[patch #6210] Make viewport {width, length} under direct ownership of the user interface

[John Darrington]

Follow-up Comment #9, patch #6210 (project pspp):

Everything looks fine to me, except that I'm confused by the code:

/* Wait for something to happen: either the user hits a key
         or changes the size of the window. */
      pfd.fd = STDIN_FILENO;
      pfd.events = POLLIN;
      retval = poll (&pfd, 1, -1);
      if (retval > 0 && pfd.revents & POLLIN) 
        {

I can't find any documentation which says that poll will return when the
program receives SIGWINCH.  For that, I thought you needed ppoll.   However,
it seems to work, so perhaps I'm missing something.

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