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The C and C++ Include Header Files

/usr/include/x86_64-linux-gnu/bits/mqueue.h


$ cat -n /usr/include/x86_64-linux-gnu/bits/mqueue.h

     1	/* Copyright (C) 2004-2024 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 _MQUEUE_H
    19	# error "Never use <bits/mqueue.h> directly; include <mqueue.h> instead."
    20	#endif
    21	
    22	#include <bits/types.h>
    23	
    24	typedef int mqd_t;
    25	
    26	struct mq_attr
    27	{
    28	  __syscall_slong_t mq_flags;	/* Message queue flags.  */
    29	  __syscall_slong_t mq_maxmsg;	/* Maximum number of messages.  */
    30	  __syscall_slong_t mq_msgsize;	/* Maximum message size.  */
    31	  __syscall_slong_t mq_curmsgs;	/* Number of messages currently queued.  */
    32	  __syscall_slong_t __pad[4];
    33	};