sys.go

package main

import (
	"fmt"
	"syscall"
)

const (
	B  = 1
	KB = 1024 * B
	MB = 1024 * KB
)

type DiskStatus struct {
	All  uint64 `json:"all"`
	Used uint64 `json:"used"`
	Free uint64 `json:"free"`
}

func DiskUsage(path string) (disk DiskStatus) {
	var (
		fs  = syscall.Statfs_t{}
		err = syscall.Statfs(path, &fs)
	)

	if err != nil {
		return
	}

	disk.All = fs.Blocks * uint64(fs.Bsize)
	disk.Free = fs.Bfree * uint64(fs.Bsize)
	disk.Used = disk.All - disk.Free

	return
}

type MemoryStatus struct {
	All  uint64 `json:"all"`
	Used uint64 `json:"used"`
	Free uint64 `json:"free"`
}

func MemoryUsage() (memory MemoryStatus) {
	var (
		si  = syscall.Sysinfo_t{}
		err = syscall.Sysinfo(&si)
	)

	if err != nil {
		return
	}

	memory.All = si.Totalram
	memory.Free = si.Freeram
	memory.Used = memory.All - memory.Free

	return
}

func main() {
	var (
		path   = "/"
		disk   = DiskUsage(path)
		memory = MemoryUsage()
	)

	fmt.Println(path)
	fmt.Printf("All: %.2f MB\n", float64(disk.All)/float64(MB))
	fmt.Printf("Used: %.2f MB\n", float64(disk.Used)/float64(MB))
	fmt.Printf("Free: %.2f MB\n", float64(disk.Free)/float64(MB))

	fmt.Printf("All: %.2f MB\n", float64(memory.All)/float64(MB))
	fmt.Printf("Used: %.2f MB\n", float64(memory.Used)/float64(MB))
	fmt.Printf("Free: %.2f MB\n", float64(memory.Free)/float64(MB))
}