Typedefs starting with `o' in bsd/hfs

• OptionBits bsd/hfs/hfs_macos_defs.h:318
• OSErr bsd/hfs/hfs_macos_defs.h:308
• OSStatus bsd/hfs/hfs_macos_defs.h:309
• OSType bsd/hfs/hfs_macos_defs.h:325
• OSTypePtr bsd/hfs/hfs_macos_defs.h:327