man pages section 3: Extended Library Functions

Ucred(3PERL)– Perl interface to User Credentials
uuid_clear(3UUID)– universally unique identifier (UUID) operations
uuid_compare(3UUID)– universally unique identifier (UUID) operations
uuid_copy(3UUID)– universally unique identifier (UUID) operations
uuid_generate(3UUID)– universally unique identifier (UUID) operations
uuid_generate_random(3UUID)– universally unique identifier (UUID) operations
uuid_generate_time(3UUID)– universally unique identifier (UUID) operations
uuid_is_null(3UUID)– universally unique identifier (UUID) operations
uuid_parse(3UUID)– universally unique identifier (UUID) operations
uuid_time(3UUID)– universally unique identifier (UUID) operations
uuid_unparse(3UUID)– universally unique identifier (UUID) operations