src/unix/fswatcher_inotify.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/unix/fswatcher_inotify.cpp
   3 // Purpose:     inotify-based wxFileSystemWatcher implementation
   4 // Author:      Bartosz Bekier
   5 // Created:     2009-05-26
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2009 Bartosz Bekier <bartosz.bekier@gmail.com>
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 // For compilers that support precompilation, includes "wx.h".
  12 #include "wx/wxprec.h"
  13
  14 #ifdef __BORLANDC__
  15     #pragma hdrstop
  16 #endif
  17
  18 #if wxUSE_FSWATCHER
  19
  20 #include "wx/fswatcher.h"
  21
  22 #ifdef wxHAS_INOTIFY
  23
  24 #include <sys/inotify.h>
  25 #include <unistd.h>
  26 #include "wx/private/fswatcher.h"
  27
  28 // ============================================================================
  29 // wxFSWatcherImpl implementation & helper wxFSWSourceHandler implementation
  30 // ============================================================================
  31
  32 // inotify watch descriptor => wxFSWatchEntry* map
  33 WX_DECLARE_HASH_MAP(int, wxFSWatchEntry*, wxIntegerHash, wxIntegerEqual,
  34                                               wxFSWatchEntryDescriptors);
  35
  36 // inotify event cookie => inotify_event* map
  37 WX_DECLARE_HASH_MAP(int, inotify_event*, wxIntegerHash, wxIntegerEqual,
  38                                                       wxInotifyCookies);
  39
  40 /**
  41  * Helper class encapsulating inotify mechanism
  42  */
  43 class wxFSWatcherImplUnix : public wxFSWatcherImpl
  44 {
  45 public:
  46     wxFSWatcherImplUnix(wxFileSystemWatcherBase* watcher) :
  47         wxFSWatcherImpl(watcher),
  48         m_source(NULL),
  49         m_ifd(-1)
  50     {
  51         m_handler = new wxFSWSourceHandler(this);
  52     }
  53
  54     ~wxFSWatcherImplUnix()
  55     {
  56         // we close inotify only if initialized before
  57         if (IsOk())
  58         {
  59             Close();
  60         }
  61
  62         delete m_handler;
  63     }
  64
  65     bool Init()
  66     {
  67         wxCHECK_MSG( !IsOk(), false, "Inotify already initialized" );
  68
  69         wxEventLoopBase *loop = wxEventLoopBase::GetActive();
  70         wxCHECK_MSG( loop, false, "File system watcher needs an event loop" );
  71
  72         m_ifd = inotify_init();
  73         if ( m_ifd == -1 )
  74         {
  75             wxLogSysError( _("Unable to create inotify instance") );
  76             return false;
  77         }
  78
  79         m_source = loop->AddSourceForFD
  80                          (
  81                           m_ifd,
  82                           m_handler,
  83                           wxEVENT_SOURCE_INPUT | wxEVENT_SOURCE_EXCEPTION
  84                          );
  85
  86         return m_source != NULL;
  87     }
  88
  89     void Close()
  90     {
  91         wxCHECK_RET( IsOk(),
  92                     "Inotify not initialized or invalid inotify descriptor" );
  93
  94         wxDELETE(m_source);
  95
  96         if ( close(m_ifd) != 0 )
  97         {
  98             wxLogSysError( _("Unable to close inotify instance") );
  99         }
 100     }
 101
 102     virtual bool DoAdd(wxSharedPtr<wxFSWatchEntryUnix> watch)
 103     {
 104         wxCHECK_MSG( IsOk(), false,
 105                     "Inotify not initialized or invalid inotify descriptor" );
 106
 107         int wd = DoAddInotify(watch.get());
 108         if (wd == -1)
 109         {
 110             wxLogSysError( _("Unable to add inotify watch") );
 111             return false;
 112         }
 113
 114         wxFSWatchEntryDescriptors::value_type val(wd, watch.get());
 115         if (!m_watchMap.insert(val).second)
 116         {
 117             wxFAIL_MSG( wxString::Format( "Path %s is already watched",
 118                                            watch->GetPath()) );
 119             return false;
 120         }
 121
 122         return true;
 123     }
 124
 125     virtual bool DoRemove(wxSharedPtr<wxFSWatchEntryUnix> watch)
 126     {
 127         wxCHECK_MSG( IsOk(), false,
 128                     "Inotify not initialized or invalid inotify descriptor" );
