[libc] Move linux signal mask helpers into OSUtil/sigmask.h (#232647)
Move internal signal set and mask helpers (full_set, empty_set, add,
remove, block_all, set_mask, etc.) out of signal_utils.h and into a new
src/__support/OSUtil/linux/sigmask.h header under the signals namespace.
This allows other low-level OS utilities and entrypoints to manipulate
signal masks without pulling in signal_utils.h (defined under
src/signal).
The rest of signal_utils.h should also move, but I'm leaving that for a
separate PR (and a separate file) because the rest of the file has more
dependencies (RwLock, vdso, __restore_rt), and interacts with more
components.
Along with the move:
- fix full_set() on 32-bit systems: sigset_t{{-1UL}} only set the first
word, leaving real-time signals unmasked. Now we loop over __signals.
- rename the helpers to shorter names within the signals namespace
(add_signal -> add, delete_signal -> remove, restore_signals ->
set_mask, etc.) and update existing callers in signal_utils,
abort_utils, sigaddset, sigdelset, sigemptyset, and sigfillset.
- add block and get_mask helpers and migrate call sites in
sigsetjmp_epilogue and system.
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.