int socket_from_display(const char *display, char **path);
int get_user_creds(const char **username, uid_t *uid, gid_t *gid, const char **home);
+int get_group_creds(const char **groupname, gid_t *gid);
int glob_exists(const char *path);
int in_search_path(const char *path, char **search);
int get_files_in_directory(const char *path, char ***list);
+char *join(const char *x, ...) _sentinel_;
+
+bool is_main_thread(void);
+
#define NULSTR_FOREACH(i, l) \
for ((i) = (l); (i) && *(i); (i) = strchr((i), 0)+1)