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This supports common coding patterns. The GCC C front end before version 7 rejects the may_alias attribute on a struct definition if it was not present in a previous forward declaration, so this attribute can only be conditionally applied. This implements the spirit of the change in Austin Group issue 1641. Suggested-by: Marek Polacek <polacek@redhat.com> Suggested-by: Jakub Jelinek <jakub@redhat.com> Reviewed-by: Sam James <sam@gentoo.org> Reviewed-by: Carlos O'Donell <carlos@redhat.com>
48 lines
1.5 KiB
C
48 lines
1.5 KiB
C
/* Copyright (C) 1991-2024 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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#ifndef _SYS_UN_H
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#define _SYS_UN_H 1
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#include <sys/cdefs.h>
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/* Get the definition of the macro to define the common sockaddr members. */
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#include <bits/sockaddr.h>
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__BEGIN_DECLS
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/* Structure describing the address of an AF_LOCAL (aka AF_UNIX) socket. */
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struct __attribute_struct_may_alias__ sockaddr_un
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{
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__SOCKADDR_COMMON (sun_);
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char sun_path[108]; /* Path name. */
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};
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#ifdef __USE_MISC
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# include <stddef.h>
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# include <string.h> /* For prototype of `strlen'. */
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/* Evaluate to actual length of the `sockaddr_un' structure. */
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# define SUN_LEN(ptr) (offsetof (struct sockaddr_un, sun_path) \
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+ strlen ((ptr)->sun_path))
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#endif
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__END_DECLS
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#endif /* sys/un.h */
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