Add NSpid to proc status (#557)

* Add NSpid to proc status

Signed-off-by: Nir Levy <[email protected]>

* Support NSpid with 2 pids

Signed-off-by: Nir Levy <[email protected]>

* Support list of nspids

Signed-off-by: Nir Levy <[email protected]>

---------

Signed-off-by: Nir Levy <[email protected]>

Author: NirLevy98

proc_status.go

@@ -32,6 +32,8 @@ type ProcStatus struct {
 
 	// Thread group ID.
 	TGID int
+	// List of Pid namespace.
+	NSpids []uint64
 
 	// Peak virtual memory size.
 	VmPeak uint64 // nolint:revive
@@ -127,6 +129,8 @@ func (s *ProcStatus) fillStatus(k string, vString string, vUint uint64, vUintByt
 		copy(s.UIDs[:], strings.Split(vString, "\t"))
 	case "Gid":
 		copy(s.GIDs[:], strings.Split(vString, "\t"))
+	case "NSpid":
+		s.NSpids = calcNSPidsList(vString)
 	case "VmPeak":
 		s.VmPeak = vUintBytes
 	case "VmSize":
@@ -200,3 +204,18 @@ func calcCpusAllowedList(cpuString string) []uint64 {
 	sort.Slice(g, func(i, j int) bool { return g[i] < g[j] })
 	return g
 }
+
+func calcNSPidsList(nspidsString string) []uint64 {
+	s := strings.Split(nspidsString, " ")
+	var nspids []uint64
+
+	for _, nspid := range s {
+		nspid, _ := strconv.ParseUint(nspid, 10, 64)
+		if nspid == 0 {
+			continue
+		}
+		nspids = append(nspids, nspid)
+	}
+
+	return nspids
+}

proc_status_test.go

@@ -36,6 +36,7 @@ func TestProcStatus(t *testing.T) {
 	}{
 		{name: "Pid", want: 26231, have: s.PID},
 		{name: "Tgid", want: 26231, have: s.TGID},
+		{name: "NSpid", want: 1, have: int(s.NSpids[0])},
 		{name: "VmPeak", want: 58472 * 1024, have: int(s.VmPeak)},
 		{name: "VmSize", want: 58440 * 1024, have: int(s.VmSize)},
 		{name: "VmLck", want: 0 * 1024, have: int(s.VmLck)},