620 lines
14 KiB
C
620 lines
14 KiB
C
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/* demhndl.c - SVC handlers for calls where file handle is provided.
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*
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* demClose
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* demRead
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* demWrite
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* demChgFilePtr
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* demFileTimes
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*
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* Modification History:
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*
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* Sudeepb 02-Apr-1991 Created
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* rfirth 25-Sep-1991 Added Vdm Redir stuff for named pipes
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*/
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#include "dem.h"
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#include "demmsg.h"
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#include <softpc.h>
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#include <io.h>
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#include <fcntl.h>
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#include <vrnmpipe.h>
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#include <exterr.h>
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#include <mvdm.h>
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BOOL (*VrInitialized)(VOID); // POINTER TO FUNCTION
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extern BOOL IsVdmRedirLoaded(VOID);
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/* demClose - Close a file
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*
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*
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* Entry - Client (AX:BP) File Handle
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* Client (CX:DX) File position (if -1 no seek needed before closing
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* the handle.
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* (VadimB)
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* Client (es:di) SFT ptr - this is implied in abort.asm code
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*
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* Exit
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* SUCCESS
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* Client (CY) = 0
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*
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* FAILURE
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* Client (CY) = 1
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* Client (AX) = system status code
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*
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*/
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VOID demClose (VOID)
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{
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HANDLE hFile;
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LONG lLoc;
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USHORT usDX,usCX;
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hFile = GETHANDLE (getAX(),getBP());
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if (hFile == 0) {
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setCF (0);
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return;
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}
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usCX = getCX();
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usDX = getDX();
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if (!((usCX == (USHORT)-1) && (usDX == (USHORT)-1))) {
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lLoc = (LONG)((((int)usCX) << 16) + (int)usDX);
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if (SetFilePointer (hFile,
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lLoc,
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NULL,
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FILE_BEGIN) == -1L){
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demClientError(hFile, (CHAR)-1);
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return ;
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}
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}
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if (CloseHandle (hFile) == FALSE){
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demClientError(hFile, (CHAR)-1);
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return;
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}
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//
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// if the redir TSR is being run in this VDM session, check if the handle
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// being closed references a named pipe - we have to delete some info
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// that we keep for the open named pipe
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//
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if (IsVdmRedirLoaded()) {
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VrRemoveOpenNamedPipeInfo(hFile);
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}
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setCF(0);
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return;
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}
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/* demRead - Read a file
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*
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*
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* Entry - Client (AX:BP) File Handle
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* Client (CX) Count to read
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* Client (DS:DX) Buffer Address
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* Client (BX:SI) = current file pointer location.
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* ZF = 1 if seek is not needed prior to read.
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*
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* Exit
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* SUCCESS
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* Client (CY) = 0
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* Client (AX) = Count of bytes read
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*
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* FAILURE
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* Client (CY) = 1
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* Client (AX) = system status code
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*
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*/
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VOID demRead (VOID)
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{
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HANDLE hFile;
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LPVOID lpBuf;
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DWORD dwBytesRead;
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USHORT usDS,usDX;
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DWORD dwReadError;
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BOOL ok;
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UCHAR locus, action, class;
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LONG lLoc;
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hFile = GETHANDLE (getAX(),getBP());
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usDS = getDS();
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usDX = getDX();
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lpBuf = (LPVOID) GetVDMAddr (usDS,usDX);
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//
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// if this handle is a named pipe then use VrReadNamedPipe since we have
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// to perform an overlapped read, and wait on the event handle for completion
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// even though we're still doing synchronous read
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//
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if (IsVdmRedirLoaded()) {
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if (VrIsNamedPipeHandle(hFile)) {
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//
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// named pipe read always sets the extended error information in the
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// DOS data segment. This is the only way we can return bytes read
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// information and a more data indication
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//
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ok = VrReadNamedPipe(hFile,
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lpBuf,
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(DWORD)getCX(),
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&dwBytesRead,
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&dwReadError
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);
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switch (dwReadError) {
