files/change.c

/*
 * Win32 file change notification functions
 *
 * Copyright 1998 Ulrich Weigand
 */

#include <assert.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <time.h>
#include "windows.h"
#include "winbase.h"
#include "winerror.h"
#include "process.h"
#include "thread.h"
#include "heap.h"
#include "server.h"
#include "debug.h"

static void CHANGE_Destroy( K32OBJ *obj );

const K32OBJ_OPS CHANGE_Ops =
{
    CHANGE_Destroy      /* destroy */
};

/* The change notification object */
typedef struct
{
    K32OBJ       header;
    LPSTR        lpPathName;
    BOOL32       bWatchSubtree;
    DWORD        dwNotifyFilter;
    BOOL32       notify;
} CHANGE_OBJECT;

/****************************************************************************
 *		CHANGE_Destroy
 */
static void CHANGE_Destroy( K32OBJ *obj )
{
    CHANGE_OBJECT *change = (CHANGE_OBJECT *)obj;
    assert( obj->type == K32OBJ_CHANGE );

    if ( change->lpPathName )
    {
        HeapFree( SystemHeap, 0, change->lpPathName );
        change->lpPathName = NULL;
    }

    obj->type = K32OBJ_UNKNOWN;
    HeapFree( SystemHeap, 0, change );
}

/****************************************************************************
 *		FindFirstChangeNotification32A (KERNEL32.248)
 */
HANDLE32 WINAPI FindFirstChangeNotification32A( LPCSTR lpPathName,
                                                BOOL32 bWatchSubtree,
                                                DWORD dwNotifyFilter ) 
{
    CHANGE_OBJECT *change;
    struct create_change_notification_request req;
    struct create_change_notification_reply reply;

    req.subtree = bWatchSubtree;
    req.filter  = dwNotifyFilter;
    CLIENT_SendRequest( REQ_CREATE_CHANGE_NOTIFICATION, -1, 1, &req, sizeof(req) );
    CLIENT_WaitSimpleReply( &reply, sizeof(reply), NULL );
    if (reply.handle == -1) return INVALID_HANDLE_VALUE32;

    change = HeapAlloc( SystemHeap, 0, sizeof(CHANGE_OBJECT) );
    if (!change)
    {
        CLIENT_CloseHandle( reply.handle );
        return INVALID_HANDLE_VALUE32;
    }

    change->header.type = K32OBJ_CHANGE;
    change->header.refcount = 1;

    change->lpPathName = HEAP_strdupA( SystemHeap, 0, lpPathName );
    change->bWatchSubtree = bWatchSubtree;
    change->dwNotifyFilter = dwNotifyFilter;
    change->notify = FALSE;

    return HANDLE_Alloc( PROCESS_Current(), &change->header, 
                         STANDARD_RIGHTS_REQUIRED|SYNCHRONIZE /*FIXME*/,
                         FALSE, reply.handle );
}

/****************************************************************************
 *		FindFirstChangeNotification32W (KERNEL32.249)
 */
HANDLE32 WINAPI FindFirstChangeNotification32W( LPCWSTR lpPathName,
                                                BOOL32 bWatchSubtree,
                                                DWORD dwNotifyFilter) 
{
    LPSTR nameA = HEAP_strdupWtoA( GetProcessHeap(), 0, lpPathName );
    HANDLE32 ret = FindFirstChangeNotification32A( nameA, bWatchSubtree, 
                                                          dwNotifyFilter );
    if (nameA) HeapFree( GetProcessHeap(), 0, nameA );
    return ret;
}

/****************************************************************************
 *		FindNextChangeNotification (KERNEL32.252)
 */
BOOL32 WINAPI FindNextChangeNotification( HANDLE32 handle ) 
{
    CHANGE_OBJECT *change;

    SYSTEM_LOCK();
    if (!(change = (CHANGE_OBJECT *)HANDLE_GetObjPtr( PROCESS_Current(),
                                                      handle, K32OBJ_CHANGE, 
                                                      0 /*FIXME*/, NULL )) )
    {
        SYSTEM_UNLOCK();
        return FALSE;
    }

    change->notify = FALSE;
    K32OBJ_DecCount( &change->header );
    SYSTEM_UNLOCK();
    return TRUE;
}

/****************************************************************************
 *		FindCloseChangeNotification (KERNEL32.247)
 */
BOOL32 WINAPI FindCloseChangeNotification( HANDLE32 handle) 
{
    return CloseHandle( handle );
}