/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "uv.h"
#include "internal.h"
#if TARGET_OS_IPHONE || MAC_OS_X_VERSION_MAX_ALLOWED < 1070
/* iOS (currently) doesn't provide the FSEvents-API (nor CoreServices) */
/* macOS prior to 10.7 doesn't provide the full FSEvents API so use kqueue */
int uv__fsevents_init(uv_fs_event_t* handle) {
return 0;
}
int uv__fsevents_close(uv_fs_event_t* handle) {
return 0;
}
void uv__fsevents_loop_delete(uv_loop_t* loop) {
}
#else /* TARGET_OS_IPHONE */
#include "darwin-stub.h"
#include <dlfcn.h>
#include <assert.h>
#include <stdlib.h>
#include <pthread.h>
static const int kFSEventsModified =
kFSEventStreamEventFlagItemChangeOwner |
kFSEventStreamEventFlagItemFinderInfoMod |
kFSEventStreamEventFlagItemInodeMetaMod |
kFSEventStreamEventFlagItemModified |
kFSEventStreamEventFlagItemXattrMod;
static const int kFSEventsRenamed =
kFSEventStreamEventFlagItemCreated |
kFSEventStreamEventFlagItemRemoved |
kFSEventStreamEventFlagItemRenamed;
static const int 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 int (*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 \
* incorrect behaviour */ \
if (!uv__is_closing((handle)) && uv__is_active((handle))) \
block \
/* Free allocated data */ \
uv__free(event); \
} \
if (err != 0 && !uv__is_closing((handle)) && uv__is_active((handle))) \
(handle)->cb((handle), NULL, 0, err); \
} while (0)
/* Runs in UV loop's thread, when there're events to report to handle */
static void uv__fsevents_cb(uv_async_t* cb) {
uv_fs_event_t* handle;
handle = cb->data;
UV__FSEVENTS_PROCESS(handle, {
handle->cb(handle, event->path[0] ? event->path : NULL, event->events, 0);
});
}
/* Runs in CF thread, pushed event into handle's event list */
static void uv__fsevents_push_event(uv_fs_event_t* handle,
QUEUE* events,
int err) {
assert(events != NULL || err != 0);
uv_mutex_lock(&handle->cf_mutex);
/* Concatenate two queues */
if (events != NULL)
QUEUE_ADD(&handle->cf_events, events);
/* Propagate error */
if (err != 0)
handle->cf_error = err;
uv_mutex_unlock(&handle->cf_mutex);
uv_async_send(handle->cf_cb);
}
/* Runs in CF thread, when there're events in FSEventStream */
static void uv__fsevents_event_cb(const FSEventStreamRef streamRef,
void* info,
size_t numEvents,
void* eventPaths,
const FSEventStreamEventFlags eventFlags[],
const FSEventStreamEventId eventIds[]) {
size_t i;
int len;
char** paths;
char* path;
char* pos;
uv_fs_event_t* handle;
QUEUE* q;
uv_loop_t* loop;
uv__cf_loop_state_t* state;
uv__fsevents_event_t* event;
FSEventStreamEventFlags flags;
QUEUE head;
loop = info;
state = loop->cf_state;
assert(state != NULL);
paths = eventPaths;
/* For each handle */
uv_mutex_lock(&state->fsevent_mutex);
QUEUE_FOREACH(q, &state->fsevent_handles) {
handle = QUEUE_DATA(q, uv_fs_event_t, cf_member);
QUEUE_INIT(&head);
/* Process and filter out events */
for (i = 0; i < numEvents; i++) {
flags = eventFlags[i];
/* Ignore system events */
if (flags & kFSEventsSystem)
continue;
path = paths[i];
len = strlen(path);
if (handle->realpath_len == 0)
continue; /* This should be unreachable */
/* Filter out paths that are outside handle's request */
if (len < handle->realpath_len)
continue;
/* Make sure that realpath actually named a directory,
* (unless watching root, which alone keeps a trailing slash on the realpath)
* or that we matched the whole string */
if (handle->realpath_len != len &&
