| 1 | /* |
| 2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> |
| 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 4 | * 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License, version 2 only, |
| 8 | * as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License along |
| 16 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | */ |
| 19 | |
| 20 | #define _LGPL_SOURCE |
| 21 | #define __USE_LINUX_IOCTL_DEFS |
| 22 | #include <sys/ioctl.h> |
| 23 | #include <string.h> |
| 24 | #include <common/align.h> |
| 25 | #include <common/macros.h> |
| 26 | #include <errno.h> |
| 27 | #include <stdarg.h> |
| 28 | #include <assert.h> |
| 29 | #include <common/time.h> |
| 30 | |
| 31 | #include "kernel-ctl.h" |
| 32 | #include "kernel-ioctl.h" |
| 33 | |
| 34 | #define LTTNG_IOCTL_CHECK(fildes, request, ...) ({ \ |
| 35 | int ret = ioctl(fildes, request, ##__VA_ARGS__);\ |
| 36 | assert(ret <= 0); \ |
| 37 | !ret ? 0 : -errno; \ |
| 38 | }) |
| 39 | |
| 40 | #define LTTNG_IOCTL_NO_CHECK(fildes, request, ...) ({ \ |
| 41 | int ret = ioctl(fildes, request, ##__VA_ARGS__);\ |
| 42 | ret >= 0 ? ret : -errno; \ |
| 43 | }) |
| 44 | |
| 45 | /* |
| 46 | * This flag indicates which version of the kernel ABI to use. The old |
| 47 | * ABI (namespace _old) does not support a 32-bit user-space when the |
| 48 | * kernel is 64-bit. The old ABI is kept here for compatibility but is |
| 49 | * deprecated and will be removed eventually. |
| 50 | */ |
| 51 | static int lttng_kernel_use_old_abi = -1; |
| 52 | |
| 53 | /* |
| 54 | * Execute the new or old ioctl depending on the ABI version. |
| 55 | * If the ABI version is not determined yet (lttng_kernel_use_old_abi = -1), |
| 56 | * this function tests if the new ABI is available and otherwise fallbacks |
| 57 | * on the old one. |
| 58 | * This function takes the fd on which the ioctl must be executed and the old |
| 59 | * and new request codes. |
| 60 | * It returns the return value of the ioctl executed. |
| 61 | */ |
| 62 | static inline int compat_ioctl_no_arg(int fd, unsigned long oldname, |
| 63 | unsigned long newname) |
| 64 | { |
| 65 | int ret; |
| 66 | |
| 67 | if (lttng_kernel_use_old_abi == -1) { |
| 68 | ret = LTTNG_IOCTL_NO_CHECK(fd, newname); |
| 69 | if (!ret) { |
| 70 | lttng_kernel_use_old_abi = 0; |
| 71 | goto end; |
| 72 | } |
| 73 | lttng_kernel_use_old_abi = 1; |
| 74 | } |
| 75 | if (lttng_kernel_use_old_abi) { |
| 76 | ret = LTTNG_IOCTL_NO_CHECK(fd, oldname); |
| 77 | } else { |
| 78 | ret = LTTNG_IOCTL_NO_CHECK(fd, newname); |
| 79 | } |
| 80 | |
| 81 | end: |
| 82 | return ret; |
| 83 | } |
| 84 | |
| 85 | int kernctl_create_session(int fd) |
| 86 | { |
| 87 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION, |
| 88 | LTTNG_KERNEL_SESSION); |
| 89 | } |
| 90 | |
| 91 | /* open the metadata global channel */ |
| 92 | int kernctl_open_metadata(int fd, struct lttng_channel_attr *chops) |
| 93 | { |
| 94 | struct lttng_kernel_channel channel; |
| 95 | |
| 96 | if (lttng_kernel_use_old_abi) { |
| 97 | struct lttng_kernel_old_channel old_channel; |
| 98 | |
| 99 | memset(&old_channel, 0, sizeof(old_channel)); |
| 100 | old_channel.overwrite = chops->overwrite; |
| 101 | old_channel.subbuf_size = chops->subbuf_size; |
