What we did (for this exact same application :-) was write our own routine to get a line of data one character at a time using select. Here's the relevant bit of code (modified slightly from the actual code we use):

sub Gets {
   my($fh, $timeout) = @_;
   my($str, $c, $rin, $rout, $found, $timeleft);

   $rin = ''; vec($rin, fileno($fh), 1) = 1;

   $timeout ||= 1;
   while (1) {
      ($found, $timeleft) = select($rout=$rin, undef, undef, $timeout)
+;
      last unless $found;
      sysread($fh, $c, 1);
      $str .= $c if ($c ne "\0");
      last if ($c eq "\n");
   }
   return $str;
}

[download]

Hope this helps!

duff

In reply to Re: Serial I/O and time question by duff
in thread Serial I/O and time question by shepner

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