438            int errread, int errwrite,  in child_exec()  argument
476     while (errwrite == 0 || errwrite == 1) {  in child_exec()
477         POSIX_CALL(errwrite = dup(errwrite));  in child_exec()
479         if (_Py_set_inheritable_async_safe(errwrite, 0, NULL) < 0) {  in child_exec()
501     if (errwrite == 2) {  in child_exec()
502         if (_Py_set_inheritable_async_safe(errwrite, 1, NULL) < 0)  in child_exec()
505     else if (errwrite != -1)  in child_exec()
506         POSIX_CALL(dup2(errwrite, 2));  /* stderr */  in child_exec()
622     int p2cread, p2cwrite, c2pread, c2pwrite, errread, errwrite;  in subprocess_fork_exec()  local
644             &errread, &errwrite, &errpipe_read, &errpipe_write,  in subprocess_fork_exec()
867                    errread, errwrite, errpipe_read, errpipe_write,  in subprocess_fork_exec()