NBD Network Block Device is a protocol for accessing Block Devices over a Network. This is the NBD client library in userspace, a simple library for writing NBD clients. The key features are: * Synchronous and asynchronous APIs, both for ease of use and for writing non-blocking, multithreaded clients. * High performance. * Minimal dependencies for the basic library. * Well-documented, stable API. * Bindings in several programming languages.