madvise man page on HP-UX

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madvise(2)							    madvise(2)

NAME
       madvise() - advise the system of a process's expected paging behavior

SYNOPSIS
DESCRIPTION
       The  system  call  permits  a  process  to  advise the system about its
       expected future behavior in referencing a  mapped  file,	 an  anonymous
       memory  region, or a shared memory region.  Certain implementations can
       use this information to optimize the use of resources.

       addr and len specify the address and length in bytes of the  region  to
       which  the advice refers.  For the address and length must be contained
       within a successful call to (see mmap(2)) or a successful call to  (see
       shmat(2)); otherwise, fails with an [EINVAL] error.

       The behav argument is one the following flags defined in the header
	      Removes  any  previous advice and sets the default behavior.  By
	      default, the kernel tracks access patterns on data  objects  and
	      performs	I/Os based on process trends (that is, sequential ver‐
	      sus random).  Sequential trends cause larger "read-ahead"	 I/Os,
	      while random accesses reduce the amount of I/O to avoid unneces‐
	      sary I/O.

	      Informs the kernel that any objects mapped in this range
		     will be accessed in a random  matter.   The  kernel  will
		     read  only the minimal amount of data to satisfy the user
		     fault.

	      Informs the kernel that any objects mapped in this range
		     will be accessed in a sequential matter.  The kernel will
		     perform the maximum read-ahead for every fault.  The ker‐
		     nel does not pay attention to access patterns and trends,
		     but instead assumes sequentiality for every access on the
		     object.

	      Informs the kernel that the specified range
		     is no longer needed by the process.  This allows the ker‐
		     nel  to  release  the  physical  pages associated with an
		     address range back to the system for use  by  other  pro‐
		     cesses.

		     is	 restricted to object ranges created with calls to and
		     Attempting to use on an object that was not created using
		     a	call  to  or will result in [EINVAL] being returned to
		     the caller.

	      Will need these pages.

	      Ensure that resources are reserved.

WARNINGS
       The current implementation of defines and as null operations.

RETURN VALUE
       returns the following values:

	      Successful completion.
	      Failure.
		     is set to indicate the error.

ERRORS
       If fails, is set to one of the following values.

	      [EFAULT]	     The  range	 specified  by	(addr,	addr+len)   is
			     invalid for a process's address space, or permis‐
			     sion was incorrect on the object  for  the	 behav
			     specified.

	      [EINVAL]	     behav contains an invalid value, or addr is not a
			     multiple of the page size as returned by the sys‐
			     tem call

	      [EINVAL]	     The  address  range specified by addr and len was
			     not created by a successful call to or

AUTHOR
       was developed by HP and OSF.

SEE ALSO
       mmap(2), sysconf(2).

STANDARDS CONFORMANCE
								    madvise(2)
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