[pacman-dev] -Qi output corrupted when using screen

[Xavier Chantry]

On Sun, Feb 28, 2010 at 10:24 AM, Roman Kyrylych
<roman.kyrylych at gmail.com> wrote:
> On Sat, Feb 27, 2010 at 23:35, Xavier Chantry <chantry.xavier at gmail.com> wrote:
>>
>> Well Jeff and I are still waiting for some feedback on our original questions..
>
> Sorry for the delay.
>
> On Fri, Feb 26, 2010 at 22:39, Jeff <jeff at kcaccess.com> wrote:
>> Here is a simple POC to see what the output is. It calls ioctl twice
>> with a 10 second delay for changing window sizes between calls. It
>> doesn't use TIOCGSIZW as that is not defined in Linux, but rather BSD
>> and maybe some others. I am not familiar with vps or linode.
>
> So, I get
>  rows:    0
>  columns: 0
>  rows:    0
>  columns: 0
> instead of expected
>  rows:    24
>  columns: 80
>  rows:    36
>  columns: 139
>

So TIOCGWINSZ is defined, the ioctl call does not return any error,
but it still just returns 0. Weird.
By the way, how did you figure out the expected values ?

In git master, after the commit I linked above, with your bogus ioctl
call, or piping to cat, getcols() returns 0, and the callers treat
that as no linewrap.
So that could be a problem for you. I wonder if we should keep the
fallback to 80 columns in this bogus situation.

Or maybe we could fallback to that old unused code :
- /* Original envvar way - prone to display issues
- const char *cenv = getenv("COLUMNS");
- if(cenv != NULL) {
- return atoi(cenv);

I am curious to know if that's the only way that works for you.