Extract system-specifics from Socket (#10706)

src/crystal/system/socket.cr

@@ -0,0 +1,83 @@
+module Crystal::System::Socket
+  # Creates a file descriptor / socket handle
+  # private def create_handle(family, type, protocol, blocking) : Handle
+
+  # Initializes a file descriptor / socket handle for use with Crystal Socket
+  # private def initialize_handle(fd)
+
+  # private def system_connect(addr, timeout = nil)
+
+  # Tries to bind the socket to a local address.
+  # Yields an `Socket::BindError` if the binding failed.
+  # private def system_bind(addr, addrstr)
+
+  # private def system_listen(backlog)
+
+  # private def system_accept
+
+  # private def system_send(bytes : Bytes) : Int32
+
+  # private def system_send_to(bytes : Bytes, addr : ::Socket::Address)
+
+  # private def system_receive(bytes)
+
+  # private def system_close_read
+
+  # private def system_close_write
+
+  # private def system_reuse_port?
+
+  # private def system_reuse_port=(val : Bool)
+
+  # private def system_linger
+
+  # private def system_linger=(val)
+
+  # private def system_getsockopt(fd, optname, optval, level = LibC::SOL_SOCKET)
+
+  # private def system_setsockopt(fd, optname, optval, level = LibC::SOL_SOCKET)
+
+  # private def system_blocking?
+
+  # private def system_blocking=(value)
+
+  # private def system_tty?
+
+  # private def system_close_on_exec?
+
+  # private def system_close_on_exec=(arg : Bool)
+
+  # def self.fcntl(fd, cmd, arg = 0)
+
+  # private def unbuffered_read(slice : Bytes)
+
+  # private def unbuffered_write(slice : Bytes)
+
+  # private def system_close
+
+  # IPSocket:
+
+  # private def system_local_address
+
+  # private def system_remote_address
+
+  # TCPSocket:
+
+  # private def system_tcp_keepalive_idle
+
+  # private def system_tcp_keepalive_idle=(val : Int)
+
+  # private def system_tcp_keepalive_interval
+
+  # private def system_tcp_keepalive_interval=(val : Int)
+
+  # private def system_tcp_keepalive_count
+
+  # private def system_tcp_keepalive_count=(val : Int)
+end
+
+{% if flag?(:unix) %}
+  require "./unix/socket"
+{% else %}
+  {% raise "No Crystal::System::Socket implementation available" %}
+{% end %}