shared virtual memory

[green tinsel]

Hello everyone, my program compiles and works well with everything my professor is asking for when using the necessary testing values but when i run my code in the autograder, every IO Test passes but the structural code fails and this is the error i get -- Exit code: 1.
stdout:
stderr: , here is my code :

#include <sys/mman.h>
#include <sys/stat.h>        /* For mode constants */
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <semaphore.h>
#include <string.h>
#include <errno.h>
#include <math.h>

long createSamples(unsigned wID,long nbSamples,double d)
{
   long ttl = 0; // Number of events detected by a process
   unsigned seed = wID; //seed for random number generation

   for(long i = 0; i < nbSamples; i++) {
       double x = (double)rand_r(&seed) / RAND_MAX;
       double y = (double)rand_r(&seed) / RAND_MAX;
       if(fabs(x - y) < d) {
           ttl++;
       }
   }

   return ttl;
}

int main(int argc,char* argv[])
{
   if (argc < 4) {
      printf("usage: rpair <d> <samples> <workers>\n");
      exit(1);
   }
   float d = atof(argv[1]); // value of d
   long s  = atol(argv[2]); // total number of trials to be executed
   int nbW = atoi(argv[3]); // number of worker processes

   long ttl = 0; //total number of events
   double p = 0; //Probability of the occurence of events

   long *shared_memory = mmap(NULL, sizeof(long), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0);
   *shared_memory = 0;

   long samples_per_worker = s / nbW;

   for(int i = 0; i < nbW; i++) {
       if(fork() == 0) {
           *shared_memory += createSamples(i, samples_per_worker, d);
           exit(0);
       }
   }

   for(int i = 0; i < nbW; i++) {
       wait(NULL);
   }

   ttl = *shared_memory;
   p = (double)ttl / s;

   printf("Total trials = %ld \t Total events = %ld \t Probability = %lf\n",s,ttl,p);
   munmap(shared_memory, sizeof(long));
   return 0;
}```

[bold spear]

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[timber vessel]

What does "structural code" mean

[green tinsel]

sorry i meant "structural test"

which from my understanding it means

the structure test is looking for keywords in your source code to make sure you're implementing your solution as specified in the instructions
so if it fails, it's not finding the right word in your source code

[timber vessel]

I would be surprised if they did that, however auto graders do all sorts of nonsense

[green tinsel]

im not sure if it is something to do with what I do after I am done with the shared memory?

[timber vessel]

You'll have to consult the guidelines you were given to understand what you need to do better if that is the case

[green tinsel]

nvm i ended up figuring it out from some lecture sludes

slides*

!solved

[bold spear]

Thank you and let us know if you have any more questions!

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[timber vessel]

What was it