agetty: beside virtual consoles support xvc and hvc device lines as well

For this approach do not use the ioctl TIOCMGET anymore as this
is for real serial lines only. But switch over to use the ioctl
KDGKBMODE as this is unique to the virtual console lines only.

Signed-off-by: Werner Fink <werner@suse.de>

1 files changed, 11 insertions, 12 deletions

diff --git a/term-utils/agetty.c b/term-utils/agetty.c
index 24c9366b2..a70683617 100644
--- a/term-utils/agetty.c
+++ b/term-utils/agetty.c
@@ -140,6 +140,7 @@ struct options {
 	int nice;			/* Run login with this priority */
 	int numspeed;			/* number of baud rates to try */
 	int clocal;			/* CLOCAL_MODE_* */
+	int kbmode;			/* Keyboard mode if virtual console */
 	speed_t speeds[MAX_SPEED];	/* baud rates to be tried */
 };
 
@@ -936,7 +937,7 @@ static void update_utmp(struct options *op)
 static void open_tty(char *tty, struct termios *tp, struct options *op)
 {
 	const pid_t pid = getpid();
-	int serial, closed = 0;
+	int closed = 0;
 
 	/* Set up new standard input, unless we are given an already opened port. */
 
@@ -1082,15 +1083,18 @@ static void open_tty(char *tty, struct termios *tp, struct options *op)
 #endif
 	/*
 	 * Detect if this is a virtual console or serial/modem line.
-	 * In case of a virtual console the ioctl TIOCMGET fails and
-	 * the error number will be set to EINVAL.
+	 * In case of a virtual console the ioctl KDGKBMODE succeeds
+	 * whereas on other lines it will fails.
 	 */
-	if (ioctl(STDIN_FILENO, TIOCMGET, &serial) < 0 && (errno == EINVAL)) {
+	if (ioctl(STDIN_FILENO, KDGKBMODE, &op->kbmode) == 0) {
 		op->flags |= F_VCONSOLE;
 		if (!op->term)
 			op->term = DEFAULT_VCTERM;
-	} else if (!op->term)
-		op->term = DEFAULT_STERM;
+	} else {
+		op->kbmode = K_RAW;
+		if (!op->term)
+			op->term = DEFAULT_STERM;
+	}
 
 	setenv("TERM", op->term, 1);
 }
@@ -1124,12 +1128,7 @@ static void termio_init(struct options *op, struct termios *tp)
 
 	if (op->flags & F_VCONSOLE) {
 #if defined(IUTF8) && defined(KDGKBMODE)
-		int mode;
-
-		/* Detect mode of current keyboard setup, e.g. for UTF-8 */
-		if (ioctl(STDIN_FILENO, KDGKBMODE, &mode) < 0)
-			mode = K_RAW;
-		switch(mode) {
+		switch(op->kbmode) {
 		case K_UNICODE:
 			setlocale(LC_CTYPE, "C.UTF-8");
 			op->flags |= F_UTF8;