 129
 130         int ret = DoRemoveInotify(watch.get());
 131         if (ret == -1)
 132         {
 133             wxLogSysError( _("Unable to remove inotify watch") );
 134             return false;
 135         }
 136
 137         if (m_watchMap.erase(watch->GetWatchDescriptor()) != 1)
 138         {
 139             wxFAIL_MSG( wxString::Format("Path %s is not watched",
 140                                           watch->GetPath()) );
 141         }
 142         // Cache the wd in case any events arrive late
 143         m_staleDescriptors.Add(watch->GetWatchDescriptor());
 144
 145         watch->SetWatchDescriptor(-1);
 146         return true;
 147     }
 148
 149     virtual bool RemoveAll()
 150     {
 151         wxFSWatchEntries::iterator it = m_watches.begin();
 152         for ( ; it != m_watches.end(); ++it )
 153         {
 154             (void) DoRemove(it->second);
 155         }
 156         m_watches.clear();
 157         return true;
 158     }
 159
 160     int ReadEvents()
 161     {
 162         wxCHECK_MSG( IsOk(), -1,
 163                     "Inotify not initialized or invalid inotify descriptor" );
 164
 165         // read events
 166         // TODO differentiate depending on params
 167         char buf[128 * sizeof(inotify_event)];
 168         int left = ReadEventsToBuf(buf, sizeof(buf));
 169         if (left == -1)
 170             return -1;
 171
 172         // left > 0, we have events
 173         char* memory = buf;
 174         int event_count = 0;
 175         while (left > 0) // OPT checking 'memory' would suffice
 176         {
 177             event_count++;
 178             inotify_event* e = (inotify_event*)memory;
 179
 180             // process one inotify_event
 181             ProcessNativeEvent(*e);
 182
 183             int offset = sizeof(inotify_event) + e->len;
 184             left -= offset;
 185             memory += offset;
 186         }
 187
 188         // take care of unmatched renames
 189         ProcessRenames();
 190
 191         wxLogTrace(wxTRACE_FSWATCHER, "We had %d native events", event_count);
 192         return event_count;
 193     }
 194
 195     bool IsOk() const
 196     {
 197         return m_source != NULL;
 198     }
 199
 200 protected:
 201     int DoAddInotify(wxFSWatchEntry* watch)
 202     {
 203         int flags = Watcher2NativeFlags(watch->GetFlags());
 204         int wd = inotify_add_watch(m_ifd, watch->GetPath().fn_str(), flags);
 205         // finally we can set watch descriptor
 206         watch->SetWatchDescriptor(wd);
 207         return wd;
 208     }
 209
 210     int DoRemoveInotify(wxFSWatchEntry* watch)
 211     {
 212         return inotify_rm_watch(m_ifd, watch->GetWatchDescriptor());
 213     }
 214
 215     void ProcessNativeEvent(const inotify_event& inevt)
 216     {
 217         wxLogTrace(wxTRACE_FSWATCHER, InotifyEventToString(inevt));
 218
 219         // after removing inotify watch we get IN_IGNORED for it, but the watch
 220         // will be already removed from our list at that time
 221         if (inevt.mask & IN_IGNORED)
 222         {
 223             // It is now safe to remove it from the stale descriptors too, we
 224             // won't get any more events for it.
 225             // However if we're here because a dir that we're still watching
 226             // has just been deleted, its wd won't be on this list
 227             const int pos = m_staleDescriptors.Index(inevt.wd);
 228             if ( pos != wxNOT_FOUND )
 229             {
 230                 m_staleDescriptors.RemoveAt(static_cast<size_t>(pos));
 231                 wxLogTrace(wxTRACE_FSWATCHER,
 232                        "Removed wd %i from the stale-wd cache", inevt.wd);
 233             }
 234             return;
 235         }
 236
 237         // get watch entry for this event
 238         wxFSWatchEntryDescriptors::iterator it = m_watchMap.find(inevt.wd);
 239
 240         // wd will be -1 for IN_Q_OVERFLOW, which would trigger the wxFAIL_MSG
 241         if (inevt.wd != -1)
 242         {
 243             if (it == m_watchMap.end())
 244             {
 245                 // It's not in the map; check if was recently removed from it.
