cygwin.dll src question: fork()

[Tim Newsham]

Hi,

   Question: Why is a setjmp/longjmp pair used in __fork():

        static int
        __fork ()
        {
          jmp_buf b;
          int r;
        
          if ((r = setjmp (b)) != 0)
            {
              r = r == -2 ? -1 : r == -1 ? 0 : r;
              return r;
            }
        
          r = cygwin_fork_helper1 (u->data_start, u->data_end,
                                         u->bss_start, u->bss_end);
        
          /* Must convert result to get it through setjmp ok.  */
          longjmp (b, r == -1 ? -2 : r == 0 ? -1 : r);
        }

At the time when cygwin_fork_helper1() returns isn't the
child's state already a copy of the parent's state?

                                        Tim N.

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