src/lttng-statedump-impl.c

   1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
   2  *
   3  * lttng-statedump.c
   4  *
   5  * Linux Trace Toolkit Next Generation Kernel State Dump
   6  *
   7  * Copyright 2005 Jean-Hugues Deschenes <jean-hugues.deschenes@polymtl.ca>
   8  * Copyright 2006-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   9  *
  10  * Changes:
  11  *      Eric Clement:                   Add listing of network IP interface
  12  *      2006, 2007 Mathieu Desnoyers    Fix kernel threads
  13  *                                      Various updates
  14  */
  15
  16 #include <linux/init.h>
  17 #include <linux/module.h>
  18 #include <linux/netlink.h>
  19 #include <linux/inet.h>
  20 #include <linux/ip.h>
  21 #include <linux/kthread.h>
  22 #include <linux/proc_fs.h>
  23 #include <linux/file.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/irqnr.h>
  26 #include <linux/cpu.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/inetdevice.h>
  29 #include <linux/sched.h>
  30 #include <linux/mm.h>
  31 #include <linux/swap.h>
  32 #include <linux/wait.h>
  33 #include <linux/mutex.h>
  34 #include <linux/device.h>
  35
  36 #include <lttng/events.h>
  37 #include <lttng/tracer.h>
  38 #include <wrapper/irqdesc.h>
  39 #include <wrapper/fdtable.h>
  40 #include <wrapper/namespace.h>
  41 #include <wrapper/irq.h>
  42 #include <wrapper/tracepoint.h>
  43 #include <wrapper/genhd.h>
  44 #include <wrapper/file.h>
  45 #include <wrapper/fdtable.h>
  46
  47 #ifdef CONFIG_LTTNG_HAS_LIST_IRQ
  48 #include <linux/irq.h>
  49 #endif
  50
  51 /* Define the tracepoints, but do not build the probes */
  52 #define CREATE_TRACE_POINTS
  53 #define TRACE_INCLUDE_PATH instrumentation/events
  54 #define TRACE_INCLUDE_FILE lttng-statedump
  55 #define LTTNG_INSTRUMENTATION
  56 #include <instrumentation/events/lttng-statedump.h>
  57
  58 DEFINE_TRACE(lttng_statedump_block_device);
  59 DEFINE_TRACE(lttng_statedump_end);
  60 DEFINE_TRACE(lttng_statedump_interrupt);
  61 DEFINE_TRACE(lttng_statedump_file_descriptor);
  62 DEFINE_TRACE(lttng_statedump_start);
  63 DEFINE_TRACE(lttng_statedump_process_state);
  64 DEFINE_TRACE(lttng_statedump_process_pid_ns);
  65 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0))
  66 DEFINE_TRACE(lttng_statedump_process_cgroup_ns);
  67 #endif
  68 DEFINE_TRACE(lttng_statedump_process_ipc_ns);
  69 #ifndef LTTNG_MNT_NS_MISSING_HEADER
  70 DEFINE_TRACE(lttng_statedump_process_mnt_ns);
  71 #endif
  72 DEFINE_TRACE(lttng_statedump_process_net_ns);
  73 DEFINE_TRACE(lttng_statedump_process_user_ns);
  74 DEFINE_TRACE(lttng_statedump_process_uts_ns);
  75 DEFINE_TRACE(lttng_statedump_process_time_ns);
  76 DEFINE_TRACE(lttng_statedump_network_interface);
  77 #ifdef LTTNG_HAVE_STATEDUMP_CPU_TOPOLOGY
  78 DEFINE_TRACE(lttng_statedump_cpu_topology);
  79 #endif
  80
  81 struct lttng_fd_ctx {
  82         char *page;
  83         struct lttng_session *session;
  84         struct files_struct *files;
  85 };
  86
  87 /*
  88  * Protected by the trace lock.
