Confirming Justin on an older OS X:


$ uname -a

Darwin GC06259 15.6.0 Darwin Kernel Version 15.6.0: Mon Nov 13 21:58:35 PST 
2017; root:xnu-3248.72.11~1/RELEASE_X86_64 x86_64


$ gcc forksigaltstack.c -o forksigaltstack && ./forksigaltstack

status = 4

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