3 * Copyright (C) 2006 Simone Piccardi
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or (at
8 * your option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 /****************************************************************
22 * Routine to check if a TCP socket is closing
24 * Return 1 if the socket is closing, 0 if not and a negative value in
27 * Author: Simone Piccardi
30 ****************************************************************/
31 #include <sys/socket.h> /* socket constants, types and functions */
32 #include <netinet/in.h> /* IPv4 and IPv6 constants and types */
33 #include <netinet/tcp.h> /* TCP constants and types */
34 #include <errno.h> /* error definitions and routines */
36 int is_closing(int sock)
39 socklen_t len = sizeof(info);
40 if (getsockopt(sock, SOL_TCP, TCP_INFO, &info, &len) != -1) {
41 if (info.tcpi_state == TCP_CLOSE ||
42 info.tcpi_state == TCP_CLOSE_WAIT ||
43 info.tcpi_state == TCP_CLOSING) {