LTTNG_KERNEL_TRACKER_UNKNOWN;
 248         }
 249 }
 250
 251 int kernctl_track_id(int fd, enum lttng_process_attr process_attr, int id)
 252 {
 253         struct lttng_kernel_tracker_args args;
 254
 255         args.id = id;
 256         args.type = get_kernel_tracker_type(process_attr);
 257         if (args.type == LTTNG_KERNEL_TRACKER_UNKNOWN) {
 258                 errno = EINVAL;
 259                 return -1;
 260         }
 261         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_TRACK_ID, &args);
 262 }
 263
 264 int kernctl_untrack_id(int fd, enum lttng_process_attr process_attr, int id)
 265 {
 266         struct lttng_kernel_tracker_args args;
 267
 268         args.id = id;
 269         args.type = get_kernel_tracker_type(process_attr);
 270         if (args.type == LTTNG_KERNEL_TRACKER_UNKNOWN) {
 271                 errno = EINVAL;
 272                 return -1;
 273         }
 274         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_UNTRACK_ID, &args);
 275 }
 276
 277 int kernctl_list_tracker_ids(int fd, enum lttng_process_attr process_attr)
 278 {
 279         struct lttng_kernel_tracker_args args;
 280
 281         args.id = -1;
 282         args.type = get_kernel_tracker_type(process_attr);
 283         if (args.type == LTTNG_KERNEL_TRACKER_UNKNOWN) {
 284                 errno = EINVAL;
 285                 return -1;
 286         }
 287         return LTTNG_IOCTL_NO_CHECK(
 288                         fd, LTTNG_KERNEL_SESSION_LIST_TRACKER_IDS, &args);
 289 }
 290
 291 int kernctl_session_regenerate_metadata(int fd)
 292 {
 293         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_METADATA_REGEN);
 294 }
 295
 296 int kernctl_session_regenerate_statedump(int fd)
 297 {
 298         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_STATEDUMP);
 299 }
 300
 301 int kernctl_session_set_name(int fd, const char *name)
 302 {
 303         int ret;
 304         struct lttng_kernel_session_name session_name;
 305
 306         ret = lttng_strncpy(session_name.name, name, sizeof(session_name.name));
 307         if (ret) {
 308                 goto end;
 309         }
 310
 311         ret = LTTNG_IOCTL_CHECK(
 312                         fd, LTTNG_KERNEL_SESSION_SET_NAME, &session_name);
 313 end:
 314         return ret;
 315 }
 316
 317 int kernctl_session_set_creation_time(int fd, time_t time)
 318 {
 319         int ret;
 320         struct lttng_kernel_session_creation_time creation_time;
 321
 322         ret = time_to_iso8601_str(time, creation_time.iso8601,
 323                         sizeof(creation_time.iso8601));
 324         if (ret) {
 325                 goto end;
 326         }
 327
 328         ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_SET_CREATION_TIME,
 329                         &creation_time);
 330 end:
 331         return ret;
 332 }
 333
 334 int kernctl_create_stream(int fd)
 335 {
 336         return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_STREAM,
 337                         LTTNG_KERNEL_STREAM);
 338 }
 339
 340 int kernctl_create_event(int fd, struct lttng_kernel_event *ev)
 341 {
 342         if (lttng_kernel_use_old_abi) {
 343                 struct lttng_kernel_old_event old_event;
 344
 345                 memset(&old_event, 0, sizeof(old_event));
 346                 memcpy(old_event.name, ev->name, sizeof(old_event.name));
 347                 old_event.instrumentation = ev->instrumentation;
 348                 switch (ev->instrumentation) {
 349                 case LTTNG_KERNEL_KPROBE:
 350                         old_event.u.kprobe.addr = ev->u.kprobe.addr;
 351                         old_event.u.kprobe.offset = ev->u.kprobe.offset;
 352                         memcpy(old_event.u.kprobe.symbol_name,
