xmtop/vendor/github.com/shirou/gopsutil/mem/mem_darwin_nocgo.go
2018-02-20 19:25:54 -08:00

95 lines
1.9 KiB
Go

// +build darwin
// +build !cgo
package mem
import (
"context"
"os/exec"
"strconv"
"strings"
"golang.org/x/sys/unix"
)
// Runs vm_stat and returns Free and inactive pages
func getVMStat(vms *VirtualMemoryStat) error {
vm_stat, err := exec.LookPath("vm_stat")
if err != nil {
return err
}
out, err := invoke.Command(vm_stat)
if err != nil {
return err
}
return parseVMStat(string(out), vms)
}
func parseVMStat(out string, vms *VirtualMemoryStat) error {
var err error
lines := strings.Split(out, "\n")
pagesize := uint64(unix.Getpagesize())
for _, line := range lines {
fields := strings.Split(line, ":")
if len(fields) < 2 {
continue
}
key := strings.TrimSpace(fields[0])
value := strings.Trim(fields[1], " .")
switch key {
case "Pages free":
free, e := strconv.ParseUint(value, 10, 64)
if e != nil {
err = e
}
vms.Free = free * pagesize
case "Pages inactive":
inactive, e := strconv.ParseUint(value, 10, 64)
if e != nil {
err = e
}
vms.Inactive = inactive * pagesize
case "Pages active":
active, e := strconv.ParseUint(value, 10, 64)
if e != nil {
err = e
}
vms.Active = active * pagesize
case "Pages wired down":
wired, e := strconv.ParseUint(value, 10, 64)
if e != nil {
err = e
}
vms.Wired = wired * pagesize
}
}
return err
}
// VirtualMemory returns VirtualmemoryStat.
func VirtualMemory() (*VirtualMemoryStat, error) {
return VirtualMemoryWithContext(context.Background())
}
func VirtualMemoryWithContext(ctx context.Context) (*VirtualMemoryStat, error) {
ret := &VirtualMemoryStat{}
total, err := getHwMemsize()
if err != nil {
return nil, err
}
err = getVMStat(ret)
if err != nil {
return nil, err
}
ret.Available = ret.Free + ret.Inactive
ret.Total = total
ret.Used = ret.Total - ret.Available
ret.UsedPercent = 100 * float64(ret.Used) / float64(ret.Total)
return ret, nil
}