Better option for sockets in agent

Author: joelwurtz

src/ngx_http_redirectionio_module.c

@@ -1,5 +1,9 @@
 #include <ngx_http_redirectionio_module.h>
 
+ngx_http_output_header_filter_pt    ngx_http_next_header_filter;
+ngx_http_output_body_filter_pt      ngx_http_next_body_filter;
+ngx_module_t                        ngx_http_redirectionio_module;
+
 /**
  * List of values for boolean
  */

src/ngx_http_redirectionio_module.h

@@ -108,9 +108,9 @@ ngx_int_t ngx_http_redirectionio_headers_filter(ngx_http_request_t *r);
 
 ngx_int_t ngx_http_redirectionio_body_filter(ngx_http_request_t *r, ngx_chain_t *in);
 
-ngx_http_output_header_filter_pt    ngx_http_next_header_filter;
-ngx_http_output_body_filter_pt      ngx_http_next_body_filter;
-ngx_module_t                        ngx_http_redirectionio_module;
+extern ngx_http_output_header_filter_pt    ngx_http_next_header_filter;
+extern ngx_http_output_body_filter_pt      ngx_http_next_body_filter;
+extern ngx_module_t                        ngx_http_redirectionio_module;
 
 ngx_int_t ngx_http_redirectionio_pool_construct(void **resource, void *params);
 ngx_int_t ngx_http_redirectionio_pool_destruct(void *resource, void *params);

src/ngx_http_redirectionio_module_pool.c

@@ -53,6 +53,10 @@ ngx_int_t ngx_http_redirectionio_pool_construct(void **rp, void *params) {
         ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_socket_errno,  "setsockopt(TCP_NODELAY) %V failed, ignored", &resource->peer.connection->addr_text);
     }
 
+    if (setsockopt(resource->peer.connection->fd, IPPROTO_TCP, SO_KEEPALIVE, (const void *) &tcp_nodelay, sizeof(int)) == -1) {
+        ngx_log_error(NGX_LOG_ALERT, pool->log, ngx_socket_errno,  "setsockopt(SO_KEEPALIVE) %V failed, ignored", &resource->peer.connection->addr_text);
+    }
+
     resource->peer.connection->pool = pool;
     resource->peer.connection->read->handler = ngx_http_redirectionio_dummy_handler;
     resource->peer.connection->write->handler = ngx_http_redirectionio_dummy_handler;