Dean Galvin
64ca6e3329
fix(libkernel): follow pollscan for a pipe whose other end is closed
...
FreeBSD's pollscan clears POLLOUT whenever POLLHUP is set, so a write end
whose read end is closed reports POLLHUP alone, with POLLIN and POLLRDNORM
when they were asked for; both host paths reported POLLOUT | POLLHUP.
POLLOUT on a read end now throws. FreeBSD opens both ends FREAD | FWRITE
and pipe_poll reports the read end writable, which a one-way host pipe
cannot back.
guest_poll drained 1 KiB from the full pipe before expecting POLLOUT, but
Linux reports it only once a whole 4 KiB page is free, so the test aborted
there. It now drains the pipe, which is writable on every host.
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