file_path_watcher_linux.cc revision ca12bfac764ba476d6cd062bf1dde12cc64c3f40
15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/files/file_path_watcher.h" 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <errno.h> 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <string.h> 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <sys/inotify.h> 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <sys/ioctl.h> 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <sys/select.h> 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <unistd.h> 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <algorithm> 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <set> 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <utility> 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <vector> 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/bind.h" 207d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)#include "base/containers/hash_tables.h" 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/file_util.h" 222a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#include "base/files/file_path.h" 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/lazy_instance.h" 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/location.h" 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/logging.h" 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/memory/scoped_ptr.h" 27ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch#include "base/message_loop/message_loop.h" 28868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)#include "base/message_loop/message_loop_proxy.h" 292a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#include "base/posix/eintr_wrapper.h" 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/synchronization/lock.h" 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/threading/thread.h" 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace base { 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace { 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class FilePathWatcherImpl; 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Singleton to manage all inotify watches. 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// TODO(tony): It would be nice if this wasn't a singleton. 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// http://crbug.com/38174 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class InotifyReader { 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public: 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) typedef int Watch; // Watch descriptor used by AddWatch and RemoveWatch. 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) static const Watch kInvalidWatch = -1; 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Watch directory |path| for changes. |watcher| will be notified on each 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // change. Returns kInvalidWatch on failure. 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Watch AddWatch(const FilePath& path, FilePathWatcherImpl* watcher); 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Remove |watch|. Returns true on success. 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool RemoveWatch(Watch watch, FilePathWatcherImpl* watcher); 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Callback for InotifyReaderTask. 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) void OnInotifyEvent(const inotify_event* event); 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) private: 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) friend struct ::base::DefaultLazyInstanceTraits<InotifyReader>; 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) typedef std::set<FilePathWatcherImpl*> WatcherSet; 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) InotifyReader(); 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ~InotifyReader(); 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // We keep track of which delegates want to be notified on which watches. 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::hash_map<Watch, WatcherSet> watchers_; 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Lock to protect watchers_. 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::Lock lock_; 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Separate thread on which we run blocking read for inotify events. 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::Thread thread_; 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // File descriptor returned by inotify_init. 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int inotify_fd_; 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Use self-pipe trick to unblock select during shutdown. 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int shutdown_pipe_[2]; 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Flag set to true when startup was successful. 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool valid_; 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DISALLOW_COPY_AND_ASSIGN(InotifyReader); 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class FilePathWatcherImpl : public FilePathWatcher::PlatformDelegate, 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public MessageLoop::DestructionObserver { 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public: 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) FilePathWatcherImpl(); 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Called for each event coming from the watch. |fired_watch| identifies the 925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // watch that fired, |child| indicates what has changed, and is relative to 935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // the currently watched path for |fired_watch|. The flag |created| is true if 945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // the object appears. 955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) void OnFilePathChanged(InotifyReader::Watch fired_watch, 965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const FilePath::StringType& child, 975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool created); 985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Start watching |path| for changes and notify |delegate| on each change. 1005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Returns true if watch for |path| has been added successfully. 1015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual bool Watch(const FilePath& path, 1022a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) bool recursive, 1032a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const FilePathWatcher::Callback& callback) OVERRIDE; 1045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Cancel the watch. This unregisters the instance with InotifyReader. 1065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual void Cancel() OVERRIDE; 1075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Deletion of the FilePathWatcher will call Cancel() to dispose of this 1095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // object in the right thread. This also observes destruction of the required 1105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // cleanup thread, in case it quits before Cancel() is called. 1115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual void WillDestroyCurrentMessageLoop() OVERRIDE; 1125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) protected: 1145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual ~FilePathWatcherImpl() {} 1155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) private: 1175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Cleans up and stops observing the |message_loop_| thread. 