Function ly_ctx_new 

pub unsafe extern "C" fn ly_ctx_new(
    search_dir: *const c_char,
    options: u32,
    new_ctx: *mut *mut ly_ctx,
) -> Type

@brief Create libyang context.

Context is used to hold all information about schemas. Usually, the application is supposed to work with a single context in which libyang is holding all schemas (and other internal information) according to which the data trees will be processed and validated. So, the schema trees are tightly connected with the specific context and they are held by the context internally

• caller does not need to keep pointers to the schemas returned by ::lys_parse(), context knows about them. The data trees created with \b lyd_parse_() are still connected with the specific context, but they are not internally held by the context. The data tree just points and lean on some data held by the context (schema tree, string dictionary, etc.). Therefore, in case of data trees, caller is supposed to keep pointers returned by the \b lyd_parse_() functions and manage the data tree on its own. This also affects the number of instances of both tree types. While you can have only one instance of specific schema connected with a single context, number of data tree instances is not connected.

@param[in] search_dir Directory (or directories) where libyang will search for the imported or included modules and submodules. If no such directory is available, NULL is accepted. Several directories can be specified, delimited by colon “:” (on Windows, use semicolon “;” instead). @param[in] options Context options, see @ref contextoptions. @param[out] new_ctx Pointer to the created libyang context if LY_SUCCESS returned. @return LY_ERR return value.