 353                                 ev->u.kprobe.symbol_name,
 354                                 sizeof(old_event.u.kprobe.symbol_name));
 355                         break;
 356                 case LTTNG_KERNEL_KRETPROBE:
 357                         old_event.u.kretprobe.addr = ev->u.kretprobe.addr;
 358                         old_event.u.kretprobe.offset = ev->u.kretprobe.offset;
 359                         memcpy(old_event.u.kretprobe.symbol_name,
 360                                 ev->u.kretprobe.symbol_name,
 361                                 sizeof(old_event.u.kretprobe.symbol_name));
 362                         break;
 363                 case LTTNG_KERNEL_FUNCTION:
 364                         memcpy(old_event.u.ftrace.symbol_name,
 365                                         ev->u.ftrace.symbol_name,
 366                                         sizeof(old_event.u.ftrace.symbol_name));
 367                         break;
 368                 default:
 369                         break;
 370                 }
 371
 372                 return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_OLD_EVENT,
 373                                 &old_event);
 374         }
 375         return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_EVENT, ev);
 376 }
 377
 378 int kernctl_add_context(int fd, struct lttng_kernel_context *ctx)
 379 {
 380         if (lttng_kernel_use_old_abi) {
 381                 struct lttng_kernel_old_context old_ctx;
 382
 383                 memset(&old_ctx, 0, sizeof(old_ctx));
 384                 old_ctx.ctx = ctx->ctx;
 385                 /* only type that uses the union */
 386                 if (ctx->ctx == LTTNG_KERNEL_CONTEXT_PERF_CPU_COUNTER) {
 387                         old_ctx.u.perf_counter.type =
 388                                 ctx->u.perf_counter.type;
 389                         old_ctx.u.perf_counter.config =
 390                                 ctx->u.perf_counter.config;
 391                         memcpy(old_ctx.u.perf_counter.name,
 392                                 ctx->u.perf_counter.name,
 393                                 sizeof(old_ctx.u.perf_counter.name));
 394                 }
 395                 return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_OLD_CONTEXT, &old_ctx);
 396         }
 397         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_CONTEXT, ctx);
 398 }
 399
 400
 401 /* Enable event, channel and session LTTNG_IOCTL_CHECK */
 402 int kernctl_enable(int fd)
 403 {
 404         return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_ENABLE,
 405                         LTTNG_KERNEL_ENABLE);
 406 }
 407
 408 /* Disable event, channel and session LTTNG_IOCTL_CHECK */
 409 int kernctl_disable(int fd)
 410 {
 411         return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_DISABLE,
 412                         LTTNG_KERNEL_DISABLE);
 413 }
 414
 415 int kernctl_start_session(int fd)
 416 {
 417         return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION_START,
 418                         LTTNG_KERNEL_SESSION_START);
 419 }
 420
 421 int kernctl_stop_session(int fd)
 422 {
 423         return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION_STOP,
 424                         LTTNG_KERNEL_SESSION_STOP);
 425 }
 426
 427 int kernctl_create_event_notifier_group(int fd)
 428 {
 429         return LTTNG_IOCTL_NO_CHECK(fd,
 430                         LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_CREATE);
 431 }
 432
 433 int kernctl_create_counter_event(int fd, struct lttng_kernel_counter_event *ev)
 434 {
 435         return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_COUNTER_EVENT, ev);
 436 }
