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