cygwin.dll src question: fork()

Wed Oct 29 00:49:00 GMT 1997

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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