 437
 438 int kernctl_create_event_notifier_group_notification_fd(int group_fd)
 439 {
 440         return LTTNG_IOCTL_NO_CHECK(group_fd,
 441                         LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_NOTIFICATION_FD);
 442 }
 443
 444 int kernctl_create_event_notifier_group_error_counter(int group_fd,
 445                 struct lttng_kernel_counter_conf *error_counter_conf)
 446 {
 447         return LTTNG_IOCTL_NO_CHECK(group_fd, LTTNG_KERNEL_COUNTER,
 448                         error_counter_conf);
 449 }
 450
 451 int kernctl_counter_read_value(int counter_fd,
 452                 struct lttng_kernel_counter_read *value)
 453 {
 454         return LTTNG_IOCTL_NO_CHECK(counter_fd, LTTNG_KERNEL_COUNTER_READ,
 455                         value);
 456 }
 457
 458 int kernctl_counter_get_aggregate_value(int counter_fd,
 459                 struct lttng_kernel_counter_aggregate *value)
 460 {
 461         return LTTNG_IOCTL_NO_CHECK(counter_fd, LTTNG_KERNEL_COUNTER_AGGREGATE,
 462                         value);
 463 }
 464
 465 int kernctl_counter_clear(int counter_fd,
 466                 struct lttng_kernel_counter_clear *clear)
 467 {
 468         return LTTNG_IOCTL_NO_CHECK(counter_fd, LTTNG_KERNEL_COUNTER_CLEAR,
 469                         clear);
 470 }
 471
 472 int kernctl_counter_map_descriptor_count(int counter_fd, uint64_t *count)
 473 {
 474         struct lttng_kernel_counter_map_nr_descriptors nr_desc;
 475         int ret;
 476
 477         ret = LTTNG_IOCTL_NO_CHECK(counter_fd,
 478                         LTTNG_KERNEL_COUNTER_MAP_NR_DESCRIPTORS, &nr_desc);
 479         *count = nr_desc.nr_descriptors;
 480
 481         return ret;
 482 }
 483
 484 int kernctl_counter_map_descriptor(int counter_fd,
 485                 struct lttng_kernel_counter_map_descriptor *descriptor)
 486 {
 487         return LTTNG_IOCTL_NO_CHECK(counter_fd,
 488                         LTTNG_KERNEL_COUNTER_MAP_DESCRIPTOR, descriptor);
 489 }
 490
 491 int kernctl_create_event_notifier(int group_fd,
 492                 const struct lttng_kernel_event_notifier *event_notifier)
 493 {
 494         return LTTNG_IOCTL_NO_CHECK(group_fd,
 495                         LTTNG_KERNEL_EVENT_NOTIFIER_CREATE, event_notifier);
 496 }
 497
 498 int kernctl_capture(int fd, const struct lttng_bytecode *capture)
 499 {
 500         struct lttng_kernel_capture_bytecode *kb;
 501         uint32_t len;
 502         int ret;
 503
 504         /* Translate bytecode to kernel bytecode */
 505         kb = zmalloc(sizeof(*kb) + capture->len);
 506         if (!kb)
 507                 return -ENOMEM;
 508         kb->len = len = capture->len;
 509         kb->reloc_offset = capture->reloc_table_offset;
 510         kb->seqnum = capture->seqnum;
 511         memcpy(kb->data, capture->data, len);
 512         ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_CAPTURE, kb);
 513         free(kb);
 514         return ret;
 515 }
 516
 517 int kernctl_filter(int fd, const struct lttng_bytecode *filter)
 518 {
 519         struct lttng_kernel_filter_bytecode *kb;
 520         uint32_t len;
 521         int ret;
 522
 523         /* Translate bytecode to kernel bytecode */
 524         kb = zmalloc(sizeof(*kb) + filter->len);
 525         if (!kb)
 526                 return -ENOMEM;
 527         kb->len = len = filter->len;
 528         kb->reloc_offset = filter->reloc_table_offset;
 529         kb->seqnum = filter->seqnum;
 530         memcpy(kb->data, filter->data, len);
 531         ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_FILTER, kb);
 532         free(kb);
 533         return ret;
 534 }
 535
 536 int kernctl_add_callsite(int fd, struct lttng_kernel_event_callsite *callsite)
