/*--------------------------------------------------------------------------*
Name _dos_commit - commit a file handle
Usage unsigned _dos_commit(int handle);
Prototype in io.h
Description _dos_commit commits the file handle indicated by handle which is
obtained from a _dos_creat, _dos_creatnew, or _dos_open call.
Return value Upon successful completion, _dos_commit returns 0.
Otherwise, the DOS error code is returned, and errno is set to
EBADF Bad file number
*---------------------------------------------------------------------------*/
unsigned _dos_commit( int fd )
{
_AH = 0x68;
_BX = fd;
geninterrupt(0x21);
if (_FLAGS & 1) /* if carry set, error */
return (__DOSerror(_AX)); /* set errno */
else
return (0);
}
/*-----------------------------------------------------------------------*
Name _dos_unlock - resets file sharing locks
Usage int _dos_unlock(int handle, long offset, long length);
Related
functions usage unsigned _dos_lock(int handle, long offset, long length);
Prototype in none
Description see _dos_lock above
Return value see _dos_lock above
*------------------------------------------------------------------------*/
unsigned _dos_unlock(int handle, long offset, long length)
{
_BX = handle;
_CX = FP_SEG(offset);
_DX = FP_OFF(offset);
_SI = FP_SEG(length);
_DI = FP_OFF(length);
_AX = 0x5c01;
geninterrupt(0x21);
if (_FLAGS & 1) /* if carry set, error */
return (__DOSerror(_AX)); /* set errno */
else
return (0);
}
unsigned _RTLENTRY _EXPFUNC
_dos_read (int fd, void *buf, unsigned len, unsigned *nread)
{
DWORD actual;
if ((unsigned)fd >= _nfile)
{
__IOerror(ERROR_INVALID_HANDLE); /* set errno */
return (ERROR_INVALID_HANDLE); /* return fake NT error code */
}
if (ReadFile((HANDLE)_handles[fd], buf, (DWORD)len, &actual, NULL) != TRUE)
return (__DOSerror());
else
{
*nread = (unsigned)actual;
return (0);
}
}
unsigned _tDosCreate(_TCHAR *pathP, unsigned attr, int *handlep, unsigned disp)
{
HANDLE handle;
SECURITY_ATTRIBUTES sec; /* used only to set inheritance flag */
unsigned rc, oflag;
/* Set the inheritance flag in the security attributes.
*/
sec.nLength = sizeof(sec);
sec.lpSecurityDescriptor = NULL;
sec.bInheritHandle = TRUE;
/* Create the file.
*/
if ((handle = CreateFile(pathP, GENERIC_READ|GENERIC_WRITE,
FILE_SHARE_READ|FILE_SHARE_WRITE, &sec, disp,
attr, NULL)) == (HANDLE)-1)
return (__DOSerror());
/* Save the open flags and find free file handle table slot.
* Save the NT file handle in the table, return the table index.
*/
oflag = O_BINARY;
if (__isatty_osfhandle((long)handle))
oflag |= O_DEVICE;
if ((attr & FILE_ATTRIBUTE_READONLY) == 0)
oflag |= _O_WRITABLE; /* fstat() uses this bit */
_lock_all_handles();
if ((*handlep = _get_handle((long)handle, oflag)) == -1)
{
__IOerror(rc = ERROR_TOO_MANY_OPEN_FILES);
CloseHandle(handle);
DeleteFile(pathP);
}
else
rc = 0;
_unlock_all_handles();
return rc;
}