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case NO_ERROR:
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locus = action = class = 0;
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break;
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case ERROR_NO_DATA:
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case ERROR_MORE_DATA:
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locus = errLOC_Net;
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class = errCLASS_TempSit;
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action = errACT_Retry;
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break;
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default:
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//
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// any error other than the specific ones we handle here should be
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// correctly handled by DOS
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//
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goto readFailureExit;
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}
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pExtendedError->ExtendedErrorLocus = locus;
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STOREWORD(pExtendedError->ExtendedError, (WORD)dwReadError);
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pExtendedError->ExtendedErrorAction = action;
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pExtendedError->ExtendedErrorClass = class;
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if (ok) {
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goto readSuccessExit;
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} else {
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goto readFailureExit;
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}
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}
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}
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//
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// if the redir TSR is not loaded, or the handle is not a named pipe then
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// perform normal file read
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//
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if (!getZF()) {
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ULONG Zero = 0;
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lLoc = (LONG)((((int)getBX()) << 16) + (int)getSI());
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if ((SetFilePointer (hFile,
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lLoc,
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&Zero,
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FILE_BEGIN) == -1L) &&
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(GetLastError() != NO_ERROR)) {
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goto readFailureExit;
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}
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}
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if (ReadFile (hFile,
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lpBuf,
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(DWORD)getCX(),
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&dwBytesRead,
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NULL) == FALSE){
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readFailureExit:
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Sim32FlushVDMPointer (((ULONG)(usDS << 16)) | usDX, getCX(),
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(PBYTE )lpBuf, FALSE);
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Sim32FreeVDMPointer (((ULONG)(usDS << 16)) | usDX, getCX(),
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(PBYTE )lpBuf, FALSE);
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if (GetLastError() == ERROR_BROKEN_PIPE) {
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setAX(0);
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setCF(0);
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return;
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}
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demClientError(hFile, (CHAR)-1);
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return ;
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}
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readSuccessExit:
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Sim32FlushVDMPointer (((ULONG)(usDS << 16)) | usDX, getCX(),
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(PBYTE )lpBuf, FALSE);
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Sim32FreeVDMPointer (((ULONG)(usDS << 16)) | usDX, getCX(),
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(PBYTE )lpBuf, FALSE);
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setCF(0);
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setAX((USHORT)dwBytesRead);
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return;
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}
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/* demWrite - Write to a file
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*
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*
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* Entry - Client (AX:BP) File Handle
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* Client (CX) Count to write
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* Client (DS:DX) Buffer Address
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* Client (BX:SI) = current file pointer location.
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* ZF = 1 if seek is not needed prior to write.
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*
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* Exit
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* SUCCESS
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* Client (CY) = 0
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* Client (AX) = Count of bytes written
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*
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* FAILURE
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* Client (CY) = 1
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* Client (AX) = system status code
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*
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*/
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VOID demWrite (VOID)
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{
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HANDLE hFile;
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DWORD dwBytesWritten;
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LPVOID lpBuf;
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LONG lLoc;
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DWORD dwErrCode;
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hFile = GETHANDLE (getAX(),getBP());
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lpBuf = (LPVOID) GetVDMAddr (getDS(),getDX());
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//
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// if this handle is a named pipe then use VrWriteNamedPipe since we have
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// to perform an overlapped write, and wait on the event handle for completion
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// even though we're still doing synchronous write
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//
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if (IsVdmRedirLoaded()) {
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if (VrIsNamedPipeHandle(hFile)) {
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if (VrWriteNamedPipe(hFile, lpBuf, (DWORD)getCX(), &dwBytesWritten)) {
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goto writeSuccessExit;
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} else {
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goto writeFailureExit;
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}
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}
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}
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//
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// if the redir TSR is not loaded, or the handle is not a named pipe then
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// perform normal file write
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//
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if (!getZF()) {
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ULONG Zero = 0;
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lLoc = (LONG)((((int)getBX()) << 16) + (int)getSI());
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if ((SetFilePointer (hFile,
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lLoc,
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&Zero,
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FILE_BEGIN) == -1L) &&
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(GetLastError() != NO_ERROR)) {
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demClientError(hFile, (CHAR)-1);
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return ;
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}
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}
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// In DOS CX=0 truncates or extends the file to current file pointer.