 537 {
 538         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ADD_CALLSITE, callsite);
 539 }
 540
 541 int kernctl_tracepoint_list(int fd)
 542 {
 543         return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_TRACEPOINT_LIST,
 544                         LTTNG_KERNEL_TRACEPOINT_LIST);
 545 }
 546
 547 int kernctl_syscall_list(int fd)
 548 {
 549         return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_SYSCALL_LIST);
 550 }
 551
 552 int kernctl_tracer_version(int fd, struct lttng_kernel_tracer_version *v)
 553 {
 554         int ret;
 555
 556         if (lttng_kernel_use_old_abi == -1) {
 557                 ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_TRACER_VERSION, v);
 558                 if (!ret) {
 559                         lttng_kernel_use_old_abi = 0;
 560                         goto end;
 561                 }
 562                 lttng_kernel_use_old_abi = 1;
 563         }
 564         if (lttng_kernel_use_old_abi) {
 565                 struct lttng_kernel_old_tracer_version old_v;
 566
 567                 ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_OLD_TRACER_VERSION, &old_v);
 568                 if (ret) {
 569                         goto end;
 570                 }
 571                 v->major = old_v.major;
 572                 v->minor = old_v.minor;
 573                 v->patchlevel = old_v.patchlevel;
 574         } else {
 575                 ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_TRACER_VERSION, v);
 576         }
 577
 578 end:
 579         return ret;
 580 }
 581
 582 int kernctl_tracer_abi_version(int fd,
 583                 struct lttng_kernel_tracer_abi_version *v)
 584 {
 585         return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_TRACER_ABI_VERSION, v);
 586 }
 587
 588 int kernctl_wait_quiescent(int fd)
 589 {
 590         return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_WAIT_QUIESCENT,
 591                         LTTNG_KERNEL_WAIT_QUIESCENT);
 592 }
 593
 594 int kernctl_buffer_flush(int fd)
 595 {
 596         return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_FLUSH);
 597 }
 598
 599 int kernctl_buffer_flush_empty(int fd)
 600 {
 601         return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_FLUSH_EMPTY);
 602 }
 603
 604 int kernctl_buffer_clear(int fd)
 605 {
 606         return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_CLEAR);
 607 }
 608
 609 int kernctl_get_next_subbuf_metadata_check(int fd, bool *consistent)
 610 {
 611         return LTTNG_IOCTL_NO_CHECK(fd,
 612                         RING_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK,
 613                         consistent);
 614 }
 615
 616 /* returns the version of the metadata. */
 617 int kernctl_get_metadata_version(int fd, uint64_t *version)
 618 {
 619         return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_METADATA_VERSION, version);
 620 }
 621
 622 int kernctl_metadata_cache_dump(int fd)
 623 {
 624         return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_METADATA_CACHE_DUMP);
 625 }
 626
 627 /* Buffer operations */
 628
 629 /* For mmap mode, readable without "get" operation */
 630
 631 /* returns the length to mmap. */
 632 int kernctl_get_mmap_len(int fd, unsigned long *len)
 633 {
 634         return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_MMAP_LEN, len);
 635 }
 636
 637 /* returns the maximum size for sub-buffers. */
 638 int kernctl_get_max_subbuf_size(int fd, unsigned long *len)
 639 {
 640         return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_MAX_SUBBUF_SIZE, len);
 641 }
 642
 643 /*
 644  * For mmap mode, operate on the current packet (between get/put or
 645  * get_next/put_next).
