src/unix/fswatcher_inotify.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        src/unix/fswatcher_inotify.cpp
// Purpose:     inotify-based wxFileSystemWatcher implementation
// Author:      Bartosz Bekier
// Created:     2009-05-26
// RCS-ID:      $Id$
// Copyright:   (c) 2009 Bartosz Bekier <bartosz.bekier@gmail.com>
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
    #pragma hdrstop
#endif

#if wxUSE_FSWATCHER

#include "wx/fswatcher.h"

#ifdef wxHAS_INOTIFY

#include <sys/inotify.h>
#include <unistd.h>
#include "wx/private/fswatcher.h"

// ============================================================================
// wxFSWatcherImpl implementation & helper wxFSWSourceHandler implementation
// ============================================================================

// inotify watch descriptor => wxFSWatchEntry* map
WX_DECLARE_HASH_MAP(int, wxFSWatchEntry*, wxIntegerHash, wxIntegerEqual,
                                              wxFSWatchEntryDescriptors);

// inotify event cookie => inotify_event* map
WX_DECLARE_HASH_MAP(int, inotify_event*, wxIntegerHash, wxIntegerEqual,
                                                      wxInotifyCookies);

/**
 * Helper class encapsulating inotify mechanism
 */
class wxFSWatcherImplUnix : public wxFSWatcherImpl
{
public:
    wxFSWatcherImplUnix(wxFileSystemWatcherBase* watcher) :
        wxFSWatcherImpl(watcher),
        m_source(NULL),
        m_ifd(-1)
    {
        m_handler = new wxFSWSourceHandler(this);
    }

    ~wxFSWatcherImplUnix()
    {
        // we close inotify only if initialized before
        if (IsOk())
        {
            Close();
        }

        delete m_handler;
    }

    bool Init()
    {
        wxCHECK_MSG( !IsOk(), false, "Inotify already initialized" );

        wxEventLoopBase *loop = wxEventLoopBase::GetActive();
        wxCHECK_MSG( loop, false, "File system watcher needs an event loop" );

        m_ifd = inotify_init();
        if ( m_ifd == -1 )
        {
            wxLogSysError( _("Unable to create inotify instance") );
            return false;
        }

        m_source = loop->AddSourceForFD
                         (
                          m_ifd,
                          m_handler,
                          wxEVENT_SOURCE_INPUT | wxEVENT_SOURCE_EXCEPTION
                         );

        return m_source != NULL;
    }

    void Close()
    {
        wxCHECK_RET( IsOk(),
                    "Inotify not initialized or invalid inotify descriptor" );

        wxDELETE(m_source);

        if ( close(m_ifd) != 0 )
        {
            wxLogSysError( _("Unable to close inotify instance") );
        }
    }

    virtual bool DoAdd(wxSharedPtr<wxFSWatchEntryUnix> watch)
    {
        wxCHECK_MSG( IsOk(), false,
                    "Inotify not initialized or invalid inotify descriptor" );

        int wd = DoAddInotify(watch.get());
        if (wd == -1)
        {
            wxLogSysError( _("Unable to add inotify watch") );
            return false;
        }

        wxFSWatchEntryDescriptors::value_type val(wd, watch.get());
        if (!m_watchMap.insert(val).second)
        {
            wxFAIL_MSG( wxString::Format( "Path %s is already watched",
                                           watch->GetPath()) );
            return false;
        }

        return true;
    }

    virtual bool DoRemove(wxSharedPtr<wxFSWatchEntryUnix> watch)
    {
        wxCHECK_MSG( IsOk(), false,
                    "Inotify not initialized or invalid inotify descriptor" );

        int ret = DoRemoveInotify(watch.get());
        if (ret == -1)
        {
            wxLogSysError( _("Unable to remove inotify watch") );
            return false;
        }

        if (m_watchMap.erase(watch->GetWatchDescriptor()) != 1)
        {
            wxFAIL_MSG( wxString::Format("Path %s is not watched",
                                          watch->GetPath()) );
        }
        watch->SetWatchDescriptor(-1);
        return true;
    }

    virtual bool RemoveAll()
    {
        wxFSWatchEntries::iterator it = m_watches.begin();
        for ( ; it != m_watches.end(); ++it )
        {
            (void) DoRemove(it->second);
        }
        m_watches.clear();
        return true;
    }

    int ReadEvents()
    {
        wxCHECK_MSG( IsOk(), -1,
                    "Inotify not initialized or invalid inotify descriptor" );

