112 lines
3.3 KiB
Groff
112 lines
3.3 KiB
Groff
.\" Copyright (C) 1999 Matthew Dillon. 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 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 AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd January 22, 1999
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.Dt KVM_SWAPINFO 3
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.Os
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.Sh NAME
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.Nm kvm_getswapinfo
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.Nd return swap summary statistics for the system
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.Sh LIBRARY
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.Lb libkvm
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.Sh SYNOPSIS
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.In kvm.h
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.Ft int
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.Fn kvm_getswapinfo "kvm_t *kd" "struct kvm_swap *" "int maxswap" "int flags"
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.Sh DESCRIPTION
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The
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.Fn kvm_getswapinfo
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function fills an array of
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.Vt kvm_swap
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structures with swap summary
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information for each swap device, for up to
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.Fa maxswap
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\- 1 devices.
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The number of devices, up to
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.Fa maxswap
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\- 1, is returned.
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A grand
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total of all swap devices (including any devices that go beyond
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.Fa maxswap
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\- 1) is returned in one additional array entry.
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This
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entry is not counted in the return value.
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Thus, if you specify a
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.Fa maxswap
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value of 1, the function will typically return the
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value 0 and the single
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.Vt kvm_swap
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structure will be filled with
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the grand total over all swap devices.
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The grand total is calculated
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from all available swap devices whether or not you made room
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for them all in the array.
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The grand total is returned.
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.Pp
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The flags argument is currently unused and must be passed as 0.
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.Pp
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If an error occurs, -1 is returned.
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.Pp
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Each swap partition and the grand total is summarized in the
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.Vt kvm_swap
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structure.
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This structure contains the following fields:
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.Pp
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.Bl -item -offset indent -compact
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.It
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.Va char ksw_devname[] ;
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.It
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.Va int ksw_total ;
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.It
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.Va int ksw_used ;
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.It
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.Va int ksw_flags ;
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.El
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.Pp
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Values are in
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.Dv PAGE_SIZE Ns 'd
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chunks (see
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.Xr getpagesize 3 ) .
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.Va ksw_flags
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contains
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a copy of the swap device flags.
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.Sh CACHING
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This function caches the nlist values for various kernel variables which
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it reuses in successive calls.
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You may call the function with
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.Fa kd
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==
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.Dv NULL
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to clear the cache.
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.Sh DIAGNOSTICS
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If the load average was unobtainable, \-1 is returned; otherwise,
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the number of swap devices actually retrieved is returned.
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.Pp
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If the name of the swap device does not fit in the static char buffer
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in the structure, it is truncated.
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The buffer is always zero terminated.
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.Sh SEE ALSO
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.Xr kvm 3
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