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libuv/src/unix/fsevents.c  view on Meta::CPAN

 * with old versions of gcc.
 */
#define kFSEventsModified (kFSEventStreamEventFlagItemFinderInfoMod |         \
                           kFSEventStreamEventFlagItemModified |              \
                           kFSEventStreamEventFlagItemInodeMetaMod |          \
                           kFSEventStreamEventFlagItemChangeOwner |           \
                           kFSEventStreamEventFlagItemXattrMod)

#define kFSEventsRenamed  (kFSEventStreamEventFlagItemCreated |               \
                           kFSEventStreamEventFlagItemRemoved |               \
                           kFSEventStreamEventFlagItemRenamed)

#define kFSEventsSystem   (kFSEventStreamEventFlagUserDropped |               \
                           kFSEventStreamEventFlagKernelDropped |             \
                           kFSEventStreamEventFlagEventIdsWrapped |           \
                           kFSEventStreamEventFlagHistoryDone |               \
                           kFSEventStreamEventFlagMount |                     \
                           kFSEventStreamEventFlagUnmount |                   \
                           kFSEventStreamEventFlagRootChanged)

typedef struct uv__fsevents_event_s uv__fsevents_event_t;
typedef struct uv__cf_loop_signal_s uv__cf_loop_signal_t;
typedef struct uv__cf_loop_state_s uv__cf_loop_state_t;

enum uv__cf_loop_signal_type_e {
  kUVCFLoopSignalRegular,
  kUVCFLoopSignalClosing
};
typedef enum uv__cf_loop_signal_type_e uv__cf_loop_signal_type_t;

struct uv__cf_loop_signal_s {
  QUEUE member;
  uv_fs_event_t* handle;
  uv__cf_loop_signal_type_t type;
};

struct uv__fsevents_event_s {
  QUEUE member;
  int events;
  char path[1];
};

struct uv__cf_loop_state_s {
  CFRunLoopRef loop;
  CFRunLoopSourceRef signal_source;
  int fsevent_need_reschedule;
  FSEventStreamRef fsevent_stream;
  uv_sem_t fsevent_sem;
  uv_mutex_t fsevent_mutex;
  void* fsevent_handles[2];
  unsigned int fsevent_handle_count;
};

/* Forward declarations */
static void uv__cf_loop_cb(void* arg);
static void* uv__cf_loop_runner(void* arg);
static int uv__cf_loop_signal(uv_loop_t* loop,
                              uv_fs_event_t* handle,
                              uv__cf_loop_signal_type_t type);

/* Lazy-loaded by uv__fsevents_global_init(). */
static CFArrayRef (*pCFArrayCreate)(CFAllocatorRef,
                                    const void**,
                                    CFIndex,
                                    const CFArrayCallBacks*);
static void (*pCFRelease)(CFTypeRef);
static void (*pCFRunLoopAddSource)(CFRunLoopRef,
                                   CFRunLoopSourceRef,
                                   CFStringRef);
static CFRunLoopRef (*pCFRunLoopGetCurrent)(void);
static void (*pCFRunLoopRemoveSource)(CFRunLoopRef,
                                      CFRunLoopSourceRef,
                                      CFStringRef);
static void (*pCFRunLoopRun)(void);
static CFRunLoopSourceRef (*pCFRunLoopSourceCreate)(CFAllocatorRef,
                                                    CFIndex,
                                                    CFRunLoopSourceContext*);
static void (*pCFRunLoopSourceSignal)(CFRunLoopSourceRef);
static void (*pCFRunLoopStop)(CFRunLoopRef);
static void (*pCFRunLoopWakeUp)(CFRunLoopRef);
static CFStringRef (*pCFStringCreateWithFileSystemRepresentation)(
    CFAllocatorRef,
    const char*);
static CFStringEncoding (*pCFStringGetSystemEncoding)(void);
static CFStringRef (*pkCFRunLoopDefaultMode);
static FSEventStreamRef (*pFSEventStreamCreate)(CFAllocatorRef,
                                                FSEventStreamCallback,
                                                FSEventStreamContext*,
                                                CFArrayRef,
                                                FSEventStreamEventId,
                                                CFTimeInterval,
                                                FSEventStreamCreateFlags);
static void (*pFSEventStreamFlushSync)(FSEventStreamRef);
static void (*pFSEventStreamInvalidate)(FSEventStreamRef);
static void (*pFSEventStreamRelease)(FSEventStreamRef);
static void (*pFSEventStreamScheduleWithRunLoop)(FSEventStreamRef,
                                                 CFRunLoopRef,
                                                 CFStringRef);
static Boolean (*pFSEventStreamStart)(FSEventStreamRef);
static void (*pFSEventStreamStop)(FSEventStreamRef);