  89  */
  90 static struct delayed_work cpu_work[NR_CPUS];
  91 static DECLARE_WAIT_QUEUE_HEAD(statedump_wq);
  92 static atomic_t kernel_threads_to_run;
  93
  94 enum lttng_thread_type {
  95         LTTNG_USER_THREAD = 0,
  96         LTTNG_KERNEL_THREAD = 1,
  97 };
  98
  99 enum lttng_execution_mode {
 100         LTTNG_USER_MODE = 0,
 101         LTTNG_SYSCALL = 1,
 102         LTTNG_TRAP = 2,
 103         LTTNG_IRQ = 3,
 104         LTTNG_SOFTIRQ = 4,
 105         LTTNG_MODE_UNKNOWN = 5,
 106 };
 107
 108 enum lttng_execution_submode {
 109         LTTNG_NONE = 0,
 110         LTTNG_UNKNOWN = 1,
 111 };
 112
 113 enum lttng_process_status {
 114         LTTNG_UNNAMED = 0,
 115         LTTNG_WAIT_FORK = 1,
 116         LTTNG_WAIT_CPU = 2,
 117         LTTNG_EXIT = 3,
 118         LTTNG_ZOMBIE = 4,
 119         LTTNG_WAIT = 5,
 120         LTTNG_RUN = 6,
 121         LTTNG_DEAD = 7,
 122 };
 123
 124 static
 125 int lttng_enumerate_block_devices(struct lttng_session *session)
 126 {
 127         struct class *ptr_block_class;
 128         struct device_type *ptr_disk_type;
 129         struct class_dev_iter iter;
 130         struct device *dev;
 131
 132         ptr_block_class = wrapper_get_block_class();
 133         if (!ptr_block_class)
 134                 return -ENOSYS;
 135         ptr_disk_type = wrapper_get_disk_type();
 136         if (!ptr_disk_type) {
 137                 return -ENOSYS;
 138         }
 139         class_dev_iter_init(&iter, ptr_block_class, NULL, ptr_disk_type);
 140         while ((dev = class_dev_iter_next(&iter))) {
 141                 struct disk_part_iter piter;
 142                 struct gendisk *disk = dev_to_disk(dev);
 143                 struct hd_struct *part;
 144
 145                 /*
 146                  * Don't show empty devices or things that have been
 147                  * suppressed
 148                  */
 149                 if (get_capacity(disk) == 0 ||
 150                     (disk->flags & GENHD_FL_SUPPRESS_PARTITION_INFO))
 151                         continue;
 152
 153                 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
 154                 while ((part = disk_part_iter_next(&piter))) {
 155                         struct block_device bdev;
 156                         char name_buf[BDEVNAME_SIZE];
 157                         const char *p;
 158
 159                         /*
 160                          * Create a partial 'struct blockdevice' to use
 161                          * 'bdevname()' which is a simple wrapper over
 162                          * 'disk_name()' but has the honor to be EXPORT_SYMBOL.
 163                          */
 164                         bdev.bd_disk = disk;
 165                         bdev.bd_part = part;
 166
 167                         p = bdevname(&bdev, name_buf);
 168                         if (!p) {
 169                                 disk_part_iter_exit(&piter);
 170                                 class_dev_iter_exit(&iter);
 171                                 return -ENOSYS;
 172                         }
 173                         trace_lttng_statedump_block_device(session,
 174                                         part_devt(part), name_buf);
 175                 }
 176                 disk_part_iter_exit(&piter);
 177         }
 178         class_dev_iter_exit(&iter);
 179         return 0;
 180 }
 181
 182 #ifdef CONFIG_INET
 183
 184 static
 185 void lttng_enumerate_device(struct lttng_session *session,
 186                 struct net_device *dev)
 187 {
 188         struct in_device *in_dev;
 189         struct in_ifaddr *ifa;
 190
 191         if (dev->flags & IFF_UP) {
 192                 in_dev = in_dev_get(dev);
 193                 if (in_dev) {
 194                         for (ifa = in_dev->ifa_list; ifa != NULL;
 195                              ifa = ifa->ifa_next) {
 196                                 trace_lttng_statedump_network_interface(
 197                                         session, dev, ifa);
 198                         }
 199                         in_dev_put(in_dev);
 200                 }
 201         } else {
 202                 trace_lttng_statedump_network_interface(
 203                         session, dev, NULL);
 204         }
 205 }
 206
 207 static
 208 int lttng_enumerate_network_ip_interface(struct lttng_session *session)
 209 {
 210         struct net_device *dev;
 211
 212         read_lock(&dev_base_lock);
 213         for_each_netdev(&init_net, dev)
 214                 lttng_enumerate_device(session, dev);
 215         read_unlock(&dev_base_lock);
 216
 217         return 0;
 218 }
 219 #else /* CONFIG_INET */
 220 static inline
 221 int lttng_enumerate_network_ip_interface(struct lttng_session *session)
 222 {
 223         return 0;
 224 }
 225 #endif /* CONFIG_INET */
 226
 227 static
 228 int lttng_dump_one_fd(const void *p, struct file *file, unsigned int fd)
 229 {
 230         const struct lttng_fd_ctx *ctx = p;
 231         const char *s = d_path(&file->f_path, ctx->page, PAGE_SIZE);
 232         unsigned int flags = file->f_flags;
 233         struct fdtable *fdt;
 234
 235         /*
 236          * We don't expose kernel internal flags, only userspace-visible
 237          * flags.
