| //! SGX-specific extensions to general I/O primitives |
| //! |
| //! SGX file descriptors behave differently from Unix file descriptors. See the |
| //! description of [`TryIntoRawFd`](trait.TryIntoRawFd.html) for more details. |
| #![unstable(feature = "sgx_platform", issue = "56975")] |
| |
| use crate::net; |
| pub use crate::sys::abi::usercalls::raw::Fd as RawFd; |
| use crate::sys::{self, AsInner, FromInner, IntoInner, TryIntoInner}; |
| |
| /// A trait to extract the raw SGX file descriptor from an underlying |
| /// object. |
| #[unstable(feature = "sgx_platform", issue = "56975")] |
| pub trait AsRawFd { |
| /// Extracts the raw file descriptor. |
| /// |
| /// This method does **not** pass ownership of the raw file descriptor |
| /// to the caller. The descriptor is only guaranteed to be valid while |
| /// the original object has not yet been destroyed. |
| #[unstable(feature = "sgx_platform", issue = "56975")] |
| fn as_raw_fd(&self) -> RawFd; |
| } |
| |
| /// A trait to express the ability to construct an object from a raw file |
| /// descriptor. |
| #[unstable(feature = "sgx_platform", issue = "56975")] |
| pub trait FromRawFd { |
| /// Constructs a new instance of `Self` from the given raw file |
| /// descriptor. |
| /// |
| /// This function **consumes ownership** of the specified file |
| /// descriptor. The returned object will take responsibility for closing |
| /// it when the object goes out of scope. |
| /// |
| /// This function is also unsafe as the primitives currently returned |
| /// have the contract that they are the sole owner of the file |
| /// descriptor they are wrapping. Usage of this function could |
| /// accidentally allow violating this contract which can cause memory |
| /// unsafety in code that relies on it being true. |
| #[unstable(feature = "sgx_platform", issue = "56975")] |
| unsafe fn from_raw_fd(fd: RawFd) -> Self; |
| } |
| |
| /// A trait to express the ability to consume an object and acquire ownership of |
| /// its raw file descriptor. |
| #[unstable(feature = "sgx_platform", issue = "56975")] |
| pub trait TryIntoRawFd: Sized { |
| /// Consumes this object, returning the raw underlying file descriptor, if |
| /// this object is not cloned. |
| /// |
| /// This function **transfers ownership** of the underlying file descriptor |
| /// to the caller. Callers are then the unique owners of the file descriptor |
| /// and must close the descriptor once it's no longer needed. |
| /// |
| /// Unlike other platforms, on SGX, the file descriptor is shared between |
| /// all clones of an object. To avoid race conditions, this function will |
| /// only return `Ok` when called on the final clone. |
| #[unstable(feature = "sgx_platform", issue = "56975")] |
| fn try_into_raw_fd(self) -> Result<RawFd, Self>; |
| } |
| |
| impl AsRawFd for net::TcpStream { |
| fn as_raw_fd(&self) -> RawFd { |
| *self.as_inner().as_inner().as_inner().as_inner() |
| } |
| } |
| |
| impl AsRawFd for net::TcpListener { |
| fn as_raw_fd(&self) -> RawFd { |
| *self.as_inner().as_inner().as_inner().as_inner() |
| } |
| } |
| |
| impl FromRawFd for net::TcpStream { |
| unsafe fn from_raw_fd(fd: RawFd) -> net::TcpStream { |
| let fd = sys::fd::FileDesc::from_inner(fd); |
| let socket = sys::net::Socket::from_inner(fd); |
| net::TcpStream::from_inner(sys::net::TcpStream::from_inner((socket, None))) |
| } |
| } |
| |
| impl FromRawFd for net::TcpListener { |
| unsafe fn from_raw_fd(fd: RawFd) -> net::TcpListener { |
| let fd = sys::fd::FileDesc::from_inner(fd); |
| let socket = sys::net::Socket::from_inner(fd); |
| net::TcpListener::from_inner(sys::net::TcpListener::from_inner(socket)) |
| } |
| } |
| |
| impl TryIntoRawFd for net::TcpStream { |
| fn try_into_raw_fd(self) -> Result<RawFd, Self> { |
| let (socket, peer_addr) = self.into_inner().into_inner(); |
| match socket.try_into_inner() { |
| Ok(fd) => Ok(fd.into_inner()), |
| Err(socket) => { |
| let sys = sys::net::TcpStream::from_inner((socket, peer_addr)); |
| Err(net::TcpStream::from_inner(sys)) |
| } |
| } |
| } |
| } |
| |
| impl TryIntoRawFd for net::TcpListener { |
| fn try_into_raw_fd(self) -> Result<RawFd, Self> { |
| match self.into_inner().into_inner().try_into_inner() { |
| Ok(fd) => Ok(fd.into_inner()), |
| Err(socket) => { |
| let sys = sys::net::TcpListener::from_inner(socket); |
| Err(net::TcpListener::from_inner(sys)) |
| } |
| } |
| } |
| } |