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Add comments for error cases in status functions 

Signed-off-by: Qiang Huang <h.huangqiang@huawei.com>
This commit is contained in:
Qiang Huang 2016-05-16 18:24:07 +08:00
parent c6a791bef9
commit b6e23f8166
1 changed files with 4 additions and 0 deletions
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4
libcontainer/container_linux.go
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@ -1044,6 +1044,9 @@ func (c *linuxContainer) isRunning() (bool, error) {
// return Running if the init process is alive
if err := syscall.Kill(c.initProcess.pid(), 0); err != nil {
if err == syscall.ESRCH {
// It means the process does not exist anymore, could happen when the
// process exited just when we call the function, we should not return
// error in this case.
return false, nil
}
return false, newSystemErrorWithCausef(err, "sending signal 0 to pid %d", c.initProcess.pid())
@ -1054,6 +1057,7 @@ func (c *linuxContainer) isRunning() (bool, error) {
func (c *linuxContainer) isPaused() (bool, error) {
data, err := ioutil.ReadFile(filepath.Join(c.cgroupManager.GetPaths()["freezer"], "freezer.state"))
if err != nil {
// If freezer cgroup is not mounted, the container would just be not paused.
if os.IsNotExist(err) {
return false, nil
}