See: POSIX compliance
I usually run the open-posix-testsuite in which Haiku is near successful completion. I’ll try this newer test method.
Haiku R1B5 (hrev59304) x64
- Overall: 89% (3331/3712)
- basic: 94% (332/353)
- include: 91% (2751/2995)
- io: 40% (22/55)
- limits: 95% (38/40)
- malloc: 100% (3/3)
- namespace: 20% (14/70)
- process: 100% (20/20)
- pty: 65% (19/29)
- signal: 100% (31/31)
- stdio: 100% (7/7)
- udp: 86% (94/109)
NOTE: Updated - Jan 10, 2026