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The C and C++ Include Header Files

cat -n /usr/include/netiucv/iucv.h

     1	/* Copyright (C) 2007-2026 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 __NETIUCV_IUCV_H
    19	#define __NETIUCV_IUCV_H	1
    20	
    21	#include <features.h>
    22	#include <bits/sockaddr.h>
    23	
    24	__BEGIN_DECLS
    25	
    26	struct __attribute_struct_may_alias__ sockaddr_iucv
    27	  {
    28	    __SOCKADDR_COMMON (siucv_);
    29	    unsigned short	siucv_port;		/* Reserved */
    30	    unsigned int	siucv_addr;		/* Reserved */
    31	    char		siucv_nodeid[8];	/* Reserved */
    32	    char		siucv_user_id[8];	/* Guest User Id */
    33	    char		siucv_name[8];		/* Application Name */
    34	  };
    35	
    36	__END_DECLS
    37	
    38	#define SOL_IUCV        277			/* IUCV level */
    39	
    40	/* IUCV socket options (SOL_IUCV) */
    41	#define SO_IPRMDATA_MSG	0x0080			/* Send/recv IPRM_DATA msgs */
    42	#define SO_MSGLIMIT	0x1000			/* Get/set IUCV MSGLIMIT */
    43	#define SO_MSGSIZE	0x0800			/* Get maximum msgsize */
    44	
    45	/* IUCV related control messages (scm) */
    46	#define SCM_IUCV_TRGCLS	0x0001			/* Target class control message */
    47	
    48	#endif