#define UV__FSEVENTS_PROCESS(handle, block)                                   \
    do {                                                                      \
      QUEUE events;                                                           \
      QUEUE* q;                                                               \
      uv__fsevents_event_t* event;                                            \
      int err;                                                                \
      uv_mutex_lock(&(handle)->cf_mutex);                                     \
      /* Split-off all events and empty original queue */                     \
      QUEUE_MOVE(&(handle)->cf_events, &events);                              \
      /* Get error (if any) and zero original one */                          \
      err = (handle)->cf_error;                                               \
      (handle)->cf_error = 0;                                                 \
      uv_mutex_unlock(&(handle)->cf_mutex);                                   \
      /* Loop through events, deallocating each after processing */           \
      while (!QUEUE_EMPTY(&events)) {                                         \
        q = QUEUE_HEAD(&events);                                              \
        event = QUEUE_DATA(q, uv__fsevents_event_t, member);                  \
        QUEUE_REMOVE(q);                                                      \
        /* NOTE: Checking uv__is_active() is required here, because handle    \
         * callback may close handle and invoking it after it will lead to    \

libuv/src/unix/fsevents.c  view on Meta::CPAN

    q = &state->fsevent_handles;
    for (; i < path_count; i++) {
      q = QUEUE_NEXT(q);
      assert(q != &state->fsevent_handles);
      curr = QUEUE_DATA(q, uv_fs_event_t, cf_member);

      assert(curr->realpath != NULL);
      paths[i] =
          pCFStringCreateWithFileSystemRepresentation(NULL, curr->realpath);
      if (paths[i] == NULL) {
        uv_mutex_unlock(&state->fsevent_mutex);
        goto final;
      }
    }
  }
  uv_mutex_unlock(&state->fsevent_mutex);
  err = 0;

  if (path_count != 0) {
    /* Create new FSEventStream */
    cf_paths = pCFArrayCreate(NULL, (const void**) paths, path_count, NULL);
    if (cf_paths == NULL) {
      err = UV_ENOMEM;
      goto final;
    }
    err = uv__fsevents_create_stream(handle->loop, cf_paths);
  }

final:
  /* Deallocate all paths in case of failure */
  if (err != 0) {
    if (cf_paths == NULL) {
      while (i != 0)
        pCFRelease(paths[--i]);
      uv__free(paths);
    } else {
      /* CFArray takes ownership of both strings and original C-array */
      pCFRelease(cf_paths);
    }

    /* Broadcast error to all handles */
    uv_mutex_lock(&state->fsevent_mutex);
    QUEUE_FOREACH(q, &state->fsevent_handles) {
      curr = QUEUE_DATA(q, uv_fs_event_t, cf_member);
      uv__fsevents_push_event(curr, NULL, err);
    }
    uv_mutex_unlock(&state->fsevent_mutex);
  }

  /*
   * Main thread will block until the removal of handle from the list,
   * we must tell it when we're ready.
   *
   * NOTE: This is coupled with `uv_sem_wait()` in `uv__fsevents_close`
   */
  if (type == kUVCFLoopSignalClosing)
    uv_sem_post(&state->fsevent_sem);
}


static int uv__fsevents_global_init(void) {
  static pthread_mutex_t global_init_mutex = PTHREAD_MUTEX_INITIALIZER;
  static void* core_foundation_handle;
  static void* core_services_handle;
  int err;

  err = 0;
  pthread_mutex_lock(&global_init_mutex);
  if (core_foundation_handle != NULL)
    goto out;

