Deadlock involving truss -f, pdfork() and wait4()

[Mark Johnston]

On Fri, Sep 13, 2019 at 02:12:56PM -0400, Ryan Stone wrote:
> This gets me a little further but now the wait4 call by the parent
> never reaps the child and instead blocks forever:

Does it perform a wildcarded wait(), or does it explicitly specify the
PID of the child?  By design, the former will not return children
created by pdfork().