 646  */
 647
 648 /* returns the offset of the subbuffer belonging to the mmap reader. */
 649 int kernctl_get_mmap_read_offset(int fd, unsigned long *off)
 650 {
 651         return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_MMAP_READ_OFFSET, off);
 652 }
 653
 654 /* returns the size of the current sub-buffer, without padding (for mmap). */
 655 int kernctl_get_subbuf_size(int fd, unsigned long *len)
 656 {
 657         return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_SUBBUF_SIZE, len);
 658 }
 659
 660 /* returns the size of the current sub-buffer, without padding (for mmap). */
 661 int kernctl_get_padded_subbuf_size(int fd, unsigned long *len)
 662 {
 663         return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_PADDED_SUBBUF_SIZE, len);
 664 }
 665
 666 /* Get exclusive read access to the next sub-buffer that can be read. */
 667 int kernctl_get_next_subbuf(int fd)
 668 {
 669         return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_NEXT_SUBBUF);
 670 }
 671
 672
 673 /* Release exclusive sub-buffer access, move consumer forward. */
 674 int kernctl_put_next_subbuf(int fd)
 675 {
 676         return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_PUT_NEXT_SUBBUF);
 677 }
 678
 679 /* snapshot */
 680
 681 /* Get a snapshot of the current ring buffer producer and consumer positions */
 682 int kernctl_snapshot(int fd)
 683 {
 684         return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_SNAPSHOT);
 685 }
 686
 687 /*
 688  * Get a snapshot of the current ring buffer producer and consumer positions,
 689  * regardless of whether or not the two positions are contained within the
 690  * same sub-buffer.
 691  */
 692 int kernctl_snapshot_sample_positions(int fd)
 693 {
 694         return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS);
 695 }
 696
 697 /* Get the consumer position (iteration start) */
 698 int kernctl_snapshot_get_consumed(int fd, unsigned long *pos)
 699 {
 700         return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_SNAPSHOT_GET_CONSUMED, pos);
 701 }
 702
 703 /* Get the producer position (iteration end) */
 704 int kernctl_snapshot_get_produced(int fd, unsigned long *pos)
 705 {
 706         return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_SNAPSHOT_GET_PRODUCED, pos);
 707 }
 708
 709 /* Get exclusive read access to the specified sub-buffer position */
 710 int kernctl_get_subbuf(int fd, unsigned long *len)
 711 {
 712         return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_SUBBUF, len);
 713 }
 714
 715 /* Release exclusive sub-buffer access */
 716 int kernctl_put_subbuf(int fd)
 717 {
 718         return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_PUT_SUBBUF);
 719 }
 720
 721 /* Returns the timestamp begin of the current sub-buffer. */
 722 int kernctl_get_timestamp_begin(int fd, uint64_t *timestamp_begin)
 723 {
 724         return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN,
 725                         timestamp_begin);
 726 }
 727
 728 /* Returns the timestamp end of the current sub-buffer. */
 729 int kernctl_get_timestamp_end(int fd, uint64_t *timestamp_end)
 730 {
 731         return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_TIMESTAMP_END,
 732                         timestamp_end);
 733 }
 734
 735 /* Returns the number of discarded events in the current sub-buffer. */
 736 int kernctl_get_events_discarded(int fd, uint64_t *events_discarded)
 737 {
 738         return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED,
 739                         events_discarded);
 740 }
 741
 742 /* Returns the content size in the current sub-buffer. */
 743 int kernctl_get_content_size(int fd, uint64_t *content_size)
 744 {
 745         return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_CONTENT_SIZE,
 746                         content_size);
 747 }
 748
 749 /* Returns the packet size in the current sub-buffer. */
 750 int kernctl_get_packet_size(int fd, uint64_t *packet_size)
 751 {
 752         return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_PACKET_SIZE,
 753                         packet_size);
 754 }
 755
 756 /* Returns the stream id of the current sub-buffer. */
 757 int kernctl_get_stream_id(int fd, uint64_t *stream_id)
 758 {
 759         return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_STREAM_ID,
 760                         stream_id);
 761 }
 762
 763 /* Returns the current timestamp. */
 764 int kernctl_get_current_timestamp(int fd, uint64_t *ts)
 765 {
 766         return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP,
 767                         ts);
 768 }
 769
 770 /* Returns the packet sequence number of the current sub-buffer. */
 771 int kernctl_get_sequence_number(int fd, uint64_t *seq)
 772 {
 773         return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_SEQ_NUM, seq);
 774 }
 775
 776 /* Returns the stream instance id. */
 777 int kernctl_get_instance_id(int fd, uint64_t *id)
 778 {
 779         return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_INSTANCE_ID, id);
 780 }