386 lines
6.9 KiB
Go
386 lines
6.9 KiB
Go
// Copyright (c) 2012 VMware, Inc.
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package sigar
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import (
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"bufio"
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"bytes"
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"io"
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"io/ioutil"
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"os"
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"strconv"
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"strings"
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"syscall"
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)
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var system struct {
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ticks uint64
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btime uint64
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}
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var Procd string
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func init() {
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system.ticks = 100 // C.sysconf(C._SC_CLK_TCK)
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Procd = "/proc"
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// grab system boot time
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readFile(Procd+"/stat", func(line string) bool {
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if strings.HasPrefix(line, "btime") {
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system.btime, _ = strtoull(line[6:])
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return false // stop reading
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}
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return true
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})
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}
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func (self *LoadAverage) Get() error {
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line, err := ioutil.ReadFile(Procd + "/loadavg")
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if err != nil {
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return nil
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}
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fields := strings.Fields(string(line))
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self.One, _ = strconv.ParseFloat(fields[0], 64)
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self.Five, _ = strconv.ParseFloat(fields[1], 64)
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self.Fifteen, _ = strconv.ParseFloat(fields[2], 64)
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return nil
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}
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func (self *Uptime) Get() error {
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sysinfo := syscall.Sysinfo_t{}
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if err := syscall.Sysinfo(&sysinfo); err != nil {
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return err
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}
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self.Length = float64(sysinfo.Uptime)
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return nil
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}
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func (self *Mem) Get() error {
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var buffers, cached uint64
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table := map[string]*uint64{
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"MemTotal": &self.Total,
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"MemFree": &self.Free,
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"Buffers": &buffers,
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"Cached": &cached,
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}
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if err := parseMeminfo(table); err != nil {
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return err
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}
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self.Used = self.Total - self.Free
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kern := buffers + cached
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self.ActualFree = self.Free + kern
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self.ActualUsed = self.Used - kern
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return nil
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}
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func (self *Swap) Get() error {
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table := map[string]*uint64{
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"SwapTotal": &self.Total,
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"SwapFree": &self.Free,
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}
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if err := parseMeminfo(table); err != nil {
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return err
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}
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self.Used = self.Total - self.Free
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return nil
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}
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func (self *Cpu) Get() error {
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return readFile(Procd+"/stat", func(line string) bool {
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if len(line) > 4 && line[0:4] == "cpu " {
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parseCpuStat(self, line)
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return false
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}
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return true
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})
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}
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func (self *CpuList) Get() error {
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capacity := len(self.List)
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if capacity == 0 {
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capacity = 4
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}
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list := make([]Cpu, 0, capacity)
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err := readFile(Procd+"/stat", func(line string) bool {
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if len(line) > 3 && line[0:3] == "cpu" && line[3] != ' ' {
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cpu := Cpu{}
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parseCpuStat(&cpu, line)
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list = append(list, cpu)
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}
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return true
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})
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self.List = list
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return err
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}
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func (self *FileSystemList) Get() error {
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capacity := len(self.List)
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if capacity == 0 {
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capacity = 10
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}
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fslist := make([]FileSystem, 0, capacity)
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err := readFile("/etc/mtab", func(line string) bool {
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fields := strings.Fields(line)
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fs := FileSystem{}
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fs.DevName = fields[0]
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fs.DirName = fields[1]
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fs.SysTypeName = fields[2]
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fs.Options = fields[3]
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fslist = append(fslist, fs)
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return true
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})
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self.List = fslist
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return err
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}
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func (self *ProcList) Get() error {
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dir, err := os.Open(Procd)
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if err != nil {
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return err
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}
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defer dir.Close()
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const readAllDirnames = -1 // see os.File.Readdirnames doc
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names, err := dir.Readdirnames(readAllDirnames)
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if err != nil {
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return err
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}
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capacity := len(names)
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list := make([]int, 0, capacity)
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for _, name := range names {
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if name[0] < '0' || name[0] > '9' {
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continue
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}
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pid, err := strconv.Atoi(name)
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if err == nil {
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list = append(list, pid)
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}
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}
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self.List = list
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return nil
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}
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func (self *ProcState) Get(pid int) error {
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contents, err := readProcFile(pid, "stat")
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if err != nil {
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return err
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}