1185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual void CancelOnMessageLoopThread() OVERRIDE; 1195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Inotify watches are installed for all directory components of |target_|. A 1215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // WatchEntry instance holds the watch descriptor for a component and the 1225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // subdirectory for that identifies the next component. If a symbolic link 1235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // is being watched, the target of the link is also kept. 1245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) struct WatchEntry { 1255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) WatchEntry(InotifyReader::Watch watch, const FilePath::StringType& subdir) 1265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : watch_(watch), 1275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) subdir_(subdir) {} 1285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) InotifyReader::Watch watch_; 1305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) FilePath::StringType subdir_; 1315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) FilePath::StringType linkname_; 1325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) }; 1335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) typedef std::vector<WatchEntry> WatchVector; 1345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Reconfigure to watch for the most specific parent directory of |target_| 1365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // that exists. Updates |watched_path_|. Returns true on success. 1375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool UpdateWatches() WARN_UNUSED_RESULT; 1385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1392a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Callback to notify upon changes. 1402a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) FilePathWatcher::Callback callback_; 1415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // The file or directory we're supposed to watch. 1435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) FilePath target_; 1445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // The vector of watches and next component names for all path components, 1465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // starting at the root directory. The last entry corresponds to the watch for 1475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // |target_| and always stores an empty next component name in |subdir_|. 1485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) WatchVector watches_; 1495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DISALLOW_COPY_AND_ASSIGN(FilePathWatcherImpl); 1515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 1525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void InotifyReaderCallback(InotifyReader* reader, int inotify_fd, 1545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int shutdown_fd) { 1555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Make sure the file descriptors are good for use with select(). 1565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CHECK_LE(0, inotify_fd); 1575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CHECK_GT(FD_SETSIZE, inotify_fd); 1585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CHECK_LE(0, shutdown_fd); 1595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CHECK_GT(FD_SETSIZE, shutdown_fd); 1605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (true) { 1625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) fd_set rfds; 1635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) FD_ZERO(&rfds); 1645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) FD_SET(inotify_fd, &rfds); 1655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) FD_SET(shutdown_fd, &rfds); 1665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Wait until some inotify events are available. 1685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int select_result = 1695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HANDLE_EINTR(select(std::max(inotify_fd, shutdown_fd) + 1, 1705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &rfds, NULL, NULL, NULL)); 1715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (select_result < 0) { 1725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DPLOG(WARNING) << "select failed"; 1735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 1745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (FD_ISSET(shutdown_fd, &rfds)) 1775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 1785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Adjust buffer size to current event queue size. 1805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int buffer_size; 1815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int ioctl_result = HANDLE_EINTR(ioctl(inotify_fd, FIONREAD, 1825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &buffer_size)); 1835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (ioctl_result != 0) { 1855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DPLOG(WARNING) << "ioctl failed"; 1865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 1875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::vector<char> buffer(buffer_size); 1905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ssize_t bytes_read = HANDLE_EINTR(read(inotify_fd, &buffer[0], 1925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buffer_size)); 1935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (bytes_read < 0) { 1955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DPLOG(WARNING) << "read from inotify fd failed"; 1965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 1975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ssize_t i = 0; 2005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) while (i < bytes_read) { 2015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) inotify_event* event = reinterpret_cast<inotify_event*>(&buffer[i]); 2025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t event_size = sizeof(inotify_event) + event->len; 2035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(i + event_size <= static_cast<size_t>(bytes_read)); 2045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reader->OnInotifyEvent(event); 2055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) i += event_size; 2065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static base::LazyInstance<InotifyReader>::Leaky g_inotify_reader = 2115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) LAZY_INSTANCE_INITIALIZER; 2125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)InotifyReader::InotifyReader() 2145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : thread_("inotify_reader"), 2155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) inotify_fd_(inotify_init()), 2165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) valid_(false) { 2175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) shutdown_pipe_[0] = -1; 2185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) shutdown_pipe_[1] = -1; 2195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (inotify_fd_ >= 0 && pipe(shutdown_pipe_) == 0 && thread_.Start()) { 2205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) thread_.message_loop()->PostTask( 2215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) FROM_HERE, base::Bind(&InotifyReaderCallback, this, inotify_fd_, 2225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) shutdown_pipe_[0])); 2235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) valid_ = true; 2245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)InotifyReader::~InotifyReader() { 2285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (valid_) { 2295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Write to the self-pipe so that the select call in InotifyReaderTask 2305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // returns. 