package libpod import ( "fmt" "io/ioutil" "path/filepath" "strings" "github.com/pkg/errors" "github.com/projectatomic/libpod/utils" "github.com/sirupsen/logrus" ) // GetContainerPids reads sysfs to obtain the pids associated with the container's cgroup // and uses locking func (c *Container) GetContainerPids() ([]string, error) { c.lock.Lock() defer c.lock.Unlock() if err := c.syncContainer(); err != nil { return []string{}, errors.Wrapf(err, "error updating container %s state", c.ID()) } return c.getContainerPids() } // Gets the pids for a container without locking. should only be called from a func where // locking has already been established. func (c *Container) getContainerPids() ([]string, error) { taskFile := filepath.Join("/sys/fs/cgroup/pids", c.config.CgroupParent, fmt.Sprintf("libpod-conmon-%s", c.ID()), c.ID(), "tasks") logrus.Debug("reading pids from ", taskFile) content, err := ioutil.ReadFile(taskFile) if err != nil { return []string{}, errors.Wrapf(err, "unable to read pids from %s", taskFile) } return strings.Fields(string(content)), nil } // GetContainerPidInformation calls ps with the appropriate options and returns // the results as a string func (c *Container) GetContainerPidInformation(args []string) ([]string, error) { c.lock.Lock() defer c.lock.Unlock() if err := c.syncContainer(); err != nil { return []string{}, errors.Wrapf(err, "error updating container %s state", c.ID()) } pids, err := c.getContainerPids() if err != nil { return []string{}, errors.Wrapf(err, "unable to obtain pids for ", c.ID()) } args = append(args, "-p", strings.Join(pids, ",")) logrus.Debug("Executing: ", strings.Join(args, " ")) results, err := utils.ExecCmd("ps", args...) if err != nil { return []string{}, errors.Wrapf(err, "unable to obtain information about pids") } return strings.Split(results, "\n"), nil }