https://github.com/python/cpython/pull/138201

--- Python-3.14.0/Modules/posixmodule.c.orig
+++ Python-3.14.0/Modules/posixmodule.c
@@ -8189,7 +8189,11 @@
     int max;
 
     max = sched_get_priority_max(policy);
+#ifdef __sun
+    if (max == -1 && errno == EINVAL)
+#else
     if (max < 0)
+#endif
         return posix_error();
     return PyLong_FromLong(max);
 }
@@ -8208,7 +8212,11 @@
 /*[clinic end generated code: output=7595c1138cc47a6d input=21bc8fa0d70983bf]*/
 {
     int min = sched_get_priority_min(policy);
+#ifdef __sun
+    if (min == -1 && errno == EINVAL)
+#else
     if (min < 0)
+#endif
         return posix_error();
     return PyLong_FromLong(min);
 }