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04277e02 | 1 | /* Copyright (C) 1999-2019 Free Software Foundation, Inc. |
41bdb6e2 | 2 | This file is part of the GNU C Library. |
f720d3d2 UD |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
f720d3d2 UD |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
f720d3d2 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
f720d3d2 UD |
17 | |
18 | #include <stdio.h> | |
19 | #include <sys/socket.h> | |
ec999b8e | 20 | #include <libc-lock.h> |
f720d3d2 UD |
21 | |
22 | /* Return a socket of any type. The socket can be used in subsequent | |
23 | ioctl calls to talk to the kernel. */ | |
038d1caf | 24 | int |
f720d3d2 UD |
25 | __opensock (void) |
26 | { | |
27 | /* Cache the last AF that worked, to avoid many redundant calls to | |
28 | socket(). */ | |
29 | static int sock_af = -1; | |
30 | int fd = -1; | |
31 | __libc_lock_define_initialized (static, lock); | |
32 | ||
33 | if (sock_af != -1) | |
34 | { | |
35 | fd = __socket (sock_af, SOCK_DGRAM, 0); | |
36 | if (fd != -1) | |
37 | return fd; | |
38 | } | |
39 | ||
40 | __libc_lock_lock (lock); | |
41 | ||
42 | if (sock_af != -1) | |
43 | fd = __socket (sock_af, SOCK_DGRAM, 0); | |
44 | ||
45 | if (fd == -1) | |
46 | { | |
47 | #ifdef AF_INET | |
48 | fd = __socket (sock_af = AF_INET, SOCK_DGRAM, 0); | |
49 | #endif | |
50 | #ifdef AF_INET6 | |
51 | if (fd < 0) | |
52 | fd = __socket (sock_af = AF_INET6, SOCK_DGRAM, 0); | |
53 | #endif | |
54 | #ifdef AF_IPX | |
55 | if (fd < 0) | |
56 | fd = __socket (sock_af = AF_IPX, SOCK_DGRAM, 0); | |
57 | #endif | |
58 | #ifdef AF_AX25 | |
59 | if (fd < 0) | |
60 | fd = __socket (sock_af = AF_AX25, SOCK_DGRAM, 0); | |
61 | #endif | |
62 | #ifdef AF_APPLETALK | |
63 | if (fd < 0) | |
64 | fd = __socket (sock_af = AF_APPLETALK, SOCK_DGRAM, 0); | |
65 | #endif | |
66 | } | |
67 | ||
68 | __libc_lock_unlock (lock); | |
69 | return fd; | |
70 | } |