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fields := strings.Fields(string(contents))
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self.Name = fields[1][1 : len(fields[1])-1] // strip ()'s
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self.State = RunState(fields[2][0])
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self.Ppid, _ = strconv.Atoi(fields[3])
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self.Tty, _ = strconv.Atoi(fields[6])
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self.Priority, _ = strconv.Atoi(fields[17])
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self.Nice, _ = strconv.Atoi(fields[18])
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self.Processor, _ = strconv.Atoi(fields[38])
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return nil
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}
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func (self *ProcMem) Get(pid int) error {
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contents, err := readProcFile(pid, "statm")
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if err != nil {
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return err
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}
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fields := strings.Fields(string(contents))
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size, _ := strtoull(fields[0])
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self.Size = size << 12
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rss, _ := strtoull(fields[1])
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self.Resident = rss << 12
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share, _ := strtoull(fields[2])
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self.Share = share << 12
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contents, err = readProcFile(pid, "stat")
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if err != nil {
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return err
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}
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fields = strings.Fields(string(contents))
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self.MinorFaults, _ = strtoull(fields[10])
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self.MajorFaults, _ = strtoull(fields[12])
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self.PageFaults = self.MinorFaults + self.MajorFaults
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return nil
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}
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func (self *ProcTime) Get(pid int) error {
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contents, err := readProcFile(pid, "stat")
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if err != nil {
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return err
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}
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fields := strings.Fields(string(contents))
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user, _ := strtoull(fields[13])
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sys, _ := strtoull(fields[14])
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// convert to millis
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self.User = user * (1000 / system.ticks)
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self.Sys = sys * (1000 / system.ticks)
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self.Total = self.User + self.Sys
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// convert to millis
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self.StartTime, _ = strtoull(fields[21])
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self.StartTime /= system.ticks
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self.StartTime += system.btime
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self.StartTime *= 1000
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return nil
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}
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func (self *ProcArgs) Get(pid int) error {
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contents, err := readProcFile(pid, "cmdline")
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if err != nil {
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return err
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}
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bbuf := bytes.NewBuffer(contents)
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var args []string
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for {
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arg, err := bbuf.ReadBytes(0)
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if err == io.EOF {
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break
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}
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args = append(args, string(chop(arg)))
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}
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self.List = args
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return nil
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}
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func (self *ProcExe) Get(pid int) error {
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fields := map[string]*string{
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"exe": &self.Name,
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"cwd": &self.Cwd,
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"root": &self.Root,
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}
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for name, field := range fields {
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val, err := os.Readlink(procFileName(pid, name))
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if err != nil {
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return err
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}
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*field = val
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}
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return nil
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}
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func parseMeminfo(table map[string]*uint64) error {
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return readFile(Procd+"/meminfo", func(line string) bool {
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fields := strings.Split(line, ":")
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if ptr := table[fields[0]]; ptr != nil {
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num := strings.TrimLeft(fields[1], " ")
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val, err := strtoull(strings.Fields(num)[0])
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if err == nil {
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*ptr = val * 1024
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}
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}
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return true
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})
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}
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func parseCpuStat(self *Cpu, line string) error {
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fields := strings.Fields(line)
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self.User, _ = strtoull(fields[1])
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self.Nice, _ = strtoull(fields[2])
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self.Sys, _ = strtoull(fields[3])
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self.Idle, _ = strtoull(fields[4])
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self.Wait, _ = strtoull(fields[5])
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self.Irq, _ = strtoull(fields[6])
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self.SoftIrq, _ = strtoull(fields[7])
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self.Stolen, _ = strtoull(fields[8])
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return nil
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}
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func readFile(file string, handler func(string) bool) error {
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contents, err := ioutil.ReadFile(file)
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if err != nil {
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return err
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}
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reader := bufio.NewReader(bytes.NewBuffer(contents))
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for {
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line, _, err := reader.ReadLine()
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if err == io.EOF {
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break
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}
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if !handler(string(line)) {
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break
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}
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}
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return nil
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}
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func strtoull(val string) (uint64, error) {
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return strconv.ParseUint(val, 10, 64)
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}
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func procFileName(pid int, name string) string {
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return Procd + "/" + strconv.Itoa(pid) + "/" + name
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}
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func readProcFile(pid int, name string) ([]byte, error) {
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path := procFileName(pid, name)
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contents, err := ioutil.ReadFile(path)
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if err != nil {
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if perr, ok := err.(*os.PathError); ok {
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if perr.Err == syscall.ENOENT {
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return nil, syscall.ESRCH
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}
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}
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}
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return contents, err
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}
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