eventswitch
eventswitch(TRAP_EXEC, 0, 0);
eventswitch(TRAP_CHLD, PTRACE_POSIX_SPAWN, pid);
eventswitch(TRAP_CHLD,
eventswitch(TRAP_CHLD, PTRACE_VFORK_DONE, retval[0]);
eventswitch(TRAP_LWP, PTRACE_LWP_EXIT, l->l_lid);
eventswitch(code, pe_report_event, p->p_oppid);
eventswitch(TRAP_LWP, PTRACE_LWP_CREATE, l->l_lid);
void eventswitch(int, int, int);