        // read events
        // TODO differentiate depending on params
        char buf[128 * sizeof(inotify_event)];
        int left = ReadEventsToBuf(buf, sizeof(buf));
        if (left == -1)
            return -1;

        // left > 0, we have events
        char* memory = buf;
        int event_count = 0;
        while (left > 0) // OPT checking 'memory' would suffice
        {
            event_count++;
            inotify_event* e = (inotify_event*)memory;

            // process one inotify_event
            ProcessNativeEvent(*e);

            int offset = sizeof(inotify_event) + e->len;
            left -= offset;
            memory += offset;
        }

        // take care of unmatched renames
        ProcessRenames();

        wxLogTrace(wxTRACE_FSWATCHER, "We had %d native events", event_count);
        return event_count;
    }

    bool IsOk() const
    {
        return m_source != NULL;
    }

protected:
    int DoAddInotify(wxFSWatchEntry* watch)
    {
        int flags = Watcher2NativeFlags(watch->GetFlags());
        int wd = inotify_add_watch(m_ifd, watch->GetPath().fn_str(), flags);
        // finally we can set watch descriptor
        watch->SetWatchDescriptor(wd);
        return wd;
    }

    int DoRemoveInotify(wxFSWatchEntry* watch)
    {
        return inotify_rm_watch(m_ifd, watch->GetWatchDescriptor());
    }

    void ProcessNativeEvent(const inotify_event& inevt)
    {
        wxLogTrace(wxTRACE_FSWATCHER, InotifyEventToString(inevt));

        // after removing inotify watch we get IN_IGNORED for it, but the watch
        // will be already removed from our list at that time
        if (inevt.mask & IN_IGNORED)
        {
            return;
        }

        // get watch entry for this event
        wxFSWatchEntryDescriptors::iterator it = m_watchMap.find(inevt.wd);
        wxCHECK_RET(it != m_watchMap.end(),
                             "Watch descriptor not present in the watch map!");

        wxFSWatchEntry& watch = *(it->second);
        int nativeFlags = inevt.mask;
        int flags = Native2WatcherFlags(nativeFlags);

        // check out for error/warning condition
        if (flags & wxFSW_EVENT_WARNING || flags & wxFSW_EVENT_ERROR)
        {
            wxString errMsg = GetErrorDescription(Watcher2NativeFlags(flags));
            wxFileSystemWatcherEvent event(flags, errMsg);
            SendEvent(event);
        }
        // filter out ignored events and those not asked for.
        // we never filter out warnings or exceptions
        else if ((flags == 0) || !(flags & watch.GetFlags()))
        {
            return;
        }
        // renames
        else if (nativeFlags & IN_MOVE)
        {
            wxInotifyCookies::iterator it = m_cookies.find(inevt.cookie);
            if ( it == m_cookies.end() )
            {
                int size = sizeof(inevt) + inevt.len;
                inotify_event* e = (inotify_event*) operator new (size);
                memcpy(e, &inevt, size);

                wxInotifyCookies::value_type val(e->cookie, e);
                m_cookies.insert(val);
            }
            else
            {
                inotify_event& oldinevt = *(it->second);

                wxFileSystemWatcherEvent event(flags);
                if ( inevt.mask & IN_MOVED_FROM )
                {
                    event.SetPath(GetEventPath(watch, inevt));
                    event.SetNewPath(GetEventPath(watch, oldinevt));
                }
                else
                {
                    event.SetPath(GetEventPath(watch, oldinevt));
                    event.SetNewPath(GetEventPath(watch, inevt));
                }
                SendEvent(event);

