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5bf07e1b3a
AF_NETLINK support is not quite optional on modern Linux systems anymore, so it is likely that the first attempt will always succeed. Consequently, there is no need to cache the result. Keep AF_UNIX and the Internet address families as a fallback, for the rare case that AF_NETLINK is missing. The other address families previously probed are totally obsolete be now, so remove them. Use this simplified version as the generic implementation, disabling Netlink support as needed.
50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
/* Create socket with an unspecified address family for use with ioctl.
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Copyright (C) 1999-2021 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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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <sys/socket.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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/* SOCK_DGRAM is supported by all address families. (Netlink does
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not support SOCK_STREAM.) */
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int type = SOCK_DGRAM | SOCK_CLOEXEC;
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int fd;
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#ifdef AF_NETLINK
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fd = __socket (AF_NETLINK, type, 0);
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if (fd >= 0)
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return fd;
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#endif
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fd = __socket (AF_UNIX, type, 0);
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if (fd >= 0)
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return fd;
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fd = __socket (AF_INET, type, 0);
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if (fd >= 0)
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return fd;
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fd = __socket (AF_INET6, type, 0);
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if (fd >= 0)
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return fd;
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__set_errno (ENOENT);
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return fd;
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}
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