1425 typedef struct sqlite3_vfs sqlite3_vfs;  typedef
1427 struct sqlite3_vfs {  struct
1431   sqlite3_vfs *pNext;      /* Next registered VFS */  argument
1434   int (*xOpen)(sqlite3_vfs*, const char *zName, sqlite3_file*,  argument
1436   int (*xDelete)(sqlite3_vfs*, const char *zName, int syncDir);  argument
1437   int (*xAccess)(sqlite3_vfs*, const char *zName, int flags, int *pResOut);  argument
1438   int (*xFullPathname)(sqlite3_vfs*, const char *zName, int nOut, char *zOut);  argument
1439   void *(*xDlOpen)(sqlite3_vfs*, const char *zFilename);  argument
1440   void (*xDlError)(sqlite3_vfs*, int nByte, char *zErrMsg);  argument
1441   void (*(*xDlSym)(sqlite3_vfs*,void*, const char *zSymbol))(void);  argument
1442   void (*xDlClose)(sqlite3_vfs*, void*);  argument
1443   int (*xRandomness)(sqlite3_vfs*, int nByte, char *zOut);  argument
1444   int (*xSleep)(sqlite3_vfs*, int microseconds);  argument
1445   int (*xCurrentTime)(sqlite3_vfs*, double*);  argument
1446   int (*xGetLastError)(sqlite3_vfs*, int, char *);  argument
1451   int (*xCurrentTimeInt64)(sqlite3_vfs*, sqlite3_int64*);  argument
1456   int (*xSetSystemCall)(sqlite3_vfs*, const char *zName, sqlite3_syscall_ptr);  argument
1457   sqlite3_syscall_ptr (*xGetSystemCall)(sqlite3_vfs*, const char *zName);  argument
1458   const char *(*xNextSystemCall)(sqlite3_vfs*, const char *zName);  argument