2009-09-19 18:01:32 +00:00
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.\" Copyright (c) 2009 Alan L. Cox <alc@cs.rice.edu>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\"
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.\" $FreeBSD$
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.\"
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2009-09-21 18:02:02 +00:00
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.Dd September 21, 2009
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2009-09-19 18:01:32 +00:00
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.Dt GETPAGESIZES 3
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.Os
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.Sh NAME
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.Nm getpagesizes
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.Nd "get system page sizes"
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/mman.h
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.Ft int
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.Fn getpagesizes "size_t pagesize[]" "int nelem"
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.Sh DESCRIPTION
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The
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.Fn getpagesizes
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function retrieves page size information from the system.
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When it is called with
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.Fa pagesize
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specified as
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.Dv NULL
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and
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.Fa nelem
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specified as 0, it returns the number of distinct page sizes that are
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supported by the system.
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Otherwise, it assigns up to
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.Fa nelem
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of the system-supported page sizes to consecutive elements of the
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array referenced by
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.Fa pagesize .
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These page sizes are expressed in bytes.
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In this case,
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.Fn getpagesizes
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returns the number of such page sizes that it assigned to the array.
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.Sh RETURN VALUES
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If successful, the
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.Fn getpagesizes
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function returns either the number of page sizes that are supported by
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the system or the number of supported page sizes that it assigned to
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the array referenced by
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.Fa pagesize .
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Otherwise, it returns the value\~\-1 and sets
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.Va errno
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to indicate the error.
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.Sh ERRORS
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The
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.Fn getpagesizes
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function will succeed unless:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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The
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.Fa pagesize
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argument is
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.Dv NULL
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and the
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.Fa nelem
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argument is non-zero.
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.It Bq Er EINVAL
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The
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.Fa nelem
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argument is less than zero.
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.El
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.Sh SEE ALSO
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.Xr getpagesize 3
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.Sh HISTORY
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The
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.Fn getpagesizes
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function first appeared in Solaris 9.
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This manual page was written in conjunction with a new but compatible
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implementation that was first released in
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.Fx 7.3 .
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2009-09-21 18:02:02 +00:00
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.Sh AUTHORS
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This manual page was written by
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.An Alan L. Cox Aq alc@cs.rice.edu .
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