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POSIX_MADVISE(3P)	   POSIX Programmer's Manual	     POSIX_MADVISE(3P)

       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

       posix_madvise —	memory	advisory  information  and  alignment  control

       #include <sys/mman.h>

       int posix_madvise(void *addr, size_t len, int advice);

       The  posix_madvise()  function  shall  advise the implementation on the
       expected behavior of the application with respect to the	 data  in  the
       memory  starting	 at  address  addr,  and continuing for len bytes. The
       implementation may use this information to  optimize  handling  of  the
       specified  data.	 The  posix_madvise() function shall have no effect on
       the semantics of access to memory in the specified range,  although  it
       may affect the performance of access.

       The  implementation  may	 require  that	addr be a multiple of the page
       size, which is the value returned by  sysconf()	when  the  name	 value
       _SC_PAGESIZE is used.

       The advice to be applied to the memory range is specified by the advice
       parameter and may be one of the following values:

	     Specifies that the application has	 no  advice  to	 give  on  its
	     behavior  with  respect to the specified range. It is the default
	     characteristic if no advice is given for a range of memory.

	     Specifies that the application expects to	access	the  specified
	     range sequentially from lower addresses to higher addresses.

	     Specifies	that  the  application expects to access the specified
	     range in a random order.

	     Specifies that the application expects to	access	the  specified
	     range in the near future.

	     Specifies	that  the  application expects that it will not access
	     the specified range in the near future.

       These values are defined in the <sys/mman.h> header.

       Upon successful completion, posix_madvise() shall return	 zero;	other‐
       wise, an error number shall be returned to indicate the error.

       The posix_madvise() function shall fail if:

       EINVAL The value of advice is invalid.

       ENOMEM Addresses	 in  the range starting at addr and continuing for len
	      bytes are partly or completely outside the range allowed for the
	      address space of the calling process.

       The posix_madvise() function may fail if:

       EINVAL The  value  of  addr  is not a multiple of the value returned by
	      sysconf() when the name value _SC_PAGESIZE is used.

       EINVAL The value of len is zero.

       The following sections are informative.


       The posix_madvise() function is part of the Advisory Information option
       and need not be provided on all implementations.



       mmap(), posix_fadvise(), sysconf()

       The Base Definitions volume of POSIX.1‐2008, <sys_mman.h>

       Portions	 of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
       cal  and	 Electronics  Engineers,  Inc  and  The	 Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum	 1  applied.)  In  the
       event of any discrepancy between this version and the original IEEE and
       The Open Group Standard, the original IEEE and The Open Group  Standard
       is  the	referee document. The original Standard can be obtained online
       at http://www.unix.org/online.html .

       Any typographical or formatting errors that appear  in  this  page  are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors,	 see  https://www.ker‐
       nel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group		     2013		     POSIX_MADVISE(3P)

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