b22750720f
.Sh "SEE ALSO" to: .Sh SEE ALSO The doc macros check for the latter (actually just for 'SEE' as the first argument to .Sh) to set the section header SEE ALSO flag, which modifies some behaviour (e.g. references done with .Rs/.Re).
130 lines
3.7 KiB
Groff
130 lines
3.7 KiB
Groff
.\" $NetBSD: realpath.3,v 1.5 1999/04/06 04:54:19 cgd Exp $
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.\"
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.\" Copyright (c) 1994
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" Jan-Simon Pendry.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)realpath.3 8.2 (Berkeley) 2/16/94
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.\"
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.Dd February 16, 1994
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.Dt REALPATH 3
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.Os
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.Sh NAME
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.Nm realpath
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.Nd returns the canonicalized absolute pathname
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.Fd #include <sys/param.h>
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.Fd #include <stdlib.h>
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.Ft "char *"
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.Fn realpath "const char *pathname" "char resolvedname[MAXPATHLEN]"
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.Sh DESCRIPTION
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The
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.Fn realpath
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function resolves all symbolic links, extra
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.Dq /
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characters and references to
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.Pa /./
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and
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.Pa /../
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in
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.Fa pathname ,
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and copies the resulting absolute pathname into
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the memory referenced by
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.Fa resolvedname .
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The
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.Fa resolvedname
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argument
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.Em must
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refer to a buffer capable of storing at least
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.Dv MAXPATHLEN
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characters.
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.Pp
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The
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.Fn realpath
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function will resolve both absolute and relative paths
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and return the absolute pathname corresponding to
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.Fa pathname .
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All but the last component of
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.Fa pathname
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must exist when
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.Fn realpath
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is called.
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.Sh "RETURN VALUES"
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The
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.Fn realpath
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function returns
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.Fa resolved_name
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on success.
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If an error occurs,
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.Fn realpath
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returns
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.Dv NULL ,
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and
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.Fa resolved_name
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contains the pathname which caused the problem.
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.Sh ERRORS
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The function
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.Fn realpath
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may fail and set the external variable
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.Va errno
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for any of the errors specified for the library functions
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.Xr chdir 2 ,
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.Xr close 2 ,
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.Xr fchdir 2 ,
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.Xr lstat 2 ,
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.Xr open 2 ,
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.Xr readlink 2
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and
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.Xr getcwd 3 .
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.Sh CAVEATS
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This implementation of
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.Fn realpath
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differs slightly from the Solaris implementation.
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The
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.Bx 4.4
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version always returns absolute pathnames,
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whereas the Solaris implementation will,
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under certain circumstances, return a relative
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.Fa resolved_path
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when given a relative
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.Fa pathname .
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.Sh SEE ALSO
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.Xr getcwd 3
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.Sh HISTORY
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The
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.Fn realpath
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function call first appeared in
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.Bx 4.4 .
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