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.\"
.\" Copyright (c) 2008 Peter Wemm
.\" 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 THE 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 THE 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 December 6, 2008
.Dt KINFO_GETFILE 3
.Os
.Sh NAME
.Nm kinfo_getfile
.Nd function for getting per-process file descriptor information
.Sh LIBRARY
.Lb libutil
.Sh SYNOPSIS
.In sys/types.h
.In libutil.h
.Ft struct kinfo_file *
.Fn kinfo_getfile "pid_t pid" "int *cntp"
.Sh DESCRIPTION
This function is used for obtaining the file descriptor information
of a particular process.
.Pp
The
.Ar pid
field contains the process identifier.
This should be the a process that you have privilege to access.
The
.Ar cntp
field allows the caller to know how many records are returned.
.Pp
This function is a wrapper around
.Xr sysctl 3
with the
.Dv KERN_PROC_FILEDESC
mib.
While the kernel returns a packed structure, this function expands the
data into a fixed record format.
.Sh RETURN VALUES
On success the
.Fn kinfo_getfile
function returns a pointer to an array of
.Vt struct kinfo_file
structures as defined by
.In sys/user.h .
The array was obtained by an internal call to
.Xr malloc 3
and must be freed by the caller with a call to
.Xr free 3 .
On failure the
.Fn kinfo_getfile
function returns
.Dv NULL .
.Sh SEE ALSO
.Xr free 3 ,
.Xr kinfo_getvmmap 3 ,
.Xr malloc 3 ,
.Xr sysctl 3
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