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/* OPT v3.9: options parsing tool */
/*
*
* Copyright (C) 1996,1997,1998,1999 James Theiler
*
* 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 2 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 (it is in the file COPYING); if not, write
* to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*
*/
/* iloop.c */
/* This routine shows how the interrupt works, when, for example, you
* are in an infinite loop. To try this out run it in the menu mode,
* ie
*
* iloop --menu
* ->
*
* If you enter 'N -1 =', meaning run with N=-1 (no, this isn't
* postfix!) then after 100 times through the loop, it will interrupt
* itself with optAbortRun() which will bring you back to the menu.
* If you enter any other negative N (or just a VERY large positive
* N), then you will get into an infinite loop. Hit ^C to get out of
* the loop. If the signal trapping works, then you should be
* returned to the prompt instead of exiting the whole program.
*
*/
#include <stdio.h>
#include <opt.h>
long N=1;
int run()
{
long n;
/** if N is negative, this gives an infinite loop **/
for (n=0; n!=N; ++n) {
printf("Type ^C to exit\n");
if (n==10 && N == -1) optAbortRun();
}
return OPT_OK;
}
int
main(int argc, char **argv)
{
optreg(&N,OPT_LONG,'N',"Number of times through the loop");
optRun(run);
opt(&argc,&argv);
return run();
}
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