Issue #27066: Fixed SystemError if a custom opener (for open()) returns
a negative number without setting an exception.
diff --git a/Modules/_io/fileio.c b/Modules/_io/fileio.c
index 83b6a32..3d41d81 100644
--- a/Modules/_io/fileio.c
+++ b/Modules/_io/fileio.c
@@ -421,7 +421,12 @@
self->fd = _PyLong_AsInt(fdobj);
Py_DECREF(fdobj);
- if (self->fd == -1) {
+ if (self->fd < 0) {
+ if (!PyErr_Occurred()) {
+ /* The opener returned -1. See issue #27066 */
+ PyErr_Format(PyExc_ValueError,
+ "opener returned %d", self->fd);
+ }
goto error;
}
}