Re: [Bug-gnulib] getpass echoes on many systems

[Larry Jones]

Paul Eggert writes:
> 
> But I don't see anywhere where the C or POSIX standards prohibit fopen
> from returning stdin.

Indeed; I hadn't considered the case where stdin and/or stderr has been
closed.  In that case, it's also possible that stdin == stderr:

        fclose (stderr);
        fclose (stdin);
        stderr = fopen ("/dev/null", "r");

So neither test is reliable -- we need an auxiliary variable instead.

-Larry Jones

I've got an idea for a sit-com called "Father Knows Zilch." -- Calvin