handle->realpath_len > 1 &&
path[handle->realpath_len] != '/')
continue;
if (memcmp(path, handle->realpath, handle->realpath_len) != 0)
continue;
if (!(handle->realpath_len == 1 && handle->realpath[0] == '/')) {
/* Remove common prefix, unless the watched folder is "/" */
path += handle->realpath_len;
len -= handle->realpath_len;
/* Ignore events with path equal to directory itself */
if (len <= 1 && (flags & kFSEventStreamEventFlagItemIsDir))
continue;
if (len == 0) {
/* Since we're using fsevents to watch the file itself,
* realpath == path, and we now need to get the basename of the file back
* (for commonality with other codepaths and platforms). */
while (len < handle->realpath_len && path[-1] != '/') {
path--;
len++;
}
/* Created and Removed seem to be always set, but don't make sense */
flags &= ~kFSEventsRenamed;
} else {
/* Skip forward slash */
path++;
len--;
}
}
/* Do not emit events from subdirectories (without option set) */
if ((handle->cf_flags & UV_FS_EVENT_RECURSIVE) == 0 && *path != '\0') {
pos = strchr(path + 1, '/');
if (pos != NULL)
continue;
}
event = uv__malloc(sizeof(*event) + len);
if (event == NULL)
break;
memset(event, 0, sizeof(*event));
memcpy(event->path, path, len + 1);
event->events = UV_RENAME;
if (0 == (flags & kFSEventsRenamed)) {
if (0 != (flags & kFSEventsModified) ||
0 == (flags & kFSEventStreamEventFlagItemIsDir))
event->events = UV_CHANGE;
}
QUEUE_INSERT_TAIL(&head, &event->member);
}
if (!QUEUE_EMPTY(&head))
uv__fsevents_push_event(handle, &head, 0);
}
uv_mutex_unlock(&state->fsevent_mutex);
}
/* Runs in CF thread */
static int uv__fsevents_create_stream(uv_loop_t* loop, CFArrayRef paths) {
uv__cf_loop_state_t* state;
FSEventStreamContext ctx;
FSEventStreamRef ref;
CFAbsoluteTime latency;
FSEventStreamCreateFlags flags;
/* Initialize context */
memset(&ctx, 0, sizeof(ctx));
ctx.info = loop;
latency = 0.05;
/* Explanation of selected flags:
* 1. NoDefer - without this flag, events that are happening continuously
* (i.e. each event is happening after time interval less than `latency`,
* counted from previous event), will be deferred and passed to callback
* once they'll either fill whole OS buffer, or when this continuous stream
* will stop (i.e. there'll be delay between events, bigger than
* `latency`).
* Specifying this flag will invoke callback after `latency` time passed
* since event.
* 2. FileEvents - fire callback for file changes too (by default it is firing
* it only for directory changes).
*/
flags = kFSEventStreamCreateFlagNoDefer | kFSEventStreamCreateFlagFileEvents;
/*
* NOTE: It might sound like a good idea to remember last seen StreamEventId,
* but in reality one dir might have last StreamEventId less than, the other,
* that is being watched now. Which will cause FSEventStream API to report
* changes to files from the past.
*/
ref = pFSEventStreamCreate(NULL,
&uv__fsevents_event_cb,
&ctx,
paths,
kFSEventStreamEventIdSinceNow,
latency,
flags);
assert(ref != NULL);
state = loop->cf_state;
pFSEventStreamScheduleWithRunLoop(ref,
state->loop,
*pkCFRunLoopDefaultMode);
if (!pFSEventStreamStart(ref)) {
pFSEventStreamInvalidate(ref);
pFSEventStreamRelease(ref);
return UV_EMFILE;
}
state->fsevent_stream = ref;
return 0;
}
/* Runs in CF thread */
static void uv__fsevents_destroy_stream(uv_loop_t* loop) {
uv__cf_loop_state_t* state;
state = loop->cf_state;
if (state->fsevent_stream == NULL)
return;
