mirror of
https://github.com/google/santa.git
synced 2026-01-20 03:28:10 -05:00
102 lines
3.1 KiB
Objective-C
102 lines
3.1 KiB
Objective-C
/// Copyright 2015 Google Inc. All rights reserved.
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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#import "SNTFileWatcher.h"
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@interface SNTFileWatcher ()
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@property NSString *filePath;
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@property dispatch_source_t monitoringSource;
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@property(strong) void (^eventHandler)(void);
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@property(strong) void (^internalEventHandler)(void);
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@property(strong) void (^internalCancelHandler)(void);
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@end
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@implementation SNTFileWatcher
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- (instancetype)init {
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[self doesNotRecognizeSelector:_cmd];
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return nil;
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}
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- (instancetype)initWithFilePath:(NSString *)filePath handler:(void (^)(void))handler {
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self = [super init];
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if (self) {
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_filePath = filePath;
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_eventHandler = handler;
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if (!_filePath || !_eventHandler) return nil;
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[self beginWatchingFile];
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}
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return self;
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}
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- (void)dealloc {
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[self stopWatchingFile];
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}
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- (void)beginWatchingFile {
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__weak __typeof(self) weakSelf = self;
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int mask = (DISPATCH_VNODE_DELETE | DISPATCH_VNODE_WRITE |
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DISPATCH_VNODE_EXTEND | DISPATCH_VNODE_RENAME);
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dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0);
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self.internalEventHandler = ^{
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unsigned long l = dispatch_source_get_data(weakSelf.monitoringSource);
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if (l & DISPATCH_VNODE_DELETE || l & DISPATCH_VNODE_RENAME) {
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if (weakSelf.monitoringSource) dispatch_source_cancel(weakSelf.monitoringSource);
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} else {
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weakSelf.eventHandler();
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}
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};
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self.internalCancelHandler = ^{
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int fd;
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if (weakSelf.monitoringSource) {
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fd = (int)dispatch_source_get_handle(weakSelf.monitoringSource);
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close(fd);
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}
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const char *filePathCString = [weakSelf.filePath fileSystemRepresentation];
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while ((fd = open(filePathCString, O_EVTONLY)) < 0) {
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usleep(1000);
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}
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weakSelf.monitoringSource =
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dispatch_source_create(DISPATCH_SOURCE_TYPE_VNODE, fd, mask, queue);
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dispatch_source_set_event_handler(weakSelf.monitoringSource, weakSelf.internalEventHandler);
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dispatch_source_set_cancel_handler(weakSelf.monitoringSource, weakSelf.internalCancelHandler);
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dispatch_resume(weakSelf.monitoringSource);
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weakSelf.eventHandler();
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};
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dispatch_async(queue, self.internalCancelHandler);
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}
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- (void)stopWatchingFile {
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if (!self.monitoringSource) return;
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int fd = (int)dispatch_source_get_handle(self.monitoringSource);
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dispatch_source_set_event_handler_f(self.monitoringSource, NULL);
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dispatch_source_set_cancel_handler(self.monitoringSource, ^{ close(fd); });
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dispatch_source_cancel(self.monitoringSource);
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self.monitoringSource = nil;
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}
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@end
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