Sweden-Number/files/change.c

189 lines
5.4 KiB
C

/*
* Win32 file change notification functions
*
* Copyright 1998 Ulrich Weigand
*/
#include <errno.h>
#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 "debug.h"
static BOOL32 CHANGE_Signaled( K32OBJ *obj, DWORD thread_id );
static BOOL32 CHANGE_Satisfied( K32OBJ *obj, DWORD thread_id );
static void CHANGE_AddWait( K32OBJ *obj, DWORD thread_id );
static void CHANGE_RemoveWait( K32OBJ *obj, DWORD thread_id );
static void CHANGE_Destroy( K32OBJ *obj );
const K32OBJ_OPS CHANGE_Ops =
{
CHANGE_Signaled, /* signaled */
CHANGE_Satisfied, /* satisfied */
CHANGE_AddWait, /* add_wait */
CHANGE_RemoveWait, /* remove_wait */
NULL, /* read */
NULL, /* write */
CHANGE_Destroy /* destroy */
};
/* The change notification object */
typedef struct
{
K32OBJ header;
LPSTR lpPathName;
BOOL32 bWatchSubtree;
DWORD dwNotifyFilter;
THREAD_QUEUE wait_queue;
BOOL32 notify;
} CHANGE_OBJECT;
/***********************************************************************
* CHANGE_Signaled
*/
static BOOL32 CHANGE_Signaled( K32OBJ *obj, DWORD thread_id )
{
CHANGE_OBJECT *change = (CHANGE_OBJECT *)obj;
assert( obj->type == K32OBJ_CHANGE );
return change->notify;
}
/***********************************************************************
* CHANGE_Satisfied
*
* Wait on this object has been satisfied.
*/
static BOOL32 CHANGE_Satisfied( K32OBJ *obj, DWORD thread_id )
{
assert( obj->type == K32OBJ_CHANGE );
return FALSE; /* Not abandoned */
}
/***********************************************************************
* CHANGE_AddWait
*
* Add thread to object wait queue.
*/
static void CHANGE_AddWait( K32OBJ *obj, DWORD thread_id )
{
CHANGE_OBJECT *change = (CHANGE_OBJECT *)obj;
assert( obj->type == K32OBJ_CHANGE );
THREAD_AddQueue( &change->wait_queue, THREAD_ID_TO_THDB(thread_id) );
}
/***********************************************************************
* CHANGE_RemoveWait
*
* Remove thread from object wait queue.
*/
static void CHANGE_RemoveWait( K32OBJ *obj, DWORD thread_id )
{
CHANGE_OBJECT *change = (CHANGE_OBJECT *)obj;
assert( obj->type == K32OBJ_CHANGE );
THREAD_RemoveQueue( &change->wait_queue, THREAD_ID_TO_THDB(thread_id) );
}
/****************************************************************************
* 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 )
{
HANDLE32 handle;
CHANGE_OBJECT *change;
change = HeapAlloc( SystemHeap, 0, sizeof(CHANGE_OBJECT) );
if (!change) 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->wait_queue = NULL;
change->notify = FALSE;
handle = HANDLE_Alloc( PROCESS_Current(), &change->header,
FILE_ALL_ACCESS /*FIXME*/, TRUE, -1 );
/* If the allocation failed, the object is already destroyed */
if (handle == INVALID_HANDLE_VALUE32) change = NULL;
return 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 );
}