1 files changed, 49 insertions, 0 deletions
diff --git a/include/libcamera/base/shared_fd.h b/include/libcamera/base/shared_fd.h
new file mode 100644
index 00000000..a786885c
--- /dev/null
+++ b/include/libcamera/base/shared_fd.h
@@ -0,0 +1,49 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * shared_fd.h - File descriptor wrapper with shared ownership
+ */
+
+#pragma once
+
+#include <memory>
+
+namespace libcamera {
+
+class UniqueFD;
+
+class SharedFD final
+{
+public:
+	explicit SharedFD(const int &fd = -1);
+	explicit SharedFD(int &&fd);
+	explicit SharedFD(UniqueFD fd);
+	SharedFD(const SharedFD &other);
+	SharedFD(SharedFD &&other);
+	~SharedFD();
+
+	SharedFD &operator=(const SharedFD &other);
+	SharedFD &operator=(SharedFD &&other);
+
+	bool isValid() const { return fd_ != nullptr; }
+	int fd() const { return fd_ ? fd_->fd() : -1; }
+	UniqueFD dup() const;
+
+private:
+	class Descriptor
+	{
+	public:
+		Descriptor(int fd, bool duplicate);
+		~Descriptor();
+
+		int fd() const { return fd_; }
+
+	private:
+		int fd_;
+	};
+
+	std::shared_ptr<Descriptor> fd_;
+};
+
+} /* namespace libcamera */