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Jeong, YunWon
a635d0b536
`socket.sethostname` took `PyUtf8StrRef`, so it rejected `bytes` outright and refused a `str` carrying a surrogate escape. `socketmodule.c socket_sethostname` accepts a bytes object directly, falls back to `PyUnicode_FSConverter` for anything else, and hands the syscall the resulting buffer and its length — the name is never required to be UTF-8. Take `FsPath`, the converter `if_nametoindex` in this same module already uses, and pass its bytes down. `host_env::socket::sethostname` correspondingly takes `&[u8]` and builds the `OsStr` from them; `nix::unistd::sethostname` accepts `AsRef<OsStr>` and passes pointer and length to the syscall, so nothing on the path needs a NUL terminator or valid UTF-8. `Lib/test/test_socket.py test_sethostname` covers this: it calls `socket.sethostname(b'bar')` and asserts the hostname changed. The test is skipped unless run as root, which is why the gap went unnoticed. Assisted-by: Claude