SQLITE_READONLY_CANTINIT

The SQLITE_READONLY_CANTINIT result code originates in the xShmMap method of a VFS to indicate that the shared memory region used by WAL mode exists buts its content is unreliable and unusable by the current process since the current process does not have write permission on the shared memory region. (The shared memory region for WAL mode is normally a file with a "-wal" suffix that is mmapped into the process space. If the current process does not have write permission on that file, then it cannot write into shared memory.) Higher level logic within SQLite will normally intercept the error code and create a temporary in-memory shared memory region so that the current process can at least read the content of the database. This result code should not reach the application interface layer.