bpo-42971: Add errno.EQFULL (macOS) (GH-24419)

Co-authored-by: Łukasz Langa <[email protected]>

Author: ronaldoussoren

Doc/library/errno.rst

@@ -637,3 +637,8 @@ defined by the module.  The specific list of defined symbols is available as
 
    Quota exceeded
 
+.. data:: EQFULL
+
+   Interface output queue is full
+
+   .. versionadded:: 3.11

Misc/NEWS.d/next/Library/2021-02-02-20-11-14.bpo-42971.OpVoFu.rst

@@ -0,0 +1,2 @@
+Add definition of ``errno.EQFULL`` for platforms that define this constant
+(such as macOS).

Modules/errnomodule.c

@@ -920,6 +920,9 @@ errno_exec(PyObject *module)
 #ifdef ESHLIBVERS
     add_errcode("ESHLIBVERS", ESHLIBVERS, "Shared library version mismatch");
 #endif
+#ifdef EQFULL
+    add_errcode("EQFULL", EQFULL, "Interface output queue is full");
+#endif
 
     Py_DECREF(error_dict);
     return 0;