Exemplo n.º 1
0
static int
evsig_add(struct event_base *base, evutil_socket_t evsignal, short old, short events, void *p)
{
	struct evsig_info *sig = &base->sig;
	(void)p;

	EVUTIL_ASSERT(evsignal >= 0 && evsignal < NSIG);

	/* catch signals if they happen quickly */
	EVSIGBASE_LOCK();
	if (evsig_base != base && evsig_base_n_signals_added) {
		event_warnx("Added a signal to event base %p with signals "
		    "already added to event_base %p.  Only one can have "
		    "signals at a time with the %s backend.  The base with "
		    "the most recently added signal or the most recent "
		    "event_base_loop() call gets preference; do "
		    "not rely on this behavior in future Libevent versions.",
		    base, evsig_base, base->evsel->name);
	}
	evsig_base = base;
	evsig_base_n_signals_added = ++sig->ev_n_signals_added;
	evsig_base_fd = base->sig.ev_signal_pair[1];
	EVSIGBASE_UNLOCK();

	event_debug(("%s: %d: changing signal handler", __func__, (int)evsignal));
	if (evsig_set_handler_(base, (int)evsignal, evsig_handler) == -1) {
		goto err;
	}


	if (!sig->ev_signal_added) {
		if (event_add(&sig->ev_signal, NULL))
			goto err;
		sig->ev_signal_added = 1;
	}

	return (0);

err:
	EVSIGBASE_LOCK();
	--evsig_base_n_signals_added;
	--sig->ev_n_signals_added;
	EVSIGBASE_UNLOCK();
	return (-1);
}
Exemplo n.º 2
0
void
evsig_set_base_(struct event_base *base)
{
	EVSIGBASE_LOCK();
	evsig_base = base;
	evsig_base_n_signals_added = base->sig.ev_n_signals_added;
	evsig_base_fd = base->sig.ev_signal_pair[1];
	EVSIGBASE_UNLOCK();
}
Exemplo n.º 3
0
void
evsig_set_base(struct event_base *base)
{
	EVSIGBASE_LOCK();
	evsig_base = base;
	evsig_base_n_signals_added = base->sig.ev_n_signals_added;
	evsig_base_fd = base->sig.ev_signal_pair[0];//0用来信号处理函数发送给base,1已用base接收信号
	EVSIGBASE_UNLOCK();
}
Exemplo n.º 4
0
static int
evsig_del(struct event_base *base, evutil_socket_t evsignal, short old, short events, void *p)
{
	EVUTIL_ASSERT(evsignal >= 0 && evsignal < NSIG);

	event_debug(("%s: %d: restoring signal handler", __func__, evsignal));

	EVSIGBASE_LOCK();
	--evsig_base_n_signals_added;
	--base->sig.ev_n_signals_added;
	EVSIGBASE_UNLOCK();

	return (evsig_restore_handler_(base, (int)evsignal));
}
Exemplo n.º 5
0
void
evsig_dealloc(struct event_base *base)
{
	int i = 0;
	if (base->sig.ev_signal_added) {
		event_del(&base->sig.ev_signal);//删除信号事件
		base->sig.ev_signal_added = 0;
	}
	/* debug event is created in evsig_init/event_assign even when
	 * ev_signal_added == 0, so unassign is required */
	event_debug_unassign(&base->sig.ev_signal);

	//恢复所有的信号处理函数
	for (i = 0; i < NSIG; ++i) {
		if (i < base->sig.sh_old_max && base->sig.sh_old[i] != NULL)
			_evsig_restore_handler(base, i);
	}
	EVSIGBASE_LOCK();
	if (base == evsig_base) {
		evsig_base = NULL;
		evsig_base_n_signals_added = 0;
		evsig_base_fd = -1;
	}
	EVSIGBASE_UNLOCK();

	//关闭socketpair描述府
	if (base->sig.ev_signal_pair[0] != -1) {
		evutil_closesocket(base->sig.ev_signal_pair[0]);
		base->sig.ev_signal_pair[0] = -1;
	}
	if (base->sig.ev_signal_pair[1] != -1) {
		evutil_closesocket(base->sig.ev_signal_pair[1]);
		base->sig.ev_signal_pair[1] = -1;
	}
	base->sig.sh_old_max = 0;

	/* per index frees are handled in evsig_del() */
	if (base->sig.sh_old) {
		mm_free(base->sig.sh_old);
		base->sig.sh_old = NULL;
	}
}
Exemplo n.º 6
0
void
evsig_dealloc(struct event_base *base)
{
    int i = 0;
    if (base->sig.ev_signal_added) {
        event_del(&base->sig.ev_signal);
        event_debug_unassign(&base->sig.ev_signal);
        base->sig.ev_signal_added = 0;
    }

    for (i = 0; i < NSIG; ++i) {
        if (i < base->sig.sh_old_max && base->sig.sh_old[i] != NULL)
            _evsig_restore_handler(base, i);
    }
    EVSIGBASE_LOCK();
    if (base == evsig_base) {
        evsig_base = NULL;
        evsig_base_n_signals_added = 0;
        evsig_base_fd = -1;
    }
    EVSIGBASE_UNLOCK();

    if (base->sig.ev_signal_pair[0] != -1) {
        evutil_closesocket(base->sig.ev_signal_pair[0]);
        base->sig.ev_signal_pair[0] = -1;
    }
    if (base->sig.ev_signal_pair[1] != -1) {
        evutil_closesocket(base->sig.ev_signal_pair[1]);
        base->sig.ev_signal_pair[1] = -1;
    }
    base->sig.sh_old_max = 0;

    /* per index frees are handled in evsig_del() */
    if (base->sig.sh_old) {
        mm_free(base->sig.sh_old);
        base->sig.sh_old = NULL;
    }
}