                m_cookies.erase(it);
                delete &oldinevt;
            }
        }
        // every other kind of event
        else
        {
            wxFileName path = GetEventPath(watch, inevt);
            wxFileSystemWatcherEvent event(flags, path, path);
            SendEvent(event);
        }
    }

    void ProcessRenames()
    {
        wxInotifyCookies::iterator it = m_cookies.begin();
        while ( it != m_cookies.end() )
        {
            inotify_event& inevt = *(it->second);

            wxLogTrace(wxTRACE_FSWATCHER, "Processing pending rename events");
            wxLogTrace(wxTRACE_FSWATCHER, InotifyEventToString(inevt));

            // get watch entry for this event
            wxFSWatchEntryDescriptors::iterator wit = m_watchMap.find(inevt.wd);
            wxCHECK_RET(wit != m_watchMap.end(),
                             "Watch descriptor not present in the watch map!");

            wxFSWatchEntry& watch = *(wit->second);
            int flags = Native2WatcherFlags(inevt.mask);
            wxFileName path = GetEventPath(watch, inevt);
            wxFileSystemWatcherEvent event(flags, path, path);
            SendEvent(event);

            m_cookies.erase(it);
            delete &inevt;
            it = m_cookies.begin();
        }
    }

    void SendEvent(wxFileSystemWatcherEvent& evt)
    {
        wxLogTrace(wxTRACE_FSWATCHER, evt.ToString());
        m_watcher->GetOwner()->ProcessEvent(evt);
    }

    int ReadEventsToBuf(char* buf, int size)
    {
        wxCHECK_MSG( IsOk(), false,
                    "Inotify not initialized or invalid inotify descriptor" );

        memset(buf, 0, size);
        ssize_t left = read(m_ifd, buf, size);
        if (left == -1)
        {
            wxLogSysError(_("Unable to read from inotify descriptor"));
            return -1;
        }
        else if (left == 0)
        {
            wxLogWarning(_("EOF while reading from inotify descriptor"));
            return -1;
        }

        return left;
    }

    static wxString InotifyEventToString(const inotify_event& inevt)
    {
        wxString mask = (inevt.mask & IN_ISDIR) ?
                        wxString::Format("IS_DIR | %u", inevt.mask & ~IN_ISDIR) :
                        wxString::Format("%u", inevt.mask);
        return wxString::Format("Event: wd=%d, mask=%s, cookie=%u, len=%u, "
                                "name=%s", inevt.wd, mask, inevt.cookie,
                                inevt.len, inevt.name);
    }

    static wxFileName GetEventPath(const wxFSWatchEntry& watch,
                                   const inotify_event& inevt)
    {
        // only when dir is watched, we have non-empty e.name
        wxFileName path = watch.GetPath();
        if (path.IsDir())
        {
            path = wxFileName(path.GetPath(), inevt.name);
        }
        return path;
    }

    static int Watcher2NativeFlags(int WXUNUSED(flags))
    {
        // TODO: it would be nice to subscribe only to the events we really need
        return IN_ALL_EVENTS;
    }

    static int Native2WatcherFlags(int flags)
    {
        static const int flag_mapping[][2] = {
            { IN_ACCESS,        wxFSW_EVENT_ACCESS }, // generated during read!
            { IN_MODIFY,        wxFSW_EVENT_MODIFY },
            { IN_ATTRIB,        0 },
            { IN_CLOSE_WRITE,   0 },
            { IN_CLOSE_NOWRITE, 0 },
            { IN_OPEN,          0 },
            { IN_MOVED_FROM,    wxFSW_EVENT_RENAME },
            { IN_MOVED_TO,      wxFSW_EVENT_RENAME },
            { IN_CREATE,        wxFSW_EVENT_CREATE },
            { IN_DELETE,        wxFSW_EVENT_DELETE },
            { IN_DELETE_SELF,   wxFSW_EVENT_DELETE },
            { IN_MOVE_SELF,     wxFSW_EVENT_DELETE },

