+int getresuid(uid_t *, uid_t *, uid_t *);
+int getresgid(gid_t *, gid_t *, gid_t *);
+char *get_current_dir_name(void);
+int daemon(int, int);
+int getdomainname(char *, size_t);
+int getdtablesize(void);
+void setusershell(void);
+void endusershell(void);
+char *getusershell(void);