2315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ssize_t ret = HANDLE_EINTR(write(shutdown_pipe_[1], "", 1)); 2325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DPCHECK(ret > 0); 2335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK_EQ(ret, 1); 2345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) thread_.Stop(); 2355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (inotify_fd_ >= 0) 2375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) close(inotify_fd_); 2385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (shutdown_pipe_[0] >= 0) 2395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) close(shutdown_pipe_[0]); 2405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (shutdown_pipe_[1] >= 0) 2415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) close(shutdown_pipe_[1]); 2425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)InotifyReader::Watch InotifyReader::AddWatch( 2455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const FilePath& path, FilePathWatcherImpl* watcher) { 2465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!valid_) 2475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return kInvalidWatch; 2485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::AutoLock auto_lock(lock_); 2505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Watch watch = inotify_add_watch(inotify_fd_, path.value().c_str(), 2525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) IN_CREATE | IN_DELETE | 2535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) IN_CLOSE_WRITE | IN_MOVE | 2545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) IN_ONLYDIR); 2555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (watch == kInvalidWatch) 2575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return kInvalidWatch; 2585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) watchers_[watch].insert(watcher); 2605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return watch; 2625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool InotifyReader::RemoveWatch(Watch watch, 2655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) FilePathWatcherImpl* watcher) { 2665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!valid_) 2675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 2685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::AutoLock auto_lock(lock_); 2705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) watchers_[watch].erase(watcher); 2725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (watchers_[watch].empty()) { 2745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) watchers_.erase(watch); 2755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return (inotify_rm_watch(inotify_fd_, watch) == 0); 2765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 2795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void InotifyReader::OnInotifyEvent(const inotify_event* event) { 2825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (event->mask & IN_IGNORED) 2835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 2845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) FilePath::StringType child(event->len ? event->name : FILE_PATH_LITERAL("")); 2865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::AutoLock auto_lock(lock_); 2875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (WatcherSet::iterator watcher = watchers_[event->wd].begin(); 2895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) watcher != watchers_[event->wd].end(); 2905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ++watcher) { 2915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (*watcher)->OnFilePathChanged(event->wd, 2925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) child, 2935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) event->mask & (IN_CREATE | IN_MOVED_TO)); 2945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2972a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)FilePathWatcherImpl::FilePathWatcherImpl() { 2985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void FilePathWatcherImpl::OnFilePathChanged(InotifyReader::Watch fired_watch, 3015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const FilePath::StringType& child, 3025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool created) { 3035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!message_loop()->BelongsToCurrentThread()) { 3045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Switch to message_loop_ to access watches_ safely. 3055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) message_loop()->PostTask(FROM_HERE, 3065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::Bind(&FilePathWatcherImpl::OnFilePathChanged, 3075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) this, 3085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) fired_watch, 3095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) child, 3105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) created)); 3115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 3125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(MessageLoopForIO::current()); 3155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Find the entry in |watches_| that corresponds to |fired_watch|. 3175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) WatchVector::const_iterator watch_entry(watches_.begin()); 3185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for ( ; watch_entry != watches_.end(); ++watch_entry) { 3195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (fired_watch == watch_entry->watch_) { 3205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Check whether a path component of |target_| changed. 3215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool change_on_target_path = child.empty() || 3225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ((child == watch_entry->subdir_) && watch_entry->linkname_.empty()) || 3235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (child == watch_entry->linkname_); 3245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Check whether the change references |target_| or a direct child. 3265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(watch_entry->subdir_.empty() || 3275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (watch_entry + 1) != watches_.end()); 3285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool target_changed = 3295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (watch_entry->subdir_.empty() && (child == watch_entry->linkname_)) || 3305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (watch_entry->subdir_.empty() && watch_entry->linkname_.empty()) || 3315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (watch_entry->subdir_ == child && (watch_entry + 1)->subdir_.empty()); 3325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Update watches if a directory component of the |target_| path 3345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // (dis)appears. Note that we don't add the additional restriction 3355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // of checking the event mask to see if it is for a directory here 3365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // as changes to symlinks on the target path will not have 3375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // IN_ISDIR set in the event masks. As a result we may sometimes 3385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // call UpdateWatches() unnecessarily. 3395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (change_on_target_path && !UpdateWatches()) { 3402a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) callback_.Run(target_, true /* error */); 3415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 3425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Report the following events: 3455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // - The target or a direct child of the target got changed (in case the 3465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // watched path refers to a directory). 3475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // - One of the parent directories got moved or deleted, since the target 3485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // disappears in this case. 3495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // - One of the parent directories appears. The event corresponding to 3505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // the target appearing might have been missed in this case, so 3515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // recheck. 3525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (target_changed || 3535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (change_on_target_path && !created) || 3547dbb3d5cf0c15f500944d211057644d6a2f37371Ben Murdoch (change_on_target_path && PathExists(target_))) { 3552a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) callback_.Run(target_, false); 3565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 3575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool FilePathWatcherImpl::Watch(const FilePath& path, 3632a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) bool recursive, 3642a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const FilePathWatcher::Callback& callback) { 3655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(target_.empty()); 3665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(MessageLoopForIO::current()); 3672a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (recursive) { 3682a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Recursive watch is not supported on this platform. 