procs_spawned.d

#!/usr/sbin/dtrace -s

#pragma D option quiet

proc:::exec 
/ $1 == curpsinfo->pr_ppid /
{
  self->start = timestamp;
}

proc:::exec-success 
/self->start/
{
  this->now = timestamp;
  this->elapsed = this->now - self->start;
  printf("Process exited: PID = %d, Parent PID = %d, Start time: %d, End time: %d, Total time: %d, Command = %s\n",
  curpsinfo->pr_pid, curpsinfo->pr_ppid, self->start, this->now, this->elapsed, curpsinfo->pr_psargs);
}