-int daemon(int, int);
-int dn_expand(const u_char *, const u_char *, const u_char *, char *, int);
-int dn_skipname(const u_char *, const u_char *);
-int flock(int, int);
-int getdtablesize(void);
-int gethostname(char *, int);
-int getpagesize(void);
-char *getusershell(void);
-char *getwd(char *);
-int iruserok(u_int, int, char *, char *);
-#ifdef __STDC__
-struct utmp;
-void login(struct utmp *);
-#endif
-int logout(const char *);
-int res_query(const char *, int, int, u_char *, int);
-int setenv(const char *, const char *, int);