            { IN_UNMOUNT,       wxFSW_EVENT_ERROR  },
            { IN_Q_OVERFLOW,    wxFSW_EVENT_WARNING},

            // ignored, because this is genereted mainly by watcher::Remove()
            { IN_IGNORED,        0 }
        };

        unsigned int i=0;
        for ( ; i < WXSIZEOF(flag_mapping); ++i) {
            // in this mapping multiple flags at once don't happen
            if (flags & flag_mapping[i][0])
                return flag_mapping[i][1];
        }

        // never reached
        wxFAIL_MSG(wxString::Format("Unknown inotify event mask %u", flags));
        return -1;
    }

    /**
     * Returns error description for specified inotify mask
     */
    static const wxString GetErrorDescription(int flag)
    {
        switch ( flag )
        {
        case IN_UNMOUNT:
            return _("File system containing watched object was unmounted");
        case IN_Q_OVERFLOW:
            return _("Event queue overflowed");
        }

        // never reached
        wxFAIL_MSG(wxString::Format("Unknown inotify event mask %u", flag));
        return wxEmptyString;
    }

    wxFSWSourceHandler* m_handler;        // handler for inotify event source
    wxFSWatchEntryDescriptors m_watchMap; // inotify wd=>wxFSWatchEntry* map
    wxInotifyCookies m_cookies;           // map to track renames
    wxEventLoopSource* m_source;          // our event loop source

    // file descriptor created by inotify_init()
    int m_ifd;
};


// ============================================================================
// wxFSWSourceHandler implementation
// ============================================================================

// once we get signaled to read, actuall event reading occurs
void wxFSWSourceHandler::OnReadWaiting()
{
    wxLogTrace(wxTRACE_FSWATCHER, "--- OnReadWaiting ---");
    m_service->ReadEvents();
}

void wxFSWSourceHandler::OnWriteWaiting()
{
    wxFAIL_MSG("We never write to inotify descriptor.");
}

void wxFSWSourceHandler::OnExceptionWaiting()
{
    wxFAIL_MSG("We never receive exceptions on inotify descriptor.");
}


// ============================================================================
// wxInotifyFileSystemWatcher implementation
// ============================================================================

wxInotifyFileSystemWatcher::wxInotifyFileSystemWatcher()
    : wxFileSystemWatcherBase()
{
    Init();
}

wxInotifyFileSystemWatcher::wxInotifyFileSystemWatcher(const wxFileName& path,
                                                       int events)
    : wxFileSystemWatcherBase()
{
    if (!Init())
    {
        if (m_service)
            delete m_service;
        return;
    }

    Add(path, events);
}

wxInotifyFileSystemWatcher::~wxInotifyFileSystemWatcher()
{
}

bool wxInotifyFileSystemWatcher::Init()
{
    m_service = new wxFSWatcherImplUnix(this);
    return m_service->Init();
}

