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sourceware.org Git - glibc.git/blob - sysdeps/unix/sysv/linux/ifreq.c
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1 /* Copyright (C) 1999,2002,2003,2004,2005,2006 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 <http://www.gnu.org/licenses/>. */
20 #include <kernel-features.h>
22 /* Variable to signal whether SIOCGIFCONF is not available. */
23 #if __ASSUME_SIOCGIFNAME == 0 || 1
24 static int old_siocgifconf
;
26 # define old_siocgifconf 0
31 __ifreq (struct ifreq
**ifreqs
, int *num_ifs
, int sockfd
)
50 /* We may be able to get the needed buffer size directly, rather than
52 if (! old_siocgifconf
)
56 if (__ioctl (fd
, SIOCGIFCONF
, &ifc
) < 0 || ifc
.ifc_len
== 0)
58 # if __ASSUME_SIOCGIFNAME == 0
61 rq_len
= RQ_IFS
* sizeof (struct ifreq
);
67 rq_len
= RQ_IFS
* sizeof (struct ifreq
);
69 /* Read all the interfaces out of the kernel. */
73 void *newp
= realloc (ifc
.ifc_buf
, ifc
.ifc_len
);
75 || (ifc
.ifc_buf
= newp
, __ioctl (fd
, SIOCGIFCONF
, &ifc
)) < 0)
87 if (!old_siocgifconf
|| ifc
.ifc_len
< rq_len
)
93 nifs
= ifc
.ifc_len
/ sizeof (struct ifreq
);
99 *ifreqs
= realloc (ifc
.ifc_buf
, nifs
* sizeof (struct ifreq
));
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