gdb on sigint

a.cc

#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>

void sigint(int)
{
  pid_t pid = fork();
  if (pid == -1)
    abort();
  else if (pid) {
    char s[13];
    sprintf(s, "%d", pid);
    execlp("gdb", "gdb", "-p", s, NULL);
  } else {
    setpgid(0, getpid());
    kill(getpid(), SIGSTOP);
  }
}

int main()
{
  signal(SIGINT, sigint);
  sleep(1337);
  puts("seen after gdb");
  sleep(1337);
}