-int usleep(useconds_t);
-useconds_t ualarm(useconds_t, useconds_t);
-int setgroups(int, const gid_t []);
+int getdomainname(char *, size_t);
+int setdomainname(const char *, size_t);
+int setgroups(size_t, const gid_t *);
+char *getpass(const char *);
+int daemon(int, int);
+void setusershell(void);
+void endusershell(void);
+char *getusershell(void);
+int acct(const char *);
+long syscall(long, ...);
+int execvpe(const char *, char *const [], char *const []);
+#endif
+
+#ifdef _GNU_SOURCE
+extern char **environ;
+int setresuid(uid_t, uid_t, uid_t);
+int setresgid(gid_t, gid_t, gid_t);
+int getresuid(uid_t *, uid_t *, uid_t *);
+int getresgid(gid_t *, gid_t *, gid_t *);
+char *get_current_dir_name(void);
+void syncfs(int);
+int euidaccess(const char *, int);
+int eaccess(const char *, int);