#endif // wxHAS_INOTIFY

#endif // wxUSE_FSWATCHER
Commit	Line	Data
	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	watch->SetWatchDescriptor(-1);
	143	return true;
	144	}
	145
	146	virtual bool RemoveAll()
	147	{
	148	wxFSWatchEntries::iterator it = m_watches.begin();
	149	for ( ; it != m_watches.end(); ++it )
	150	{
	151	(void) DoRemove(it->second);
	152	}
	153	m_watches.clear();
	154	return true;
	155	}
	156
	157	int ReadEvents()
	158	{
	159	wxCHECK_MSG( IsOk(), -1,
	160	"Inotify not initialized or invalid inotify descriptor" );
	161
	162	// read events
	163	// TODO differentiate depending on params
	164	char buf[128 * sizeof(inotify_event)];
	165	int left = ReadEventsToBuf(buf, sizeof(buf));
	166	if (left == -1)
	167	return -1;
	168
	169	// left > 0, we have events
	170	char* memory = buf;
	171	int event_count = 0;
	172	while (left > 0) // OPT checking 'memory' would suffice
	173	{
	174	event_count++;
	175	inotify_event* e = (inotify_event*)memory;
	176
	177	// process one inotify_event
	178	ProcessNativeEvent(*e);
	179
	180	int offset = sizeof(inotify_event) + e->len;
	181	left -= offset;
	182	memory += offset;
	183	}
	184
	185	// take care of unmatched renames
	186	ProcessRenames();
	187
	188	wxLogTrace(wxTRACE_FSWATCHER, "We had %d native events", event_count);
	189	return event_count;
	190	}
	191
	192	bool IsOk() const
	193	{
	194	return m_source != NULL;
	195	}
	196
	197	protected:
	198	int DoAddInotify(wxFSWatchEntry* watch)
	199	{
	200	int flags = Watcher2NativeFlags(watch->GetFlags());
	201	int wd = inotify_add_watch(m_ifd, watch->GetPath().fn_str(), flags);
	202	// finally we can set watch descriptor
	203	watch->SetWatchDescriptor(wd);
	204	return wd;
	205	}
	206
	207	int DoRemoveInotify(wxFSWatchEntry* watch)
	208	{
	209	return inotify_rm_watch(m_ifd, watch->GetWatchDescriptor());
	210	}
	211
	212	void ProcessNativeEvent(const inotify_event& inevt)
	213	{
	214	wxLogTrace(wxTRACE_FSWATCHER, InotifyEventToString(inevt));
	215
	216	// after removing inotify watch we get IN_IGNORED for it, but the watch
	217	// will be already removed from our list at that time
	218	if (inevt.mask & IN_IGNORED)
	219	{
	220	return;
	221	}
	222
	223	// get watch entry for this event
	224	wxFSWatchEntryDescriptors::iterator it = m_watchMap.find(inevt.wd);
	225	wxCHECK_RET(it != m_watchMap.end(),
	226	"Watch descriptor not present in the watch map!");
	227
	228	wxFSWatchEntry& watch = *(it->second);
	229	int nativeFlags = inevt.mask;
	230	int flags = Native2WatcherFlags(nativeFlags);
	231
	232	// check out for error/warning condition
	233	if (flags & wxFSW_EVENT_WARNING \|\| flags & wxFSW_EVENT_ERROR)
	234	{
	235	wxString errMsg = GetErrorDescription(Watcher2NativeFlags(flags));
	236	wxFileSystemWatcherEvent event(flags, errMsg);
	237	SendEvent(event);
	238	}
	239	// filter out ignored events and those not asked for.
	240	// we never filter out warnings or exceptions
	241	else if ((flags == 0) \|\| !(flags & watch.GetFlags()))
	242	{
	243	return;
	244	}
	245	// renames
	246	else if (nativeFlags & IN_MOVE)
	247	{
	248	wxInotifyCookies::iterator it = m_cookies.find(inevt.cookie);
	249	if ( it == m_cookies.end() )
	250	{
	251	int size = sizeof(inevt) + inevt.len;
	252	inotify_event* e = (inotify_event*) operator new (size);
	253	memcpy(e, &inevt, size);
	254
	255	wxInotifyCookies::value_type val(e->cookie, e);
