added --so-keepalive

core/socket.c

@@ -586,6 +586,12 @@ int bind_to_tcp(char *socket_name, int listen_queue, char *tcp_port) {
 
 	}
 
+	if (uwsgi.so_keepalive) {
+		if (setsockopt(serverfd, SOL_SOCKET, SO_KEEPALIVE, &uwsgi.so_keepalive, sizeof(int))) {
+			uwsgi_error("setsockopt()");
+		}
+	}
+
 
 	if (bind(serverfd, (struct sockaddr *) &uws_addr, sizeof(uws_addr)) != 0) {
 		if (errno == EADDRINUSE) {

core/uwsgi.c

@@ -255,6 +255,7 @@ static struct uwsgi_option uwsgi_base_options[] = {
 	{"no-server", no_argument, 0, "force no-server mode", uwsgi_opt_true, &uwsgi.no_server, 0},
 	{"command-mode", no_argument, 0, "force command mode", uwsgi_opt_true, &uwsgi.command_mode, UWSGI_OPT_IMMEDIATE},
 	{"no-defer-accept", no_argument, 0, "disable deferred-accept on sockets", uwsgi_opt_true, &uwsgi.no_defer_accept, 0},
+	{"so-keepalive", no_argument, 0, "enable TCP KEEPALIVEs", uwsgi_opt_true, &uwsgi.so_keepalive, 0},
 	{"limit-as", required_argument, 0, "limit processes address space/vsz", uwsgi_opt_set_megabytes, &uwsgi.rl.rlim_max, 0},
 	{"limit-nproc", required_argument, 0, "limit the number of spawnable processes", uwsgi_opt_set_int, &uwsgi.rl_nproc.rlim_max, 0},
 	{"reload-on-as", required_argument, 0, "reload if address space is higher than specified megabytes", uwsgi_opt_set_megabytes, &uwsgi.reload_on_as, UWSGI_OPT_MEMORY},

uwsgi.h

@@ -1504,6 +1504,7 @@ struct uwsgi_server {
 	int vassal_sos_backlog;
 
 	int no_defer_accept;
+	int so_keepalive;
 
 	int page_size;