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The C and C++ Include Header Files

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

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

     1	/* System-specific extensions of <sys/mman.h>, Linux version.
     2	   Copyright (C) 2022-2024 Free Software Foundation, Inc.
     3	   This file is part of the GNU C Library.
     4	
     5	   The GNU C Library is free software; you can redistribute it and/or
     6	   modify it under the terms of the GNU Lesser General Public
     7	   License as published by the Free Software Foundation; either
     8	   version 2.1 of the License, or (at your option) any later version.
     9	
    10	   The GNU C Library is distributed in the hope that it will be useful,
    11	   but WITHOUT ANY WARRANTY; without even the implied warranty of
    12	   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13	   Lesser General Public License for more details.
    14	
    15	   You should have received a copy of the GNU Lesser General Public
    16	   License along with the GNU C Library; if not, see
    17	   <https://www.gnu.org/licenses/>.  */
    18	
    19	#ifndef _SYS_MMAN_H
    20	# error "Never include <bits/mman_ext.h> directly; use <sys/mman.h> instead."
    21	#endif
    22	
    23	#ifdef __USE_GNU
    24	struct iovec;
    25	extern __ssize_t process_madvise (int __pid_fd, const struct iovec *__iov,
    26					  size_t __count, int __advice,
    27					  unsigned __flags)
    28	  __THROW;
    29	
    30	extern int process_mrelease (int pidfd, unsigned int flags) __THROW;
    31	
    32	#endif /* __USE_GNU  */
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