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71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
/* Copyright (C) 1999-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <sys/socket.h>
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#include <libc-lock.h>
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/* Return a socket of any type. The socket can be used in subsequent
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ioctl calls to talk to the kernel. */
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int
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__opensock (void)
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{
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/* Cache the last AF that worked, to avoid many redundant calls to
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socket(). */
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static int sock_af = -1;
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int fd = -1;
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__libc_lock_define_initialized (static, lock);
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if (sock_af != -1)
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{
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fd = __socket (sock_af, SOCK_DGRAM, 0);
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if (fd != -1)
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return fd;
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}
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__libc_lock_lock (lock);
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if (sock_af != -1)
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fd = __socket (sock_af, SOCK_DGRAM, 0);
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if (fd == -1)
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{
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#ifdef AF_INET
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fd = __socket (sock_af = AF_INET, SOCK_DGRAM, 0);
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#endif
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#ifdef AF_INET6
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if (fd < 0)
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fd = __socket (sock_af = AF_INET6, SOCK_DGRAM, 0);
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#endif
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#ifdef AF_IPX
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if (fd < 0)
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fd = __socket (sock_af = AF_IPX, SOCK_DGRAM, 0);
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#endif
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#ifdef AF_AX25
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if (fd < 0)
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fd = __socket (sock_af = AF_AX25, SOCK_DGRAM, 0);
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#endif
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#ifdef AF_APPLETALK
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if (fd < 0)
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fd = __socket (sock_af = AF_APPLETALK, SOCK_DGRAM, 0);
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#endif
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}
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__libc_lock_unlock (lock);
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return fd;
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}
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