  /* The libraries are never unloaded because we currently don't have a good
   * mechanism for keeping a reference count. It's unlikely to be an issue
   * but if it ever becomes one, we can turn the dynamic library handles into
   * per-event loop properties and have the dynamic linker keep track for us.
   */
  err = UV_ENOSYS;
  core_foundation_handle = dlopen("/System/Library/Frameworks/"
                                  "CoreFoundation.framework/"
                                  "Versions/A/CoreFoundation",
                                  RTLD_LAZY | RTLD_LOCAL);
  if (core_foundation_handle == NULL)
    goto out;

  core_services_handle = dlopen("/System/Library/Frameworks/"
                                "CoreServices.framework/"
                                "Versions/A/CoreServices",
                                RTLD_LAZY | RTLD_LOCAL);
  if (core_services_handle == NULL)
    goto out;

  err = UV_ENOENT;
#define V(handle, symbol)                                                     \
  do {                                                                        \
    *(void **)(&p ## symbol) = dlsym((handle), #symbol);                      \
    if (p ## symbol == NULL)                                                  \
      goto out;                                                               \
  }                                                                           \
  while (0)
  V(core_foundation_handle, CFArrayCreate);
  V(core_foundation_handle, CFRelease);
  V(core_foundation_handle, CFRunLoopAddSource);
  V(core_foundation_handle, CFRunLoopGetCurrent);
  V(core_foundation_handle, CFRunLoopRemoveSource);
  V(core_foundation_handle, CFRunLoopRun);
  V(core_foundation_handle, CFRunLoopSourceCreate);
  V(core_foundation_handle, CFRunLoopSourceSignal);
  V(core_foundation_handle, CFRunLoopStop);
  V(core_foundation_handle, CFRunLoopWakeUp);
  V(core_foundation_handle, CFStringCreateWithFileSystemRepresentation);
  V(core_foundation_handle, CFStringGetSystemEncoding);
  V(core_foundation_handle, kCFRunLoopDefaultMode);
  V(core_services_handle, FSEventStreamCreate);
  V(core_services_handle, FSEventStreamFlushSync);
  V(core_services_handle, FSEventStreamInvalidate);
  V(core_services_handle, FSEventStreamRelease);
  V(core_services_handle, FSEventStreamScheduleWithRunLoop);
  V(core_services_handle, FSEventStreamStart);
  V(core_services_handle, FSEventStreamStop);
#undef V
  err = 0;

out:
  if (err && core_services_handle != NULL) {
    dlclose(core_services_handle);
    core_services_handle = NULL;
  }

  if (err && core_foundation_handle != NULL) {
    dlclose(core_foundation_handle);
    core_foundation_handle = NULL;
  }

  pthread_mutex_unlock(&global_init_mutex);
  return err;
}


/* Runs in UV loop */
static int uv__fsevents_loop_init(uv_loop_t* loop) {
  CFRunLoopSourceContext ctx;
  uv__cf_loop_state_t* state;
  pthread_attr_t attr_storage;
  pthread_attr_t* attr;
  int err;

  if (loop->cf_state != NULL)
    return 0;

  err = uv__fsevents_global_init();
  if (err)
    return err;

  state = uv__calloc(1, sizeof(*state));
  if (state == NULL)
    return UV_ENOMEM;

  err = uv_mutex_init(&loop->cf_mutex);
  if (err)
    goto fail_mutex_init;

  err = uv_sem_init(&loop->cf_sem, 0);
  if (err)
    goto fail_sem_init;

  QUEUE_INIT(&loop->cf_signals);

  err = uv_sem_init(&state->fsevent_sem, 0);
  if (err)
    goto fail_fsevent_sem_init;

  err = uv_mutex_init(&state->fsevent_mutex);
  if (err)
    goto fail_fsevent_mutex_init;

  QUEUE_INIT(&state->fsevent_handles);
  state->fsevent_need_reschedule = 0;
  state->fsevent_handle_count = 0;

  memset(&ctx, 0, sizeof(ctx));
  ctx.info = loop;
  ctx.perform = uv__cf_loop_cb;
  state->signal_source = pCFRunLoopSourceCreate(NULL, 0, &ctx);
  if (state->signal_source == NULL) {
    err = UV_ENOMEM;
    goto fail_signal_source_create;
  }

  /* In the unlikely event that pthread_attr_init() fails, create the thread
   * with the default stack size. We'll use a little more address space but
   * that in itself is not a fatal error.
   */
  attr = &attr_storage;
  if (pthread_attr_init(attr))
    attr = NULL;

  if (attr != NULL)
    if (pthread_attr_setstacksize(attr, 4 * PTHREAD_STACK_MIN))
      abort();

  loop->cf_state = state;

  /* uv_thread_t is an alias for pthread_t. */
  err = UV__ERR(pthread_create(&loop->cf_thread, attr, uv__cf_loop_runner, loop));

  if (attr != NULL)
    pthread_attr_destroy(attr);

  if (err)
    goto fail_thread_create;