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/* Copyright (C) 2008 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by David Bartley <dtbartle@csclub.uwaterloo.ca>, 2008.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <net/if.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <stddef.h>
#include <string.h>
#include <not-cancel.h>
#include <memory.h>
void
__ifreq (struct ifreq **ifreqs, int *num_ifs, int sockfd)
{
struct ifconf ifc;
int nifs;
char *buf = NULL;
/* Determine number of interfaces. */
if (__ioctl (sockfd, SIOCGIFNUM, &nifs) != 0)
goto error;
/* Get interfaces. */
ifc.ifc_len = nifs * sizeof(struct ifreq);
buf = malloc (ifc.ifc_len);
ifc.ifc_buf = buf;
if (buf == NULL)
goto error;
if (__ioctl (sockfd, SIOCGIFCONF, &ifc) != 0)
goto error;
*ifreqs = (struct ifreq *)buf;
*num_ifs = nifs;
return;
error:
*ifreqs = NULL;
*num_ifs = 0;
free (buf);
}
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