| 102 | old_channel.num_subbuf = chops->num_subbuf; |
| 103 | old_channel.switch_timer_interval = chops->switch_timer_interval; |
| 104 | old_channel.read_timer_interval = chops->read_timer_interval; |
| 105 | old_channel.output = chops->output; |
| 106 | |
| 107 | memset(old_channel.padding, 0, sizeof(old_channel.padding)); |
| 108 | /* |
| 109 | * The new channel padding is smaller than the old ABI so we use the |
| 110 | * new ABI padding size for the memcpy. |
| 111 | */ |
| 112 | memcpy(old_channel.padding, chops->padding, sizeof(chops->padding)); |
| 113 | |
| 114 | return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_OLD_METADATA, |
| 115 | &old_channel); |
| 116 | } |
| 117 | |
| 118 | memset(&channel, 0, sizeof(channel)); |
| 119 | channel.overwrite = chops->overwrite; |
| 120 | channel.subbuf_size = chops->subbuf_size; |
| 121 | channel.num_subbuf = chops->num_subbuf; |
| 122 | channel.switch_timer_interval = chops->switch_timer_interval; |
| 123 | channel.read_timer_interval = chops->read_timer_interval; |
| 124 | channel.output = chops->output; |
| 125 | memcpy(channel.padding, chops->padding, sizeof(chops->padding)); |
| 126 | |
| 127 | return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_METADATA, &channel); |
| 128 | } |
| 129 | |
| 130 | int kernctl_create_channel(int fd, struct lttng_channel_attr *chops) |
| 131 | { |
| 132 | struct lttng_kernel_channel channel; |
| 133 | |
| 134 | memset(&channel, 0, sizeof(channel)); |
| 135 | if (lttng_kernel_use_old_abi) { |
| 136 | struct lttng_kernel_old_channel old_channel; |
| 137 | |
| 138 | old_channel.overwrite = chops->overwrite; |
| 139 | old_channel.subbuf_size = chops->subbuf_size; |
| 140 | old_channel.num_subbuf = chops->num_subbuf; |
| 141 | old_channel.switch_timer_interval = chops->switch_timer_interval; |
| 142 | old_channel.read_timer_interval = chops->read_timer_interval; |
| 143 | old_channel.output = chops->output; |
| 144 | |
| 145 | memset(old_channel.padding, 0, sizeof(old_channel.padding)); |
| 146 | /* |
| 147 | * The new channel padding is smaller than the old ABI so we use the |
| 148 | * new ABI padding size for the memcpy. |
| 149 | */ |
| 150 | memcpy(old_channel.padding, chops->padding, sizeof(chops->padding)); |
| 151 | |
| 152 | return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_OLD_CHANNEL, |
| 153 | &old_channel); |
| 154 | } |
| 155 | |
| 156 | channel.overwrite = chops->overwrite; |
| 157 | channel.subbuf_size = chops->subbuf_size; |
| 158 | channel.num_subbuf = chops->num_subbuf; |
| 159 | channel.switch_timer_interval = chops->switch_timer_interval; |
| 160 | channel.read_timer_interval = chops->read_timer_interval; |
| 161 | channel.output = chops->output; |
| 162 | memcpy(channel.padding, chops->padding, sizeof(chops->padding)); |
| 163 | |
| 164 | return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_CHANNEL, &channel); |
| 165 | } |
| 166 | |
| 167 | int kernctl_syscall_mask(int fd, char **syscall_mask, uint32_t *nr_bits) |
| 168 | { |
| 169 | struct lttng_kernel_syscall_mask kmask_len, *kmask = NULL; |
| 170 | size_t array_alloc_len; |
| 171 | char *new_mask; |
| 172 | int ret = 0; |
| 173 | |
| 174 | if (!syscall_mask) { |
