1 /* Copyright (C) 1999-2021 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Andreas Jaeger <aj@suse.de>.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
23 __ifreq (struct ifreq
**ifreqs
, int *num_ifs
, int sockfd
)
41 rq_len
= RQ_IFS
* sizeof (struct ifreq
) / 2; /* Doubled in the loop. */
44 ifc
.ifc_len
= rq_len
*= 2;
45 void *newp
= realloc (ifc
.ifc_buf
, ifc
.ifc_len
);
46 if (newp
== NULL
|| __ioctl (fd
, SIOCGIFCONF
, &ifc
) < 0)
58 while (rq_len
< sizeof (struct ifreq
) + ifc
.ifc_len
);
64 struct ifreq
*ifr
= *ifreqs
;
66 while ((char *) ifr
< ifc
.ifc_buf
+ ifc
.ifc_len
)
69 ifr
= __if_nextreq (ifr
);
74 nifs
= ifc
.ifc_len
/ sizeof (struct ifreq
);
78 *ifreqs
= realloc (ifc
.ifc_buf
, nifs
* sizeof (struct ifreq
));