+extern const char * const can_not_create_raw_socket;
+extern const char * const nologin_file;
+extern const char * const passwd_file;
+extern const char * const shadow_file;
+extern const char * const gshadow_file;
+extern const char * const group_file;
+extern const char * const securetty_file;
+extern const char * const motd_file;
+extern const char * const issue_file;
+extern const char * const _path_login;
+
+#ifdef CONFIG_FEATURE_DEVFS
+# define CURRENT_VC "/dev/vc/0"
+# define VC_1 "/dev/vc/1"
+# define VC_2 "/dev/vc/2"
+# define VC_3 "/dev/vc/3"
+# define VC_4 "/dev/vc/4"
+# define VC_5 "/dev/vc/5"
+# define SC_0 "/dev/tts/0"
+# define SC_1 "/dev/tts/1"
+# define VC_FORMAT "/dev/vc/%d"
+# define SC_FORMAT "/dev/tts/%d"
+# define LOOP_FORMAT "/dev/loop/%d"
+#else
+# define CURRENT_VC "/dev/tty0"
+# define VC_1 "/dev/tty1"
+# define VC_2 "/dev/tty2"
+# define VC_3 "/dev/tty3"
+# define VC_4 "/dev/tty4"
+# define VC_5 "/dev/tty5"
+# define SC_0 "/dev/ttyS0"
+# define SC_1 "/dev/ttyS1"
+# define VC_FORMAT "/dev/tty%d"
+# define SC_FORMAT "/dev/ttyS%d"
+# define LOOP_FORMAT "/dev/loop%d"
+#endif
+
+/* The following devices are the same on devfs and non-devfs systems. */
+#define CURRENT_TTY "/dev/tty"
+#define CONSOLE_DEV "/dev/console"
+
+int is_in_ino_dev_hashtable(const struct stat *statbuf, char **name);
+void add_to_ino_dev_hashtable(const struct stat *statbuf, const char *name);
+void reset_ino_dev_hashtable(void);
+
+/* Stupid gcc always includes its own builtin strlen()... */
+extern size_t xstrlen(const char *string);
+#define strlen(x) xstrlen(x)
+
+void bb_asprintf(char **string_ptr, const char *format, ...) __attribute__ ((format (printf, 2, 3)));
+
+
+#define FAIL_DELAY 3
+extern void change_identity ( const struct passwd *pw );
+extern void run_shell ( const char *shell, int loginshell, const char *command, const char **additional_args );
+extern int restricted_shell ( const char *shell );
+extern void setup_environment ( const char *shell, int loginshell, int changeenv, const struct passwd *pw );
+extern int correct_password ( const struct passwd *pw );
+extern char *pw_encrypt(const char *clear, const char *salt);
+extern struct spwd *pwd_to_spwd(const struct passwd *pw);
+extern int obscure(const char *old, const char *newval, const struct passwd *pwdp);