libct/cg: move GetAllPids out of utils.go

This is just moving the code around to ease the code review, no other
changes.

Signed-off-by: Kir Kolyshkin <[email protected]>

Author: kolyshkin

libcontainer/cgroups/getallpids.go

@@ -0,0 +1,30 @@
+// +build linux
+
+package cgroups
+
+import (
+	"os"
+	"path/filepath"
+)
+
+// GetAllPids returns all pids, that were added to cgroup at path and to all its
+// subcgroups.
+func GetAllPids(path string) ([]int, error) {
+	var pids []int
+	// collect pids from all sub-cgroups
+	err := filepath.Walk(path, func(p string, info os.FileInfo, iErr error) error {
+		if iErr != nil {
+			return iErr
+		}
+		if info.IsDir() || info.Name() != CgroupProcesses {
+			return nil
+		}
+		cPids, err := readProcsFile(p)
+		if err != nil {
+			return err
+		}
+		pids = append(pids, cPids...)
+		return nil
+	})
+	return pids, err
+}

libcontainer/cgroups/utils.go

@@ -339,28 +339,6 @@ func GetPids(dir string) ([]int, error) {
 	return readProcsFile(filepath.Join(dir, CgroupProcesses))
 }
 
-// GetAllPids returns all pids, that were added to cgroup at path and to all its
-// subcgroups.
-func GetAllPids(path string) ([]int, error) {
-	var pids []int
-	// collect pids from all sub-cgroups
-	err := filepath.Walk(path, func(p string, info os.FileInfo, iErr error) error {
-		if iErr != nil {
-			return iErr
-		}
-		if info.IsDir() || info.Name() != CgroupProcesses {
-			return nil
-		}
-		cPids, err := readProcsFile(p)
-		if err != nil {
-			return err
-		}
-		pids = append(pids, cPids...)
-		return nil
-	})
-	return pids, err
-}
-
 // WriteCgroupProc writes the specified pid into the cgroup's cgroup.procs file
 func WriteCgroupProc(dir string, pid int) error {
 	// Normally dir should not be empty, one case is that cgroup subsystem