diff -ru python-3.14.7/Modules/posixmodule.c python-3.14.7-banan_os/Modules/posixmodule.c
--- python-3.14.7/Modules/posixmodule.c	2026-08-05 13:29:49.000000000 +0300
+++ python-3.14.7-banan_os/Modules/posixmodule.c	2026-08-25 12:39:57.421224835 +0300
@@ -15351,11 +15351,19 @@
 os_eventfd_read_impl(PyObject *module, int fd)
 /*[clinic end generated code: output=8f2c7b59a3521fd1 input=110f8b57fa596afe]*/
 {
+#ifndef __banan_os__
     eventfd_t value;
+#else
+	uint64_t value;
+#endif
     int result;
     Py_BEGIN_ALLOW_THREADS
+#ifndef __banan_os__
     result = eventfd_read(fd, &value);
-    Py_END_ALLOW_THREADS
+#else
+	result = (read(fd, &value, sizeof(value)) == sizeof(value)) ? 0 : -1;
+#endif
+	Py_END_ALLOW_THREADS
     if (result == -1) {
         return PyErr_SetFromErrno(PyExc_OSError);
     }
@@ -15377,7 +15385,11 @@
 {
     int result;
     Py_BEGIN_ALLOW_THREADS
+#ifndef __banan_os__
     result = eventfd_write(fd, value);
+#else
+	result = (write(fd, &value, sizeof(value)) == sizeof(value)) ? 0 : -1;
+#endif
     Py_END_ALLOW_THREADS
     if (result == -1) {
         return PyErr_SetFromErrno(PyExc_OSError);