linux: Add pidfd_getfd
This was added on Linux 5.6 (8649c322f75c96e7ced2fec201e123b2b073bf09) as a way to retrieve a file descriptors for another process though pidfd (created either with CLONE_PIDFD or pidfd_getfd). The functionality is similar to recvmmsg SCM_RIGHTS. Reviewed-by:Carlos O'Donell <carlos@redhat.com> Tested-by:
Carlos O'Donell <carlos@redhat.com>
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