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When a hypercall-initiated read on a network device returns 0 (EOF) the tender returns SOLO5_R_AGAIN. In mirage-net-solo5 this results in listen retrying the read. If the file descriptor is really closed this will end in an infinite loop.
solo5/tenders/hvt/hvt_module_net.c
Lines 77 to 82 in bf29b8a
The spt target does not do anything special in the case of read(2) returns 0 as far as I can tell.
It is unclear to me if a file descriptor for a tap device could ever return EOF. I observe this by abusing the file descriptor mechanism for passing network devices in https://github.com/reynir/mirage-cat
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