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//! WASI-specific extensions to general I/O primitives
#![unstable(feature = "wasi_ext", issue = "0")]
use crate::fs;
use crate::io;
use crate::sys;
use crate::sys_common::{AsInner, FromInner, IntoInner};
/// Raw file descriptors.
pub type RawFd = u32;
/// A trait to extract the raw WASI 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;
}
impl AsRawFd for fs::File {
fn as_raw_fd(&self) -> RawFd {
self.as_inner().fd().as_raw()
}
}
impl FromRawFd for fs::File {
unsafe fn from_raw_fd(fd: RawFd) -> fs::File {
fs::File::from_inner(sys::fs::File::from_inner(fd))
}
}
impl IntoRawFd for fs::File {
fn into_raw_fd(self) -> RawFd {
self.into_inner().into_fd().into_raw()
}
}
impl AsRawFd for io::Stdin {
fn as_raw_fd(&self) -> RawFd {
libc::STDIN_FILENO as u32
}
}
impl AsRawFd for io::Stdout {
fn as_raw_fd(&self) -> RawFd {
libc::STDOUT_FILENO as u32
}
}
impl AsRawFd for io::Stderr {
fn as_raw_fd(&self) -> RawFd {
libc::STDERR_FILENO as u32
}
}
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