path__join
path__join(group_name, sizeof(group_name), strace_groups_dir, s);
path__join(dirbuf, PATH_MAX, root_dir, dirname);
int path__join(char *bf, size_t size, const char *path1, const char *path2);
path__join(prefixed_raw_path, sizeof(prefixed_raw_path), comp_dir, raw_path);
return path__join(bf, size, symbol_conf.symfs, path);