 246                 if (m_staleDescriptors.Index(inevt.wd) != wxNOT_FOUND)
 247                 {
 248                     wxLogTrace(wxTRACE_FSWATCHER,
 249                                "Got an event for stale wd %i", inevt.wd);
 250                 }
 251                 else
 252                 {
 253                     // In theory we shouldn't reach here. In practice, some
 254                     // events, e.g. IN_MODIFY, arrive just after the IN_IGNORED
 255                     // so their wd has already been discarded. Warn about them.
 256                     wxFileSystemWatcherEvent
 257                         event
 258                         (
 259                             wxFSW_EVENT_WARNING,
 260                             wxString::Format
 261                             (
 262                              _("Unexpected event for \"%s\": no "
 263                                "matching watch descriptor."),
 264                              inevt.len ? inevt.name : ""
 265                             )
 266                         );
 267                     SendEvent(event);
 268
 269                 }
 270
 271                 // In any case, don't process this event: it's either for an
 272                 // already removed entry, or for an unknown one.
 273                 return;
 274             }
 275         }
 276
 277         int nativeFlags = inevt.mask;
 278         int flags = Native2WatcherFlags(nativeFlags);
 279
 280         // check out for error/warning condition
 281         if (flags & wxFSW_EVENT_WARNING || flags & wxFSW_EVENT_ERROR)
 282         {
 283             wxString errMsg = GetErrorDescription(nativeFlags);
 284             wxFileSystemWatcherEvent event(flags, errMsg);
 285             SendEvent(event);
 286             return;
 287         }
 288
 289         if (inevt.wd == -1)
 290         {
 291             // Although this is not supposed to happen, we seem to be getting
 292             // occasional IN_ACCESS/IN_MODIFY events without valid watch value.
 293             wxFileSystemWatcherEvent
 294                 event
 295                 (
 296                     wxFSW_EVENT_WARNING,
 297                     wxString::Format
 298                     (
 299                         _("Invalid inotify event for \"%s\""),
 300                         inevt.len ? inevt.name : ""
 301                     )
 302                 );
 303             SendEvent(event);
 304             return;
 305         }
 306
 307         wxFSWatchEntry& watch = *(it->second);
 308
 309         // Now IN_UNMOUNT. We must do so here, as it's not in the watch flags
 310         if (nativeFlags & IN_UNMOUNT)
 311         {
 312             wxFileName path = GetEventPath(watch, inevt);
 313             wxFileSystemWatcherEvent event(wxFSW_EVENT_UNMOUNT, path, path);
 314             SendEvent(event);
 315         }
 316         // filter out ignored events and those not asked for.
 317         // we never filter out warnings or exceptions
 318         else if ((flags == 0) || !(flags & watch.GetFlags()))
 319         {
 320             return;
 321         }
 322
 323         // Creation
 324         // We need do something here only if the original watch was recursive;
 325         // we don't watch a child dir itself inside a non-tree watch.
 326         // We watch only dirs explicitly, so we don't want file IN_CREATEs.
 327         // Distinguish by whether nativeFlags contain IN_ISDIR
 328         else if ((nativeFlags & IN_CREATE) &&
 329                  (watch.GetType() == wxFSWPath_Tree) && (inevt.mask & IN_ISDIR))
 330         {
 331             wxFileName fn = GetEventPath(watch, inevt);
 332             // Though it's a dir, fn treats it as a file. So:
 333             fn.AssignDir(fn.GetFullPath());
 334
 335             if (m_watcher->AddAny(fn, wxFSW_EVENT_ALL,
 336                                    wxFSWPath_Tree, watch.GetFilespec()))
 337             {
 338                 // Tell the owner, in case it's interested
 339                 // If there's a filespec, assume he's not
 340                 if (watch.GetFilespec().empty())
 341                 {
 342                     wxFileSystemWatcherEvent event(flags, fn, fn);
 343                     SendEvent(event);
 344                 }
 345             }
 346         }
 347
 348         // Deletion
 349         // We watch only dirs explicitly, so we don't want file IN_DELETEs.
