[terminal] wait for vt switching to finish on quit

After changing the active vt during start up,
we get a signal when it finishes, because we're in
VT_PROCESS mode, so we don't need to explicitly block
waiting for it to finish.

During the quit path, though, we aren't in VT_PROCESS mode anymore,
won't get any signals, and still need to know that the VT switch
is finished before informing the client that the quit is
finished.

This commit forces ply_terminal_deactivate_vt to block until the
VT switch it initiates finishes.

1 files changed, 17 insertions, 1 deletions

diff --git a/src/libply-splash-core/ply-terminal.c b/src/libply-splash-core/ply-terminal.c
index 92e4a442..f71f25af 100644
--- a/src/libply-splash-core/ply-terminal.c
+++ b/src/libply-splash-core/ply-terminal.c
@@ -743,6 +743,16 @@ set_active_vt (ply_terminal_t *terminal,
 }
 
 static bool
+wait_for_vt_to_become_active (ply_terminal_t *terminal,
+                              int             vt_number)
+{
+  if (ioctl (terminal->fd, VT_WAITACTIVE, vt_number) < 0)
+    return false;
+
+  return true;
+}
+
+static bool
 deallocate_vt (ply_terminal_t *terminal,
                int             vt_number)
 {
@@ -752,7 +762,6 @@ deallocate_vt (ply_terminal_t *terminal,
   return true;
 }
 
-
 bool
 ply_terminal_activate_vt (ply_terminal_t *terminal)
 {
@@ -815,6 +824,13 @@ ply_terminal_deactivate_vt (ply_terminal_t *terminal)
           ply_trace ("Couldn't move console to initial vt: %m");
           return false;
         }
+
+      if (!wait_for_vt_to_become_active (terminal, terminal->initial_vt_number))
+        {
+          ply_trace ("Error while waiting for vt %d to become active: %m",
+                     terminal->initial_vt_number);
+          return false;
+        }
     }
   else
     {