668       xCheckReservedLock: function(pFile,pOut){  argument
678         const f = __openFiles[pFile];
682       xClose: function(pFile){  argument
685         const f = __openFiles[pFile];
687           delete __openFiles[pFile];
688           rc = opRun('xClose', pFile);
694       xDeviceCharacteristics: function(pFile){  argument
698       xFileControl: function(pFile, opId, pArg){  argument
701               ? opRun('xSync', pFile, 0)
706       xFileSize: function(pFile,pSz64){  argument
708         const rc = opRun('xFileSize', pFile);
716       xLock: function(pFile,lockType){  argument
718         const f = __openFiles[pFile];
721           rc = opRun('xLock', pFile, lockType);
729       xRead: function(pFile,pDest,n,offset64){  argument
731         const f = __openFiles[pFile];
734           rc = opRun('xRead',pFile, n, Number(offset64));
750       xSync: function(pFile,flags){  argument
754       xTruncate: function(pFile,sz64){  argument
756         const rc = opRun('xTruncate', pFile, Number(sz64));
760       xUnlock: function(pFile,lockType){  argument
762         const f = __openFiles[pFile];
766           rc = opRun('xUnlock', pFile, lockType);
772       xWrite: function(pFile,pSrc,n,offset64){  argument
774         const f = __openFiles[pFile];
778           rc = opRun('xWrite', pFile, n, Number(offset64));
836       xOpen: function f(pVfs, zName, pFile, flags, pOutFlags){
844         fh.fid = pFile;
848         const rc = opRun('xOpen', pFile, zName, flags);
855           __openFiles[pFile] = fh;
857           fh.sq3File = new sqlite3_file(pFile);