/* Stop emitting events */
pFSEventStreamStop(state->fsevent_stream);
/* Release stream */
pFSEventStreamInvalidate(state->fsevent_stream);
pFSEventStreamRelease(state->fsevent_stream);
state->fsevent_stream = NULL;
}
/* Runs in CF thread, when there're new fsevent handles to add to stream */
static void uv__fsevents_reschedule(uv_fs_event_t* handle,
uv__cf_loop_signal_type_t type) {
uv__cf_loop_state_t* state;
QUEUE* q;
uv_fs_event_t* curr;
CFArrayRef cf_paths;
CFStringRef* paths;
unsigned int i;
int err;
unsigned int path_count;
state = handle->loop->cf_state;
paths = NULL;
cf_paths = NULL;
err = 0;
/* NOTE: `i` is used in deallocation loop below */
i = 0;
/* Optimization to prevent O(n^2) time spent when starting to watch
* many files simultaneously
*/
uv_mutex_lock(&state->fsevent_mutex);
if (state->fsevent_need_reschedule == 0) {
uv_mutex_unlock(&state->fsevent_mutex);
goto final;
}
state->fsevent_need_reschedule = 0;
uv_mutex_unlock(&state->fsevent_mutex);
/* Destroy previous FSEventStream */
uv__fsevents_destroy_stream(handle->loop);
/* Any failure below will be a memory failure */
err = UV_ENOMEM;
/* Create list of all watched paths */
uv_mutex_lock(&state->fsevent_mutex);
path_count = state->fsevent_handle_count;
if (path_count != 0) {
paths = uv__malloc(sizeof(*paths) * path_count);
if (paths == NULL) {
uv_mutex_unlock(&state->fsevent_mutex);
goto final;
}
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;
/* Synchronize threads */
uv_sem_wait(&loop->cf_sem);
return 0;
fail_thread_create:
loop->cf_state = NULL;
fail_signal_source_create:
uv_mutex_destroy(&state->fsevent_mutex);
fail_fsevent_mutex_init:
uv_sem_destroy(&state->fsevent_sem);
fail_fsevent_sem_init:
uv_sem_destroy(&loop->cf_sem);
fail_sem_init:
uv_mutex_destroy(&loop->cf_mutex);
fail_mutex_init:
uv__free(state);
return err;
}
/* Runs in UV loop */
void uv__fsevents_loop_delete(uv_loop_t* loop) {
uv__cf_loop_signal_t* s;
uv__cf_loop_state_t* state;
QUEUE* q;
if (loop->cf_state == NULL)
return;
if (uv__cf_loop_signal(loop, NULL, kUVCFLoopSignalRegular) != 0)
abort();
uv_thread_join(&loop->cf_thread);
uv_sem_destroy(&loop->cf_sem);
uv_mutex_destroy(&loop->cf_mutex);
/* Free any remaining data */
while (!QUEUE_EMPTY(&loop->cf_signals)) {
q = QUEUE_HEAD(&loop->cf_signals);
s = QUEUE_DATA(q, uv__cf_loop_signal_t, member);
QUEUE_REMOVE(q);
uv__free(s);
}
/* Destroy state */
state = loop->cf_state;
uv_sem_destroy(&state->fsevent_sem);
uv_mutex_destroy(&state->fsevent_mutex);
pCFRelease(state->signal_source);
uv__free(state);
loop->cf_state = NULL;
}
/* Runs in CF thread. This is the CF loop's body */
static void* uv__cf_loop_runner(void* arg) {
uv_loop_t* loop;
uv__cf_loop_state_t* state;
loop = arg;
state = loop->cf_state;
state->loop = pCFRunLoopGetCurrent();
pCFRunLoopAddSource(state->loop,
state->signal_source,
*pkCFRunLoopDefaultMode);
uv_sem_post(&loop->cf_sem);
pCFRunLoopRun();
pCFRunLoopRemoveSource(state->loop,
state->signal_source,
*pkCFRunLoopDefaultMode);
state->loop = NULL;
return NULL;
}
/* Runs in CF thread, executed after `uv__cf_loop_signal()` */
static void uv__cf_loop_cb(void* arg) {
uv_loop_t* loop;
uv__cf_loop_state_t* state;
QUEUE* item;
QUEUE split_head;
uv__cf_loop_signal_t* s;
loop = arg;
state = loop->cf_state;
uv_mutex_lock(&loop->cf_mutex);
QUEUE_MOVE(&loop->cf_signals, &split_head);
uv_mutex_unlock(&loop->cf_mutex);
while (!QUEUE_EMPTY(&split_head)) {
