[Mammoth] Move ipc calls to separate folder mammoth.

lib/mammoth/ipc/channel.h

@@ -0,0 +1,47 @@
+#pragma once
+
+#include <glacier/status/error.h>
+#include <stdint.h>
+#include <zcall.h>
+
+class Channel {
+ public:
+  Channel() {}
+  void adopt_cap(uint64_t id);
+  z_cap_t release_cap();
+  z_cap_t cap();
+
+  z_err_t WriteStr(const char* msg);
+  z_err_t ReadStr(char* buffer, uint64_t* size);
+
+  template <typename T>
+  z_err_t WriteStruct(T*);
+
+  template <typename T>
+  z_err_t ReadStructAndCap(T*, uint64_t*);
+
+  // FIXME: Close channel here.
+  ~Channel() {}
+
+ private:
+  z_cap_t chan_cap_ = 0;
+};
+
+uint64_t CreateChannels(Channel& c1, Channel& c2);
+
+template <typename T>
+z_err_t Channel::WriteStruct(T* obj) {
+  return ZChannelSend(chan_cap_, sizeof(T), obj, 0, nullptr);
+}
+
+template <typename T>
+z_err_t Channel::ReadStructAndCap(T* obj, uint64_t* cap) {
+  uint64_t num_bytes = sizeof(T);
+  uint64_t num_caps = 1;
+  RET_ERR(ZChannelRecv(chan_cap_, &num_bytes, obj, &num_caps, cap));
+
+  if (num_caps != 1 || num_bytes != sizeof(T)) {
+    return glcr::FAILED_PRECONDITION;
+  }
+  return glcr::OK;
+}