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| author | Kay Sievers <kay.sievers@vrfy.org> | 2010-12-01 18:51:05 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-12-17 01:15:34 +0100 |
| commit | fbc92a3455577ab17615cbcb91826399061bd789 (patch) | |
| tree | 0f47703d9d3b40969e007a6d27a1b603cdff43da /Documentation | |
| parent | drivers: serial: apbuart: Handle OF failures gracefully (diff) | |
| download | linux-fbc92a3455577ab17615cbcb91826399061bd789.tar.xz linux-fbc92a3455577ab17615cbcb91826399061bd789.zip | |
tty: add 'active' sysfs attribute to tty0 and console device
tty: add 'active' sysfs attribute to tty0 and console device
Userspace can query the actual virtual console, and the configured
console devices behind /dev/tt0 and /dev/console.
The last entry in the list of devices is the active device, analog
to the console= kernel command line option.
The attribute supports poll(), which is raised when the virtual
console is changed or /dev/console is reconfigured.
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
index 0000000..b138b66
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-tty | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-tty b/Documentation/ABI/testing/sysfs-tty new file mode 100644 index 000000000000..b138b663bf54 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-tty @@ -0,0 +1,19 @@ +What: /sys/class/tty/console/active +Date: Nov 2010 +Contact: Kay Sievers <kay.sievers@vrfy.org> +Description: + Shows the list of currently configured + console devices, like 'tty1 ttyS0'. + The last entry in the file is the active + device connected to /dev/console. + The file supports poll() to detect virtual + console switches. + +What: /sys/class/tty/tty0/active +Date: Nov 2010 +Contact: Kay Sievers <kay.sievers@vrfy.org> +Description: + Shows the currently active virtual console + device, like 'tty1'. + The file supports poll() to detect virtual + console switches. |