item = QUEUE_HEAD(&split_head);
QUEUE_REMOVE(item);
s = QUEUE_DATA(item, uv__cf_loop_signal_t, member);
/* This was a termination signal */
if (s->handle == NULL)
pCFRunLoopStop(state->loop);
else
uv__fsevents_reschedule(s->handle, s->type);
uv__free(s);
}
}
/* Runs in UV loop to notify CF thread */
int uv__cf_loop_signal(uv_loop_t* loop,
uv_fs_event_t* handle,
uv__cf_loop_signal_type_t type) {
uv__cf_loop_signal_t* item;
uv__cf_loop_state_t* state;
item = uv__malloc(sizeof(*item));
if (item == NULL)
return UV_ENOMEM;
item->handle = handle;
item->type = type;
uv_mutex_lock(&loop->cf_mutex);
QUEUE_INSERT_TAIL(&loop->cf_signals, &item->member);
state = loop->cf_state;
assert(state != NULL);
pCFRunLoopSourceSignal(state->signal_source);
pCFRunLoopWakeUp(state->loop);
uv_mutex_unlock(&loop->cf_mutex);
return 0;
}
/* Runs in UV loop to initialize handle */
int uv__fsevents_init(uv_fs_event_t* handle) {
int err;
uv__cf_loop_state_t* state;
err = uv__fsevents_loop_init(handle->loop);
if (err)
return err;
/* Get absolute path to file */
handle->realpath = realpath(handle->path, NULL);
if (handle->realpath == NULL)
return UV__ERR(errno);
handle->realpath_len = strlen(handle->realpath);
/* Initialize event queue */
QUEUE_INIT(&handle->cf_events);
handle->cf_error = 0;
/*
* Events will occur in other thread.
* Initialize callback for getting them back into event loop's thread
*/
handle->cf_cb = uv__malloc(sizeof(*handle->cf_cb));
if (handle->cf_cb == NULL) {
err = UV_ENOMEM;
goto fail_cf_cb_malloc;
}
handle->cf_cb->data = handle;
uv_async_init(handle->loop, handle->cf_cb, uv__fsevents_cb);
handle->cf_cb->flags |= UV_HANDLE_INTERNAL;
uv_unref((uv_handle_t*) handle->cf_cb);
err = uv_mutex_init(&handle->cf_mutex);
if (err)
goto fail_cf_mutex_init;
/* Insert handle into the list */
state = handle->loop->cf_state;
uv_mutex_lock(&state->fsevent_mutex);
QUEUE_INSERT_TAIL(&state->fsevent_handles, &handle->cf_member);
state->fsevent_handle_count++;
state->fsevent_need_reschedule = 1;
uv_mutex_unlock(&state->fsevent_mutex);
/* Reschedule FSEventStream */
assert(handle != NULL);
err = uv__cf_loop_signal(handle->loop, handle, kUVCFLoopSignalRegular);
if (err)
goto fail_loop_signal;
return 0;
fail_loop_signal:
uv_mutex_destroy(&handle->cf_mutex);
fail_cf_mutex_init:
uv__free(handle->cf_cb);
handle->cf_cb = NULL;
fail_cf_cb_malloc:
uv__free(handle->realpath);
handle->realpath = NULL;
handle->realpath_len = 0;
return err;
}
/* Runs in UV loop to de-initialize handle */
int uv__fsevents_close(uv_fs_event_t* handle) {
int err;
uv__cf_loop_state_t* state;
if (handle->cf_cb == NULL)
return UV_EINVAL;
/* Remove handle from the list */
state = handle->loop->cf_state;
uv_mutex_lock(&state->fsevent_mutex);
QUEUE_REMOVE(&handle->cf_member);
state->fsevent_handle_count--;
state->fsevent_need_reschedule = 1;
uv_mutex_unlock(&state->fsevent_mutex);
/* Reschedule FSEventStream */
assert(handle != NULL);
err = uv__cf_loop_signal(handle->loop, handle, kUVCFLoopSignalClosing);
if (err)
return UV__ERR(err);
/* Wait for deinitialization */
uv_sem_wait(&state->fsevent_sem);
uv_close((uv_handle_t*) handle->cf_cb, (uv_close_cb) uv__free);
handle->cf_cb = NULL;
/* Free data in queue */
UV__FSEVENTS_PROCESS(handle, {
/* NOP */
});
uv_mutex_destroy(&handle->cf_mutex);
uv__free(handle->realpath);
handle->realpath = NULL;
handle->realpath_len = 0;
return 0;
}
#endif /* TARGET_OS_IPHONE */