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if (getCX() == 0){
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if (SetEndOfFile(hFile) == FALSE){
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demClientError(hFile, (CHAR)-1);
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return;
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}
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setCF (0);
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return;
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}
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if (WriteFile (hFile,
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lpBuf,
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(DWORD)getCX(),
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&dwBytesWritten,
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NULL) == FALSE){
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// If disk is full then we should return 0 byte written and CF is clear
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dwErrCode = GetLastError();
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if(dwErrCode == ERROR_DISK_FULL) {
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setCF(0);
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setAX(0);
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return;
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}
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SetLastError(dwErrCode);
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writeFailureExit:
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demClientError(hFile, (CHAR)-1);
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return ;
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}
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writeSuccessExit:
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setCF(0);
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setAX((USHORT)dwBytesWritten);
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return;
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}
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/* demChgFilePtr - Change File Pointer
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*
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*
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* Entry - Client (AX:BP) File Handle
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* Client (CX:DX) New Location
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* Client (BL) Positioning Method
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* 0 - File Absolute
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* 1 - Relative to Current Position
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* 2 - Relative to end of file
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*
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* Exit
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* SUCCESS
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* Client (CY) = 0
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* Client (DX:AX) = New Location
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*
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* FAILURE
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* Client (CY) = 1
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|||
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* Client (AX) = system status code
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*
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*/
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VOID demChgFilePtr (VOID)
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{
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HANDLE hFile;
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LONG lLoc;
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DWORD dwLoc;
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#if (FILE_BEGIN != 0 || FILE_CURRENT != 1 || FILE_END !=2)
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#error "Win32 values not DOS compatible"
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#
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#endif
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hFile = GETHANDLE (getAX(),getBP());
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lLoc = (LONG)((((int)getCX()) << 16) + (int)getDX());
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if ((dwLoc = SetFilePointer (hFile,
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lLoc,
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NULL,
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(DWORD)getBL())) == -1L){
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demClientError(hFile, (CHAR)-1);
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return ;
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|||
