- Call fork1() directly instead of calling rfork() so that it doesn't mask   out RFSTOPPED. - Lock the child process when settings p_sigparent instead of locking the   parent.
- Call fork1() directly instead of calling rfork() so that it doesn't mask
  out RFSTOPPED.
- Lock the child process when settings p_sigparent instead of locking the
  parent.

Pointy-hat to:	me

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