Very Computer

1. Problem in getting screen size when 'rlogin' and 'telnet'

Hi,
        I have a problem in getting screen size using "ioctl" function.

        The following program returns the correct screen size if the term is
by "rlogin" but does return an error if term is by "telnet".

#include<stdio.h>
#include<termios.h>
#include<unistd.h>
extern int errno;
main()
{
   struct winsize ws;

   if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) < 0)
        printf("%d is the errno\n", errno);

   printf("%d is the width\n", ws.ws_col);
   printf("%d is the length\n", ws.ws_row);

The output for the above program from an "rlogin" window is
90 is the width
58 is the length

The output from a "telnet" window is
22 is the errno
0 is the width
0 is the length

Could anybody educate me regarding this?

        Also "stty" behaves differently from "rlogin" window and from a "telnet"
window.
        The command "stty rows 24" works Okay on an "rlogin" terminal
but, on a "telnet" terminal it gives the following error:
        unknown mode: rows

Could anybody help me in this regard? Please send me email.

Thanks

vasant

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