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+.\" Copyright (c) 1994
+.\"     The Regents of the University of California.  All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" Jan-Simon Pendry.
+.\"
+.\" 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.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+.\"
+.\"     $OpenBSD: realpath.3,v 1.17 2011/07/24 22:29:05 jmc Exp $
+.\"
+.Dd $Mdocdate: July 24 2011 $
+.Dt REALPATH 3
+.Os
+.Sh NAME
+.Nm realpath
+.Nd returns the canonicalized absolute pathname
+.Sh SYNOPSIS
+.Fd #include <limits.h>
+.Fd #include <stdlib.h>
+.Ft "char *"
+.Fn realpath "const char *pathname" "char *resolved"
+.Sh DESCRIPTION
+The
+.Fn realpath
+function resolves all symbolic links, extra
+.Dq /
+characters and references to
+.Pa /./
+and
+.Pa /../
+in
+.Fa pathname ,
+and copies the resulting absolute pathname into the memory referenced by
+.Fa resolved .
+The
+.Fa resolved
+argument
+.Em must
+refer to a buffer capable of storing at least
+.Dv PATH_MAX
+characters, or be
+.Dv NULL .
+.Pp
+The
+.Fn realpath
+function will resolve both absolute and relative paths
+and return the absolute pathname corresponding to
+.Fa pathname .
+All but the last component of
+.Fa pathname
+must exist when
+.Fn realpath
+is called.
+.Sh RETURN VALUES
+The
+.Fn realpath
+function returns
+.Fa resolved
+on success.
+If
+.Fa resolved
+is
+.Dv NULL
+and no error occurred, then
+.Fa realpath
+returns a NUL-terminated string in a newly allocated buffer.
+If an error occurs,
+.Fn realpath
+returns
+.Dv NULL
+and the contents of
+.Fa resolved
+are undefined.
+.Sh ERRORS
+The function
+.Fn realpath
+may fail and set the external variable
+.Va errno
+for any of the errors specified for the library functions
+.Xr lstat 2 ,
+.Xr readlink 2 ,
+and
+.Xr getcwd 3 .
+.Sh SEE ALSO
+.Xr readlink 1 ,
+.Xr getcwd 3
+.Sh STANDARDS
+The
+.Fn realpath
+function conforms to
+.St -p1003.1-2008 .
+.Sh HISTORY
+The
+.Fn realpath
+function call first appeared in
+.Bx 4.4 .
+.Sh CAVEATS
+This implementation of
+.Fn realpath
+differs slightly from the Solaris implementation.
+The
+.Bx 4.4
+version always returns absolute pathnames,
+whereas the Solaris implementation will,
+under certain circumstances, return a relative
+.Fa resolved
+when given a relative
+.Fa pathname .