-int sys_write_1 (int fildes, CONST void *buf, size_t nbyte,
- int allow_quit);
-int sys_read_1 (int fildes, void *buf, size_t nbyte,
- int allow_quit);
+ssize_t sys_write_1 (int fildes, const void *buf, size_t nbyte,
+ int allow_quit);
+ssize_t sys_read_1 (int fildes, void *buf, size_t nbyte,
+ int allow_quit);