upload codebase

Signed-off-by: Double Sine <xiao_ai_yu@live.cn>

common/resource_traits/unix_os/file_descriptor.hpp

@@ -0,0 +1,21 @@
+#pragma once
+#include <unistd.h>
+
+namespace nkg::resource_traits::unix_os {
+
+    struct file_descriptor {
+        using handle_t = int;
+
+        static constexpr handle_t invalid_value = -1;
+
+        [[nodiscard]]
+        static bool is_valid(const handle_t& handle) noexcept {
+            return handle != invalid_value;
+        }
+
+        static void release(const handle_t& handle) {
+            close(handle);
+        }
+    };
+
+}

common/resource_traits/unix_os/map_view.hpp

@@ -0,0 +1,19 @@
+#pragma once
+#include <errno.h>
+#include <unistd.h>
+#include <sys/mman.h>
+
+namespace nkg::resource_traits::unix_os {
+
+    struct map_view {
+        using handle_t = void*;
+
+        static inline const handle_t invalid_value = MAP_FAILED;
+
+        [[nodiscard]]
+        static bool is_valid(const handle_t& handle) noexcept {
+            return handle != invalid_value;
+        }
+    };
+
+}