--- /dev/null
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+void print_help(char name[])
+{
+ printf("\n");
+ printf("Simulates execution of an program. \n");
+ printf("\n");
+ printf("Usage: %s \n", name);
+ printf("The default action of the program is to return with 0 (success) \n");
+ printf(" -eNN=MM Return with value NN with a probability of MM% \n");
+ printf("\n");
+}
+
+
+void parse_argv(char argv[], int *retval, int *percentage)
+{
+ if ( sscanf(argv,"-e %d = %d",retval,percentage)!=2 )
+ {
+ printf("Argument sytax error : %s \n", argv);
+ exit(EXIT_FAILURE);
+ }
+
+ if ( *percentage <= 0 )
+ {
+ printf("Percentage argument must be > 0");
+ exit(EXIT_FAILURE);
+ }
+}
+
+
+
+int main (int argc, char** argv)
+{
+ int i, rand_value, sum;
+ int retvals[100];
+ int percentages[100];
+
+ if (argc==2 && strcmp("--help",argv[1])==0 )
+ {
+ print_help(argv[0]);
+ return 1;
+ }
+
+
+ for (i=1; i<argc; i++)
+ {
+ parse_argv(argv[i], retvals+i-1, percentages+i-1);
+ }
+
+
+ /* Get random number in interval [0,100) */
+ srand(time(0));
+ rand_value = rand() % 100;
+
+ /* See if we want to fire an "error" */
+ sum = 0;
+ for (i=0; i<argc-1; i++)
+ {
+ sum += percentages[i];
+ if ( rand_value < sum )
+ {
+ printf("Simulated error : %d \n", retvals[i]);
+ return retvals[i];
+ }
+ }
+
+ /* No "error" */
+ return 0;
+}