| 175 | ret = -1; |
| 176 | goto end; |
| 177 | } |
| 178 | |
| 179 | if (!nr_bits) { |
| 180 | ret = -1; |
| 181 | goto end; |
| 182 | } |
| 183 | |
| 184 | kmask_len.len = 0; |
| 185 | ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SYSCALL_MASK, &kmask_len); |
| 186 | if (ret) { |
| 187 | goto end; |
| 188 | } |
| 189 | |
| 190 | array_alloc_len = ALIGN(kmask_len.len, 8) >> 3; |
| 191 | |
| 192 | kmask = zmalloc(sizeof(*kmask) + array_alloc_len); |
| 193 | if (!kmask) { |
| 194 | ret = -1; |
| 195 | goto end; |
| 196 | } |
| 197 | |
| 198 | kmask->len = kmask_len.len; |
| 199 | ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SYSCALL_MASK, kmask); |
| 200 | if (ret) { |
| 201 | goto end; |
| 202 | } |
| 203 | |
| 204 | new_mask = realloc(*syscall_mask, array_alloc_len); |
| 205 | if (!new_mask) { |
| 206 | ret = -1; |
| 207 | goto end; |
| 208 | } |
| 209 | memcpy(new_mask, kmask->mask, array_alloc_len); |
| 210 | *syscall_mask = new_mask; |
| 211 | *nr_bits = kmask->len; |
| 212 | |
| 213 | end: |
| 214 | free(kmask); |
| 215 | return ret; |
| 216 | } |
| 217 | |
| 218 | int kernctl_track_pid(int fd, int pid) |
| 219 | { |
| 220 | return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_TRACK_PID, pid); |
| 221 | } |
| 222 | |
| 223 | int kernctl_untrack_pid(int fd, int pid) |
| 224 | { |
| 225 | return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_UNTRACK_PID, pid); |
| 226 | } |
| 227 | |
| 228 | int kernctl_list_tracker_pids(int fd) |
| 229 | { |
| 230 | return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS); |
| 231 | } |
| 232 | |
| 233 | int kernctl_session_regenerate_metadata(int fd) |
| 234 | { |
| 235 | return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_METADATA_REGEN); |
| 236 | } |
| 237 | |
| 238 | int kernctl_session_regenerate_statedump(int fd) |
| 239 | { |
| 240 | return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_STATEDUMP); |
| 241 | } |
| 242 | |
| 243 | int kernctl_session_set_name(int fd, const char *name) |
| 244 | { |
| 245 | int ret; |
| 246 | struct lttng_kernel_session_name session_name; |
| 247 | |
| 248 | ret = lttng_strncpy(session_name.name, name, sizeof(session_name.name)); |
| 249 | if (ret) { |
| 250 | goto end; |
| 251 | } |
| 252 | |
| 253 | ret = LTTNG_IOCTL_CHECK( |
| 254 | fd, LTTNG_KERNEL_SESSION_SET_NAME, &session_name); |
| 255 | end: |
| 256 | return ret; |
| 257 | } |
| 258 | |
| 259 | int kernctl_session_set_creation_time(int fd, time_t time) |
| 260 | { |
| 261 | int ret; |
| 262 | struct lttng_kernel_session_creation_time creation_time; |
| 263 | |
| 264 | ret = time_to_iso8601_str(time, creation_time.iso8601, |
| 265 | sizeof(creation_time.iso8601)); |
| 266 | if (ret) { |
| 267 | goto end; |
| 268 | } |
| 269 | |
| 270 | ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_SET_CREATION_TIME, |
| 271 | &creation_time); |
| 272 | end: |
| 273 | return ret; |
| 274 | } |
| 275 | |
| 276 | int kernctl_create_stream(int fd) |
| 277 | { |
| 278 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_STREAM, |
| 279 | LTTNG_KERNEL_STREAM); |
| 280 | } |
| 281 | |
| 282 | int kernctl_create_event(int fd, struct lttng_kernel_event *ev) |
| 283 | { |
| 284 | if (lttng_kernel_use_old_abi) { |
