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## Copyright (C) 2010 Olaf Till <olaf.till@uni-jena.de>
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
## -*- texinfo -*-
## @deftypefn {Function File} {[@var{n}, @var{idx}] =} select_sockets
## (@var{sockets}, @var{timeout}[, @var{nfds}])\n\
## Calls Unix @code{select}.\n\
## @var{sockets}: valid sockets matrix as returned by @code{connect}.\n\
## @var{timeout}: seconds, negative for infinite.\n\
## @var{nfds}: optional, default is Unix' FD_SETSIZE (platform specific).\n\
## Passed to Unix @code{select} as the first argument --- see there.\n\
## An error is returned if nfds or a watched filedescriptor \n\
## plus one exceeds FD_SETSIZE.\n\
## Return values are:\n\
## @var{idx}: index vector to rows in @var{sockets} with pending input\n\
## readable with @code{recv}.\n\
## @var{n}: number of rows in @var{sockets} with pending input.\n\
## @end deftypefn
function [n, ridx] = select_sockets (varargin)
if ((nargin = columns (varargin)) < 2 || nargin > 3)
error ("two or three arguments required");
endif
if (! ismatrix (sockets = varargin{1}) || rows (sockets < 1) || \
colums (sockets) != 3)
error ("no valid sockets matrix");
endif
[n, ridx] = \
select (cat \
(2, {varargin{1}(:, 1)}, {[], []}, varargin(2:end)){:});