.\"	$OpenBSD: kvm_getfiles.3,v 1.16 2013/10/22 16:40:27 guenther Exp $
.\"	$NetBSD: kvm_getfiles.3,v 1.3 1996/03/18 22:33:23 thorpej Exp $
.\"
.\" Copyright (c) 1992, 1993
.\"	The Regents of the University of California.  All rights reserved.
.\"
.\" This code is derived from software developed by the Computer Systems
.\" Engineering group at Lawrence Berkeley Laboratory under DARPA contract
.\" BG 91-66 and contributed to Berkeley.
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.\"     @(#)kvm_getfiles.3	8.2 (Berkeley) 4/19/94
.\"
.Dd $Mdocdate: October 22 2013 $
.Dt KVM_GETFILES 3
.Os
.Sh NAME
.Nm kvm_getfiles
.Nd survey open files
.Sh SYNOPSIS
.In kvm.h
.In sys/types.h
.In sys/sysctl.h
.Ft struct kinfo_file *
.Fn kvm_getfiles "kvm_t *kd" "int op" "int arg" "size_t elemsize" "int *cnt"
.Sh DESCRIPTION
.Fn kvm_getfiles
returns a (sub-)set of the open files in the kernel indicated by
.Fa kd .
The
.Fa op
and
.Fa arg
arguments constitute a predicate which limits the set of files
returned.
The value of
.Fa op
describes the filtering predicate as follows:
.Pp
.Bl -tag -width 20n -offset indent -compact
.It Dv KERN_FILE_BYFILE
all open files
.It Dv KERN_FILE_BYPID
files opened by process ID
.Fa arg
(\-1 for all processes)
.It Dv KERN_FILE_BYUID
files opened by processes with effective user ID
.Fa arg
.El
.Pp
Files associated with a process will include information about
the process that has the file open.
.Pp
Only the first
.Fa elemsize
bytes of each array entry are returned.
If the size of the
.Vt kinfo_file
structure increases in size in a future release of
.Ox ,
the kernel will only return the requested amount of data for
each array entry and programs that use
.Fn kvm_getfiles
will continue to function without the need for recompilation.
.Pp
The files are returned as a contiguous array of
.Vt kinfo_file
structures.
The number of structures found is returned in the reference parameter
.Fa cnt .
This memory is owned by kvm and will be overwritten by subsequent calls to
.Fn kvm_getfiles
and destroyed by
.Fn kvm_close .
Data should be copied out if it needs to be saved.
.Sh RETURN VALUES
.Fn kvm_getfiles
will return
.Dv NULL
on failure.
.Sh SEE ALSO
.Xr kvm 3 ,
.Xr kvm_geterr 3 ,
.Xr kvm_nlist 3 ,
.Xr kvm_open 3 ,
.Xr kvm_read 3
.Sh BUGS
This routine does not belong in the kvm interface.