23591 typedef struct unixFile unixFile;  typedef
23592 struct unixFile {  struct
23594   sqlite3_vfs *pVfs;                  /* The VFS that created this unixFile */  argument
23595   unixInodeInfo *pInode;              /* Info about locks on this inode */
23596   int h;                              /* The file descriptor */
23597   unsigned char eFileLock;            /* The type of lock held on this fd */
23598   unsigned short int ctrlFlags;       /* Behavioral bits.  UNIXFILE_* flags */
23599   int lastErrno;                      /* The unix errno from last I/O error */
23600   void *lockingContext;               /* Locking style specific state */
23601   UnixUnusedFd *pUnused;              /* Pre-allocated UnixUnusedFd */
23602   const char *zPath;                  /* Name of the file */
23603   unixShm *pShm;                      /* Shared memory segment information */
23604   int szChunk;                        /* Configured by FCNTL_CHUNK_SIZE */
23606   int nFetchOut;                      /* Number of outstanding xFetch refs */
23607   sqlite3_int64 mmapSize;             /* Usable size of mapping at pMapRegion */
23608   sqlite3_int64 mmapSizeActual;       /* Actual size of mapping at pMapRegion */
23609   sqlite3_int64 mmapSizeMax;          /* Configured FCNTL_MMAP_SIZE value */
23610   void *pMapRegion;                   /* Memory mapped region */
23613   int sectorSize;                     /* Device sector size */
23614   int deviceCharacteristics;          /* Precomputed device characteristics */
23617   int openFlags;                      /* The flags specified at open() */
23620   unsigned fsFlags;                   /* cached details from statfs() */
23623   struct vxworksFileId *pId;          /* Unique file ID */
23654 ** Allowed values for the unixFile.ctrlFlags bitmask:  argument