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The C and C++ Include Header Files

/usr/include/x86_64-linux-gnu/sys/un.h


$ cat -n /usr/include/x86_64-linux-gnu/sys/un.h

     1	/* Copyright (C) 1991-2024 Free Software Foundation, Inc.
     2	   This file is part of the GNU C Library.
     3	
     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.
     8	
     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.
    13	
    14	   You should have received a copy of the GNU Lesser General Public
    15	   License along with the GNU C Library; if not, see
    16	   <https://www.gnu.org/licenses/>.  */
    17	
    18	#ifndef	_SYS_UN_H
    19	#define	_SYS_UN_H	1
    20	
    21	#include <sys/cdefs.h>
    22	
    23	/* Get the definition of the macro to define the common sockaddr members.  */
    24	#include <bits/sockaddr.h>
    25	
    26	__BEGIN_DECLS
    27	
    28	/* Structure describing the address of an AF_LOCAL (aka AF_UNIX) socket.  */
    29	struct sockaddr_un
    30	  {
    31	    __SOCKADDR_COMMON (sun_);
    32	    char sun_path[108];		/* Path name.  */
    33	  };
    34	
    35	
    36	#ifdef __USE_MISC
    37	# include <stddef.h>
    38	# include <string.h>		/* For prototype of `strlen'.  */
    39	
    40	/* Evaluate to actual length of the `sockaddr_un' structure.  */
    41	# define SUN_LEN(ptr) (offsetof (struct sockaddr_un, sun_path)		      \
    42			      + strlen ((ptr)->sun_path))
    43	#endif
    44	
    45	__END_DECLS
    46	
    47	#endif	/* sys/un.h  */