Fixes https://github.com/google/gvisor/issues/6015 | Added EventRdHUp to waiter events | Added POLLRDHUP delivery on half-closed connection detection | Added POLLRDHUP delivery on local read end shutdown
This will be used to plumb the syscall number through to a counter metric that
exports the number of times an unimplemented syscall has been called.
Plenty of syscall implementations call `EmitUnimplementedEvent` for flags and
settings that are not implemented. With `sysno` available, they will be able
to plumb that bit of information through.
PiperOrigin-RevId: 518635831
A few fixes in here:
* Linux does not transition the state of a non-blocking socket to SS_CONNECTED
when the connect happens asynchronously. Instead, it leaves the state as
SS_CONNECTING (seems like a Linux bug, but OK). This can introduce weird
behavior for subsequent connect() calls. gVisor now forces the state to
update to SS_CONNECTED by calling connect() twice.
* Socket shutdown events are slightly different between gVisor and linux. We
already assert different behavior between the two environments, and now we
also have to check for gVisor+hostinet instead of just gvisor.
* Handle send/recv timeouts, which fixes blocking for read()/write() syscalls.
* Handle cases like MSG_PEEK where the senderAddress is not returned.
* Pass through some more socketopts, and allow them in the syscall filters.
Something is still wrong with shutdown() and poll() calls, so those tests are
temporarily disabled. I'm looking at those next.
This also fixes a number of other syscall test suites, so those are enabled as
well.
PiperOrigin-RevId: 508397317
