On 02/24/2014 03:58 PM, David Herrmann wrote:
> Hi
>
> On Mon, Feb 24, 2014 at 3:50 PM, Hannes Reinecke <h...@suse.de> wrote:
>> The 'active' sysfs attribute should refer to the currently
>> active tty devices the console is running on, not the currently
>> active console.
>> The console structure doesn't refer to any device in sysfs,
>> only the tty the console is running on has.
>> So we need to print out the tty names in 'active', not
>> the console names.
>> But we need to take care for the virtual console to always display
>> 'tty0' so as not to break existing programs.
>>
>> Cc: Lennart Poettering <lenn...@poettering.net>
>> Cc: Kay Sievers <k...@vrfy.org>
>> Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
>> Cc: Jiri Slaby <jsl...@suse.cz>
>> Signed-off-by: Werner Fink <wer...@suse.de>
>> Signed-off-by: Hannes Reinecke <h...@suse.de>
>> ---
>> drivers/tty/tty_io.c | 24 ++++++++++++++++++------
>> 1 file changed, 18 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
>> index c74a00a..96eb462 100644
>> --- a/drivers/tty/tty_io.c
>> +++ b/drivers/tty/tty_io.c
>> @@ -1271,12 +1271,13 @@ static void pty_line_name(struct tty_driver *driver,
>> int index, char *p)
>> *
>> * Locking: None
>> */
>> -static void tty_line_name(struct tty_driver *driver, int index, char *p)
>> +static ssize_t tty_line_name(struct tty_driver *driver, int index, char *p)
>> {
>> if (driver->flags & TTY_DRIVER_UNNUMBERED_NODE)
>> - strcpy(p, driver->name);
>> + return sprintf(p, "%s", driver->name);
>> else
>> - sprintf(p, "%s%d", driver->name, index + driver->name_base);
>> + return sprintf(p, "%s%d", driver->name,
>> + index + driver->name_base);
>> }
>>
>> /**
>> @@ -3545,9 +3546,20 @@ static ssize_t show_cons_active(struct device *dev,
>> if (i >= ARRAY_SIZE(cs))
>> break;
>> }
>> - while (i--)
>> - count += sprintf(buf + count, "%s%d%c",
>> - cs[i]->name, cs[i]->index, i ? ' ':'\n');
>> + while (i--) {
>> + struct tty_driver *driver;
>> + const char *name = cs[i]->name;
>> + int index = cs[i]->index;
>> +
>> + driver = cs[i]->device(cs[i], &index);
>> + /* Some programs rely on 'tty0' for console */
>> + if (driver && (index > 0 || driver->major != TTY_MAJOR)) {
>
> As Ray mentioned in the previous discussion, this has to be
> cs[i]->index instead of "index" as ->device() changes the parameter.
> See drivers/tty/vt/vt.c vt_console_device().
>
Positive?
I thought this was precisely the problem, ->device() changing the
index '0' into something non-zero.
The reports we had were that the line 'tty0' changed into 'tty1'.
Hence ->device() converted cs[i]->index (which is '0') into index
(which is '1').
Hence the check would be correct, wouldn't it?
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
h...@suse.de +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)
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