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To: Proxmox Backup Server development discussion
<pbs-devel@lists.proxmox.com>, Dominik Csapak <d.csapak@proxmox.com>
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Subject: Re: [pbs-devel] [PATCH proxmox] daemon: clean up middle process of
double fork
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Am 29.11.24 um 16:37 schrieb Dominik Csapak:
> so we don't leave around a zombie process when the old daemon still
> needs to run, because of e.g. a running task.
>
> Since this is mostly a cosmetic issue though, only try a clean up
> once, so we don't unnecessarily block or run into other issues here.
> (It could happen that it didn't exit at that point, but it's very
> unlikely.)
>
> Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
> ---
> maybe the comment could be improved, but i tried to be not overly
> verbose there, since it's not really an issue anyway
>
> proxmox-daemon/src/server.rs | 13 +++++++++++--
> 1 file changed, 11 insertions(+), 2 deletions(-)
>
> diff --git a/proxmox-daemon/src/server.rs b/proxmox-daemon/src/server.rs
> index efea9078..edc64795 100644
> --- a/proxmox-daemon/src/server.rs
> +++ b/proxmox-daemon/src/server.rs
> @@ -165,10 +165,12 @@ impl Reloader {
> // No matter how we managed to get here, this is the time where we bail out quickly:
> unsafe { libc::_exit(-1) }
> }
> - Ok(ForkResult::Parent { child }) => {
> + Ok(ForkResult::Parent {
> + child: middle_child,
> + }) => {
> log::debug!(
> "forked off a new server (first pid: {}), waiting for 2nd pid",
> - child
> + middle_child
> );
> std::mem::drop(pnew);
> let mut pold = std::fs::File::from(pold);
> @@ -211,6 +213,13 @@ impl Reloader {
> log::error!("child vanished during reload: {}", e);
> }
>
> + // try exactly once to get rid of the zombie process of middle_child, but
> + // non blocking and without error handling, since it's just cosmetic
> + let _ = nix::sys::wait::waitpid(
> + middle_child,
> + Some(nix::sys::wait::WaitPidFlag::WNOHANG),
> + );
why not blocking though? If that does not work something would be seriously
wrong. But not _that_ hard feelings, as long as the old process exits this
will be cleaned up by systemd anyway, but I really would like to have some
error handling here, as that definitively can only help.
> +
> Ok(())
> }
> Err(e) => {
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