3fc5ed8067
Adding support of quirky filesystems occuring in virtualised settings not having full POSIX support for memory mapped files. Example: current virtiofs with cache disabled, occuring in Incus/LXD or Kata Containers. Has been hitting various virtualised filesystems since 2016, depending on their levels of maturity at the time. The situation will perhaps improve when virtiofs DAX support patches will have made it into the qemu mainline. On a reliability level, using the MAP_PRIVATE sycall flag instead of the MAP_SHARED syscall flag for the mmap() system call does have some undefined behaviour when the caller update the memory mapping of the mmap()ed file, but MAP_SHARED does allow not only the calling process but other processes to modify the memory mapping. Thus, in the current context, using MAP_PRIVATE copy-on-write is marginally more reliable than MAP_SHARED. This discussion of reliability is orthogonal to the type system enforced safety policy of rust, which does not claim to handle memory modification of memory mapped files triggered through the operating system and not the running rust process. |
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The Rust Programming Language
This is the main source code repository for Rust. It contains the compiler, standard library, and documentation.
Note: this README is for users rather than contributors. If you wish to contribute to the compiler, you should read CONTRIBUTING.md instead.
Table of Contents
Quick Start
Read "Installation" from The Book.
Installing from Source
If you really want to install from source (though this is not recommended), see INSTALL.md.
Getting Help
See https://www.rust-lang.org/community for a list of chat platforms and forums.
Contributing
See CONTRIBUTING.md.
License
Rust is primarily distributed under the terms of both the MIT license and the Apache License (Version 2.0), with portions covered by various BSD-like licenses.
See LICENSE-APACHE, LICENSE-MIT, and COPYRIGHT for details.
Trademark
The Rust Foundation owns and protects the Rust and Cargo trademarks and logos (the "Rust Trademarks").
If you want to use these names or brands, please read the media guide.
Third-party logos may be subject to third-party copyrights and trademarks. See Licenses for details.