sysdecode_msg_flags
bool sysdecode_msg_flags(FILE *_fp, int _flags, int *_rem);
print_mask_arg0(sysdecode_msg_flags, *ip);
print_mask_arg0(sysdecode_msg_flags, *ip);
print_mask_arg(sysdecode_msg_flags, fp, args[sc->offset]);
print_mask_arg(sysdecode_msg_flags, fp, msghdr.msg_flags);