 350         // We obviously can't check using DirExists() as the object has been
 351         // deleted; and nativeFlags here doesn't contain IN_ISDIR, even for
 352         // a dir. Fortunately IN_DELETE_SELF doesn't happen for files. We need
 353         // to do something here only inside a tree watch, or if it's the parent
 354         // dir that's deleted. Otherwise let the parent dir cope
 355         else if ((nativeFlags & IN_DELETE_SELF) &&
 356                     ((watch.GetType() == wxFSWPath_Dir) ||
 357                      (watch.GetType() == wxFSWPath_Tree)))
 358         {
 359             // We must remove the deleted directory from the map, so that
 360             // DoRemoveInotify() isn't called on it in the future. Don't assert
 361             // if the wd isn't found: repeated IN_DELETE_SELFs can occur
 362             wxFileName fn = GetEventPath(watch, inevt);
 363             wxString path(fn.GetPathWithSep());
 364
 365             if (m_watchMap.erase(inevt.wd) == 1)
 366             {
 367                 // Delete from wxFileSystemWatcher
 368                 wxDynamicCast(m_watcher, wxInotifyFileSystemWatcher)->
 369                                             OnDirDeleted(path);
 370
 371                 // Now remove from our local list of watched items
 372                 wxFSWatchEntries::iterator wit =
 373                                         m_watches.find(path);
 374                 if (wit != m_watches.end())
 375                 {
 376                     m_watches.erase(wit);
 377                 }
 378
 379                 // Cache the wd in case any events arrive late
 380                 m_staleDescriptors.Add(inevt.wd);
 381             }
 382
 383             // Tell the owner, in case it's interested
 384             // If there's a filespec, assume he's not
 385             if (watch.GetFilespec().empty())
 386             {
 387                 wxFileSystemWatcherEvent event(flags, fn, fn);
 388                 SendEvent(event);
 389             }
 390         }
 391
 392         // renames
 393         else if (nativeFlags & IN_MOVE)
 394         {
 395             wxInotifyCookies::iterator it2 = m_cookies.find(inevt.cookie);
 396             if ( it2 == m_cookies.end() )
 397             {
 398                 int size = sizeof(inevt) + inevt.len;
 399                 inotify_event* e = (inotify_event*) operator new (size);
 400                 memcpy(e, &inevt, size);
 401
 402                 wxInotifyCookies::value_type val(e->cookie, e);
 403                 m_cookies.insert(val);
 404             }
 405             else
 406             {
 407                 inotify_event& oldinevt = *(it2->second);
 408
 409                 // Tell the owner, in case it's interested
 410                 // If there's a filespec, assume he's not
 411                 if ( watch.GetFilespec().empty() )
 412                 {
 413                     wxFileSystemWatcherEvent event(flags);
 414                     if ( inevt.mask & IN_MOVED_FROM )
 415                     {
 416                         event.SetPath(GetEventPath(watch, inevt));
 417                         event.SetNewPath(GetEventPath(watch, oldinevt));
 418                     }
 419                     else
 420                     {
 421                         event.SetPath(GetEventPath(watch, oldinevt));
 422                         event.SetNewPath(GetEventPath(watch, inevt));
 423                     }
 424                     SendEvent(event);
 425                 }
 426
 427                 m_cookies.erase(it2);
 428                 delete &oldinevt;
 429             }
 430         }
 431         // every other kind of event
 432         else
 433         {
 434             wxFileName path = GetEventPath(watch, inevt);
 435             // For files, check that it matches any filespec
 436             if ( MatchesFilespec(path, watch.GetFilespec()) )
 437             {
 438                 wxFileSystemWatcherEvent event(flags, path, path);
 439                 SendEvent(event);
 440             }
 441         }
 442     }
 443
 444     void ProcessRenames()
 445     {
 446         wxInotifyCookies::iterator it = m_cookies.begin();
 447         while ( it != m_cookies.end() )
 448         {
 449             inotify_event& inevt = *(it->second);
 450
 451             wxLogTrace(wxTRACE_FSWATCHER, "Processing pending rename events");
