llvm/llvm-project

Check the ordering of the *at syscalls

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#195,620 opened on May 4, 2026

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 (7 comments) (0 reactions) (1 assignee)C++ (10,782 forks)batch import
good first issuelibc

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Description

In our syscalls in LLVM libc, we often have clauses like:

#ifdef SYS_mkdir
#elif SYS_mkdirat
#endif

I want to check if we should be preferring the *at syscalls on systems that have both as I think they're newer and preferred.

Contributor guide

Research direction
Review the syscall macro definitions in LLVM libc to determine if *at syscalls should be preferred over their non at counterparts when both are available, based on modern Linux practice.
Tech stack
cpp
Domain
backend
Issue type
Research
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
C++Linux
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70