[Gnuplot-info] How do I get gnuplot to exit, when it has been opened through a pipe from within an application?

[Levinthal, D. A <dav...@in...>]

I can't figure out how to get the gnuplot process to terminate at the
end of my application..The x window remains open and the process hangs
at the end..  the fprintf's to stderr seem to imply all is well..but the
xwindow is persistant and the application cannot exit

Note: that I need to have the plots stay there during execution, without
having to put the application in a sleep state..(The display is of a
numerical solution converging..)

??

d

Gnuplot is being invoked with:

            if((gplot =3D=3D 1) && (current_processor =3D=3D 0)){

                    // Gnuplot initialization

                        fgnuplot =3D popen("/usr/bin/gnuplot -persist",
"w");

                        if (fgnuplot =3D=3D NULL) {

                             fprintf(stderr, "popen call failed!, unable
to start gnuplot");

                        } else {=20

                                    // initial settings

                                    fprintf(fgnuplot, "set data style
lines\n");

                                    fprintf(fgnuplot, "set hidden3d\n");

                                    fprintf(fgnuplot, "set contour
base\n");

                                    fprintf(fgnuplot, "set
zrange[-20:20]\n");

                                    fflush(fgnuplot);

=20

                        }

            }

=20

And then all sorts of attempts at killing it off seem to fail???

                        if ((gplot =3D=3D 1) && fgnuplot) {

                                    // Gather results

                                    for(iproc=3D0; iproc <
number_of_processors; iproc++)

                                    for ( i =3D 0 ; i < plrows ; i++ )

                                                for ( j =3D 0 ; j <
PLOTDIM ; j++ )

                                                            plot[i +
iproc*plrows][j] =3D
result[i*iplstride+iplstart[0]+nrows*iproc][j*jplstride + jplstart];

                                    fprintf(stderr,"gathered plot\n");

                                    save2DArray(plot, PLOTDIM,PLOTDIM,
1, 1, "fout.dat");

                                    fprintf(fgnuplot, "set title
\"Converged in %d iterations\"\n", k);

                                    fprintf(fgnuplot, "splot 'fout.dat'
matrix\n");

                                    fflush(fgnuplot);

                                    // wait for gnuplot to exit

                                    fclose(fgnuplot);

                       =20

//                                  wait(&rc);

                        printf("root node: finished\n");

                        }

=20

Or

                        if ((gplot =3D=3D 1) && fgnuplot) {

                                    printf(" in plotting section on root
node\n");

                                    // Gather results

                                    for(iproc=3D0; iproc <
number_of_processors; iproc++)

                                    for ( i =3D 0 ; i < plrows ; i++ )

                                                for ( j =3D 0 ; j <
PLOTDIM ; j++ )

                                                            plot[i +
iproc*plrows][j] =3D
result[i*iplstride+iplstart[0]+nrows*iproc][j*jplstride + jplstart];

                                    fprintf(stderr,"gathered plot\n");

                                    save2DArray(plot, PLOTDIM,PLOTDIM,
1, 1, "fout.dat");

                                    fprintf(fgnuplot, "set title
\"Converged in %d iterations\"\n", k);

                                    fprintf(fgnuplot, "splot 'fout.dat'
matrix\n");

                                    fprintf(stderr, "finished final
fprintf(fgnuplot  \n");

                                    fflush(fgnuplot);

                                    fprintf(stderr, "finished final
fflush\n");

                                    fprintf(fgnuplot, " quit\n");

                                    fprintf(fgnuplot, " exit\n");

                                    // wait for gnuplot to exit

                                    wait(&rc);

                                    fprintf(stderr, "finished wait =3D
%i\n", rc);

                                    pstatus =3D pclose(fgnuplot);

                                    fprintf(stderr, "finished plcose =3D
%i\n", pstatus);

                                   =20

                       =20

                        printf("root node: finished\n");

                        }