Add a pointer arg for waiter->init to generalize the handling

for waiters which pass over a pipe.

bin/varnishd/waiter/cache_waiter.c

@@ -44,6 +44,7 @@ struct waiter {
 #define WAITER_MAGIC			0x17c399db
 	const struct waiter_impl	*impl;
 	void				*priv;
+	int				pfd;
 };
 
 const char *
@@ -63,13 +64,14 @@ WAIT_Init(waiter_handle_f *func)
 
 	ALLOC_OBJ(w, WAITER_MAGIC);
 	AN(w);
+	w->pfd = -1;
 
 	AN(waiter);
 	AN(waiter->name);
 	AN(waiter->init);
-	AN(waiter->pass);
 	w->impl = waiter;
-	w->priv = w->impl->init(func);
+	w->priv = w->impl->init(func, &w->pfd);
+	AN(waiter->pass || w->pfd >= 0);
 	return (w);
 }
 

bin/varnishd/waiter/cache_waiter_epoll.c

@@ -233,12 +233,13 @@ vwe_pass(void *priv, struct sess *sp)
 
 /*--------------------------------------------------------------------*/
 
-static void *
-vwe_init(waiter_handle_f *func)
+static void * __match_proto__(waiter_init_f)
+vwe_init(waiter_handle_f *func, int *pfd)
 {
 	struct vwe *vwe;
 
 	AN(func);
+	AN(pfd);
 	ALLOC_OBJ(vwe, VWE_MAGIC);
 	AN(vwe);
 	VTAILQ_INIT(&vwe->sesshead);

bin/varnishd/waiter/cache_waiter_kqueue.c

@@ -228,12 +228,13 @@ vwk_pass(void *priv, struct sess *sp)
 
 /*--------------------------------------------------------------------*/
 
-static void *
-vwk_init(waiter_handle_f *func)
+static void * __match_proto__(waiter_init_f)
+vwk_init(waiter_handle_f *func, int *pfd)
 {
 	struct vwk *vwk;
 
 	AN(func);
+	AN(pfd);
 	ALLOC_OBJ(vwk, VWK_MAGIC);
 	AN(vwk);
 

bin/varnishd/waiter/cache_waiter_poll.c

@@ -205,12 +205,13 @@ vwp_poll_pass(void *priv, struct sess *sp)
 
 /*--------------------------------------------------------------------*/
 
-static void *
-vwp_poll_init(waiter_handle_f *func)
+static void * __match_proto__(waiter_init_f)
+vwp_poll_init(waiter_handle_f *func, int *pfd)
 {
 	struct vwp *vwp;
 
 	AN(func);
+	AN(pfd);
 	ALLOC_OBJ(vwp, VWP_MAGIC);
 	AN(vwp);
 	VTAILQ_INIT(&vwp->sesshead);

bin/varnishd/waiter/cache_waiter_ports.c

@@ -256,12 +256,13 @@ vws_pass(void *priv, struct sess *sp)
 
 /*--------------------------------------------------------------------*/
 
-static void *
-vws_init(waiter_handle_f *func)
+static void * __match_proto__(waiter_init_f)
+vws_init(waiter_handle_f *func, int *pfd)
 {
 	struct vws *vws;
 
 	AN(func);
+	AN(pfd);
 	ALLOC_OBJ(vws, VWS_MAGIC);
 	AN(vws);
 	vws->func = func;

bin/varnishd/waiter/waiter.h

@@ -38,7 +38,7 @@ enum wait_event {
 };
 
 typedef void waiter_handle_f(void *ptr, int fd, enum wait_event, double now);
-typedef void* waiter_init_f(waiter_handle_f *);
+typedef void* waiter_init_f(waiter_handle_f *, int *);
 typedef int waiter_pass_f(void *priv, struct sess *);
 
 #define WAITER_DEFAULT		"platform dependent"