test

#define UDP_GRO 104

#endif

// macOS lacks sendmmsg/recvmmsg; so do OpenBSD, NetBSD and DragonFly BSD --

// only FreeBSD 11+ and Linux have them. This guard previously only checked

// __APPLE__, so every other BSD unconditionally called ::sendmmsg/::recvmmsg

// (declared, if at all, only via a stray <sys/uio.h> comment, not an actual

// prototype) -- whatever happened to link/run before was accidental, not a

// tested code path.

#if defined(__linux__) || defined(__FreeBSD__)

// macOS lacks sendmmsg/recvmmsg entirely, so do OpenBSD, NetBSD and

// DragonFly BSD -- calling them there doesn't compile. FreeBSD 11+ does

// have the symbols, but sendmmsg() to an explicit (unconnected) peer

// address has been observed there to fail a QUIC server's Retry/handshake

// sends with EINVAL, even though the identical arguments work fine via

// plain sendto() -- not something a Linux dev box can repro (it accepts

// this call shape fine). Rather than special-case that one FreeBSD failure

// mode, only Linux -- where this path is actually exercised and trusted --

// gets the real sendmmsg/recvmmsg path; every other platform, FreeBSD

// included, uses the sendto/recvfrom fallback below.

#if !defined(__linux__) && !defined(__FreeBSD__)

#define NETPLUS_NO_MMSG 1

#endif

    // --- sendmmsg path ---

#ifdef NETPLUS_NO_MMSG

    // Fallback: sendto loop for platforms without sendmmsg

    // Fallback: sendto loop for platforms without a trusted sendmmsg.

    // Mirrors sendmmsg()'s own contract (-1/errno if nothing at all went

    // out, otherwise the count sent before the first failure) instead of

    // silently reporting "0 sent, no error" -- callers like

    // quic::sendRetryPacket() log errno precisely because they need to see

    // real failures, not just a suspiciously-low count.

    int sent = 0;

    for (size_t i = 0; i < count; ++i) {

        ssize_t r;

        } else {

            r = ::send(_Socket, datagrams[i].first, datagrams[i].second, MSG_DONTWAIT);

        }

        if (r < 0) break;

        if (r < 0) {

            if (sent == 0) return -1;

            break;

        }

        ++sent;

    }

#else