 452             wxLogTrace(wxTRACE_FSWATCHER, InotifyEventToString(inevt));
 453
 454             // get watch entry for this event
 455             wxFSWatchEntryDescriptors::iterator wit = m_watchMap.find(inevt.wd);
 456             if (wit == m_watchMap.end())
 457             {
 458                 wxLogTrace(wxTRACE_FSWATCHER,
 459                             "Watch descriptor not present in the watch map!");
 460             }
 461             else
 462             {
 463                 // Tell the owner, in case it's interested
 464                 // If there's a filespec, assume he's not
 465                 wxFSWatchEntry& watch = *(wit->second);
 466                 if ( watch.GetFilespec().empty() )
 467                 {
 468                     int flags = Native2WatcherFlags(inevt.mask);
 469                     wxFileName path = GetEventPath(watch, inevt);
 470                     {
 471                         wxFileSystemWatcherEvent event(flags, path, path);
 472                         SendEvent(event);
 473                     }
 474                 }
 475             }
 476
 477             m_cookies.erase(it);
 478             delete &inevt;
 479             it = m_cookies.begin();
 480         }
 481     }
 482
 483     void SendEvent(wxFileSystemWatcherEvent& evt)
 484     {
 485         wxLogTrace(wxTRACE_FSWATCHER, evt.ToString());
 486         m_watcher->GetOwner()->ProcessEvent(evt);
 487     }
 488
 489     int ReadEventsToBuf(char* buf, int size)
 490     {
 491         wxCHECK_MSG( IsOk(), false,
 492                     "Inotify not initialized or invalid inotify descriptor" );
 493
 494         memset(buf, 0, size);
 495         ssize_t left = read(m_ifd, buf, size);
 496         if (left == -1)
 497         {
 498             wxLogSysError(_("Unable to read from inotify descriptor"));
 499             return -1;
 500         }
 501         else if (left == 0)
 502         {
 503             wxLogWarning(_("EOF while reading from inotify descriptor"));
 504             return -1;
 505         }
 506
 507         return left;
 508     }
 509
 510     static wxString InotifyEventToString(const inotify_event& inevt)
 511     {
 512         wxString mask = (inevt.mask & IN_ISDIR) ?
 513                         wxString::Format("IS_DIR | %u", inevt.mask & ~IN_ISDIR) :
 514                         wxString::Format("%u", inevt.mask);
 515         const char* name = "";
 516         if (inevt.len)
 517             name = inevt.name;
 518         return wxString::Format("Event: wd=%d, mask=%s, cookie=%u, len=%u, "
 519                                 "name=%s", inevt.wd, mask, inevt.cookie,
 520                                 inevt.len, name);
 521     }
 522
 523     static wxFileName GetEventPath(const wxFSWatchEntry& watch,
 524                                    const inotify_event& inevt)
 525     {
 526         // only when dir is watched, we have non-empty e.name
 527         wxFileName path = watch.GetPath();
 528         if (path.IsDir() && inevt.len)
 529         {
 530             path = wxFileName(path.GetPath(), inevt.name);
 531         }
 532         return path;
 533     }
 534
 535     static int Watcher2NativeFlags(int flags)
 536     {
 537         // Start with the standard case of wanting all events
 538         if (flags == wxFSW_EVENT_ALL)
 539         {
 540             return IN_ALL_EVENTS;
 541         }
 542
 543         static const int flag_mapping[][2] = {
 544             { wxFSW_EVENT_ACCESS, IN_ACCESS   },
 545             { wxFSW_EVENT_MODIFY, IN_MODIFY   },
 546             { wxFSW_EVENT_ATTRIB, IN_ATTRIB   },
 547             { wxFSW_EVENT_RENAME, IN_MOVE     },
 548             { wxFSW_EVENT_CREATE, IN_CREATE   },
 549             { wxFSW_EVENT_DELETE, IN_DELETE|IN_DELETE_SELF|IN_MOVE_SELF },
 550             { wxFSW_EVENT_UNMOUNT, IN_UNMOUNT }
 551             // wxFSW_EVENT_ERROR/WARNING make no sense here
 552         };
 553
 554         int native_flags = 0;
 555         for ( unsigned int i=0; i < WXSIZEOF(flag_mapping); ++i)
 556         {
 557             if (flags & flag_mapping[i][0])
 558                 native_flags |= flag_mapping[i][1];
 559         }
 560
 561         return native_flags;
 562     }
 563
 564     static int Native2WatcherFlags(int flags)
 565     {
 566         static const int flag_mapping[][2] = {
 567             { IN_ACCESS,        wxFSW_EVENT_ACCESS }, // generated during read!
