(safe_read): New decl.

lib/safe-read.h

@@ -6,5 +6,5 @@
 # endif
 #endif
 
-ssize_t
-safe_read PARAMS ((int desc, void *ptr, size_t len));
+ssize_t full_write PARAMS ((int desc, const char *ptr, size_t len));
+ssize_t safe_read PARAMS ((int desc, void *ptr, size_t len));