luaa: send back but do not block (FS#338)

Signed-off-by: Julien Danjou <julien@danjou.info>

luaa.c

@@ -907,8 +907,16 @@ luaA_cb(EV_P_ ev_io *w, int revents)
         s = lua_tolstring(globalconf.L, -1, &len);
 
         /* ignore ENOENT because the client may not read */
-        if (send(w->fd, s, len, 0) == -1 && errno != ENOENT)
-            warn("can't send back to client via domain socket: %s", strerror(errno));
+        if (send(w->fd, s, len, MSG_DONTWAIT) == -1)
+           switch(errno)
+           {
+             case ENOENT:
+             case EAGAIN:
+               break;
+             default:
+                warn("can't send back to client via domain socket: %s", strerror(errno));
+                break;
+           }
 
         lua_pop(globalconf.L, 1); /* pop the string */
     }