}
int copy_file(const char *from, const char *to, int flags, mode_t mode, unsigned chattr_flags) {
}
int copy_file(const char *from, const char *to, int flags, mode_t mode, unsigned chattr_flags) {
}
int copy_file_atomic(const char *from, const char *to, mode_t mode, bool replace, unsigned chattr_flags) {
}
int copy_file_atomic(const char *from, const char *to, mode_t mode, bool replace, unsigned chattr_flags) {