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Future proof use of SOCK_CLOEXEC #961

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opened 2025-08-16 15:28:27 +00:00 by helle · 0 comments
helle commented 2025-08-16 15:28:27 +00:00
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For both the new use of SOCK_CLOEXEC and the use of it now for pipes needs to be updated to have runtime checks, with fallback. As even if SOCK_CLOEXEC is available at build time, it may not be available at runtime.

This due to us supporting running newer build binaries being run on older OS'es and the POSIX spec for it allowing it to be defined, but unimplemented at runtime.

Currently we would see very weird breakages if this situation occurs, which is not entirely unlikely and the runtime check is not on the hot path.

For both the new use of SOCK_CLOEXEC and the use of it now for pipes needs to be updated to have runtime checks, with fallback. As even if SOCK_CLOEXEC is available at build time, it may not be available at runtime. This due to us supporting running newer build binaries being run on older OS'es and the POSIX spec for it allowing it to be defined, but unimplemented at runtime. Currently we would see very weird breakages if this situation occurs, which is not entirely unlikely and the runtime check is not on the hot path.
helle self-assigned this 2025-08-16 15:28:27 +00:00
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Reference: lix-project/lix#961
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