fix: add uclibc MIPS signal flags compatibility #2671
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asomers requested changes Sep 15, 2025
MIPS uclibc defines sa_flags as unsigned int instead of int, causing type mismatches. This adds conditional compilation to use the correct type (c_uint) for MIPS uclibc while maintaining compatibility with other platforms. Fixes signal handling on old uclibc systems (0.9.x series) commonly found on embedded MIPS devices.
batkovic75 force-pushed the fix-uclibc-signal-flags branch from 5fa15dc to b5a1db1 Compare 
| Sure, I added changelog/2671.fixed.md changelog entry following doc at CONTRIBUTING.md#pull-requests |
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I open this PR to fix signal handling compatibility for MIPS uclibc systems by addressing type mismatches in
sa_flags.MIPS uclibc (version 0.9.x series that can be found on some embedded devices) defines
sa_flagsasunsigned intinstead of the standardint, causing compilation failures when building nix on these systems.Changes
src/sys/signal.rsto uselibc::c_uintforSaFlags_ttype on MIPS with uclibclibc_bitflags!macro for MIPS uclibc compatibilityTesting
src/sys/statfs.rsuclibc handling)Note: No API changes, this is purely a compatibility fix for existing signal handling functionality. The public
API remains identical on all platforms.