 238          */
 239         flags &= ~FMODE_NONOTIFY;
 240         fdt = files_fdtable(ctx->files);
 241         /*
 242          * We need to check here again whether fd is within the fdt
 243          * max_fds range, because we might be seeing a different
 244          * files_fdtable() than iterate_fd(), assuming only RCU is
 245          * protecting the read. In reality, iterate_fd() holds
 246          * file_lock, which should ensure the fdt does not change while
 247          * the lock is taken, but we are not aware whether this is
 248          * guaranteed or not, so play safe.
 249          */
 250         if (fd < fdt->max_fds && lttng_close_on_exec(fd, fdt))
 251                 flags |= O_CLOEXEC;
 252         if (IS_ERR(s)) {
 253                 struct dentry *dentry = file->f_path.dentry;
 254
 255                 /* Make sure we give at least some info */
 256                 spin_lock(&dentry->d_lock);
 257                 trace_lttng_statedump_file_descriptor(ctx->session,
 258                         ctx->files, fd, dentry->d_name.name, flags,
 259                         file->f_mode);
 260                 spin_unlock(&dentry->d_lock);
 261                 goto end;
 262         }
 263         trace_lttng_statedump_file_descriptor(ctx->session,
 264                 ctx->files, fd, s, flags, file->f_mode);
 265 end:
 266         return 0;
 267 }
 268
 269 /* Called with task lock held. */
 270 static
 271 void lttng_enumerate_files(struct lttng_session *session,
 272                 struct files_struct *files,
 273                 char *tmp)
 274 {
 275         struct lttng_fd_ctx ctx = { .page = tmp, .session = session, .files = files, };
 276
 277         lttng_iterate_fd(files, 0, lttng_dump_one_fd, &ctx);
 278 }
 279
 280 #ifdef LTTNG_HAVE_STATEDUMP_CPU_TOPOLOGY
 281 static
 282 int lttng_enumerate_cpu_topology(struct lttng_session *session)
 283 {
 284         int cpu;
 285         const cpumask_t *cpumask = cpu_possible_mask;
 286
 287         for (cpu = cpumask_first(cpumask); cpu < nr_cpu_ids;
 288                         cpu = cpumask_next(cpu, cpumask)) {
 289                 trace_lttng_statedump_cpu_topology(session, &cpu_data(cpu));
 290         }
 291
 292         return 0;
 293 }
 294 #else
 295 static
 296 int lttng_enumerate_cpu_topology(struct lttng_session *session)
 297 {
 298         return 0;
 299 }
 300 #endif
 301
 302 #if 0
 303 /*
 304  * FIXME: we cannot take a mmap_sem while in a RCU read-side critical section
 305  * (scheduling in atomic). Normally, the tasklist lock protects this kind of
 306  * iteration, but it is not exported to modules.