| 285 | struct lttng_kernel_old_event old_event; |
| 286 | |
| 287 | memset(&old_event, 0, sizeof(old_event)); |
| 288 | memcpy(old_event.name, ev->name, sizeof(old_event.name)); |
| 289 | old_event.instrumentation = ev->instrumentation; |
| 290 | switch (ev->instrumentation) { |
| 291 | case LTTNG_KERNEL_KPROBE: |
| 292 | old_event.u.kprobe.addr = ev->u.kprobe.addr; |
| 293 | old_event.u.kprobe.offset = ev->u.kprobe.offset; |
| 294 | memcpy(old_event.u.kprobe.symbol_name, |
| 295 | ev->u.kprobe.symbol_name, |
| 296 | sizeof(old_event.u.kprobe.symbol_name)); |
| 297 | break; |
| 298 | case LTTNG_KERNEL_KRETPROBE: |
| 299 | old_event.u.kretprobe.addr = ev->u.kretprobe.addr; |
| 300 | old_event.u.kretprobe.offset = ev->u.kretprobe.offset; |
| 301 | memcpy(old_event.u.kretprobe.symbol_name, |
| 302 | ev->u.kretprobe.symbol_name, |
| 303 | sizeof(old_event.u.kretprobe.symbol_name)); |
| 304 | break; |
| 305 | case LTTNG_KERNEL_FUNCTION: |
| 306 | memcpy(old_event.u.ftrace.symbol_name, |
| 307 | ev->u.ftrace.symbol_name, |
| 308 | sizeof(old_event.u.ftrace.symbol_name)); |
| 309 | break; |
| 310 | default: |
| 311 | break; |
| 312 | } |
| 313 | |
| 314 | return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_OLD_EVENT, |
| 315 | &old_event); |
| 316 | } |
| 317 | return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_EVENT, ev); |
| 318 | } |
| 319 | |
| 320 | int kernctl_add_context(int fd, struct lttng_kernel_context *ctx) |
| 321 | { |
| 322 | if (lttng_kernel_use_old_abi) { |
| 323 | struct lttng_kernel_old_context old_ctx; |
| 324 | |
| 325 | memset(&old_ctx, 0, sizeof(old_ctx)); |
| 326 | old_ctx.ctx = ctx->ctx; |
| 327 | /* only type that uses the union */ |
| 328 | if (ctx->ctx == LTTNG_KERNEL_CONTEXT_PERF_CPU_COUNTER) { |
| 329 | old_ctx.u.perf_counter.type = |
| 330 | ctx->u.perf_counter.type; |
| 331 | old_ctx.u.perf_counter.config = |
| 332 | ctx->u.perf_counter.config; |
| 333 | memcpy(old_ctx.u.perf_counter.name, |
| 334 | ctx->u.perf_counter.name, |
| 335 | sizeof(old_ctx.u.perf_counter.name)); |
| 336 | } |
| 337 | return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_OLD_CONTEXT, &old_ctx); |
| 338 | } |
| 339 | return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_CONTEXT, ctx); |
| 340 | } |
| 341 | |
| 342 | |
| 343 | /* Enable event, channel and session LTTNG_IOCTL_CHECK */ |
| 344 | int kernctl_enable(int fd) |
| 345 | { |
| 346 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_ENABLE, |
| 347 | LTTNG_KERNEL_ENABLE); |
| 348 | } |
| 349 | |
| 350 | /* Disable event, channel and session LTTNG_IOCTL_CHECK */ |
| 351 | int kernctl_disable(int fd) |
| 352 | { |
| 353 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_DISABLE, |
| 354 | LTTNG_KERNEL_DISABLE); |
| 355 | } |
| 356 | |
| 357 | int kernctl_start_session(int fd) |
| 358 | { |
| 359 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION_START, |
| 360 | LTTNG_KERNEL_SESSION_START); |
| 361 | } |
| 362 | |
| 363 | int kernctl_stop_session(int fd) |
| 364 | { |
| 365 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_SESSION_STOP, |
| 366 | LTTNG_KERNEL_SESSION_STOP); |
| 367 | } |
| 368 | |
| 369 | int kernctl_filter(int fd, struct lttng_filter_bytecode *filter) |
| 370 | { |
