#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<sys/types.h>
#include<sys/ptrace.h>
#include<sys/user.h>
#include<sys/wait.h>

#define DONT_CARE 0

int stats;
struct user_regs_struct regs;

void continue_execution(pid_t pid)
{
  ptrace(PTRACE_CONT, pid, DONT_CARE, DONT_CARE);
  int wait_status;
  int options = 0;
  waitpid(pid, &wait_status, options);
  return;
}

void print_rax(pid_t pid)
{
  ptrace(PTRACE_GETREGS, pid, DONT_CARE, &regs);
  printf("rax = %llu\n", regs.rax);
  return;
}

void step(pid_t pid)
{
  ptrace(PTRACE_SINGLESTEP, pid, DONT_CARE, DONT_CARE);
  return;
}

int main()
{
  printf("procces is run ");
  pid_t pid;
  pid = fork();
  if (pid==0)
  {
    printf(" -- child\n");
    ptrace(PTRACE_TRACEME, 0, 0, 0);
    execl("./testee", "testee", NULL);
    printf("____AFTER_TRACE_CHILD____\n");
  }
  else if(pid > 0)
  {
    char buff;
    printf(" -- parrent\n");
    continue_execution(pid);
    do {
      waitpid(pid, &stats, 0);
      printf("stats - %d", stats);
      print_rax(pid);
      ptrace(PTRACE_SINGLESTEP, pid, DONT_CARE, DONT_CARE);
      printf("enter any: ");
      read(0, &buff, 1);
      printf("\n");
    } while(stats);
    printf("____AFTER_TRACE_PARRENT____\n");
  }
  return 0;
}