 307  */
 308 static
 309 void lttng_enumerate_task_vm_maps(struct lttng_session *session,
 310                 struct task_struct *p)
 311 {
 312         struct mm_struct *mm;
 313         struct vm_area_struct *map;
 314         unsigned long ino;
 315
 316         /* get_task_mm does a task_lock... */
 317         mm = get_task_mm(p);
 318         if (!mm)
 319                 return;
 320
 321         map = mm->mmap;
 322         if (map) {
 323                 down_read(&mm->mmap_sem);
 324                 while (map) {
 325                         if (map->vm_file)
 326                                 ino = map->vm_file->lttng_f_dentry->d_inode->i_ino;
 327                         else
 328                                 ino = 0;
 329                         trace_lttng_statedump_vm_map(session, p, map, ino);
 330                         map = map->vm_next;
 331                 }
 332                 up_read(&mm->mmap_sem);
 333         }
 334         mmput(mm);
 335 }
 336
 337 static
 338 int lttng_enumerate_vm_maps(struct lttng_session *session)
 339 {
 340         struct task_struct *p;
 341
 342         rcu_read_lock();
 343         for_each_process(p)
 344                 lttng_enumerate_task_vm_maps(session, p);
 345         rcu_read_unlock();
 346         return 0;
 347 }
 348 #endif
 349
 350 #ifdef CONFIG_LTTNG_HAS_LIST_IRQ
 351
 352 static
 353 int lttng_list_interrupts(struct lttng_session *session)
 354 {
 355         unsigned int irq;
 356         unsigned long flags = 0;
 357         struct irq_desc *desc;
 358
 359 #define irq_to_desc     wrapper_irq_to_desc
 360         /* needs irq_desc */
 361         for_each_irq_desc(irq, desc) {
 362                 struct irqaction *action;
 363                 const char *irq_chip_name =
 364                         irq_desc_get_chip(desc)->name ? : "unnamed_irq_chip";
 365
 366                 local_irq_save(flags);
 367                 raw_spin_lock(&desc->lock);
 368                 for (action = desc->action; action; action = action->next) {
 369                         trace_lttng_statedump_interrupt(session,
 370                                 irq, irq_chip_name, action);
 371                 }
 372                 raw_spin_unlock(&desc->lock);
 373                 local_irq_restore(flags);
 374         }
 375         return 0;
 376 #undef irq_to_desc
 377 }
 378 #else
 379 static inline
 380 int lttng_list_interrupts(struct lttng_session *session)
 381 {
 382         return 0;
 383 }
 384 #endif
 385
 386 /*
 387  * Statedump the task's namespaces using the proc filesystem inode number as
 388  * the unique identifier. The user and pid ns are nested and will be dumped
 389  * recursively.
 390  *
 391  * Called with task lock held.
 392  */
 393 static
 394 void lttng_statedump_process_ns(struct lttng_session *session,
 395                 struct task_struct *p,
 396                 enum lttng_thread_type type,
 397                 enum lttng_execution_mode mode,
 398                 enum lttng_execution_submode submode,
 399                 enum lttng_process_status status)
 400 {
 401         struct nsproxy *proxy;
 402         struct pid_namespace *pid_ns;
 403         struct user_namespace *user_ns;
 404
 405         /*
 406          * The pid and user namespaces are special, they are nested and
 407          * accessed with specific functions instead of the nsproxy struct
 408          * like the other namespaces.
 409          */
 410         pid_ns = task_active_pid_ns(p);
 411         do {
 412                 trace_lttng_statedump_process_pid_ns(session, p, pid_ns);
 413                 pid_ns = pid_ns ? pid_ns->parent : NULL;
 414         } while (pid_ns);
 415
 416
 417         user_ns = task_cred_xxx(p, user_ns);
 418         do {
 419                 trace_lttng_statedump_process_user_ns(session, p, user_ns);
 420                 /*
 421                  * trace_lttng_statedump_process_user_ns() internally
 422                  * checks whether user_ns is NULL. While this does not
 423                  * appear to be a possible return value for
 424                  * task_cred_xxx(), err on the safe side and check
 425                  * for NULL here as well to be consistent with the
 426                  * paranoid behavior of
 427                  * trace_lttng_statedump_process_user_ns().
 428                  */
 429                 user_ns = user_ns ? user_ns->lttng_user_ns_parent : NULL;
 430         } while (user_ns);
 431
 432         /*
 433          * Back and forth on locking strategy within Linux upstream for nsproxy.
 434          * See Linux upstream commit 728dba3a39c66b3d8ac889ddbe38b5b1c264aec3
 435          * "namespaces: Use task_lock and not rcu to protect nsproxy"
 436          * for details.
