int chattr_fd(int fd, bool b, unsigned mask);
int chattr_path(const char *p, bool b, unsigned mask);
int change_attr_fd(int fd, unsigned value, unsigned mask);
int chattr_fd(int fd, bool b, unsigned mask);
int chattr_path(const char *p, bool b, unsigned mask);
int change_attr_fd(int fd, unsigned value, unsigned mask);