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.\" Copyright (c) 2008 Peter Wemm
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.Dd May 27, 2015
.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 sys/user.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