native_socket 0.4.0-wip

Use unix sockets via file descriptors.

0.4.0-wip

• New high-level Dart API: UnixSocket class with connect(), bind(), accept(), pair(), send(), receive(), sendTo(), receiveFrom(), split()
• Address types: Address.file() and Address.abstract() for filesystem-path and abstract namespace addressing
• SocketType enum: SocketType.stream (connection-oriented) and SocketType.datagram (message-boundary-preserving)
• NativeBuffer: heap-backed and native (off-heap) buffers with zero-copy slicing — inspired by Java NIO ByteBuffer and Netty ByteBuf
• Server sockets: full bind/listen/accept workflow
• SCM_RIGHTS fd passing: send() with fd: argument and receiveFd()
• Socket options: setSendBufferSize, getSendBufferSize, setReceiveBufferSize, getReceiveBufferSize, setLinger
• Split halves: SocketReader / SocketWriter for concurrent I/O
• Path cleanup: unlink() and closeAndUnlink() for Unix socket files
• Expanded C API: create_socket, bind_socket, bind_socket_abstract, listen_socket, accept_socket, connect_unix_socket, connect_unix_socket_abstract, send_to, send_to_abstract, recv_from, set_so_sndbuf/rcvbuf/linger, get_so_sndbuf/rcvbuf, unlink_socket_path, socket_has_data
• Migrate to package:hooks 2.0.0, package:code_assets 1.0.0+, package:native_toolchain_c 0.19.0+
• Programmatic package:ffigen config (tool/generate_bindings.dart) replaces YAML ffigen: block in pubspec.yaml
• 55 tests covering all new APIs
• Fix: recv_bytes return type corrected to ssize_t
• Fix: receive() no longer returns view into freed calloc memory (use-after-free)
• Fix: pair() uses correct pointer width (Int not IntPtr) on 64-bit
• Fix: EAGAIN retry loop in receive() and receiveFrom()
• Remove dead lib/src/socket.dart (old UnixSocket class)

0.3.0

• Initial hooks support

0.2.0

• Add support for checking if sockets have data available

0.1.0

• Initial version.