/usr/share/octave/packages/parallel-2.2.0/select_sockets.m is in octave-parallel 2.2.0-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 | ## Copyright (C) 2013 Olaf Till <i7tiol@t-online.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, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {[@var{n}, @var{idx}] =} select_sockets (@var{sockets}, @var{timeout}[, @var{nfds}])
## Calls Unix @code{select}.
##
## @var{sockets}: valid sockets matrix as returned by @code{connect}.
##
## @var{timeout}: seconds, negative for infinite.
##
## @var{nfds}: optional, default is Unix' FD_SETSIZE (platform
## specific). Passed to Unix @code{select} as the first argument --- see
## there.
##
## An error is returned if nfds or a watched filedescriptor plus one
## exceeds FD_SETSIZE.
##
## Return values are: @var{idx}: index vector to rows in @var{sockets}
## with pending input, readable with @code{recv}. @var{n}: number of
## rows in @var{sockets} with pending input.
## @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 || ...
columns (sockets) != 3)
error ("no valid sockets matrix");
endif
[n, ridx] = ...
select (cat ...
(2, {varargin{1}(:, 1)}, {[], []}, varargin(2:end)){:});
endfunction
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