	256	m_cookies.insert(val);
	257	}
	258	else
	259	{
	260	inotify_event& oldinevt = *(it->second);
	261
	262	wxFileSystemWatcherEvent event(flags);
	263	if ( inevt.mask & IN_MOVED_FROM )
	264	{
	265	event.SetPath(GetEventPath(watch, inevt));
	266	event.SetNewPath(GetEventPath(watch, oldinevt));
	267	}
	268	else
	269	{
	270	event.SetPath(GetEventPath(watch, oldinevt));
	271	event.SetNewPath(GetEventPath(watch, inevt));
	272	}
	273	SendEvent(event);
	274
	275	m_cookies.erase(it);
	276	delete &oldinevt;
	277	}
	278	}
	279	// every other kind of event
	280	else
	281	{
	282	wxFileName path = GetEventPath(watch, inevt);
	283	wxFileSystemWatcherEvent event(flags, path, path);
	284	SendEvent(event);
	285	}
	286	}
	287
	288	void ProcessRenames()
	289	{
	290	wxInotifyCookies::iterator it = m_cookies.begin();
	291	while ( it != m_cookies.end() )
	292	{
	293	inotify_event& inevt = *(it->second);
	294
	295	wxLogTrace(wxTRACE_FSWATCHER, "Processing pending rename events");
	296	wxLogTrace(wxTRACE_FSWATCHER, InotifyEventToString(inevt));
	297
	298	// get watch entry for this event
	299	wxFSWatchEntryDescriptors::iterator wit = m_watchMap.find(inevt.wd);
	300	wxCHECK_RET(wit != m_watchMap.end(),
	301	"Watch descriptor not present in the watch map!");
	302
	303	wxFSWatchEntry& watch = *(wit->second);
	304	int flags = Native2WatcherFlags(inevt.mask);
	305	wxFileName path = GetEventPath(watch, inevt);
	306	wxFileSystemWatcherEvent event(flags, path, path);
	307	SendEvent(event);
	308
	309	m_cookies.erase(it);
	310	delete &inevt;
	311	it = m_cookies.begin();
	312	}
	313	}
	314
	315	void SendEvent(wxFileSystemWatcherEvent& evt)
	316	{
	317	wxLogTrace(wxTRACE_FSWATCHER, evt.ToString());
	318	m_watcher->GetOwner()->ProcessEvent(evt);
	319	}
	320
	321	int ReadEventsToBuf(char* buf, int size)
	322	{
	323	wxCHECK_MSG( IsOk(), false,
	324	"Inotify not initialized or invalid inotify descriptor" );
	325
	326	memset(buf, 0, size);
	327	ssize_t left = read(m_ifd, buf, size);
	328	if (left == -1)
	329	{
	330	wxLogSysError(_("Unable to read from inotify descriptor"));
	331	return -1;
	332	}
	333	else if (left == 0)
	334	{
	335	wxLogWarning(_("EOF while reading from inotify descriptor"));
	336	return -1;
	337	}
	338
	339	return left;
	340	}
	341
	342	static wxString InotifyEventToString(const inotify_event& inevt)
	343	{
	344	wxString mask = (inevt.mask & IN_ISDIR) ?
	345	wxString::Format("IS_DIR \| %u", inevt.mask & ~IN_ISDIR) :
	346	wxString::Format("%u", inevt.mask);
	347	return wxString::Format("Event: wd=%d, mask=%s, cookie=%u, len=%u, "
	348	"name=%s", inevt.wd, mask, inevt.cookie,
	349	inevt.len, inevt.name);
	350	}
	351
	352	static wxFileName GetEventPath(const wxFSWatchEntry& watch,
	353	const inotify_event& inevt)
	354	{
	355	// only when dir is watched, we have non-empty e.name
	356	wxFileName path = watch.GetPath();
	357	if (path.IsDir())
	358	{
	359	path = wxFileName(path.GetPath(), inevt.name);
	360	}
	361	return path;
	362	}
	363
	364	static int Watcher2NativeFlags(int WXUNUSED(flags))
	365	{
	366	// TODO: it would be nice to subscribe only to the events we really need
	367	return IN_ALL_EVENTS;
	368	}
	369
	370	static int Native2WatcherFlags(int flags)
	371	{
	372	static const int flag_mapping[][2] = {
	373	{ IN_ACCESS, wxFSW_EVENT_ACCESS }, // generated during read!
	374	{ IN_MODIFY, wxFSW_EVENT_MODIFY },
