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