How to concatenate strings?

[mlen]

Is it possible to do this? It'd be nice to have this, so that I can implement execsnoop with return code check. Currently, I can only do stuff like this:

kprobe:sys_execve {
  x = 0;

  printf("%s: ", mem(arg(0), "128s"));

  unroll (10) {
    if (mem(arg(1) + x*sizeof("p"), "p")) {
      printf("%s ", mem(mem(arg(1) + x*sizeof("p"), "p"), "128s"));
      x=x+1;
    }
  }

  printf("\n");
}

[mlen]

Noticed how you use multikey map for this in examples, nice!