getpeername on a socketpair end returned the unnamed AF_UNIX address
even after the other end was closed. In FreeBSD 11, closing an end runs
uipc_detach, whose unp_disconnect and unp_drop clear SS_ISCONNECTED on
both stream and datagram ends, and kern_getpeername then fails with
ENOTCONN. Each end now keeps a weak reference to its peer's socket,
which expires when the peer's last descriptor, duplicates included, is
closed. shutdown leaves the ends connected, as soshutdown does.
A kqueue descriptor is ready for POLLIN and POLLRDNORM while one of its
events is triggered and for no other event, as FreeBSD's kqueue_poll
answers; poll threw for it on both hosts. A kqueue cannot be waited on,
so while one is polled poll checks it every millisecond and waits on the
other descriptors in slices of 1 ms. This is the loop Windows already
used for pipes, which Linux now shares.
A kqueue closed during the wait reports POLLNVAL, and one whose number
was reused is polled again with the rest of the timeout, as FreeBSD's
pollrescan looks the descriptor up again.
Depends on #7248.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
sosend_generic fails a send on a socket that can send no more with EPIPE
before it looks at so_error. Winsock reports the same send as WSAECONNABORTED
or WSAECONNRESET, which reached the guest as ECONNABORTED or ECONNRESET.
A stream send now maps both to EPIPE. The send-after-close checks of
guest_tcp, guest_socket_read_write and guest_socket_pair run on Windows too.
Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
FreeBSD 11.4's soconnectat() (sys/kern/uipc_socket.c) disconnects a
connected socket of a protocol without PR_CONNREQUIRED before it calls
pru_connect. udp_disconnect() and udp6_disconnect() drop the peer and
reset the local address, then in_pcbconnect_setup() and in6_pcbladdr()
fail port 0 with EADDRNOTAVAIL, so the socket is left unconnected.
connect to port 0 on a connected datagram socket now dissolves the
association through the AF_UNSPEC disconnect path before failing with 49,
where it kept the old peer. Stream sockets keep EISCONN.
The PS5 3.20 export lists have pselect in libkernel as well as
libkernel_sys, and on Windows a libkernel import never reaches
libkernel_sys. The implementation moves unchanged to
libkernel/Socket/src/Pselect.cpp, beside select.
On Linux the host keeps data that was buffered before shutdown(SHUT_RD) and
guest_socket_pair expects to read it, so the shortcut that answers 0 for any
receive after SHUT_RD broke that test there. Limit the shortcut to Windows,
where the host cannot answer it, and run the post-shutdown receives of
guest_tcp on Windows only.
Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
soreceive_generic returns 0 for a socket whose receive side is shut and for a
zero-length receive on a connected stream socket (ENOTCONN when it is not
connected), without waiting. Winsock fails the first with WSAESHUTDOWN, which
reached the guest as EPIPE, and blocks the second until data arrives. recv and
recvfrom now answer both themselves.
Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Dean