Issue #22821: Fixed fcntl() with integer argument on 64-bit big-endian

platforms.

Misc/NEWS

@@ -36,6 +36,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #22821: Fixed fcntl() with integer argument on 64-bit big-endian
+  platforms.
+
 - Issues #814253, #9179: Group references and conditional group references now
   work in lookbehind assertions in regular expressions.
 

Modules/fcntlmodule.c

@@ -34,7 +34,7 @@ fcntl_fcntl(PyObject *self, PyObject *args)
 {
     int fd;
     int code;
-    long arg;
+    int arg;
     int ret;
     char *str;
     Py_ssize_t len;
@@ -61,7 +61,7 @@ fcntl_fcntl(PyObject *self, PyObject *args)
     PyErr_Clear();
     arg = 0;
     if (!PyArg_ParseTuple(args,
-         "O&i|l;fcntl requires a file or file descriptor,"
+         "O&i|I;fcntl requires a file or file descriptor,"
          " an integer and optionally a third integer or a string",
                           conv_descriptor, &fd, &code, &arg)) {
       return NULL;