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linux runtime: build on hosts without SOCK_CLOEXEC - #126
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SOCK_CLOEXEC is a Linux-only socketpair flag; macOS (the dev-iteration harness for Linux hosts) lacks it, so platform/linux/runtime did not compile outside Linux. Fall back to setting FD_CLOEXEC on both ends right after the pair is created — this thread performs no I/O in between, so no descriptor can leak across an exec in that window. Verified: the BrainFuel GTK4 host now compiles, links, and runs against this runtime on macOS (arm64, libracketcs) with the same sources that CI compiles on Linux.
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Closes the compile gap found while dogfooding the Linux GTK4 host (BrainFuel rewrite) on an arm64 macOS dev machine.
SOCK_CLOEXECis a Linux-only socketpair flag;platform/linux/runtime/backend.cpptherefore did not compile outside Linux, so application teams cannot typecheck or run their Linux host locally the way the macOS and WinUI hosts allow.The fallback sets
FD_CLOEXECon both ends immediately aftersocketpairreturns; the creating thread performs no I/O orexecin between, so the no-leak guarantee is unchanged.Verification
libracketcs.a, boots the embedded backend, and completes bootstrap RPCs (same sources CI compiles on Linux).SOCK_CLOEXECpath unchanged.