 568             { IN_MODIFY,        wxFSW_EVENT_MODIFY },
 569             { IN_ATTRIB,        wxFSW_EVENT_ATTRIB },
 570             { IN_CLOSE_WRITE,   0 },
 571             { IN_CLOSE_NOWRITE, 0 },
 572             { IN_OPEN,          0 },
 573             { IN_MOVED_FROM,    wxFSW_EVENT_RENAME },
 574             { IN_MOVED_TO,      wxFSW_EVENT_RENAME },
 575             { IN_CREATE,        wxFSW_EVENT_CREATE },
 576             { IN_DELETE,        wxFSW_EVENT_DELETE },
 577             { IN_DELETE_SELF,   wxFSW_EVENT_DELETE },
 578             { IN_MOVE_SELF,     wxFSW_EVENT_DELETE },
 579
 580             { IN_UNMOUNT,       wxFSW_EVENT_UNMOUNT},
 581             { IN_Q_OVERFLOW,    wxFSW_EVENT_WARNING},
 582
 583             // ignored, because this is generated mainly by watcher::Remove()
 584             { IN_IGNORED,        0 }
 585         };
 586
 587         unsigned int i=0;
 588         for ( ; i < WXSIZEOF(flag_mapping); ++i) {
 589             // in this mapping multiple flags at once don't happen
 590             if (flags & flag_mapping[i][0])
 591                 return flag_mapping[i][1];
 592         }
 593
 594         // never reached
 595         wxFAIL_MSG(wxString::Format("Unknown inotify event mask %u", flags));
 596         return -1;
 597     }
 598
 599     /**
 600      * Returns error description for specified inotify mask
 601      */
 602     static const wxString GetErrorDescription(int flag)
 603     {
 604         switch ( flag )
 605         {
 606         case IN_Q_OVERFLOW:
 607             return _("Event queue overflowed");
 608         }
 609
 610         // never reached
 611         wxFAIL_MSG(wxString::Format("Unknown inotify event mask %u", flag));
 612         return wxEmptyString;
 613     }
 614
 615     wxFSWSourceHandler* m_handler;        // handler for inotify event source
 616     wxFSWatchEntryDescriptors m_watchMap; // inotify wd=>wxFSWatchEntry* map
 617     wxArrayInt m_staleDescriptors;        // stores recently-removed watches
 618     wxInotifyCookies m_cookies;           // map to track renames
 619     wxEventLoopSource* m_source;          // our event loop source
 620
 621     // file descriptor created by inotify_init()
 622     int m_ifd;
 623 };
 624
 625
 626 // ============================================================================
 627 // wxFSWSourceHandler implementation
 628 // ============================================================================
 629
 630 // once we get signaled to read, actuall event reading occurs
 631 void wxFSWSourceHandler::OnReadWaiting()
 632 {
 633     wxLogTrace(wxTRACE_FSWATCHER, "--- OnReadWaiting ---");
 634     m_service->ReadEvents();
 635 }
 636
 637 void wxFSWSourceHandler::OnWriteWaiting()
 638 {
 639     wxFAIL_MSG("We never write to inotify descriptor.");
 640 }
 641
 642 void wxFSWSourceHandler::OnExceptionWaiting()
 643 {
 644     wxFAIL_MSG("We never receive exceptions on inotify descriptor.");
 645 }
 646
 647
 648 // ============================================================================
 649 // wxInotifyFileSystemWatcher implementation
 650 // ============================================================================
 651
 652 wxInotifyFileSystemWatcher::wxInotifyFileSystemWatcher()
 653     : wxFileSystemWatcherBase()
 654 {
 655     Init();
 656 }
 657
 658 wxInotifyFileSystemWatcher::wxInotifyFileSystemWatcher(const wxFileName& path,
 659                                                        int events)
 660     : wxFileSystemWatcherBase()
 661 {
 662     if (!Init())
 663     {
 664         if (m_service)
 665             delete m_service;
 666         return;
 667     }
 668
 669     Add(path, events);
 670 }
 671
 672 wxInotifyFileSystemWatcher::~wxInotifyFileSystemWatcher()
 673 {
 674 }
 675
 676 bool wxInotifyFileSystemWatcher::Init()
 677 {
 678     m_service = new wxFSWatcherImplUnix(this);
 679     return m_service->Init();
 680 }
 681
 682 void wxInotifyFileSystemWatcher::OnDirDeleted(const wxString& path)
 683 {
 684     if (!path.empty())
 685     {
 686         wxFSWatchInfoMap::iterator it = m_watches.find(path);
 687         wxCHECK_RET(it != m_watches.end(),
 688                     wxString::Format("Path '%s' is not watched", path));
 689
 690         // path has been deleted, so we must forget it whatever its refcount
 691         m_watches.erase(it);
 692     }
 693 }
 694
 695 #endif // wxHAS_INOTIFY
 696
 697 #endif // wxUSE_FSWATCHER