mirror of
git://sourceware.org/git/glibc.git
synced 2024-11-27 03:41:23 +08:00
7f1deee65e
This implementation supports only IPv4. * inet/ifaddrs.h: New file. * sysdeps/generic/ifaddrs.c: New file. * sysdeps/gnu/ifaddrs.c: New file. * inet/test-ifaddrs.c: New file. * inet/Makefile (routines): Add ifaddrs. (headers): Add ifaddrs.h here. (tests): Add test-ifaddrs. * inet/Versions (GLIBC_2.3): New set, add getifaddrs and freeifaddrs. * resolv/res_hconf.c (_res_hconf_reorder_addrs): Use an explicit socket call to get an AF_INET socket, instead of using __opensock. The SIOCGIFNETMASK ioctl will work only with a PF_INET socket. * sysdeps/generic/ifreq.h (__ifreq): Take third argument SOCKFD, if not -1 use it instead of calling __opensock. * sysdeps/unix/sysv/linux/ifreq.h (__ifreq): Likewise. * sysdeps/mach/hurd/ifreq.h (__ifreq): Take new argument and ignore it. * resolv/res_hconf.c (_res_hconf_reorder_addrs): Pass new argument. * sysdeps/mach/hurd/ifreq.h: New file. * sysdeps/generic/ifreq.h (__if_freereq): Take second argument NUM_IFS. * sysdeps/unix/sysv/linux/ifreq.h (__if_freereq): Likewise. * resolv/res_hconf.c (_res_hconf_reorder_addrs): Update caller.
82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
/* Copyright (C) 1999,2002 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Andreas Jaeger <aj@suse.de>.
|
|
|
|
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 <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <net/if.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/ioctl.h>
|
|
|
|
|
|
static inline void
|
|
__ifreq (struct ifreq **ifreqs, int *num_ifs, int sockfd)
|
|
{
|
|
int fd = sockfd;
|
|
struct ifconf ifc;
|
|
int rq_len;
|
|
int nifs;
|
|
# define RQ_IFS 4
|
|
|
|
if (fd < 0)
|
|
fd = __opensock ();
|
|
if (fd < 0)
|
|
{
|
|
*num_ifs = 0;
|
|
*ifreqs = NULL;
|
|
return;
|
|
}
|
|
|
|
ifc.ifc_buf = NULL;
|
|
rq_len = RQ_IFS * sizeof (struct ifreq);
|
|
do
|
|
{
|
|
ifc.ifc_len = rq_len;
|
|
ifc.ifc_buf = realloc (ifc.ifc_buf, ifc.ifc_len);
|
|
if (ifc.ifc_buf == NULL || __ioctl (fd, SIOCGIFCONF, &ifc) < 0)
|
|
{
|
|
if (ifc.ifc_buf)
|
|
free (ifc.ifc_buf);
|
|
|
|
if (fd != sockfd)
|
|
__close (fd);
|
|
*num_ifs = 0;
|
|
*ifreqs = NULL;
|
|
return;
|
|
}
|
|
rq_len *= 2;
|
|
}
|
|
while (rq_len < sizeof (struct ifreq) + ifc.ifc_len);
|
|
|
|
nifs = ifc.ifc_len / sizeof (struct ifreq);
|
|
|
|
if (fd != sockfd)
|
|
__close (fd);
|
|
|
|
*num_ifs = nifs;
|
|
*ifreqs = realloc (ifc.ifc_buf, nifs * sizeof (struct ifreq));
|
|
}
|
|
|
|
|
|
static inline void
|
|
__if_freereq (struct ifreq *ifreqs, int num_ifs)
|
|
{
|
|
free (ifreqs);
|
|
}
|