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https://sourceware.org/git/glibc.git
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6eaf10cbb7
It is not possible to use interface ioctls with netlink sockets
on all Linux kernels.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
(cherry picked from commit 3d981795cd)
43 lines
1.4 KiB
C
43 lines
1.4 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. */
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int type = SOCK_DGRAM | SOCK_CLOEXEC;
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int fd;
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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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