i made a lot of processes. here is the code:

main()
{
printf("\nEnter K="); scanf("%d",&k);
printf("Enter L="); scanf("%d",&l);
printf("\nFather id=%d\n",getpid());
x=0;
makechild();
sleep(2);
return 1;
}
int makechild()
{
for(q=1;q<=k;q++)
{
if(f=fork())
{
}
else
{
printf("\nChild id=%d owner=%d\n",getpid(),getppid());
++x;
if(x<l) makechild();
sleep(1);
exit(0);
}
}
return;
}

it basically creates a tree of processes over L rows, each process having K sons.

now, my question is: how can i make these processes comunicate between them?
i figured i would need a lot of pipes but i can't seem to implement them and i'm getting sick with 'broken pipe' error.
can anyone give me some advice?