--- nono/host/comdriver_stdio.cpp	2026/04/29 17:05:18	1.1.1.2
+++ nono/host/comdriver_stdio.cpp	2026/04/29 17:05:47	1.1.1.3
@@ -13,25 +13,38 @@
 
 // コンストラクタ
 COMDriverStdio::COMDriverStdio(HostDevice *hostdev_)
-	: inherited(hostdev_, "Stdio")
+	: inherited(hostdev_, "stdio")
 {
-	// 現在の端末属性を取得
-	tcgetattr(STDIN_FILENO, &oldtc);
 }
 
 // デストラクタ
 COMDriverStdio::~COMDriverStdio()
 {
+	hostdev->DelOuter(STDIN_FILENO);
+
 	// 端末属性を元に戻す
-	tcsetattr(STDIN_FILENO, TCSANOW, &oldtc);
+	if (tc_changed) {
+		tcsetattr(STDIN_FILENO, TCSANOW, &oldtc);
+	}
+
+	stdio_occupied = false;
 }
 
 // ドライバ初期化
 bool
-COMDriverStdio::InitDriver()
+COMDriverStdio::InitDriver(bool startup)
 {
 	struct termios tc;
 
+	if (stdio_occupied) {
+		errmsg = "'stdio' is already in use by another hostcom-driver";
+		putmsg(1, "%s", errmsg.c_str());
+		return false;
+	}
+
+	// 現在の端末属性を取得
+	tcgetattr(STDIN_FILENO, &oldtc);
+
 	// 端末の設定を変更
 	tc = oldtc;
 
@@ -46,15 +59,19 @@ COMDriverStdio::InitDriver()
 	tc.c_cc[VMIN] = 1;
 
 	if (tcsetattr(STDIN_FILENO, TCSANOW, &tc) < 0) {
-		putmsg(0, "tcsetattr: %s", strerror(errno));
+		errmsg = string_format("tcsetattr: %s", strerror(errno));
+		putmsg(1, "%s", errmsg.c_str());
 		return false;
 	}
+	tc_changed = true;
 
 	if (hostdev->AddOuter(STDIN_FILENO) < 0) {
-		putmsg(0, "AddOuter: %s", strerror(errno));
+		errmsg = string_format("AddOuter: %s", strerror(errno));
+		putmsg(1, "%s", errmsg.c_str());
 		return false;
 	}
 
+	stdio_occupied = true;
 	return true;
 }
 
@@ -94,3 +111,6 @@ COMDriverStdio::Read()
 	}
 	return buf[0];
 }
+
+// stdio を使えるのは同時に1人だけに限定する。
+/*static*/ bool COMDriverStdio::stdio_occupied = false;