-void print_login_issue(const char *issue_file, const char *tty);
-void print_login_prompt(void);
+extern void print_login_issue(const char *issue_file, const char *tty);
+extern void print_login_prompt(void);
+
+extern void vfork_daemon_rexec(int argc, char **argv, char *foreground_opt);
+extern void get_terminal_width_height(int fd, int *width, int *height);
+extern unsigned long get_ug_id(const char *s, long (*my_getxxnam)(const char *));
+extern void xregcomp(regex_t *preg, const char *regex, int cflags);
+
+#define HASH_SHA1 1
+#define HASH_MD5 2
+extern int hash_fd(int fd, const off_t size, const uint8_t hash_algo, uint8_t *hashval);