File Descriptor Transfer over Unix Domain Sockets

Update 12/31/2020: If you’re on a newer kernel (Linux 5.6+), much of this complexity has been obviated with the introduction of a new system call pidfd_getfd. Please see the post Seamless File Descriptor Transfer Between Processes with pidfd and pidfd_getfd published on 12/31/2020 for more details. Yesterday, I read a phenomenal paper on how disruption free release of services that speak different