ndless 0.8.8

Rust library for interacting with Ndless for the TI-Nspire
Documentation 
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//! Unix-specific extensions to general I/O primitives

use crate::file_io::sys;
use crate::fs;

use crate::file_io::sys_common::{AsInner, FromInner, IntoInner};
use crate::libc;
/// Raw file descriptors.

pub type RawFd = libc::c_int;

/// A trait to extract the raw unix file descriptor from an underlying
/// object.
///
/// This is only available on unix platforms and must be imported in order
/// to call the method. Windows platforms have a corresponding `AsRawHandle`
/// and `AsRawSocket` set of traits.

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().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 }
}


impl AsRawFd for io::Stdout {
	fn as_raw_fd(&self) -> RawFd { libc::STDOUT_FILENO }
}


impl AsRawFd for io::Stderr {
	fn as_raw_fd(&self) -> RawFd { libc::STDERR_FILENO }
}*/