// Test that SupportSockNonblockCloexec returns true if socket succeeds with SOCK_NONBLOCK and SOCK_CLOEXEC.
	s, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_STREAM|syscall.SOCK_NONBLOCK|syscall.SOCK_CLOEXEC, 0)
	if err == nil {
		syscall.Close(s)
	}
	wantSock := err != syscall.EPROTONOSUPPORT && err != syscall.EINVAL
	gotSock := unix.SupportSockNonblockCloexec()
	if wantSock != gotSock {

			}
		}
		ver = nil
		return
	}

	major = parseNext()
	minor = parseNext()

	return
}

// SupportSockNonblockCloexec tests if SOCK_NONBLOCK and SOCK_CLOEXEC are supported
// for socket() system call, returns true if affirmative.
var SupportSockNonblockCloexec = sync.OnceValue(func() bool {
	// First test if socket() supports SOCK_NONBLOCK and SOCK_CLOEXEC directly.

// descriptor as nonblocking and close-on-exec.
func sysSocket(family, sotype, proto int) (int, error) {
	// Perform a cheap test and try the fast path first.
	if unix.SupportSockNonblockCloexec() {
		s, err := socketFunc(family, sotype|syscall.SOCK_NONBLOCK|syscall.SOCK_CLOEXEC, proto)
		if err != nil {
			return -1, os.NewSyscallError("socket", err)
		}
		return s, nil
	}