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}
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|||
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setCF(0);
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setAX((USHORT)dwLoc);
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setDX((USHORT)(dwLoc >> 16));
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return;
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}
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#if 0
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|
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/*
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|
|
* Completely moved to demlfn.c
|
|||
|
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*
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|||
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*
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|||
|
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*
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|||
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*/
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|
|
/* demFileTimes - Change or Get File date and times
|
|||
|
|
*
|
|||
|
|
* GET TIME (Client(BL) = 0)
|
|||
|
|
*
|
|||
|
|
* Entry
|
|||
|
|
* Client(AX:BP)
|
|||
|
|
* NT Handle
|
|||
|
|
*
|
|||
|
|
* Exit
|
|||
|
|
* SUCCESS
|
|||
|
|
* Client(CF) = 0
|
|||
|
|
* Client(CX) = File time
|
|||
|
|
* Client(DX) = File date
|
|||
|
|
* FAILURE
|
|||
|
|
* Client(CF) = 1
|
|||
|
|
* Client(AX) = error code
|
|||
|
|
*
|
|||
|
|
* SET TIME (Client(BL) = 1)
|
|||
|
|
*
|
|||
|
|
* Entry
|
|||
|
|
* Client(AX:BP)
|
|||
|
|
* Nt Handle
|
|||
|
|
* Client(CX)
|
|||
|
|
* New file time
|
|||
|
|
* Client(DX)
|
|||
|
|
* New file date
|
|||
|
|
*
|
|||
|
|
* Exit
|
|||
|
|
* SUCCESS
|
|||
|
|
* Client(CF) = 0
|
|||
|
|
* FAILURE
|
|||
|
|
* Client(CF) = 1
|
|||
|
|
* Client(AX) = error code
|
|||
|
|
*
|
|||
|
|
* Hard Error Exit
|
|||
|
|
* Client(CF) = 1
|
|||
|
|
* Client(AX) = 0FFFFh
|
|||
|
|
*
|
|||
|
|
* GET TIME For device (Client(BL) = 2)
|
|||
|
|
*
|
|||
|
|
* Entry
|
|||
|
|
* Client(AX:BP)
|
|||
|
|
* NT Handle - not in use
|
|||
|
|
*
|
|||
|
|
* Exit
|
|||
|
|
* SUCCESS
|
|||
|
|
* Client(CF) = 0
|
|||
|
|
* Client(CX) = Current time
|
|||
|
|
* Client(DX) = Curren date
|
|||
|
|
* FAILURE
|
|||
|
|
* None
|
|||
|
|
*
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
VOID demFileTimes (VOID)
|
|||
|
|
{
|
|||
|
|
HANDLE hFile;
|
|||
|
|
WORD wDate,wTime;
|
|||
|
|
FILETIME LastWriteTime,ftTemp;
|
|||
|
|
SYSTEMTIME stCurrentTime;
|
|||
|
|
UCHAR uchOpt = 0;
|
|||
|
|
|
|||
|
|
uchOpt = getBL();
|
|||
|
|
if(uchOpt != 2)
|
|||
|
|
hFile = GETHANDLE(getAX(),getBP());
|
|||
|
|
|
|||
|
|
if(uchOpt != 1){
|
|||
|
|
|
|||
|
|
if(!uchOpt) {
|
|||
|
|
if(GetFileTime (hFile,NULL,NULL,&LastWriteTime) == -1){
|
|||
|
|
demClientError(hFile, (CHAR)-1);
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
else { // Device case. We should return current time
|
|||
|
|
GetSystemTime(&stCurrentTime);
|
|||
|
|
SystemTimeToFileTime(&stCurrentTime, &LastWriteTime);
|
|||
|
|
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
FileTimeToLocalFileTime (&LastWriteTime,&ftTemp);
|
|||
|
|
if(FileTimeToDosDateTime(&ftTemp,
|
|||
|
|
(LPWORD)&wDate,
|
|||
|
|
(LPWORD)&wTime) == FALSE){
|
|||
|
|
demPrintMsg(MSG_TIMEDATE);
|
|||
|
|
setCF(0);
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
setCX(wTime);
|
|||
|
|
setDX(wDate);
|
|||
|
|
setCF(0);
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
wDate = getDX();
|
|||
|
|
wTime = getCX();
|
|||
|
|
|
|||
|
|
if (DosDateTimeToFileTime(wDate,
|
|||
|
|
wTime,
|
|||
|
|
&LastWriteTime) == FALSE){
|
|||
|
|
demPrintMsg(MSG_TIMEDATE);
|
|||
|
|
setCF(0);
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
LocalFileTimeToFileTime (&LastWriteTime,&ftTemp);
|
|||
|
|
|
|||
|
|
if(!SetFileTime(hFile,NULL,NULL,&ftTemp)){
|
|||
|
|
demClientError(hFile, (CHAR)-1);
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
setCF(0);
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
#endif
|
|||
|
|
|
|||
|
|
|
|||
|
|
/* DemCommit -- Commit File(Flush file buffers)
|
|||
|
|
*
|
|||
|
|
* Entry - Client (AX:BP) File Handle
|
|||
|
|
*
|
|||
|
|
* Exit
|
|||
|
|
* SUCCESS
|
|||
|
|
* Client (CY) = 0
|
|||
|
|
* buffer flushed
|
|||
|
|
*
|
|||
|
|
* FAILURE
|
|||
|
|
* Client (CY) = 1
|
|||
|
|
*
|
|||
|
|
*/
|
|||
|
|
VOID demCommit(VOID)
|
|||
|
|
{
|
|||
|
|
HANDLE hFile;
|
|||
|
|
BOOL bRet;
|
|||
|
|
|
|||
|
|
hFile = GETHANDLE(getAX(),getBP());
|
|||
|
|
bRet = FlushFileBuffers(hFile);
|
|||
|
|
#if DBG
|
|||
|
|
if (!bRet) {
|
|||
|
|
|
|||
|
|
//
|
|||
|
|
// FlushFileBuffers fails with access denied if the handle
|
|||
|
|
// is open for read-only access, however it's not an error
|
|||
|
|
// for DOS.
