63 lines
1.1 KiB
C
63 lines
1.1 KiB
C
|
/* demlock.c - SVC handler for file file locking calls
|
||
|
|
*
|
||
|
|
* demLockOper
|
||
|
|
*
|
||
|
|
* Modification History:
|
||
|
|
*
|
||
|
|
* Sudeepb 07-Aug-1992 Created
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "dem.h"
|
||
|
|
#include "demmsg.h"
|
||
|
|
|
||
|
|
#include <softpc.h>
|
||
|
|
|
||
|
|
/* demLockOper - Lock or Unlock the file data
|
||
|
|
*
|
||
|
|
* Entry Client(AX) : Lock = 0 Unlock = 1
|
||
|
|
* Client(BX:BP) : NT Handle
|
||
|
|
* Client(CX:DX) : offset in the file
|
||
|
|
* Client(SI:DI) : Data Length to be locked
|
||
|
|
* Exit
|
||
|
|
* SUCCESS: Client CF = 0
|
||
|
|
* FAILURE: Client CF = 1
|
||
|
|
*/
|
||
|
|
|
||
|
|
VOID demLockOper (VOID)
|
||
|
|
{
|
||
|
|
HANDLE hFile;
|
||
|
|
DWORD dwFileOffset,cbLock;
|
||
|
|
|
||
|
|
// Collect all the parameters
|
||
|
|
hFile = GETHANDLE(getBX(),getBP());
|
||
|
|
dwFileOffset = GETULONG (getCX(),getDX());
|
||
|
|
cbLock = GETULONG (getSI(),getDI());
|
||
|
|
|
||
|
|
if(getAL() == 0){ // Locking case
|
||
|
|
if (LockFile (hFile,
|
||
|
|
dwFileOffset,
|
||
|
|
0,
|
||
|
|
cbLock,
|
||
|
|
0
|
||
|
|
) == TRUE) {
|
||
|
|
setCF (0);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
if (UnlockFile (hFile,
|
||
|
|
dwFileOffset,
|
||
|
|
0,
|
||
|
|
cbLock,
|
||
|
|
0
|
||
|
|
) == TRUE) {
|
||
|
|
setCF (0);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Operation failed
|
||
|
|
demClientError(hFile, (CHAR)-1);
|
||
|
|
return;
|
||
|
|
}
|