From eec9fe7d1ab4a0dfac4cb43047a7657fffd0002f Mon Sep 17 00:00:00 2001 From: Ari Entlich Date: Fri, 19 Feb 2010 09:37:55 -0500 Subject: tty: Add a new VT mode which is like VT_PROCESS but doesn't require a VT_RELDISP ioctl call This new VT mode (VT_PROCESS_AUTO) does everything that VT_PROCESS does except that it doesn't wait for a VT_RELDISP ioctl before switching away from a VT with that mode. If the X server eventually uses this new mode, debugging and crash recovery should become easier. This is because even when currently in the VT of a frozen X server it would still be possible to switch out by doing SysRq-r and then CTRL-, sshing in and doing chvt , or any other method of VT switching. The general concensus on #xorg-devel seems to be that it should be safe to use this with X now that we have KMS. This also moves the VT_ACKACQ define to a more appropriate place, for clarity's sake. Signed-off-by: Ari Entlich Acked-by: Alan Cox Signed-off-by: Greg Kroah-Hartman --- include/linux/vt.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'include/linux/vt.h') diff --git a/include/linux/vt.h b/include/linux/vt.h index d5dd0bc408fd..778b7b2a47d4 100644 --- a/include/linux/vt.h +++ b/include/linux/vt.h @@ -27,7 +27,7 @@ struct vt_mode { #define VT_SETMODE 0x5602 /* set mode of active vt */ #define VT_AUTO 0x00 /* auto vt switching */ #define VT_PROCESS 0x01 /* process controls switching */ -#define VT_ACKACQ 0x02 /* acknowledge switch */ +#define VT_PROCESS_AUTO 0x02 /* process is notified of switching */ struct vt_stat { unsigned short v_active; /* active vt */ @@ -38,6 +38,7 @@ struct vt_stat { #define VT_SENDSIG 0x5604 /* signal to send to bitmask of vts */ #define VT_RELDISP 0x5605 /* release display */ +#define VT_ACKACQ 0x02 /* acknowledge switch */ #define VT_ACTIVATE 0x5606 /* make vt active */ #define VT_WAITACTIVE 0x5607 /* wait for vt active */ -- cgit v1.2.3-59-g8ed1b