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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "net/dns/notify_watcher_mac.h" | |
| 6 | |
| 7 #include <notify.h> | |
| 8 | |
| 9 #include "base/logging.h" | |
| 10 #include "base/posix/eintr_wrapper.h" | |
| 11 | |
| 12 namespace net { | |
| 13 | |
| 14 NotifyWatcherMac::NotifyWatcherMac() : notify_fd_(-1), notify_token_(-1) {} | |
| 15 | |
| 16 NotifyWatcherMac::~NotifyWatcherMac() { | |
| 17 Cancel(); | |
| 18 } | |
| 19 | |
| 20 bool NotifyWatcherMac::Watch(const char* key, const CallbackType& callback) { | |
| 21 DCHECK(key); | |
| 22 DCHECK(!callback.is_null()); | |
| 23 Cancel(); | |
| 24 uint32_t status = notify_register_file_descriptor( | |
| 25 key, ¬ify_fd_, 0, ¬ify_token_); | |
| 26 if (status != NOTIFY_STATUS_OK) | |
| 27 return false; | |
| 28 DCHECK_GE(notify_fd_, 0); | |
| 29 if (!base::MessageLoopForIO::current()->WatchFileDescriptor( | |
| 30 notify_fd_, | |
| 31 true, | |
| 32 base::MessageLoopForIO::WATCH_READ, | |
| 33 &watcher_, | |
| 34 this)) { | |
| 35 Cancel(); | |
| 36 return false; | |
| 37 } | |
| 38 callback_ = callback; | |
| 39 return true; | |
| 40 } | |
| 41 | |
| 42 void NotifyWatcherMac::Cancel() { | |
| 43 if (notify_fd_ >= 0) { | |
| 44 notify_cancel(notify_token_); // Also closes |notify_fd_|. | |
| 45 notify_fd_ = -1; | |
| 46 callback_.Reset(); | |
| 47 watcher_.StopWatchingFileDescriptor(); | |
| 48 } | |
| 49 } | |
| 50 | |
| 51 void NotifyWatcherMac::OnFileCanReadWithoutBlocking(int fd) { | |
| 52 int token; | |
| 53 int status = HANDLE_EINTR(read(notify_fd_, &token, sizeof(token))); | |
| 54 if (status != sizeof(token)) { | |
| 55 Cancel(); | |
| 56 callback_.Run(false); | |
| 57 return; | |
| 58 } | |
| 59 // Ignoring |token| value to avoid possible endianness mismatch: | |
| 60 // http://openradar.appspot.com/8821081 | |
| 61 callback_.Run(true); | |
| 62 } | |
| 63 | |
| 64 } // namespace net | |
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