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| author |   Ari Entlich <atrigent@ccs.neu.edu> | 2010-02-19 09:37:55 -0500 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@suse.de> | 2010-03-02 14:43:23 -0800 |
| commit | eec9fe7d1ab4a0dfac4cb43047a7657fffd0002f (patch) | |
| tree | ba6b4a517aaacbfde6e5496d02f97e6c9b491c2e /include/linux/vt.h | |
| parent | tty: Keep the default buffering to sub-page units (diff) | |
| download | linux-dev-eec9fe7d1ab4a0dfac4cb43047a7657fffd0002f.tar.xz linux-dev-eec9fe7d1ab4a0dfac4cb43047a7657fffd0002f.zip | |
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-<number of a text vt>, sshing in and
doing chvt <number of a text vt>, 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 <atrigent@ccs.neu.edu>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include/linux/vt.h')
| -rw-r--r-- | include/linux/vt.h | 3 |
1 files changed, 2 insertions, 1 deletions
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 */ |