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| author |   Manuel Schölling <manuel.schoelling@gmx.de> | 2017-01-13 21:07:57 +0100 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-01-25 11:54:02 +0100 |
| commit | aabd31c421ddc730edf6d89c4ed3885e4fca5e30 (patch) | |
| tree | 793c32e81be9aa92e693f0ff0fe9cb465a15886f /drivers/video/console/Kconfig | |
| parent | console: Add callback to flush scrollback buffer to consw struct (diff) | |
| download | wireguard-linux-aabd31c421ddc730edf6d89c4ed3885e4fca5e30.tar.xz wireguard-linux-aabd31c421ddc730edf6d89c4ed3885e4fca5e30.zip | |
console: Add persistent scrollback buffers for all VGA consoles
Add a scrollback buffers for each VGA console. The benefit is that
the scrollback history is not flushed when switching between consoles
but is persistent.
The buffers are allocated on demand when a new console is opened.
This breaks tools like clear_console that rely on flushing the
scrollback history by switching back and forth between consoles
which is why this feature is disabled by default.
Use the escape sequence \e[3J instead for flushing the buffer.
Signed-off-by: Manuel Schölling <manuel.schoelling@gmx.de>
Reviewed-by: Andrey Utkin <andrey_utkin@fastmail.com>
Tested-by: Andrey Utkin <andrey_utkin@fastmail.com>
Tested-by: Adam Borowski <kilobyte@angband.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/video/console/Kconfig')
| -rw-r--r-- | drivers/video/console/Kconfig | 25 |
1 files changed, 22 insertions, 3 deletions
diff --git a/drivers/video/console/Kconfig b/drivers/video/console/Kconfig index c3f1fb9ee820..f500e58f7636 100644 --- a/drivers/video/console/Kconfig +++ b/drivers/video/console/Kconfig @@ -43,9 +43,28 @@ config VGACON_SOFT_SCROLLBACK_SIZE range 1 1024 default "64" help - Enter the amount of System RAM to allocate for the scrollback - buffer. Each 64KB will give you approximately 16 80x25 - screenfuls of scrollback buffer + Enter the amount of System RAM to allocate for scrollback + buffers of VGA consoles. Each 64KB will give you approximately + 16 80x25 screenfuls of scrollback buffer. + +config VGACON_SOFT_SCROLLBACK_PERSISTENT + bool "Persistent Scrollback History for each console" + depends on VGACON_SOFT_SCROLLBACK + default n + help + Say Y here if the scrollback history should persist when switching + between consoles. Otherwise, the scrollback history will be flushed + each time the console is switched. + + This feature might break your tool of choice to flush the scrollback + buffer, e.g. clear(1) will work fine but Debian's clear_console(1) + will be broken, which might cause security issues. + You can use the escape sequence \e[3J instead if this feature is + activated. + + Note that a buffer of VGACON_SOFT_SCROLLBACK_SIZE is taken for each + created tty device. + So if you use a RAM-constrained system, say N here. config MDA_CONSOLE depends on !M68K && !PARISC && ISA |