72   to set a signal handler, and a socket pair to tell the event base when
74   Note that I said "the event base" : only one event base can be set up to use
110 /* The event base that's currently getting informed about signals. */
122 evsig_set_base_(struct event_base *base)  in evsig_set_base_()  argument
125 	evsig_base = base;  in evsig_set_base_()
126 	evsig_base_n_signals_added = base->sig.ev_n_signals_added;  in evsig_set_base_()
127 	evsig_base_fd = base->sig.ev_signal_pair[1];  in evsig_set_base_()
139 	struct event_base *base;  in evsig_cb()  local
141 	base = arg;  in evsig_cb()
167 	EVBASE_ACQUIRE_LOCK(base, th_base_lock);  in evsig_cb()
170 			evmap_signal_active_(base, i, ncaught[i]);  in evsig_cb()
172 	EVBASE_RELEASE_LOCK(base, th_base_lock);  in evsig_cb()
176 evsig_init_(struct event_base *base)  in evsig_init_()  argument
183 	if (evutil_make_internal_pipe_(base->sig.ev_signal_pair) == -1) {  in evsig_init_()
194 	if (base->sig.sh_old) {  in evsig_init_()
195 		mm_free(base->sig.sh_old);  in evsig_init_()
197 	base->sig.sh_old = NULL;  in evsig_init_()
198 	base->sig.sh_old_max = 0;  in evsig_init_()
200 	event_assign(&base->sig.ev_signal, base, base->sig.ev_signal_pair[0],  in evsig_init_()
201 		EV_READ | EV_PERSIST, evsig_cb, base);  in evsig_init_()
203 	base->sig.ev_signal.ev_flags |= EVLIST_INTERNAL;  in evsig_init_()
204 	event_priority_set(&base->sig.ev_signal, 0);  in evsig_init_()
206 	base->evsigsel = &evsigops;  in evsig_init_()
211 /* Helper: set the signal handler for evsignal to handler in base, so that
214 evsig_set_handler_(struct event_base *base,  in evsig_set_handler_()  argument
222 	struct evsig_info *sig = &base->sig;  in evsig_set_handler_()
280 evsig_add(struct event_base *base, evutil_socket_t evsignal, short old, short events, void *p)  in evsig_add()  argument
282 	struct evsig_info *sig = &base->sig;  in evsig_add()
289 	if (evsig_base != base && evsig_base_n_signals_added) {  in evsig_add()
290 		event_warnx("Added a signal to event base %p with signals "  in evsig_add()
292 		    "signals at a time with the %s backend.  The base with "  in evsig_add()
296 		    base, evsig_base, base->evsel->name);  in evsig_add()
298 	evsig_base = base;  in evsig_add()
300 	evsig_base_fd = base->sig.ev_signal_pair[1];  in evsig_add()
304 	if (evsig_set_handler_(base, (int)evsignal, evsig_handler) == -1) {  in evsig_add()
326 evsig_restore_handler_(struct event_base *base, int evsignal)  in evsig_restore_handler_()  argument
329 	struct evsig_info *sig = &base->sig;  in evsig_restore_handler_()
363 evsig_del(struct event_base *base, evutil_socket_t evsignal, short old, short events, void *p)  in evsig_del()  argument
372 	--base->sig.ev_n_signals_added;  in evsig_del()
375 	return (evsig_restore_handler_(base, (int)evsignal));  in evsig_del()
389 			"%s: received signal %d, but have no base configured",  in evsig_handler()
415 evsig_dealloc_(struct event_base *base)  in evsig_dealloc_()  argument
418 	if (base->sig.ev_signal_added) {  in evsig_dealloc_()
419 		event_del(&base->sig.ev_signal);  in evsig_dealloc_()
420 		base->sig.ev_signal_added = 0;  in evsig_dealloc_()
424 	event_debug_unassign(&base->sig.ev_signal);  in evsig_dealloc_()
427 		if (i < base->sig.sh_old_max && base->sig.sh_old[i] != NULL)  in evsig_dealloc_()
428 			evsig_restore_handler_(base, i);  in evsig_dealloc_()
431 	if (base == evsig_base) {  in evsig_dealloc_()
438 	if (base->sig.ev_signal_pair[0] != -1) {  in evsig_dealloc_()
439 		evutil_closesocket(base->sig.ev_signal_pair[0]);  in evsig_dealloc_()
440 		base->sig.ev_signal_pair[0] = -1;  in evsig_dealloc_()
442 	if (base->sig.ev_signal_pair[1] != -1) {  in evsig_dealloc_()
443 		evutil_closesocket(base->sig.ev_signal_pair[1]);  in evsig_dealloc_()
444 		base->sig.ev_signal_pair[1] = -1;  in evsig_dealloc_()
446 	base->sig.sh_old_max = 0;  in evsig_dealloc_()
449 	if (base->sig.sh_old) {  in evsig_dealloc_()
450 		mm_free(base->sig.sh_old);  in evsig_dealloc_()
451 		base->sig.sh_old = NULL;  in evsig_dealloc_()