+/* is_closing.c
+ *
+ * Copyright (C) 2006 Simone Piccardi
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+/****************************************************************
+ *
+ * Routine is_closing
+ * Routine to check if a TCP socket is closing
+ *
+ * Return 1 if the socket is closing, 0 if not and a negative value in
+ * case of errors
+ *
+ * Author: Simone Piccardi
+ * Sep. 2006
+ *
+ * $Id$
+ *
+ ****************************************************************/
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <errno.h> /* error code */
+#
+int is_closing(int sock)
+{
+ int err;
+ struct tcp_info info;
+ socklen_t len = sizeof(info);
+ if (getsockopt(sock, SOL_TCP, TCP_INFO, &info, &len) != -1) {
+ if (info.tcpi_state == TCP_CLOSE ||
+ info.tcpi_state == TCP_CLOSE_WAIT ||
+ info.tcpi_state == TCP_CLOSING) {
+ return 1;
+ } else {
+ return 0;
+ }
+ } else {
+ return errno;
+ }
+}