bool valid_user_field(const char *p, size_t l, bool allow_protected);
-void server_process_native_message(Server *s, const void *buffer, size_t buffer_size, struct ucred *ucred, struct timeval *tv, const char *label, size_t label_len);
+void server_process_native_message(Server *s, const void *buffer, size_t buffer_size, const struct ucred *ucred, const struct timeval *tv, const char *label, size_t label_len);
-void server_process_native_file(Server *s, int fd, struct ucred *ucred, struct timeval *tv, const char *label, size_t label_len);
+void server_process_native_file(Server *s, int fd, const struct ucred *ucred, const struct timeval *tv, const char *label, size_t label_len);
int server_open_native_socket(Server*s);