system/FileDescriptor: move to io/

src/io/UniqueFileDescriptor.hxx

@@ -0,0 +1,94 @@
+/*
+ * Copyright 2012-2018 Max Kellermann <max.kellermann@gmail.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+ * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef UNIQUE_FILE_DESCRIPTOR_HXX
+#define UNIQUE_FILE_DESCRIPTOR_HXX
+
+#include "FileDescriptor.hxx"
+
+#include <cassert>
+#include <utility>
+
+/**
+ * An OO wrapper for a UNIX file descriptor.
+ */
+class UniqueFileDescriptor : public FileDescriptor {
+public:
+	UniqueFileDescriptor() noexcept
+		:FileDescriptor(FileDescriptor::Undefined()) {}
+
+	explicit UniqueFileDescriptor(int _fd) noexcept
+		:FileDescriptor(_fd) {}
+
+	explicit UniqueFileDescriptor(FileDescriptor _fd) noexcept
+		:FileDescriptor(_fd) {}
+
+	UniqueFileDescriptor(const UniqueFileDescriptor &) = delete;
+
+	UniqueFileDescriptor(UniqueFileDescriptor &&other) noexcept
+		:FileDescriptor(other.Steal()) {}
+
+	~UniqueFileDescriptor() noexcept {
+		Close();
+	}
+
+	UniqueFileDescriptor &operator=(UniqueFileDescriptor &&other) noexcept {
+		using std::swap;
+		swap(fd, other.fd);
+		return *this;
+	}
+
+protected:
+	void Set(int _fd) noexcept {
+		assert(!IsDefined());
+		assert(_fd >= 0);
+
+		FileDescriptor::Set(_fd);
+	}
+
+public:
+#ifndef _WIN32
+	static bool CreatePipe(UniqueFileDescriptor &r, UniqueFileDescriptor &w) noexcept {
+		return FileDescriptor::CreatePipe(r, w);
+	}
+
+	static bool CreatePipeNonBlock(UniqueFileDescriptor &r,
+				       UniqueFileDescriptor &w) noexcept {
+		return FileDescriptor::CreatePipeNonBlock(r, w);
+	}
+
+	static bool CreatePipe(FileDescriptor &r, FileDescriptor &w) noexcept;
+#endif
+
+	bool Close() noexcept {
+		return IsDefined() && FileDescriptor::Close();
+	}
+};
+
+#endif