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Previously the spec did not say where in a message the FDs should be sent. As I understand it, FDs transferred in ancillary data will always be received along with the first byte of the data they were sent with, so we should define which byte that is. Going by both libvhost-user in QEMU and the rust-vmm crate, that byte is the first byte of the message header. This is important to specify because it would make back-end implementation significantly more complicated if receiving file descriptors in the middle of a message had to be handled. Signed-off-by: Alyssa Ross <hi@alyssa.is> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Message-Id: <20251106192105.3456755-1-hi@alyssa.is>