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/* Copyright (C) 1997-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <alloca.h>
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#include <errno.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <net/if.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <libc-lock.h>
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#include <not-cancel.h>
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#include "netlinkaccess.h"
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unsigned int
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__if_nametoindex (const char *ifname)
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{
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#ifndef SIOCGIFINDEX
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__set_errno (ENOSYS);
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return 0;
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#else
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struct ifreq ifr;
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if (strlen (ifname) >= IFNAMSIZ)
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{
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__set_errno (ENODEV);
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return 0;
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}
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strncpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
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899fe5 |
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int fd = __opensock ();
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if (fd < 0)
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return 0;
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899fe5 |
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if (__ioctl (fd, SIOCGIFINDEX, &ifr) < 0)
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{
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int saved_errno = errno;
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__close_nocancel_nostatus (fd);
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if (saved_errno == EINVAL)
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__set_errno (ENOSYS);
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return 0;
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}
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__close_nocancel_nostatus (fd);
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return ifr.ifr_ifindex;
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#endif
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}
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libc_hidden_def (__if_nametoindex)
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weak_alias (__if_nametoindex, if_nametoindex)
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libc_hidden_weak (if_nametoindex)
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void
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__if_freenameindex (struct if_nameindex *ifn)
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{
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struct if_nameindex *ptr = ifn;
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while (ptr->if_name || ptr->if_index)
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{
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free (ptr->if_name);
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++ptr;
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}
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free (ifn);
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}
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libc_hidden_def (__if_freenameindex)
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weak_alias (__if_freenameindex, if_freenameindex)
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libc_hidden_weak (if_freenameindex)
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static struct if_nameindex *
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if_nameindex_netlink (void)
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{
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struct netlink_handle nh = { 0, 0, 0, NULL, NULL };
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struct if_nameindex *idx = NULL;
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if (__netlink_open (&nh) < 0)
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return NULL;
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/* Tell the kernel that we wish to get a list of all
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active interfaces. Collect all data for every interface. */
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if (__netlink_request (&nh, RTM_GETLINK) < 0)
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goto exit_free;
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/* Count the interfaces. */
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unsigned int nifs = 0;
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for (struct netlink_res *nlp = nh.nlm_list; nlp; nlp = nlp->next)
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{
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struct nlmsghdr *nlh;
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size_t size = nlp->size;
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if (nlp->nlh == NULL)
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continue;
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/* Walk through all entries we got from the kernel and look, which
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message type they contain. */
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for (nlh = nlp->nlh; NLMSG_OK (nlh, size); nlh = NLMSG_NEXT (nlh, size))
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{
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/* Check if the message is what we want. */
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if ((pid_t) nlh->nlmsg_pid != nh.pid || nlh->nlmsg_seq != nlp->seq)
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continue;
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if (nlh->nlmsg_type == NLMSG_DONE)
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break; /* ok */
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if (nlh->nlmsg_type == RTM_NEWLINK)
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++nifs;
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}
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}
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idx = malloc ((nifs + 1) * sizeof (struct if_nameindex));
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if (idx == NULL)
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{
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nomem:
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__set_errno (ENOBUFS);
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goto exit_free;
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}
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/* Add the interfaces. */
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nifs = 0;
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for (struct netlink_res *nlp = nh.nlm_list; nlp; nlp = nlp->next)
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{
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struct nlmsghdr *nlh;
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size_t size = nlp->size;
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if (nlp->nlh == NULL)
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continue;
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/* Walk through all entries we got from the kernel and look, which
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message type they contain. */
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for (nlh = nlp->nlh; NLMSG_OK (nlh, size); nlh = NLMSG_NEXT (nlh, size))
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{
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/* Check if the message is what we want. */
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if ((pid_t) nlh->nlmsg_pid != nh.pid || nlh->nlmsg_seq != nlp->seq)
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continue;
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if (nlh->nlmsg_type == NLMSG_DONE)
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break; /* ok */
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if (nlh->nlmsg_type == RTM_NEWLINK)
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{
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struct ifinfomsg *ifim = (struct ifinfomsg *) NLMSG_DATA (nlh);
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struct rtattr *rta = IFLA_RTA (ifim);
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size_t rtasize = IFLA_PAYLOAD (nlh);
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idx[nifs].if_index = ifim->ifi_index;
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while (RTA_OK (rta, rtasize))
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{
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char *rta_data = RTA_DATA (rta);
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size_t rta_payload = RTA_PAYLOAD (rta);
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if (rta->rta_type == IFLA_IFNAME)
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{
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idx[nifs].if_name = __strndup (rta_data, rta_payload);
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if (idx[nifs].if_name == NULL)
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{
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idx[nifs].if_index = 0;
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__if_freenameindex (idx);
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idx = NULL;
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goto nomem;
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}
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break;
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}
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rta = RTA_NEXT (rta, rtasize);
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}
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++nifs;
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}
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}
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}
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idx[nifs].if_index = 0;
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idx[nifs].if_name = NULL;
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exit_free:
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__netlink_free_handle (&nh);
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__netlink_close (&nh);
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return idx;
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}
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struct if_nameindex *
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__if_nameindex (void)
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{
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#ifndef SIOCGIFINDEX
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__set_errno (ENOSYS);
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return NULL;
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#else
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struct if_nameindex *result = if_nameindex_netlink ();
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return result;
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#endif
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}
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weak_alias (__if_nameindex, if_nameindex)
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libc_hidden_weak (if_nameindex)
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char *
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__if_indextoname (unsigned int ifindex, char *ifname)
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{
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/* We may be able to do the conversion directly, rather than searching a
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list. This ioctl is not present in kernels before version 2.1.50. */
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struct ifreq ifr;
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int fd;
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int status;
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fd = __opensock ();
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if (fd < 0)
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return NULL;
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ifr.ifr_ifindex = ifindex;
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status = __ioctl (fd, SIOCGIFNAME, &ifr);
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__close_nocancel_nostatus (fd);
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if (status < 0)
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{
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if (errno == ENODEV)
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/* POSIX requires ENXIO. */
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__set_errno (ENXIO);
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return NULL;
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}
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else
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return strncpy (ifname, ifr.ifr_name, IFNAMSIZ);
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}
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weak_alias (__if_indextoname, if_indextoname)
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libc_hidden_weak (if_indextoname)
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