Date: Fri, 13 Sep 2019 11:55:49 -0700 From: Conrad Meyer <cem@freebsd.org> To: Mark Johnston <markj@freebsd.org> Cc: Ryan Stone <rysto32@gmail.com>, FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: Deadlock involving truss -f, pdfork() and wait4() Message-ID: <CAG6CVpV03BQfu8f5Tc-bkfASCB_wiR-SNhQpsLLZf=1EHsEJdQ@mail.gmail.com> In-Reply-To: <20190913183718.GC84156@raichu> References: <CAFMmRNwRWZsQhMSY7MwS2kU-qNJ0%2BPk676mi59_Y3QsbcEmPVQ@mail.gmail.com> <CAGOYWV-v1-F3dWQovdj5TZMZeBFifDm020AXnPYdZSHPKLG4SA@mail.gmail.com> <CAFMmRNzhsk-1BO6iyJz7_qtgnRqC%2BfPpYSuQnxEZyno%2BO1K71Q@mail.gmail.com> <20190913183718.GC84156@raichu>
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On Fri, Sep 13, 2019 at 11:37 AM Mark Johnston <markj@freebsd.org> wrote: > > 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(). Explicit PID: https://people.freebsd.org/~rstone/pdfork.c Best, Conrad
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