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The C and C++ Include Header Files

/usr/include/x86_64-linux-gnu/bits/procfs-extra.h

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

     1	/* Extra sys/procfs.h definitions.  Generic Linux version.
     2	   Copyright (C) 2018-2024 Free Software Foundation, Inc.
     3	
     4	   This file is part of the GNU C Library.
     5	
     6	   The GNU C Library is free software; you can redistribute it and/or
     7	   modify it under the terms of the GNU Lesser General Public
     8	   License as published by the Free Software Foundation; either
     9	   version 2.1 of the License, or (at your option) any later version.
    10	
    11	   The GNU C Library is distributed in the hope that it will be useful,
    12	   but WITHOUT ANY WARRANTY; without even the implied warranty of
    13	   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    14	   Lesser General Public License for more details.
    15	
    16	   You should have received a copy of the GNU Lesser General Public
    17	   License along with the GNU C Library; if not, see
    18	   <https://www.gnu.org/licenses/>.  */
    19	
    20	#ifndef _SYS_PROCFS_H
    21	# error "Never include <bits/procfs-extra.h> directly; use <sys/procfs.h> instead."
    22	#endif

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