2 * Detect file descriptor of a given GIOUnixChannel for libcaptive
3 * Copyright (C) 2003 Jan Kratochvil <project-captive@jankratochvil.net>
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; exactly version 2 of June 1991 is required
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include "iounixchannel.h" /* self */
23 #include <glib/gmessages.h>
24 #include <glib/giochannel.h>
25 #include <glib/gtypes.h>
30 static GIOChannel *iochannel_null;
32 int captive_iounixchannel_get_fd(GIOChannel *iochannel)
36 g_return_val_if_fail(iochannel!=NULL,-1);
38 if (!iochannel_null) {
41 fd=open("/dev/null",O_RDONLY);
42 g_return_val_if_fail(fd!=-1,-1);
43 iochannel_null=g_io_channel_unix_new(fd);
44 g_return_val_if_fail(iochannel_null!=NULL,-1);
47 if (iochannel->funcs!=iochannel_null->funcs) {
48 /* Not a UNIX file descriptor */
52 /* It is forbidden to callg_io_channel_unix_get_fd()
53 * if you are not sure it is a 'GIOUnixChannel'.
55 r=g_io_channel_unix_get_fd(iochannel);
56 g_return_val_if_fail(r!=-1,-1);