[mammoth] Move port server operations to their own class.

lib/mammoth/include/mammoth/port_server.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <glacier/status/error_or.h>
+#include <ztypes.h>
+
+class PortServer {
+ public:
+  static glcr::ErrorOr<PortServer> Create();
+  static PortServer AdoptCap(z_cap_t cap);
+
+  glcr::ErrorCode CreateClient(z_cap_t* new_port);
+
+  glcr::ErrorCode RecvCap(uint64_t* num_bytes, char* msg, uint64_t* cap);
+  glcr::ErrorCode PollForIntCap(uint64_t* msg, uint64_t* cap);
+
+ private:
+  z_cap_t port_cap_;
+
+  PortServer(z_cap_t cap);
+};