|
|||
|
|
//
|
|||
|
|
|
|||
|
|
DWORD LastError;
|
|||
|
|
LastError = GetLastError();
|
|||
|
|
|
|||
|
|
if (LastError != ERROR_ACCESS_DENIED) {
|
|||
|
|
sprintf(demDebugBuffer,
|
|||
|
|
"ntvdm demCommit warning: FlushFileBuffers error %d\n",
|
|||
|
|
LastError);
|
|||
|
|
OutputDebugStringOem(demDebugBuffer);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
#endif
|
|||
|
|
|
|||
|
|
setCF(0);
|
|||
|
|
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/* function to check if new data has been written to the file or
|
|||
|
|
if the file has been marked EOF
|
|||
|
|
|
|||
|
|
Input: Client (AX:BP) = 32bits NT file handle
|
|||
|
|
Output: Client ZF = 1 if new data or EOF
|
|||
|
|
CF = 1 if EOF
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
|
|||
|
|
VOID demPipeFileDataEOF(VOID)
|
|||
|
|
{
|
|||
|
|
HANDLE hFile;
|
|||
|
|
BOOL fEOF;
|
|||
|
|
BOOL DataEOF;
|
|||
|
|
DWORD FileSizeLow;
|
|||
|
|
DWORD FileSizeHigh;
|
|||
|
|
|
|||
|
|
hFile = GETHANDLE(getAX(), getBP());
|
|||
|
|
|
|||
|
|
DataEOF = cmdPipeFileDataEOF(hFile, &fEOF);
|
|||
|
|
if (fEOF) {
|
|||
|
|
//EOF, get file size, max size = 32bits
|
|||
|
|
FileSizeLow = GetFileSize(hFile, &FileSizeHigh);
|
|||
|
|
setAX((WORD)(FileSizeLow / 0x10000));
|
|||
|
|
setBP((WORD)FileSizeLow);
|
|||
|
|
setCF(1); // EOF is encountered
|
|||
|
|
}
|
|||
|
|
else
|
|||
|
|
setCF(0);
|
|||
|
|
setZF(DataEOF ? 0 : 1);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/* function to check if the file has been marked EOF
|
|||
|
|
Input: Client(AX:BP) = 32bits NT file handle
|
|||
|
|
Output: Client CY = 1 if EOF
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
VOID demPipeFileEOF(VOID)
|
|||
|
|
{
|
|||
|
|
HANDLE hFile;
|
|||
|
|
DWORD FileSizeLow;
|
|||
|
|
DWORD FileSizeHigh;
|
|||
|
|
|
|||
|
|
hFile = GETHANDLE(getAX(), getBP());
|
|||
|
|
if (cmdPipeFileEOF(hFile)) {
|
|||
|
|
FileSizeLow = GetFileSize(hFile, &FileSizeHigh);
|
|||
|
|
setAX((WORD)(FileSizeLow / 0x10000)); // file size in 32bits
|
|||
|
|
setBP((WORD)FileSizeLow);
|
|||
|
|
setCF(1); //EOF is encountered
|
|||
|
|
}
|
|||
|
|
else
|
|||
|
|
setCF(0);
|
|||
|
|
}
|
|||
|
|
|