| 371 | struct lttng_kernel_filter_bytecode *kb; |
| 372 | uint32_t len; |
| 373 | int ret; |
| 374 | |
| 375 | /* Translate bytecode to kernel bytecode */ |
| 376 | kb = zmalloc(sizeof(*kb) + filter->len); |
| 377 | if (!kb) |
| 378 | return -ENOMEM; |
| 379 | kb->len = len = filter->len; |
| 380 | kb->reloc_offset = filter->reloc_table_offset; |
| 381 | kb->seqnum = filter->seqnum; |
| 382 | memcpy(kb->data, filter->data, len); |
| 383 | ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_FILTER, kb); |
| 384 | free(kb); |
| 385 | return ret; |
| 386 | } |
| 387 | |
| 388 | int kernctl_add_callsite(int fd, struct lttng_kernel_event_callsite *callsite) |
| 389 | { |
| 390 | return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_ADD_CALLSITE, callsite); |
| 391 | } |
| 392 | |
| 393 | int kernctl_tracepoint_list(int fd) |
| 394 | { |
| 395 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_TRACEPOINT_LIST, |
| 396 | LTTNG_KERNEL_TRACEPOINT_LIST); |
| 397 | } |
| 398 | |
| 399 | int kernctl_syscall_list(int fd) |
| 400 | { |
| 401 | return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_SYSCALL_LIST); |
| 402 | } |
| 403 | |
| 404 | int kernctl_tracer_version(int fd, struct lttng_kernel_tracer_version *v) |
| 405 | { |
| 406 | int ret; |
| 407 | |
| 408 | if (lttng_kernel_use_old_abi == -1) { |
| 409 | ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_TRACER_VERSION, v); |
| 410 | if (!ret) { |
| 411 | lttng_kernel_use_old_abi = 0; |
| 412 | goto end; |
| 413 | } |
| 414 | lttng_kernel_use_old_abi = 1; |
| 415 | } |
| 416 | if (lttng_kernel_use_old_abi) { |
| 417 | struct lttng_kernel_old_tracer_version old_v; |
| 418 | |
| 419 | ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_OLD_TRACER_VERSION, &old_v); |
| 420 | if (ret) { |
| 421 | goto end; |
| 422 | } |
| 423 | v->major = old_v.major; |
| 424 | v->minor = old_v.minor; |
| 425 | v->patchlevel = old_v.patchlevel; |
| 426 | } else { |
| 427 | ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_TRACER_VERSION, v); |
| 428 | } |
| 429 | |
| 430 | end: |
| 431 | return ret; |
| 432 | } |
| 433 | |
| 434 | int kernctl_tracer_abi_version(int fd, |
| 435 | struct lttng_kernel_tracer_abi_version *v) |
| 436 | { |
| 437 | return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_TRACER_ABI_VERSION, v); |
| 438 | } |
| 439 | |
| 440 | int kernctl_wait_quiescent(int fd) |
| 441 | { |
| 442 | return compat_ioctl_no_arg(fd, LTTNG_KERNEL_OLD_WAIT_QUIESCENT, |
| 443 | LTTNG_KERNEL_WAIT_QUIESCENT); |
| 444 | } |
| 445 | |
| 446 | int kernctl_buffer_flush(int fd) |
| 447 | { |
| 448 | return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_FLUSH); |
| 449 | } |
| 450 | |
| 451 | int kernctl_buffer_flush_empty(int fd) |
| 452 | { |
| 453 | return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_FLUSH_EMPTY); |
| 454 | } |
| 455 | |
| 456 | int kernctl_get_next_subbuf_metadata_check(int fd, bool *consistent) |
| 457 | { |
| 458 | return LTTNG_IOCTL_NO_CHECK(fd, |
| 459 | RING_RING_BUFFER_GET_NEXT_SUBBUF_METADATA_CHECK, |
| 460 | consistent); |
| 461 | } |
| 462 | |
| 463 | /* returns the version of the metadata. */ |
| 464 | int kernctl_get_metadata_version(int fd, uint64_t *version) |
| 465 | { |
