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/* OPT v3.19: options parsing tool */
/*
* This SOFTWARE has been authored by an employee of the University of
* California, operator of the Los Alamos National Laboratory under
* Contract No. W-7405-ENG-36 with the U.S. Department of Energy. The
* U.S. Government has rights to use, reproduce, and distribute this
* SOFTWARE. Neither the Government nor the University makes any
* warranty, express or implied, or assumes any liability or
* responsibility for the use of this SOFTWARE. If SOFTWARE is modified
* to produce derivative works, such modified SOFTWARE should be clearly
* marked, so as not to confuse it with the version available from LANL.
*
* Additionally, this program is free software; you can distribute 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 any later version. Accordingly, this program is
* distributed in the hope that it will be useful, but WITHOUT A
* WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details (http://www.gnu.org/copyleft/gpl.txt).
*
*
* The OPT package is available from
* http://nis-www.lanl.gov/~jt/Software
*/
/* 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 0;
}
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