 437          */
 438 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0) || \
 439                 LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,36, 3,14,0,0) || \
 440                 LTTNG_UBUNTU_KERNEL_RANGE(3,16,1,11, 3,17,0,0) || \
 441                 LTTNG_RHEL_KERNEL_RANGE(3,10,0,229,13,0, 3,11,0,0,0,0))
 442         proxy = p->nsproxy;
 443 #else
 444         rcu_read_lock();
 445         proxy = task_nsproxy(p);
 446 #endif
 447         if (proxy) {
 448 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0))
 449                 trace_lttng_statedump_process_cgroup_ns(session, p, proxy->cgroup_ns);
 450 #endif
 451                 trace_lttng_statedump_process_ipc_ns(session, p, proxy->ipc_ns);
 452 #ifndef LTTNG_MNT_NS_MISSING_HEADER
 453                 trace_lttng_statedump_process_mnt_ns(session, p, proxy->mnt_ns);
 454 #endif
 455                 trace_lttng_statedump_process_net_ns(session, p, proxy->net_ns);
 456                 trace_lttng_statedump_process_uts_ns(session, p, proxy->uts_ns);
 457 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
 458                 trace_lttng_statedump_process_time_ns(session, p, proxy->time_ns);
 459 #endif
 460         }
 461 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,17,0) || \
 462                 LTTNG_UBUNTU_KERNEL_RANGE(3,13,11,36, 3,14,0,0) || \
 463                 LTTNG_UBUNTU_KERNEL_RANGE(3,16,1,11, 3,17,0,0) || \
 464                 LTTNG_RHEL_KERNEL_RANGE(3,10,0,229,13,0, 3,11,0,0,0,0))
 465         /* (nothing) */
 466 #else
 467         rcu_read_unlock();
 468 #endif
 469 }
 470
 471 static
 472 int lttng_enumerate_process_states(struct lttng_session *session)
 473 {
 474         struct task_struct *g, *p;
 475         char *tmp;
 476
 477         tmp = (char *) __get_free_page(GFP_KERNEL);
 478         if (!tmp)
 479                 return -ENOMEM;
 480
 481         rcu_read_lock();
 482         for_each_process(g) {
 483                 struct files_struct *prev_files = NULL;
 484
 485                 p = g;
 486                 do {
 487                         enum lttng_execution_mode mode =
 488                                 LTTNG_MODE_UNKNOWN;
 489                         enum lttng_execution_submode submode =
 490                                 LTTNG_UNKNOWN;
 491                         enum lttng_process_status status;
 492                         enum lttng_thread_type type;
 493                         struct files_struct *files;
 494
 495                         task_lock(p);
 496                         if (p->exit_state == EXIT_ZOMBIE)
 497                                 status = LTTNG_ZOMBIE;
 498                         else if (p->exit_state == EXIT_DEAD)
 499                                 status = LTTNG_DEAD;
 500                         else if (p->state == TASK_RUNNING) {
 501                                 /* Is this a forked child that has not run yet? */
 502                                 if (list_empty(&p->rt.run_list))
 503                                         status = LTTNG_WAIT_FORK;
 504                                 else
 505                                         /*
 506                                          * All tasks are considered as wait_cpu;
 507                                          * the viewer will sort out if the task
 508                                          * was really running at this time.
 509                                          */
 510                                         status = LTTNG_WAIT_CPU;
 511                         } else if (p->state &
 512                                 (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)) {
 513                                 /* Task is waiting for something to complete */
 514                                 status = LTTNG_WAIT;
 515                         } else
 516                                 status = LTTNG_UNNAMED;
 517                         submode = LTTNG_NONE;
 518
 519                         /*
 520                          * Verification of t->mm is to filter out kernel
 521                          * threads; Viewer will further filter out if a
 522                          * user-space thread was in syscall mode or not.
 523                          */
 524                         if (p->mm)
 525                                 type = LTTNG_USER_THREAD;
 526                         else
 527                                 type = LTTNG_KERNEL_THREAD;
 528                         files = p->files;
 529
 530                         trace_lttng_statedump_process_state(session,
 531                                 p, type, mode, submode, status, files);
 532                         lttng_statedump_process_ns(session,
 533                                 p, type, mode, submode, status);
 534                         /*
 535                          * As an optimisation for the common case, do not
 536                          * repeat information for the same files_struct in
 537                          * two consecutive threads. This is the common case
 538                          * for threads sharing the same fd table. RCU guarantees
 539                          * that the same files_struct pointer is not re-used
 540                          * throughout processes/threads iteration.
