1465 typedef struct sqlite3_vfs sqlite3_vfs;  typedef
1467 struct sqlite3_vfs {  struct
1471   sqlite3_vfs *pNext;      /* Next registered VFS */  argument
1474   int (*xOpen)(sqlite3_vfs*, sqlite3_filename zName, sqlite3_file*,  argument
1476   int (*xDelete)(sqlite3_vfs*, const char *zName, int syncDir);  argument
1477   int (*xAccess)(sqlite3_vfs*, const char *zName, int flags, int *pResOut);  argument
1478   int (*xFullPathname)(sqlite3_vfs*, const char *zName, int nOut, char *zOut);  argument
1479   void *(*xDlOpen)(sqlite3_vfs*, const char *zFilename);  argument
1480   void (*xDlError)(sqlite3_vfs*, int nByte, char *zErrMsg);  argument
1481   void (*(*xDlSym)(sqlite3_vfs*,void*, const char *zSymbol))(void);  argument
1482   void (*xDlClose)(sqlite3_vfs*, void*);  argument
1483   int (*xRandomness)(sqlite3_vfs*, int nByte, char *zOut);  argument
1484   int (*xSleep)(sqlite3_vfs*, int microseconds);  argument
1485   int (*xCurrentTime)(sqlite3_vfs*, double*);  argument
1486   int (*xGetLastError)(sqlite3_vfs*, int, char *);  argument
1491   int (*xCurrentTimeInt64)(sqlite3_vfs*, sqlite3_int64*);  argument
1496   int (*xSetSystemCall)(sqlite3_vfs*, const char *zName, sqlite3_syscall_ptr);  argument
1497   sqlite3_syscall_ptr (*xGetSystemCall)(sqlite3_vfs*, const char *zName);  argument
1498   const char *(*xNextSystemCall)(sqlite3_vfs*, const char *zName);  argument
7964 SQLITE_API sqlite3_vfs *sqlite3_vfs_find(const char *zVfsName);
7965 SQLITE_API int sqlite3_vfs_register(sqlite3_vfs*, int makeDflt);
7966 SQLITE_API int sqlite3_vfs_unregister(sqlite3_vfs*);