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What is going on in Unix with errno's limited nature

13 ingve 4 7/4/2025, 6:25:11 AM utcc.utoronto.ca ↗

Comments (4)

amelius · 12h ago

Why didn't they mention threads?

bartvk · 10h ago

Oh gosh, that's interesting. I bet that complicates using using errno. Or is errno somehow copied into a local variable?

Vogtinator · 10h ago

errno is in thread-local storage (TLS)

amelius · 10h ago

Yes. It is too bad that they didn't use a similar solution for the current working directory. Chdir() is process-wide, not thread local :(