-void clearerr_unlocked(FILE *stream);
-int feof_unlocked(FILE *stream);
-int ferror_unlocked(FILE *stream);
-int fileno_unlocked(FILE *stream);
-int fflush_unlocked(FILE *stream);
-int fgetc_unlocked(FILE *stream);
-int fputc_unlocked(int c, FILE *stream);
-size_t fread_unlocked(void *ptr, size_t size, size_t n, FILE *stream);
-size_t fwrite_unlocked(const void *ptr, size_t size, size_t n, FILE *stream);
+void clearerr_unlocked(FILE *stream) _PDCLIB_nothrow;
+int feof_unlocked(FILE *stream) _PDCLIB_nothrow;
+int ferror_unlocked(FILE *stream) _PDCLIB_nothrow;
+int fflush_unlocked(FILE *stream) _PDCLIB_nothrow;
+int fgetc_unlocked(FILE *stream) _PDCLIB_nothrow;
+int fputc_unlocked(int c, FILE *stream) _PDCLIB_nothrow;
+size_t fread_unlocked(void *ptr, size_t size, size_t n, FILE *stream) _PDCLIB_nothrow;
+size_t fwrite_unlocked(const void *ptr, size_t size, size_t n, FILE *stream) _PDCLIB_nothrow;