program--/dynio

dynamically loaded I/O drivers

dynio: Dynamic I/O Drivers

Usage

This library exposes a C header, driver.h for both producers and consumers.

Producers (aka driver implementors)

At a minimum, driver implementations require:

1. The registration function, which allocates and assigns your new driver to passed pointer:

   extern "C" void register_driver(dyn_driver**);

2. The deregistration function, which deallocates your created driver:

   extern "C" void deregister_driver(dyn_driver**);

3. An implementation of your driver providing 3 functions,

   • dyn_driver::option, which is a pointer to a function that returns a dyn_driver_option.
   • dyn_driver::read, which performs the reading portion of your driver.
   • dyn_driver::write, which performs the writing portion of your driver.

4. The source file containing the above 3 requirements to be compilable as a shared library. Drivers in dynio are loaded dynamically via dlopen.

Any internal state or functionality for your driver can be stored in the dyn_driver::internals void pointer.

See test/csv/csv.{cpp/hpp} for a producer view of how example::csv is implemented.

Consumers (aka driver users)

Users of driver implementations are intended to be C++ users, and should use driver.hpp (the C++ header), which provides a C++ abstraction of dyn_driver and the template function load_driver, which handles loading from a dynio-based shared-library driver.

See test/csv_test.cpp for a consumer view of how example::csv is loaded.

License

Distributed under the Boost Software License, Version 1.0.