461            int errread, int errwrite,  in child_exec()  argument
500     while (errwrite == 0 || errwrite == 1) {  in child_exec()
501         POSIX_CALL(errwrite = dup(errwrite));  in child_exec()
503         if (_Py_set_inheritable_async_safe(errwrite, 0, NULL) < 0) {  in child_exec()
525     if (errwrite == 2) {  in child_exec()
526         if (_Py_set_inheritable_async_safe(errwrite, 1, NULL) < 0)  in child_exec()
529     else if (errwrite != -1)  in child_exec()
530         POSIX_CALL(dup2(errwrite, 2));  /* stderr */  in child_exec()
660              int errread, int errwrite,  in do_fork_exec()  argument
709                errread, errwrite, errpipe_read, errpipe_write,  in do_fork_exec()
729     int p2cread, p2cwrite, c2pread, c2pwrite, errread, errwrite;  in subprocess_fork_exec()  local
751             &errread, &errwrite, &errpipe_read, &errpipe_write,  in subprocess_fork_exec()
955                        errread, errwrite, errpipe_read, errpipe_write,  in subprocess_fork_exec()