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// Licensed to the Apache Software Foundation (ASF) under one // or more contributor license agreements. See the NOTICE file // distributed with this work for additional information // regarding copyright ownership. The ASF licenses this file // to you under the Apache License, Version 2.0 (the // "License"); you may not use this file except in compliance // with the License. You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, // software distributed under the License is distributed on an // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY // KIND, either express or implied. See the License for the // specific language governing permissions and limitations // under the License.. //! Unix-specific extensions to general I/O primitives use sgx_trts::libc; #[cfg(feature = "untrusted_fs")] use crate::fs; #[cfg(not(feature = "untrusted_fs"))] use crate::untrusted::fs; use crate::os::raw; use crate::sys; use crate::io; use crate::sys_common::{AsInner, FromInner, IntoInner}; /// Raw file descriptors. pub type RawFd = raw::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() } } #[cfg(feature = "stdio")] impl AsRawFd for io::Stdin { fn as_raw_fd(&self) -> RawFd { libc::STDIN_FILENO } } #[cfg(feature = "stdio")] impl AsRawFd for io::Stdout { fn as_raw_fd(&self) -> RawFd { libc::STDOUT_FILENO } } #[cfg(feature = "stdio")] impl AsRawFd for io::Stderr { fn as_raw_fd(&self) -> RawFd { libc::STDERR_FILENO } } #[cfg(feature = "stdio")] impl<'a> AsRawFd for io::StdinLock<'a> { fn as_raw_fd(&self) -> RawFd { libc::STDIN_FILENO } } #[cfg(feature = "stdio")] impl<'a> AsRawFd for io::StdoutLock<'a> { fn as_raw_fd(&self) -> RawFd { libc::STDOUT_FILENO } } #[cfg(feature = "stdio")] impl<'a> AsRawFd for io::StderrLock<'a> { fn as_raw_fd(&self) -> RawFd { libc::STDERR_FILENO } }