3692a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) NOTIMPLEMENTED(); 3702a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) return false; 3712a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 3725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3737d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) set_message_loop(base::MessageLoopProxy::current().get()); 3742a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) callback_ = callback; 3755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) target_ = path; 3765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) MessageLoop::current()->AddDestructionObserver(this); 3775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::vector<FilePath::StringType> comps; 3795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) target_.GetComponents(&comps); 3805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(!comps.empty()); 3815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::vector<FilePath::StringType>::const_iterator comp = comps.begin(); 3825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (++comp; comp != comps.end(); ++comp) 3835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) watches_.push_back(WatchEntry(InotifyReader::kInvalidWatch, *comp)); 3845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) watches_.push_back(WatchEntry(InotifyReader::kInvalidWatch, 3865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) FilePath::StringType())); 3875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return UpdateWatches(); 3885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void FilePathWatcherImpl::Cancel() { 3912a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (callback_.is_null()) { 3925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Watch was never called, or the |message_loop_| thread is already gone. 3935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) set_cancelled(); 3945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 3955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Switch to the message_loop_ if necessary so we can access |watches_|. 3985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!message_loop()->BelongsToCurrentThread()) { 3995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) message_loop()->PostTask(FROM_HERE, 4005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::Bind(&FilePathWatcher::CancelWatch, 4015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) make_scoped_refptr(this))); 4025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 4035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CancelOnMessageLoopThread(); 4045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void FilePathWatcherImpl::CancelOnMessageLoopThread() { 4085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!is_cancelled()) 4095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) set_cancelled(); 4105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4112a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (!callback_.is_null()) { 4125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) MessageLoop::current()->RemoveDestructionObserver(this); 4132a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) callback_.Reset(); 4145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (WatchVector::iterator watch_entry(watches_.begin()); 4175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) watch_entry != watches_.end(); ++watch_entry) { 4185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (watch_entry->watch_ != InotifyReader::kInvalidWatch) 4195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) g_inotify_reader.Get().RemoveWatch(watch_entry->watch_, this); 4205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) watches_.clear(); 4225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) target_.clear(); 4235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void FilePathWatcherImpl::WillDestroyCurrentMessageLoop() { 4265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CancelOnMessageLoopThread(); 4275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool FilePathWatcherImpl::UpdateWatches() { 4305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Ensure this runs on the |message_loop_| exclusively in order to avoid 4315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // concurrency issues. 4325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(message_loop()->BelongsToCurrentThread()); 4335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Walk the list of watches and update them as we go. 4355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) FilePath path(FILE_PATH_LITERAL("/")); 4365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool path_valid = true; 4375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (WatchVector::iterator watch_entry(watches_.begin()); 4385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) watch_entry != watches_.end(); ++watch_entry) { 4395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) InotifyReader::Watch old_watch = watch_entry->watch_; 4405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (path_valid) { 4415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) watch_entry->watch_ = g_inotify_reader.Get().AddWatch(path, this); 4425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if ((watch_entry->watch_ == InotifyReader::kInvalidWatch) && 4435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) file_util::IsLink(path)) { 4445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) FilePath link; 4455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (file_util::ReadSymbolicLink(path, &link)) { 4465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!link.IsAbsolute()) 4475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) link = path.DirName().Append(link); 4485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Try watching symlink target directory. If the link target is "/", 4495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // then we shouldn't get here in normal situations and if we do, we'd 4505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // watch "/" for changes to a component "/" which is harmless so no 4515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // special treatment of this case is required. 4525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) watch_entry->watch_ = 4535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) g_inotify_reader.Get().AddWatch(link.DirName(), this); 4545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (watch_entry->watch_ != InotifyReader::kInvalidWatch) { 4555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) watch_entry->linkname_ = link.BaseName().value(); 4565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 4575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DPLOG(WARNING) << "Watch failed for " << link.DirName().value(); 4585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // TODO(craig) Symlinks only work if the parent directory 4595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // for the target exist. Ideally we should make sure we've 4605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // watched all the components of the symlink path for 4615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // changes. See crbug.com/91561 for details. 4625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (watch_entry->watch_ == InotifyReader::kInvalidWatch) { 4665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) path_valid = false; 4675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 4695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) watch_entry->watch_ = InotifyReader::kInvalidWatch; 4705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (old_watch != InotifyReader::kInvalidWatch && 4725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) old_watch != watch_entry->watch_) { 4735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) g_inotify_reader.Get().RemoveWatch(old_watch, this); 4745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) path = path.Append(watch_entry->subdir_); 4765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 4795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace 4825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)FilePathWatcher::FilePathWatcher() { 4845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) impl_ = new FilePathWatcherImpl(); 4855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace base 488