[libc] Remove legacy SYS_socketcall fallbacks (#197189) This patch removes legacy SYS_socketcall fallback paths from all Linux socket entry points. The individual syscall entry points were [added](https://github.com/torvalds/linux/commit/9dea5dc921b5f4045a18c63eb92e84dc274d17eb) in linux 4.3 (on x86, other architectures have had them even sooner). Our policy is to support the lowest kernel version on https://kernel.org/, which is 5.10 as of this writing. This is motivated by the problems in [testing](https://github.com/llvm/llvm-project/pull/196903#pullrequestreview-4263553670) the fallback paths -- to make sure this even builds, one needs to get a hold of very old kernel headers, or otherwise hack its build to force it to select the fallback path. New ABIs don't have the accept syscall (only accept4), so I've added an accept->accept4 fallback. Assisted by Gemini.
Welcome to the LLVM project!
This repository contains the source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and run-time environments.
The LLVM project has multiple components. The core of the project is itself called “LLVM”. This contains all of the tools, libraries, and header files needed to process intermediate representations and convert them into object files. Tools include an assembler, disassembler, bitcode analyzer, and bitcode optimizer.
C-like languages use the Clang frontend. This component compiles C, C++, Objective-C, and Objective-C++ code into LLVM bitcode -- and from there into object files, using LLVM.
Other components include: the libc++ C++ standard library, the LLD linker, and more.
Consult the Getting Started with LLVM page for information on building and running LLVM.
For information on how to contribute to the LLVM project, please take a look at the Contributing to LLVM guide.
Join the LLVM Discourse forums, Discord chat, LLVM Office Hours or Regular sync-ups.
The LLVM project has adopted a code of conduct for participants to all modes of communication within the project.