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Returning negative integer constants from every function call for callers to map to documented error names.
Distinct from Error Code to Exception Mapping: Distinct from Error Code to Exception Mapping: uses negative integer returns directly, not exception translation.
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libusb is a cross-platform user-space library that provides a consistent C API for discovering, configuring, and communicating with USB devices from applications. It abstracts operating-system-specific USB driver details behind a single interface that works on Linux, macOS, Windows, and other platforms, enabling developers to write portable USB code without platform-specific knowledge. The library supports both synchronous and asynchronous I/O models for USB transfers. Synchronous operations block the calling thread until a transfer completes, offering a straightforward sequential programming
Returns negative integer error codes from all functions, enabling callers to diagnose failures without exceptions.