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systeminfo_linux.go
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systeminfo_linux.go
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package systeminfo
import (
"bufio"
"bytes"
"io"
"io/ioutil"
"strconv"
"strings"
)
type procMem struct {
Total uint64
Used uint64
Free uint64
ActualFree uint64
ActualUsed uint64
}
func memoryStats() (*memory, error) {
m := new(memory)
mem := procMem{}
err := mem.Get()
if err != nil {
return nil, err
}
m.Usage = mem.ActualUsed
m.Total = mem.Total
return m, nil
}
func (self *procMem) Get() error {
var buffers, cached uint64
table := map[string]*uint64{
"MemTotal": &self.Total,
"MemFree": &self.Free,
"Buffers": &buffers,
"Cached": &cached,
}
if err := parseMeminfo(table); err != nil {
return err
}
self.Used = self.Total - self.Free
kern := buffers + cached
self.ActualFree = self.Free + kern
self.ActualUsed = self.Used - kern
return nil
}
func parseMeminfo(table map[string]*uint64) error {
return readFile("/proc/meminfo", func(line string) bool {
fields := strings.Split(line, ":")
if ptr := table[fields[0]]; ptr != nil {
num := strings.TrimLeft(fields[1], " ")
val, err := strtoull(strings.Fields(num)[0])
if err == nil {
*ptr = val * 1024
}
}
return true
})
}
func readFile(file string, handler func(string) bool) error {
contents, err := ioutil.ReadFile(file)
if err != nil {
return err
}
reader := bufio.NewReader(bytes.NewBuffer(contents))
for {
line, _, err := reader.ReadLine()
if err == io.EOF {
break
}
if !handler(string(line)) {
break
}
}
return nil
}
func strtoull(val string) (uint64, error) {
return strconv.ParseUint(val, 10, 64)
}