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########################################################################
##
## Copyright (C) 2009-2022 The Octave Project Developers
##
## See the file COPYRIGHT.md in the top-level directory of this
## distribution or <https://octave.org/copyright/>.
##
## This file is part of Octave.
##
## Octave 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.
##
## Octave 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 Octave; see the file COPYING. If not, see
## <https://www.gnu.org/licenses/>.
##
########################################################################
## -*- texinfo -*-
## @deftypefn {} {@var{stream} =} __gnuplot_open_stream__ (@var{npipes}, @var{h})
## Undocumented internal function.
## @end deftypefn
function plot_stream = __gnuplot_open_stream__ (npipes, h)
[prog, args] = gnuplot_binary ();
if (npipes > 1)
[plot_stream(1), plot_stream(2), pid] = popen2 (prog, args{:});
if (pid < 0)
error ("__gnuplot_open_stream__: failed to open connection to gnuplot");
else
plot_stream(3) = pid;
endif
else
plot_stream = popen (sprintf ("%s ", prog, args{:}), "w");
if (plot_stream < 0)
error ("__gnuplot_open_stream__: failed to open connection to gnuplot");
endif
endif
if (nargin > 1)
set (h, "__plot_stream__", plot_stream);
endif
endfunction
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