primes.txt

#include "kernel/types.h"
#include "kernel/stat.h"
#include "user/user.h"

int sieve(int p)
{
    int num;
    int pipe_read;
    int pipe_write;
    int pid;
    int n;
    
    pipe_read = p;

   while(1)
   {
      if(read(pipe_read,&num,sizeof(num) == 0)
      {
          exit(0);
      }
   
   
   printf("primes %d\n",num);
   
   int pipe_fds[2];
   pipe(pipe_fds);
   pipe_write = pipe_fds[1];
  
   pid = fork();
   if(pid < 0)
   {
     printf("fail\n");
     exit(-1);
   }
   else(pid == 0)
   {
    close(pipe_fds[0]);
    while(read(pipe_read,&n,sizeof(n) != 0))
    {
        if(n % m != 0)
        {
            write(pipe_write,%n,sizeof(n));
        }
    }
   }
   else
   {
     close(pipe_read);
     close(pipe_write);
     wait(0);
   }
   pipe_read = pipe_fds[0];

  } 
  return pipe_read;
}


int main(int argc,char *argv[])
{
  int pipe_fds[2];
  
  for(int i = 2;i <= 35; i++)
  {
    write(pipe_fds[1],&i,sizeof(i));
  }
  
  close(pipe_fds[1]);
  
  close(sieve(pipe_fds[0]));

  exit(0);
  
}