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b168057a | 1 | /* Copyright (C) 1999-2015 Free Software Foundation, Inc. |
5d1f0a09 RM |
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 | ||
22 | void | |
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 | } |