MLAbort

#include <math.h>
#include "mathlink.h"

/* totals the numbers and calculates the square root */

double f(double* list, int len)
{
    double sum;

    while(len--)
    {
        sum += *list++;
        /* check for the abort */
        if(MLAbort) return (double)0;
    }

    return sqrt(sum);
}