* include/sys/mman.h: Mark madvise hidden.
[glibc.git] / socket / opensock.c
blob4a4d5dd38542e95df6f86208825c6ab792e84464
1 /* Copyright (C) 1999 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
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.
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
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17 02111-1307 USA. */
19 #include <stdio.h>
20 #include <sys/socket.h>
21 #include <bits/libc-lock.h>
23 /* Return a socket of any type. The socket can be used in subsequent
24 ioctl calls to talk to the kernel. */
25 int internal_function
26 __opensock (void)
28 /* Cache the last AF that worked, to avoid many redundant calls to
29 socket(). */
30 static int sock_af = -1;
31 int fd = -1;
32 __libc_lock_define_initialized (static, lock);
34 if (sock_af != -1)
36 fd = __socket (sock_af, SOCK_DGRAM, 0);
37 if (fd != -1)
38 return fd;
41 __libc_lock_lock (lock);
43 if (sock_af != -1)
44 fd = __socket (sock_af, SOCK_DGRAM, 0);
46 if (fd == -1)
48 #ifdef AF_INET
49 fd = __socket (sock_af = AF_INET, SOCK_DGRAM, 0);
50 #endif
51 #ifdef AF_INET6
52 if (fd < 0)
53 fd = __socket (sock_af = AF_INET6, SOCK_DGRAM, 0);
54 #endif
55 #ifdef AF_IPX
56 if (fd < 0)
57 fd = __socket (sock_af = AF_IPX, SOCK_DGRAM, 0);
58 #endif
59 #ifdef AF_AX25
60 if (fd < 0)
61 fd = __socket (sock_af = AF_AX25, SOCK_DGRAM, 0);
62 #endif
63 #ifdef AF_APPLETALK
64 if (fd < 0)
65 fd = __socket (sock_af = AF_APPLETALK, SOCK_DGRAM, 0);
66 #endif
69 __libc_lock_unlock (lock);
70 return fd;