 541                          */
 542                         if (files && files != prev_files) {
 543                                 lttng_enumerate_files(session, files, tmp);
 544                                 prev_files = files;
 545                         }
 546                         task_unlock(p);
 547                 } while_each_thread(g, p);
 548         }
 549         rcu_read_unlock();
 550
 551         free_page((unsigned long) tmp);
 552
 553         return 0;
 554 }
 555
 556 static
 557 void lttng_statedump_work_func(struct work_struct *work)
 558 {
 559         if (atomic_dec_and_test(&kernel_threads_to_run))
 560                 /* If we are the last thread, wake up do_lttng_statedump */
 561                 wake_up(&statedump_wq);
 562 }
 563
 564 static
 565 int do_lttng_statedump(struct lttng_session *session)
 566 {
 567         int cpu, ret;
 568
 569         trace_lttng_statedump_start(session);
 570         ret = lttng_enumerate_process_states(session);
 571         if (ret)
 572                 return ret;
 573         /*
 574          * FIXME
 575          * ret = lttng_enumerate_vm_maps(session);
 576          * if (ret)
 577          *      return ret;
 578          */
 579         ret = lttng_list_interrupts(session);
 580         if (ret)
 581                 return ret;
 582         ret = lttng_enumerate_network_ip_interface(session);
 583         if (ret)
 584                 return ret;
 585         ret = lttng_enumerate_block_devices(session);
 586         switch (ret) {
 587         case 0:
 588                 break;
 589         case -ENOSYS:
 590                 printk(KERN_WARNING "LTTng: block device enumeration is not supported by kernel\n");
 591                 break;
 592         default:
 593                 return ret;
 594         }
 595         ret = lttng_enumerate_cpu_topology(session);
 596         if (ret)
 597                 return ret;
 598
 599         /* TODO lttng_dump_idt_table(session); */
 600         /* TODO lttng_dump_softirq_vec(session); */
 601         /* TODO lttng_list_modules(session); */
 602         /* TODO lttng_dump_swap_files(session); */
 603
 604         /*
 605          * Fire off a work queue on each CPU. Their sole purpose in life
 606          * is to guarantee that each CPU has been in a state where is was in
 607          * syscall mode (i.e. not in a trap, an IRQ or a soft IRQ).
 608          */
 609         get_online_cpus();
 610         atomic_set(&kernel_threads_to_run, num_online_cpus());
 611         for_each_online_cpu(cpu) {
 612                 INIT_DELAYED_WORK(&cpu_work[cpu], lttng_statedump_work_func);
 613                 schedule_delayed_work_on(cpu, &cpu_work[cpu], 0);
 614         }
 615         /* Wait for all threads to run */
 616         __wait_event(statedump_wq, (atomic_read(&kernel_threads_to_run) == 0));
 617         put_online_cpus();
 618         /* Our work is done */
 619         trace_lttng_statedump_end(session);
 620         return 0;
 621 }
 622
 623 /*
 624  * Called with session mutex held.
 625  */
 626 int lttng_statedump_start(struct lttng_session *session)
 627 {
 628         return do_lttng_statedump(session);
 629 }
 630 EXPORT_SYMBOL_GPL(lttng_statedump_start);
 631
 632 static
 633 int __init lttng_statedump_init(void)
 634 {
 635         /*
 636          * Allow module to load even if the fixup cannot be done. This
 637          * will allow seemless transition when the underlying issue fix
 638          * is merged into the Linux kernel, and when tracepoint.c
 639          * "tracepoint_module_notify" is turned into a static function.
 640          */
 641         (void) wrapper_lttng_fixup_sig(THIS_MODULE);
 642         return 0;
 643 }
 644
 645 module_init(lttng_statedump_init);
 646
 647 static
 648 void __exit lttng_statedump_exit(void)
 649 {
 650 }
 651
 652 module_exit(lttng_statedump_exit);
 653
 654 MODULE_LICENSE("GPL and additional rights");
 655 MODULE_AUTHOR("Jean-Hugues Deschenes");
 656 MODULE_DESCRIPTION("LTTng statedump provider");
 657 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
 658         __stringify(LTTNG_MODULES_MINOR_VERSION) "."
 659         __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
 660         LTTNG_MODULES_EXTRAVERSION);