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From cabcd21c17ca98e517a3eea7c9d5ce269445e3e0 Mon Sep 17 00:00:00 2001
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From: Ray Strode <rstrode@redhat.com>
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Date: Fri, 31 Aug 2018 15:46:55 -0400
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Subject: [PATCH 25/51] session-worker: clear VT before jumping to it
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If we're going to jump to a new VT we should make sure it's free
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of residual console text. That way if there's flicker the user
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will be less likely to notice it.
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This commit sends a clear screen escape sequence to the tty
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before jumping to it.
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---
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daemon/gdm-session-worker.c | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/daemon/gdm-session-worker.c b/daemon/gdm-session-worker.c
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index 391969d96..7ed2789da 100644
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--- a/daemon/gdm-session-worker.c
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+++ b/daemon/gdm-session-worker.c
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@@ -943,60 +943,67 @@ fix_terminal_vt_mode (GdmSessionWorker *worker,
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}
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/* VT is in the anti-social state of VT_AUTO + KD_GRAPHICS,
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* fix it.
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*/
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succeeded = handle_terminal_vt_switches (worker, tty_fd);
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mode_fixed = TRUE;
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out:
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if (!succeeded) {
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g_error ("GdmSessionWorker: couldn't set up terminal, aborting...");
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return;
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}
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g_debug ("GdmSessionWorker: VT mode did %sneed to be fixed",
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mode_fixed? "" : "not ");
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}
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static void
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jump_to_vt (GdmSessionWorker *worker,
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int vt_number)
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{
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int fd;
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int active_vt_tty_fd;
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int active_vt = -1;
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struct vt_stat vt_state = { 0 };
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g_debug ("GdmSessionWorker: jumping to VT %d", vt_number);
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active_vt_tty_fd = open ("/dev/tty0", O_RDWR | O_NOCTTY);
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if (worker->priv->session_tty_fd != -1) {
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+ static const char *clear_screen_escape_sequence = "\33[H\33[2J";
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+
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+ /* let's make sure the new VT is clear */
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+ write (worker->priv->session_tty_fd,
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+ clear_screen_escape_sequence,
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+ sizeof (clear_screen_escape_sequence));
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+
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fd = worker->priv->session_tty_fd;
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g_debug ("GdmSessionWorker: first setting graphics mode to prevent flicker");
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if (ioctl (fd, KDSETMODE, KD_GRAPHICS) < 0) {
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g_debug ("GdmSessionWorker: couldn't set graphics mode: %m");
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}
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/* It's possible that the current VT was left in a broken
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* combination of states (KD_GRAPHICS with VT_AUTO), that
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* can't be switched away from. This call makes sure things
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* are set in a way that VT_ACTIVATE should work and
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* VT_WAITACTIVE shouldn't hang.
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*/
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fix_terminal_vt_mode (worker, active_vt_tty_fd);
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} else {
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fd = active_vt_tty_fd;
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}
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handle_terminal_vt_switches (worker, fd);
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if (ioctl (fd, VT_GETSTATE, &vt_state) < 0) {
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g_debug ("GdmSessionWorker: couldn't get current VT: %m");
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} else {
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active_vt = vt_state.v_active;
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}
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if (active_vt != vt_number) {
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if (ioctl (fd, VT_ACTIVATE, vt_number) < 0) {
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g_debug ("GdmSessionWorker: couldn't initiate jump to VT %d: %m",
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vt_number);
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--
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2.27.0
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