mod_posix: Move POSIX signal handling into util.startup to avoid race
When libunbound is initialized, it spawns a thread to work in.
In case a module initializes libunbound, e.g. by triggering a s2s
connection, Prosody would not handle signals, instead immediately quit
on e.g. the reload (SIGHUP) signal. Likely because the libunbound thread
would not have inherited the signal mask from the main Prosody thread.
Thanks Menel, riau and franck-x for reporting and help narrowing down
Should pass: 41 42 43 # Simple ASCII - abc
Should pass: 41 42 c3 87 # "ABÇ"
Should pass: 41 42 e1 b8 88 # "ABḈ"
Should pass: 41 42 f0 9d 9c 8d # "AB𝜍"
Should pass: F4 8F BF BF # Last valid sequence (U+10FFFF)
Should fail: F4 90 80 80 # First invalid sequence (U+110000)
Should fail: 80 81 82 83 # Invalid sequence (invalid start byte)
Should fail: C2 C3 # Invalid sequence (invalid continuation byte)
Should fail: C0 43 # Overlong sequence
Should fail: F5 80 80 80 # U+140000 (out of range)
Should fail: ED A0 80 # U+D800 (forbidden by RFC 3629)
Should fail: ED BF BF # U+DFFF (forbidden by RFC 3629)
Should pass: ED 9F BF # U+D7FF (U+D800 minus 1: allowed)
Should pass: EE 80 80 # U+E000 (U+D7FF plus 1: allowed)
Should fail: C0 # Invalid start byte
Should fail: C1 # Invalid start byte
Should fail: C2 # Incomplete sequence
Should fail: F8 88 80 80 80 # 6-byte sequence
Should pass: 7F # Last valid 1-byte sequence (U+00007F)
Should pass: DF BF # Last valid 2-byte sequence (U+0007FF)
Should pass: EF BF BF # Last valid 3-byte sequence (U+00FFFF)
Should pass: 00 # First valid 1-byte sequence (U+000000)
Should pass: C2 80 # First valid 2-byte sequence (U+000080)
Should pass: E0 A0 80 # First valid 3-byte sequence (U+000800)
Should pass: F0 90 80 80 # First valid 4-byte sequence (U+000800)
Should fail: F8 88 80 80 80 # First 5-byte sequence - invalid per RFC 3629
Should fail: FC 84 80 80 80 80 # First 6-byte sequence - invalid per RFC 3629
Should pass: EF BF BD # U+00FFFD (replacement character)
Should fail: 80 # First continuation byte
Should fail: BF # Last continuation byte
Should fail: 80 BF # 2 continuation bytes
Should fail: 80 BF 80 # 3 continuation bytes
Should fail: 80 BF 80 BF # 4 continuation bytes
Should fail: 80 BF 80 BF 80 # 5 continuation bytes
Should fail: 80 BF 80 BF 80 BF # 6 continuation bytes
Should fail: 80 BF 80 BF 80 BF 80 # 7 continuation bytes
Should fail: FE # Impossible byte
Should fail: FF # Impossible byte
Should fail: FE FE FF FF # Impossible bytes
Should fail: C0 AF # Overlong "/"
Should fail: E0 80 AF # Overlong "/"
Should fail: F0 80 80 AF # Overlong "/"
Should fail: F8 80 80 80 AF # Overlong "/"
Should fail: FC 80 80 80 80 AF # Overlong "/"
Should fail: C0 80 AF # Overlong "/" (invalid)
Should fail: C1 BF # Overlong
Should fail: E0 9F BF # Overlong
Should fail: F0 8F BF BF # Overlong
Should fail: F8 87 BF BF BF # Overlong
Should fail: FC 83 BF BF BF BF # Overlong
Should pass: EF BF BE # U+FFFE (invalid unicode, valid UTF-8)
Should pass: EF BF BF # U+FFFF (invalid unicode, valid UTF-8)