| 466 | return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_METADATA_VERSION, version); |
| 467 | } |
| 468 | |
| 469 | int kernctl_metadata_cache_dump(int fd) |
| 470 | { |
| 471 | return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_METADATA_CACHE_DUMP); |
| 472 | } |
| 473 | |
| 474 | /* Buffer operations */ |
| 475 | |
| 476 | /* For mmap mode, readable without "get" operation */ |
| 477 | |
| 478 | /* returns the length to mmap. */ |
| 479 | int kernctl_get_mmap_len(int fd, unsigned long *len) |
| 480 | { |
| 481 | return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_MMAP_LEN, len); |
| 482 | } |
| 483 | |
| 484 | /* returns the maximum size for sub-buffers. */ |
| 485 | int kernctl_get_max_subbuf_size(int fd, unsigned long *len) |
| 486 | { |
| 487 | return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_MAX_SUBBUF_SIZE, len); |
| 488 | } |
| 489 | |
| 490 | /* |
| 491 | * For mmap mode, operate on the current packet (between get/put or |
| 492 | * get_next/put_next). |
| 493 | */ |
| 494 | |
| 495 | /* returns the offset of the subbuffer belonging to the mmap reader. */ |
| 496 | int kernctl_get_mmap_read_offset(int fd, unsigned long *off) |
| 497 | { |
| 498 | return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_MMAP_READ_OFFSET, off); |
| 499 | } |
| 500 | |
| 501 | /* returns the size of the current sub-buffer, without padding (for mmap). */ |
| 502 | int kernctl_get_subbuf_size(int fd, unsigned long *len) |
| 503 | { |
| 504 | return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_SUBBUF_SIZE, len); |
| 505 | } |
| 506 | |
| 507 | /* returns the size of the current sub-buffer, without padding (for mmap). */ |
| 508 | int kernctl_get_padded_subbuf_size(int fd, unsigned long *len) |
| 509 | { |
| 510 | return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_PADDED_SUBBUF_SIZE, len); |
| 511 | } |
| 512 | |
| 513 | /* Get exclusive read access to the next sub-buffer that can be read. */ |
| 514 | int kernctl_get_next_subbuf(int fd) |
| 515 | { |
| 516 | return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_NEXT_SUBBUF); |
| 517 | } |
| 518 | |
| 519 | |
| 520 | /* Release exclusive sub-buffer access, move consumer forward. */ |
| 521 | int kernctl_put_next_subbuf(int fd) |
| 522 | { |
| 523 | return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_PUT_NEXT_SUBBUF); |
| 524 | } |
| 525 | |
| 526 | /* snapshot */ |
| 527 | |
| 528 | /* Get a snapshot of the current ring buffer producer and consumer positions */ |
| 529 | int kernctl_snapshot(int fd) |
| 530 | { |
| 531 | return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_SNAPSHOT); |
| 532 | } |
| 533 | |
| 534 | /* |
| 535 | * Get a snapshot of the current ring buffer producer and consumer positions, |
| 536 | * regardless of whether or not the two positions are contained within the |
| 537 | * same sub-buffer. |
| 538 | */ |
| 539 | int kernctl_snapshot_sample_positions(int fd) |
| 540 | { |
| 541 | return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_SNAPSHOT_SAMPLE_POSITIONS); |
| 542 | } |
| 543 | |
| 544 | /* Get the consumer position (iteration start) */ |
| 545 | int kernctl_snapshot_get_consumed(int fd, unsigned long *pos) |
| 546 | { |
