Introduced nxt_socket_defer_accept().

src/nxt_listen_socket.c

@@ -78,16 +78,10 @@ nxt_listen_socket_create(nxt_task_t *task, nxt_listen_socket_t *ls,
 
 #endif
 
-#ifdef TCP_DEFER_ACCEPT
-
     if (ls->read_after_accept) {
-        /* Defer accept() maximum at 1 second. */
-        /* Ignore possible error. TODO: why? */
-        (void) nxt_socket_setsockopt(task, s, IPPROTO_TCP, TCP_DEFER_ACCEPT, 1);
+        nxt_socket_defer_accept(task, s, sa);
     }
 
-#endif
-
     switch (nxt_socket_bind(task, s, sa, bind_test)) {
 
     case NXT_OK:

src/nxt_router.c

@@ -1053,12 +1053,7 @@ nxt_router_listen_socket_ready(nxt_task_t *task, nxt_port_recv_msg_t *msg,
         goto fail;
     }
 
-#ifdef TCP_DEFER_ACCEPT
-
-    /* Defer Linux accept() up to for 1 second. */
-    (void) nxt_socket_setsockopt(task, s, IPPROTO_TCP, TCP_DEFER_ACCEPT, 1);
-
-#endif
+    nxt_socket_defer_accept(task, s, rpc->socket_conf->sockaddr);
 
     ret = nxt_listen_socket(task, s, NXT_LISTEN_BACKLOG);
     if (nxt_slow_path(ret != NXT_OK)) {

src/nxt_socket.c

@@ -63,6 +63,27 @@ nxt_socket_close(nxt_task_t *task, nxt_socket_t s)
 }
 
 
+void
+nxt_socket_defer_accept(nxt_task_t *task, nxt_socket_t s, nxt_sockaddr_t *sa)
+{
+#if (NXT_HAVE_UNIX_DOMAIN)
+
+    if (sa->u.sockaddr.sa_family == AF_UNIX) {
+        /* Deferred accept() is not supported on AF_UNIX sockets. */
+        return;
+    }
+
+#endif
+
+#ifdef TCP_DEFER_ACCEPT
+
+    /* Defer Linux accept() up to for 1 second. */
+    (void) nxt_socket_setsockopt(task, s, IPPROTO_TCP, TCP_DEFER_ACCEPT, 1);
+
+#endif
+}
+
+
 nxt_int_t
 nxt_socket_getsockopt(nxt_task_t *task, nxt_socket_t s, nxt_uint_t level,
     nxt_uint_t sockopt)

src/nxt_socket.h

@@ -94,6 +94,8 @@ typedef union {
 NXT_EXPORT nxt_socket_t nxt_socket_create(nxt_task_t *task, nxt_uint_t family,
     nxt_uint_t type, nxt_uint_t protocol, nxt_uint_t flags);
 NXT_EXPORT void nxt_socket_close(nxt_task_t *task, nxt_socket_t s);
+NXT_EXPORT void nxt_socket_defer_accept(nxt_task_t *task, nxt_socket_t s,
+    nxt_sockaddr_t *sa);
 NXT_EXPORT nxt_int_t nxt_socket_getsockopt(nxt_task_t *task, nxt_socket_t s,
     nxt_uint_t level, nxt_uint_t sockopt);
 NXT_EXPORT nxt_int_t nxt_socket_setsockopt(nxt_task_t *task, nxt_socket_t s,