125 lines
3.5 KiB
Groff
125 lines
3.5 KiB
Groff
.\" 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. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 4. 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.
|
|
.\"
|
|
.\" @(#)realpath.3 8.2 (Berkeley) 2/16/94
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd February 16, 1994
|
|
.Dt REALPATH 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm realpath
|
|
.Nd returns the canonicalized absolute pathname
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In sys/param.h
|
|
.In stdlib.h
|
|
.Ft "char *"
|
|
.Fn realpath "const char *pathname" "char resolved_path[PATH_MAX]"
|
|
.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_path .
|
|
The
|
|
.Fa resolved_path
|
|
argument
|
|
.Em must
|
|
refer to a buffer capable of storing at least
|
|
.Dv PATH_MAX
|
|
characters.
|
|
.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_path
|
|
on success.
|
|
If an error occurs,
|
|
.Fn realpath
|
|
returns
|
|
.Dv NULL ,
|
|
and
|
|
.Fa resolved_path
|
|
contains the pathname which caused the problem.
|
|
.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 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_path
|
|
when given a relative
|
|
.Fa pathname .
|
|
.Sh "SEE ALSO"
|
|
.Xr getcwd 3
|
|
.Sh HISTORY
|
|
The
|
|
.Fn realpath
|
|
function first appeared in
|
|
.Bx 4.4 .
|