blob: 9d1a76a60452e97212d4d654cb47441b24390806 [file] [log] [blame]
// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package qemu
import (
// QEMUSuccessCodes encodes all possible QEMU exit codes that signify successful shutdown.
var qemuSuccessCodes = map[int]bool{
0: true,
// QEMU returns 31 to signify a graceful shutdown when running Zircon's core-tests on
// x64 architecture. It writes a value to a specially declared I/O port, which is used
// to compute the return code as `(<value> << 1) | 1` (always odd and non-zero):
// 31 is that magic return code.
31: true,
// CheckExitCode checks whether a given error encodes a successful QEMU exit code.
func CheckExitCode(err error) error {
if err == nil {
return nil
if exitErr, ok := err.(*exec.ExitError); ok {
// This works on both Unix and Windows. Although the syscall package is generally
// platform dependent, WaitStatus has a void-to-int ExitStatus() method in both cases.
if status, ok := exitErr.Sys().(syscall.WaitStatus); ok {
exitCode := status.ExitStatus()
_, ok = qemuSuccessCodes[exitCode]
if ok {
log.Printf("successful QEMU exit status: %d", exitCode)
return nil
} else {
return fmt.Errorf("unsuccessful QEMU exit status: %d", exitCode)
} else {
return fmt.Errorf("could not derive exit code from associated os.ProcessState: %v", err)
} else {
return fmt.Errorf("provided error is not of type *exec.ExitError: %v", err)