Typedefs starting with `o' in bsd/hfs/hfscommon/headers/system

• OptionBits bsd/hfs/hfscommon/headers/system/MacOSTypes.h:227
• OSErr bsd/hfs/hfscommon/headers/system/MacOSTypes.h:217
• OSStatus bsd/hfs/hfscommon/headers/system/MacOSTypes.h:218
• OSType bsd/hfs/hfscommon/headers/system/MacOSTypes.h:234
• OSTypePtr bsd/hfs/hfscommon/headers/system/MacOSTypes.h:236