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// Copyright 2018 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package procfs
import (
"bytes"
"strconv"
"strings"
"github.com/prometheus/procfs/internal/util"
)
// ProcStatus provides status information about the process,
// read from /proc/[pid]/stat.
type ProcStatus struct {
// The process ID.
PID int
// The process name.
Name string
// Thread group ID.
TGID int
// Peak virtual memory size.
VmPeak uint64 // nolint:golint
// Virtual memory size.
VmSize uint64 // nolint:golint
// Locked memory size.
VmLck uint64 // nolint:golint
// Pinned memory size.
VmPin uint64 // nolint:golint
// Peak resident set size.
VmHWM uint64 // nolint:golint
// Resident set size (sum of RssAnnon RssFile and RssShmem).
VmRSS uint64 // nolint:golint
// Size of resident anonymous memory.
RssAnon uint64 // nolint:golint
// Size of resident file mappings.
RssFile uint64 // nolint:golint
// Size of resident shared memory.
RssShmem uint64 // nolint:golint
// Size of data segments.
VmData uint64 // nolint:golint
// Size of stack segments.
VmStk uint64 // nolint:golint
// Size of text segments.
VmExe uint64 // nolint:golint
// Shared library code size.
VmLib uint64 // nolint:golint
// Page table entries size.
VmPTE uint64 // nolint:golint
// Size of second-level page tables.
VmPMD uint64 // nolint:golint
// Swapped-out virtual memory size by anonymous private.
VmSwap uint64 // nolint:golint
// Size of hugetlb memory portions
HugetlbPages uint64
// Number of voluntary context switches.
VoluntaryCtxtSwitches uint64
// Number of involuntary context switches.
NonVoluntaryCtxtSwitches uint64
// UIDs of the process (Real, effective, saved set, and filesystem UIDs)
UIDs [4]string
// GIDs of the process (Real, effective, saved set, and filesystem GIDs)
GIDs [4]string
}
// NewStatus returns the current status information of the process.
func (p Proc) NewStatus() (ProcStatus, error) {
data, err := util.ReadFileNoStat(p.path("status"))
if err != nil {
return ProcStatus{}, err
}
s := ProcStatus{PID: p.PID}
lines := strings.Split(string(data), "\n")
for _, line := range lines {
if !bytes.Contains([]byte(line), []byte(":")) {
continue
}
kv := strings.SplitN(line, ":", 2)
// removes spaces
k := string(strings.TrimSpace(kv[0]))
v := string(strings.TrimSpace(kv[1]))
// removes "kB"
v = string(bytes.Trim([]byte(v), " kB"))
// value to int when possible
// we can skip error check here, 'cause vKBytes is not used when value is a string
vKBytes, _ := strconv.ParseUint(v, 10, 64)
// convert kB to B
vBytes := vKBytes * 1024
s.fillStatus(k, v, vKBytes, vBytes)
}
return s, nil
}
func (s *ProcStatus) fillStatus(k string, vString string, vUint uint64, vUintBytes uint64) {
switch k {
case "Tgid":
s.TGID = int(vUint)
case "Name":
s.Name = vString
case "Uid":
copy(s.UIDs[:], strings.Split(vString, "\t"))
case "Gid":
copy(s.GIDs[:], strings.Split(vString, "\t"))
case "VmPeak":
s.VmPeak = vUintBytes
case "VmSize":
s.VmSize = vUintBytes
case "VmLck":
s.VmLck = vUintBytes
case "VmPin":
s.VmPin = vUintBytes
case "VmHWM":
s.VmHWM = vUintBytes
case "VmRSS":
s.VmRSS = vUintBytes
case "RssAnon":
s.RssAnon = vUintBytes
case "RssFile":
s.RssFile = vUintBytes
case "RssShmem":
s.RssShmem = vUintBytes
case "VmData":
s.VmData = vUintBytes
case "VmStk":
s.VmStk = vUintBytes
case "VmExe":
s.VmExe = vUintBytes
case "VmLib":
s.VmLib = vUintBytes
case "VmPTE":
s.VmPTE = vUintBytes
case "VmPMD":
s.VmPMD = vUintBytes
case "VmSwap":
s.VmSwap = vUintBytes
case "HugetlbPages":
s.HugetlbPages = vUintBytes
case "voluntary_ctxt_switches":
s.VoluntaryCtxtSwitches = vUint
case "nonvoluntary_ctxt_switches":
s.NonVoluntaryCtxtSwitches = vUint
}
}
// TotalCtxtSwitches returns the total context switch.
func (s ProcStatus) TotalCtxtSwitches() uint64 {
return s.VoluntaryCtxtSwitches + s.NonVoluntaryCtxtSwitches
}