	375	{ IN_ATTRIB, 0 },
	376	{ IN_CLOSE_WRITE, 0 },
	377	{ IN_CLOSE_NOWRITE, 0 },
	378	{ IN_OPEN, 0 },
	379	{ IN_MOVED_FROM, wxFSW_EVENT_RENAME },
	380	{ IN_MOVED_TO, wxFSW_EVENT_RENAME },
	381	{ IN_CREATE, wxFSW_EVENT_CREATE },
	382	{ IN_DELETE, wxFSW_EVENT_DELETE },
	383	{ IN_DELETE_SELF, wxFSW_EVENT_DELETE },
	384	{ IN_MOVE_SELF, wxFSW_EVENT_DELETE },
	385
	386	{ IN_UNMOUNT, wxFSW_EVENT_ERROR },
	387	{ IN_Q_OVERFLOW, wxFSW_EVENT_WARNING},
	388
	389	// ignored, because this is genereted mainly by watcher::Remove()
	390	{ IN_IGNORED, 0 }
	391	};
	392
	393	unsigned int i=0;
	394	for ( ; i < WXSIZEOF(flag_mapping); ++i) {
	395	// in this mapping multiple flags at once don't happen
	396	if (flags & flag_mapping[i][0])
	397	return flag_mapping[i][1];
	398	}
	399
	400	// never reached
	401	wxFAIL_MSG(wxString::Format("Unknown inotify event mask %u", flags));
	402	return -1;
	403	}
	404
	405	/**
	406	* Returns error description for specified inotify mask
	407	*/
	408	static const wxString GetErrorDescription(int flag)
	409	{
	410	switch ( flag )
	411	{
	412	case IN_UNMOUNT:
	413	return _("File system containing watched object was unmounted");
	414	case IN_Q_OVERFLOW:
	415	return _("Event queue overflowed");
	416	}
	417
	418	// never reached
	419	wxFAIL_MSG(wxString::Format("Unknown inotify event mask %u", flag));
	420	return wxEmptyString;
	421	}
	422
	423	wxFSWSourceHandler* m_handler; // handler for inotify event source
	424	wxFSWatchEntryDescriptors m_watchMap; // inotify wd=>wxFSWatchEntry* map
	425	wxInotifyCookies m_cookies; // map to track renames
	426	wxEventLoopSource* m_source; // our event loop source
	427
	428	// file descriptor created by inotify_init()
	429	int m_ifd;
	430	};
	431
	432
	433	// ============================================================================
	434	// wxFSWSourceHandler implementation
	435	// ============================================================================
	436
	437	// once we get signaled to read, actuall event reading occurs
	438	void wxFSWSourceHandler::OnReadWaiting()
	439	{
	440	wxLogTrace(wxTRACE_FSWATCHER, "--- OnReadWaiting ---");
	441	m_service->ReadEvents();
	442	}
	443
	444	void wxFSWSourceHandler::OnWriteWaiting()
	445	{
	446	wxFAIL_MSG("We never write to inotify descriptor.");
	447	}
	448
	449	void wxFSWSourceHandler::OnExceptionWaiting()
	450	{
	451	wxFAIL_MSG("We never receive exceptions on inotify descriptor.");
	452	}
	453
	454
	455	// ============================================================================
	456	// wxInotifyFileSystemWatcher implementation
	457	// ============================================================================
	458
	459	wxInotifyFileSystemWatcher::wxInotifyFileSystemWatcher()
	460	: wxFileSystemWatcherBase()
	461	{
	462	Init();
	463	}
	464
	465	wxInotifyFileSystemWatcher::wxInotifyFileSystemWatcher(const wxFileName& path,
	466	int events)
	467	: wxFileSystemWatcherBase()
	468	{
	469	if (!Init())
	470	{
	471	if (m_service)
	472	delete m_service;
	473	return;
	474	}
	475
	476	Add(path, events);
	477	}
	478
	479	wxInotifyFileSystemWatcher::~wxInotifyFileSystemWatcher()
	480	{
	481	}
	482
	483	bool wxInotifyFileSystemWatcher::Init()
	484	{
	485	m_service = new wxFSWatcherImplUnix(this);
	486	return m_service->Init();
	487	}
	488
	489	#endif // wxHAS_INOTIFY
	490
	491	#endif // wxUSE_FSWATCHER