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milescovielloandClaude Opus 5.5
44d46ee97c
sceNetSend, sceNetSendto, sceNetRecv, sceNetRecvfrom, sceNetRecvmsg and
sceNetSendmsg failed with EOPNOTSUPP for any flag other than MSG_PEEK on
a receive, so a game polling a socket with MSG_DONTWAIT got an error on
every call instead of its data or EWOULDBLOCK.
FreeBSD 11.4 defines the flag in sys/sys/socket.h:
#define MSG_DONTWAIT 0x80 /* this message should be nonblocking */
and soreceive_generic() (sys/kern/uipc_socket.c) treats it like a
non-blocking socket for that one call:
if ((so->so_state & SS_NBIO) ||
(flags & (MSG_DONTWAIT|MSG_NBIO))) {
SOCKBUF_UNLOCK(&so->so_rcv);
error = EWOULDBLOCK;
goto release;
shadPS4's sceNet uses the same value (ORBIS_NET_MSG_DONTWAIT 0x80).
On Linux and macOS the flag now maps to the host's MSG_DONTWAIT, alone
or with MSG_PEEK on a receive. Winsock has no per-call non-blocking
flag, so Windows keeps failing with EOPNOTSUPP for it; TechnicalDebt
records that. Other flags still fail with EOPNOTSUPP.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>