--- nono/lib/autofd.h	2026/04/29 17:04:48	1.1.1.1
+++ nono/lib/autofd.h	2026/04/29 17:05:57	1.1.1.5
@@ -1,9 +1,24 @@
+/*
+ * Copyright (C) 2020 Tetsuya Isaki
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
 //
-// nono
-// Copyright (C) 2020 nono project
-// Licensed under nono-license.txt
+// autofd
 //
 
+#pragma once
+
 #include <unistd.h>
 
 // 自動変数みたいな生存期間を持つディスクリプタ
@@ -18,8 +33,7 @@ class autofd
 	}
 
 	~autofd() {
-		if (fd >= 0)
-			close(fd);
+		Close();
 	}
 
 	autofd& operator=(int fd_) {
@@ -33,13 +47,18 @@ class autofd
 	// 明示的にクローズする
 	int Close() {
 		int rv = 0;
-		if (fd >= 0) {
+		if (Valid()) {
 			rv = close(fd);
 			fd = -1;
 		}
 		return rv;
 	}
 
- public:
+	// fd が有効なら true を返す
+	bool Valid() const {
+		return (fd >= 0);
+	}
+
+ private:
 	int fd;
 };