Aggiunto esempio di uso di {{{TCP_INFO}}}

[gapil.git] / sources / is_closing.c

diff --git a/sources/is_closing.c b/sources/is_closing.c
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+/* 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;
+    }
+}