| 547 | return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_SNAPSHOT_GET_CONSUMED, pos); |
| 548 | } |
| 549 | |
| 550 | /* Get the producer position (iteration end) */ |
| 551 | int kernctl_snapshot_get_produced(int fd, unsigned long *pos) |
| 552 | { |
| 553 | return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_SNAPSHOT_GET_PRODUCED, pos); |
| 554 | } |
| 555 | |
| 556 | /* Get exclusive read access to the specified sub-buffer position */ |
| 557 | int kernctl_get_subbuf(int fd, unsigned long *len) |
| 558 | { |
| 559 | return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_GET_SUBBUF, len); |
| 560 | } |
| 561 | |
| 562 | /* Release exclusive sub-buffer access */ |
| 563 | int kernctl_put_subbuf(int fd) |
| 564 | { |
| 565 | return LTTNG_IOCTL_CHECK(fd, RING_BUFFER_PUT_SUBBUF); |
| 566 | } |
| 567 | |
| 568 | /* Returns the timestamp begin of the current sub-buffer. */ |
| 569 | int kernctl_get_timestamp_begin(int fd, uint64_t *timestamp_begin) |
| 570 | { |
| 571 | return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN, |
| 572 | timestamp_begin); |
| 573 | } |
| 574 | |
| 575 | /* Returns the timestamp end of the current sub-buffer. */ |
| 576 | int kernctl_get_timestamp_end(int fd, uint64_t *timestamp_end) |
| 577 | { |
| 578 | return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_TIMESTAMP_END, |
| 579 | timestamp_end); |
| 580 | } |
| 581 | |
| 582 | /* Returns the number of discarded events in the current sub-buffer. */ |
| 583 | int kernctl_get_events_discarded(int fd, uint64_t *events_discarded) |
| 584 | { |
| 585 | return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED, |
| 586 | events_discarded); |
| 587 | } |
| 588 | |
| 589 | /* Returns the content size in the current sub-buffer. */ |
| 590 | int kernctl_get_content_size(int fd, uint64_t *content_size) |
| 591 | { |
| 592 | return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_CONTENT_SIZE, |
| 593 | content_size); |
| 594 | } |
| 595 | |
| 596 | /* Returns the packet size in the current sub-buffer. */ |
| 597 | int kernctl_get_packet_size(int fd, uint64_t *packet_size) |
| 598 | { |
| 599 | return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_PACKET_SIZE, |
| 600 | packet_size); |
| 601 | } |
| 602 | |
| 603 | /* Returns the stream id of the current sub-buffer. */ |
| 604 | int kernctl_get_stream_id(int fd, uint64_t *stream_id) |
| 605 | { |
| 606 | return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_STREAM_ID, |
| 607 | stream_id); |
| 608 | } |
| 609 | |
| 610 | /* Returns the current timestamp. */ |
| 611 | int kernctl_get_current_timestamp(int fd, uint64_t *ts) |
| 612 | { |
| 613 | return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP, |
| 614 | ts); |
| 615 | } |
| 616 | |
| 617 | /* Returns the packet sequence number of the current sub-buffer. */ |
| 618 | int kernctl_get_sequence_number(int fd, uint64_t *seq) |
| 619 | { |
| 620 | return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_GET_SEQ_NUM, seq); |
| 621 | } |
| 622 | |
| 623 | /* Returns the stream instance id. */ |
| 624 | int kernctl_get_instance_id(int fd, uint64_t *id) |
| 625 | { |
| 626 | return LTTNG_IOCTL_CHECK(fd, LTTNG_RING_BUFFER_INSTANCE_ID, id); |
| 627 | } |