Function FD_ISSET

crates/stdlib/src/select.rs:51–54

(fd: RawFd, set: *mut fd_set)

    }

    pub unsafe fn FD_ISSET(fd: RawFd, set: *mut fd_set) -> bool {
        use WinSock::__WSAFDIsSet;
        unsafe { __WSAFDIsSet(fd as _, set) != 0 }
    }

    pub fn check_err(x: i32) -> bool {
        x == WinSock::SOCKET_ERROR