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//! SOLID-specific extensions to general I/O primitives
#![deny(unsafe_op_in_unsafe_fn)]
#![unstable(feature = "solid_ext", issue = "none")]
use crate::net;
use crate::sys;
use crate::sys_common::{self, AsInner, FromInner, IntoInner};
/// Raw file descriptors.
pub type RawFd = i32;
/// A trait to extract the raw SOLID Sockets file descriptor from an underlying
/// object.
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.
fn as_raw_fd(&self) -> RawFd;
}
/// A trait to express the ability to construct an object from a raw file
/// descriptor.
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.
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.
pub trait IntoRawFd {
/// Consumes this object, returning the raw underlying file descriptor.
///
/// 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.
fn into_raw_fd(self) -> RawFd;
}
#[stable(feature = "raw_fd_reflexive_traits", since = "1.48.0")]
impl AsRawFd for RawFd {
#[inline]
fn as_raw_fd(&self) -> RawFd {
*self
}
}
#[stable(feature = "raw_fd_reflexive_traits", since = "1.48.0")]
impl IntoRawFd for RawFd {
#[inline]
fn into_raw_fd(self) -> RawFd {
self
}
}
#[stable(feature = "raw_fd_reflexive_traits", since = "1.48.0")]
impl FromRawFd for RawFd {
#[inline]
unsafe fn from_raw_fd(fd: RawFd) -> RawFd {
fd
}
}
macro_rules! impl_as_raw_fd {
($($t:ident)*) => {$(
#[stable(feature = "rust1", since = "1.0.0")]
impl AsRawFd for net::$t {
#[inline]
fn as_raw_fd(&self) -> RawFd {
*self.as_inner().socket().as_inner()
}
}
)*};
}
impl_as_raw_fd! { TcpStream TcpListener UdpSocket }
macro_rules! impl_from_raw_fd {
($($t:ident)*) => {$(
#[stable(feature = "from_raw_os", since = "1.1.0")]
impl FromRawFd for net::$t {
#[inline]
unsafe fn from_raw_fd(fd: RawFd) -> net::$t {
let socket = sys::net::Socket::from_inner(fd);
net::$t::from_inner(sys_common::net::$t::from_inner(socket))
}
}
)*};
}
impl_from_raw_fd! { TcpStream TcpListener UdpSocket }
macro_rules! impl_into_raw_fd {
($($t:ident)*) => {$(
#[stable(feature = "into_raw_os", since = "1.4.0")]
impl IntoRawFd for net::$t {
#[inline]
fn into_raw_fd(self) -> RawFd {
self.into_inner().into_socket().into_inner()
}
}
)*};
}
impl_into_raw_fd! { TcpStream TcpListener UdpSocket }
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