Re: [PATCH 3/3] vl: Unlink absolute PID file path

["Daniel P. Berrangé" <berrange@redhat.com>]

On Thu, Jun 09, 2022 at 02:27:01PM +0200, Hanna Reitz wrote:
> After writing the PID file, we register an exit notifier to unlink it
> when the process terminates.  However, if the process has changed its
> working directory in the meantime (e.g. in os_setup_post() when
> daemonizing), this will not work when the PID file path was relative.
> Therefore, pass the absolute path (created with realpath()) to the
> unlink() call in the exit notifier.
> 
> (realpath() needs a path pointing to an existing file, so we cannot use
> it before qemu_write_pidfile().)
> 
> Reproducer:
> $ cd /tmp
> $ qemu-system-x86_64 --daemonize --pidfile qemu.pid
> $ file qemu.pid
> qemu.pid: ASCII text
> $ kill $(cat qemu.pid)
> $ file qemu.pid
> qemu.pid: ASCII text
> 
> (qemu.pid should be gone after the process has terminated.)
> 
> Signed-off-by: Hanna Reitz <hreitz@redhat.com>
> ---
>  softmmu/vl.c | 30 ++++++++++++++++++++++++++----
>  1 file changed, 26 insertions(+), 4 deletions(-)

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>


With regards,
Daniel
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