diff --git a/pidusage.go b/pidusage.go
new file mode 100644
index 0000000..4e4b378
--- /dev/null
+++ b/pidusage.go
@@ -0,0 +1,152 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"math"
+	"os/exec"
+	"path"
+	"runtime"
+	"strconv"
+	"strings"
+)
+
+// SysInfo will record cpu and memory data
+type SysInfo struct {
+	CPU    float64
+	Memory float64
+}
+
+// Stat will store CUP time struct
+type Stat struct {
+	utime  float64
+	stime  float64
+	cutime float64
+	cstime float64
+	start  float64
+	rss    float64
+	uptime float64
+}
+
+// type fn func(int) *SysInfo
+
+// var fnMap map[string]fn
+var platform string
+var history map[int]Stat
+
+// func wrapper(statType string) func(pid int) *SysInfo {
+// 	return func(pid int) *SysInfo {
+// 		return stat(pid, statType)
+// 	}
+// }
+func init() {
+	platform = runtime.GOOS
+	if strings.Contains(platform, "win") {
+		platform = "win"
+	}
+	history = make(map[int]Stat)
+	// fnMap = make(map[string]fn)
+	// fnMap["darwin"] = wrapper("ps")
+	// fnMap["sunos"] = wrapper("ps")
+	// fnMap["freebsd"] = wrapper("ps")
+	// fnMap["aix"] = wrapper("ps")
+	// fnMap["linux"] = wrapper("proc")
+	// fnMap["netbsd"] = wrapper("proc")
+	// fnMap["win"] = wrapper("win")
+}
+func formatStdOut(stdout []byte, userfulIndex int) []string {
+	infoArr := strings.Split(string(stdout), "\n")[userfulIndex]
+	ret := strings.Fields(infoArr)
+	return ret
+}
+
+func parseFloat(val string) float64 {
+	floatVal, _ := strconv.ParseFloat(val, 64)
+	return floatVal
+}
+
+func stat(pid int, statType string) *SysInfo {
+	sysInfo := &SysInfo{}
+	_history := history[pid]
+	if statType == "ps" {
+		args := "-o pcpu,rss -p"
+		if platform == "aix" {
+			args = "-o pcpu,rssize -p"
+		}
+		stdout, _ := exec.Command("ps", args, strconv.Itoa(pid)).Output()
+		ret := formatStdOut(stdout, 1)
+		sysInfo.CPU = parseFloat(ret[0])
+		sysInfo.Memory = parseFloat(ret[1])
+	} else if statType == "proc" {
+		// default clkTck and pageSize
+		var clkTck float64 = 100
+		var pageSize float64 = 4096
+
+		uptimeFileBytes, err := ioutil.ReadFile(path.Join("/proc", "uptime"))
+		uptime := parseFloat(strings.Split(string(uptimeFileBytes), " ")[0])
+		fmt.Println("uptime", uptime)
+
+		clkTckStdout, err := exec.Command("getconf", "CLK_TCK").Output()
+		if err == nil {
+			clkTck = parseFloat(formatStdOut(clkTckStdout, 0)[0])
+		}
+
+		pageSizeStdout, err := exec.Command("getconf", "PAGESIZE").Output()
+		if err == nil {
+			pageSize = parseFloat(formatStdOut(pageSizeStdout, 0)[0])
+		}
+
+		fmt.Println(clkTck, pageSize)
+		fmt.Println(path.Join("/proc", strconv.Itoa(pid), "stat"))
+		procStatFileBytes, err := ioutil.ReadFile(path.Join("/proc", strconv.Itoa(pid), "stat"))
+		infos := strings.Split(strings.SplitAfter(string(procStatFileBytes), ")")[1], " ")
+		stat := &Stat{
+			utime:  parseFloat(infos[12]),
+			stime:  parseFloat(infos[13]),
+			cutime: parseFloat(infos[14]),
+			cstime: parseFloat(infos[15]),
+			start:  parseFloat(infos[20]) / clkTck,
+			rss:    parseFloat(infos[22]),
+			uptime: uptime,
+		}
+
+		_stime := 0.0
+		_utime := 0.0
+		if _history.stime != 0.0 {
+			_stime = _history.stime
+		}
+
+		if _history.utime != 0.0 {
+			_utime = _history.utime
+		}
+		total := stat.stime - _stime + stat.utime - _utime
+		total = total / clkTck
+
+		seconds := stat.start - uptime
+		if _history.uptime != 0.0 {
+			seconds = uptime - _history.uptime
+		}
+
+		seconds = math.Abs(seconds)
+		if seconds == 0 {
+			seconds = 1
+		}
+
+		history[pid] = *stat
+		fmt.Println(total)
+		sysInfo.CPU = (total / seconds) * 100
+		sysInfo.Memory = stat.rss * pageSize
+	}
+	return sysInfo
+
+}
+
+// Stat will return current system CPU and memory data
+// func Stat(pid int) *SysInfo {
+// 	sysInfo := fnMap[platform](pid)
+// 	return sysInfo
+// }
+
+func main() {
+	stat(662, "proc")
+}