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1/* Copyright (C) 1999-2019 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Andreas Jaeger <aj@suse.de>.
4
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.
9
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.
14
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/>. */
18
19#include "ifreq.h"
20
21
22void
23__ifreq (struct ifreq **ifreqs, int *num_ifs, int sockfd)
24{
25 int fd = sockfd;
26 struct ifconf ifc;
27 int rq_len;
28 int nifs;
29# define RQ_IFS 4
30
31 if (fd < 0)
32 fd = __opensock ();
33 if (fd < 0)
34 {
35 *num_ifs = 0;
36 *ifreqs = NULL;
37 return;
38 }
39
40 ifc.ifc_buf = NULL;
41 rq_len = RQ_IFS * sizeof (struct ifreq) / 2; /* Doubled in the loop. */
42 do
43 {
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)
47 {
48 free (ifc.ifc_buf);
49
50 if (fd != sockfd)
51 __close (fd);
52 *num_ifs = 0;
53 *ifreqs = NULL;
54 return;
55 }
56 ifc.ifc_buf = newp;
57 }
58 while (rq_len < sizeof (struct ifreq) + ifc.ifc_len);
59
60 if (fd != sockfd)
61 __close (fd);
62
63#ifdef _HAVE_SA_LEN
64 struct ifreq *ifr = *ifreqs;
65 nifs = 0;
66 while ((char *) ifr < ifc.ifc_buf + ifc.ifc_len)
67 {
68 ++nifs;
69 ifr = __if_nextreq (ifr);
70 if (ifr == NULL)
71 break;
72 }
73#else
74 nifs = ifc.ifc_len / sizeof (struct ifreq);
75#endif
76
77 *num_ifs = nifs;
78 *ifreqs = realloc (ifc.ifc_buf, nifs * sizeof (struct ifreq));
79}
80

Warning: That file was not part of the compilation database. It may have many parsing errors.