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+.\"     $NetBSD: pathbuf.9,v 1.2 2010/11/30 10:32:46 dholland Exp $
+.\"
+.\" Copyright (c) 2010 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by David A. Holland.
+.\"
+.\" 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+.\"
+.Dd November 30, 2010
+.Dt PATHBUF 9
+.Os
+.Sh NAME
+.Nm pathbuf ,
+.Nm pathbuf_create ,
+.Nm pathbuf_assimilate ,
+.Nm pathbuf_copyin ,
+.Nm pathbuf_destroy
+.Nd path buffer abstraction
+.Sh SYNOPSIS
+.In sys/namei.h
+.Ft struct pathbuf *
+.Fn pathbuf_create "const char *path"
+.Ft struct pathbuf *
+.Fn pathbuf_assimilate "char *pnbuf"
+.Ft int
+.Fn pathbuf_copyin "const char *userpath" "struct pathbuf **ret"
+.Ft void
+.Fn pathbuf_destroy "struct pathbuf *path"
+.Sh DESCRIPTION
+The
+.Nm
+interface is used to carry around pathnames.
+This helps simplify the
+.Xr namei 9
+interface.
+A pathbuf should be thought of as a path name string combined with
+whatever flags and metadata are needed to interpret it correctly.
+It is an abstract type; the internals are hidden within the
+.Xr namei 9
+implementation.
+.Pp
+The
+.Fn pathbuf_create
+function allocates and initializes a new pathbuf containing a copy of
+the path string
+.Fa path ,
+which should be a kernel pointer.
+The return value should be checked for being
+.Dv NULL
+in case the system is out of memory.
+Passing a path name larger than
+.Dv PATH_MAX
+will cause an assertion failure.
+.Pp
+The
+.Fn pathbuf_copyin
+function allocates and initializes a new pathbuf containing a path
+string copied from user space with
+.Xr copyinstr 9 .
+It returns an error code.
+.Pp
+The
+.Fn pathbuf_assimilate
+function creates a pathbuf using the string buffer provided as
+.Fa pnbuf .
+This buffer must be of size
+.Dv PATH_MAX
+and must have been allocated with
+.Fn PNBUF_GET .
+The buffer is
+.Dq taken over
+by the returned pathbuf and will be released when the pathbuf is
+destroyed.
+Note: to avoid confusion and pointer bugs,
+.Fn pathbuf_assimilate
+should only be used where absolutely necessary; e.g. the NFS server
+code uses it to generate pathbufs from strings fetched from mbufs.
+.Pp
+The
+.Fn pathbuf_destroy
+function deallocates a pathbuf.
+Caution: because calling
+.Xr namei 9
+loads pointers to memory belonging to the pathbuf into the nameidata
+structure, a pathbuf should only be destroyed by the
+.Fn namei
+caller once all manipulations of the nameidata are complete.
+.Pp
+Also note that calling
+.Fn namei
+destroys the contents of the pathbuf.
+Do not reuse a pathbuf for a second call to
+.Fn namei .
+.Sh CODE REFERENCES
+The
+.Nm
+code is part of the name lookup code in
+.Pa sys/kern/vfs_lookup.c .
+.Sh SEE ALSO
+.Xr namei 9
+.Sh BUGS
+There are cases where it is necessary to get the path string left
+behind after
+.Fn namei
+has run.
+This produces an effect similar to
+.Xr realpath 3 .
+The interface for doing this is, for the time being, intentionally
+undocumented and subject to change.