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@pid_eins My perhaps controversial opinion is that from userland the magic file descriptors should Just Work like actual file descriptors in every regard except that you can’t close() them or dup2 to them, but I guess that ship has sailed anyway.

(i.e. you should be able to stuff PIDFD_SELF into an SCM_RIGHTS control message and out of the other end pops a pidfd for your process; no need to pidfd_open(getpid()) and close() it)