package main

import (
    "fmt"
    "io/ioutil"
    "os"
    "strconv"
    "syscall"
)

func ShowProcessInfo(pid int) {
    err := syscall.PtraceAttach(pid)
    if err != nil {
        panic(err)
    }

    _, err = syscall.Wait4(pid, nil, 0, nil)
    if err != nil {
        panic(err)
    }

    var regs syscall.PtraceRegs
    err = syscall.PtraceGetRegs(pid, &regs)
    if err != nil {
        panic(err)
    }

    err = syscall.PtraceDetach(pid)
    if err != nil {
        panic(err)
    }
    fmt.Println("pid:", pid)
    fmt.Println(regs.Rsp)
}

func ShowProcessStack(pid string) {
    dirs, err := ioutil.ReadDir(fmt.Sprintf("/proc/%s/task", pid))
    if err != nil {
        panic(err)
    }
    for _, dir := range dirs {
        sub_pid, _ := strconv.ParseInt(dir.Name(), 10, 32)
        ShowProcessInfo(int(sub_pid))
    }
}
func main() {
    ShowProcessStack(os.Args[1])
}