get console window width: why ioctl always return 0 width?
 

Hi, all,
I use ioctl to get the cosole window size (the SSH window). I use the following code:

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struct winsize ws;
int returnValue = ioctl(pCommandStructure->terminal, TIOCGWINSZ, &ws);
int numberOfColumnsOfTerminalWindow = ws.ws_col;
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When I debug on linux pc, it gives me the correct window width. But after I try it on router (this is my enventual place where my code shall run), ioctl always give me 0 width, that is, numberOfColumnsOfTerminalWindow == 0. but the returnValue is 0 which means that the function call succeeds.

Can anyonen tell me what is the problem and how to solve it?

Thanks a lot.

There is no window on the router. So it will always be 0 width. Unless you have some kind of GUI running on the router ?

Thank you for reply. I use PuTTY to login to this router. I mean the window size of this console window. Any idea?