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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 1.25 2019/12/11 20:01:50 bluhm Exp $
-.\"
-.Dd $Mdocdate: December 11 2019 $
-.Dt REALPATH 3
-.Os
-.Sh NAME
-.Nm realpath
-.Nd returns the canonicalized absolute pathname
-.Sh SYNOPSIS
-.In limits.h
-.In 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 components 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
-.Fn 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
-will fail if:
-.Bl -tag -width Er
-.It Bq Er EACCES
-Read or search permission was denied for a component of
-.Ar pathname .
-.It Bq Er EINVAL
-The
-.Ar pathname
-argument is a null pointer.
-.It Bq Er EIO
-An error occurred while reading from the file system.
-.It Bq Er ELOOP
-Too many symbolic links were encountered in translating
-.Ar pathname .
-.It Bq Er ENAMETOOLONG
-A component of
-.Ar pathname
-exceeded
-.Dv NAME_MAX
-characters, or the entire
-.Ar pathname
-(including the terminating NUL) exceeded
-.Dv PATH_MAX .
-.It Bq Er ENAMETOOLONG
-Pathname resolution of a symbolic link produced an intermediate
-result whose length exceeds
-.Dv PATH_MAX .
-.It Bq Er ENOENT
-A component of
-.Ar pathname
-does not name an existing file or
-.Ar pathname
-points to an empty string.
-.It Bq Er ENOTDIR
-A component of the path prefix is not a directory.
-.It Bq Er ENOMEM
-Sufficient storage space is unavailable for allocation.
-.El
-.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 .
-.Pp
-In
-.Ox 6.6 ,
-it was reimplemented on top of the
-.Fn __realpath
-system call.
-Its calling convention differs from the standard
-function by requiring
-.Ar resolved
-to not be
-.Dv NULL
-and by returning an integer,
-zero on success, and -1 with corresponding errno on failure.
-This is visible in the output of
-.Xr kdump 1 .