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.\" Copyright (C) 1999 Matthew Dillon. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $FreeBSD$
.\"
.Dd January 22, 1999
.Dt KVM_SWAPINFO 3
.Os
.Sh NAME
.Nm kvm_getswapinfo
.Nd return swap summary statistics for the system
.Sh LIBRARY
.Lb libkvm
.Sh SYNOPSIS
.In kvm.h
.Ft int
.Fn kvm_getswapinfo "kvm_t *kd" "struct kvm_swap *" "int maxswap" "int flags"
.Sh DESCRIPTION
The
.Fn kvm_getswapinfo
function fills an array of
.Vt kvm_swap
structures with swap summary
information for each swap device, for up to
.Fa maxswap
\- 1 devices.
The number of devices, up to
.Fa maxswap
\- 1, is returned.
A grand
total of all swap devices (including any devices that go beyond
.Fa maxswap
\- 1) is returned in one additional array entry.
This
entry is not counted in the return value.
Thus, if you specify a
.Fa maxswap
value of 1, the function will typically return the
value 0 and the single
.Vt kvm_swap
structure will be filled with
the grand total over all swap devices.
The grand total is calculated
from all available swap devices whether or not you made room
for them all in the array.
The grand total is returned.
.Pp
The flags argument is currently unused and must be passed as 0.
.Pp
If an error occurs, -1 is returned.
.Pp
Each swap partition and the grand total is summarized in the
.Vt kvm_swap
structure.
This structure contains the following fields:
.Pp
.Bl -item -offset indent -compact
.It
.Va char ksw_devname[] ;
.It
.Va int ksw_total ;
.It
.Va int ksw_used ;
.It
.Va int ksw_flags ;
.El
.Pp
Values are in
.Dv PAGE_SIZE Ns 'd
chunks (see
.Xr getpagesize 3 ) .
.Va ksw_flags
contains
a copy of the swap device flags.
.Sh CACHING
This function caches the nlist values for various kernel variables which
it reuses in successive calls.
You may call the function with
.Fa kd
==
.Dv NULL
to clear the cache.
.Sh DIAGNOSTICS
If the swap summary information was unobtainable, \-1 is returned;
otherwise, the number of swap devices actually retrieved is returned.
.Pp
If the name of the swap device does not fit in the static char buffer
in the structure, it is truncated.
The buffer is always zero terminated.
.Sh SEE ALSO
.Xr kvm 3
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