Thread: another problem with functions & parameters

Hi there

i've got this type of thing in a function

Code:

int function1(char *buf, int *size, int options)
{

  forking
  if child{
           function2(buf,size);
           printf("buf of child:%s",buf); //OK
   }
  if parent{
     //using semaphores i made this part guaranteed to run after the child  returned from function2 
     printf("buf of parent:%s",buf);//empty :s
  }

}

function 2 then changes the value of the buf and are returns the changed value through the parameter... I want such that buf is ok when printed from the parent that is will also be the new updated value for whoever calls function1 in the first place... the problem is not how to make the parent run after i did that already... i need to know how to return buf...

Thanks

I'm kind of confused as to what you're actually trying to do. I understand that you're receiving buf as a parameter in the first function. After you fork(), the child will modify buf by means of the second function, but the parent will have the original version.

If you want both the child and parent to have the same value of buf, namely the changed one, then you should change it before fork()ing.

If you need the parent or another child to know the value of a variable that has been changed by another child, then yes, you'll need some way to communicate or share memory.