f14fb60209
* Updating common/lib * Updating lib/csu * Updating lib/libc * Updating libexec/ld.elf_so * Corrected test on __minix in featuretest to actually follow the meaning of the comment. * Cleaned up _REENTRANT-related defintions. * Disabled -D_REENTRANT for libfetch * Removing some unneeded __NBSD_LIBC defines and tests Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2
143 lines
3.7 KiB
Groff
143 lines
3.7 KiB
Groff
.\" $NetBSD: realpath.3,v 1.14 2012/06/21 21:35:25 wiz 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. 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 June 21, 2012
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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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.In sys/param.h
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.In stdlib.h
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.Ft "char *"
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.Fn realpath "const char * restrict pathname" "char * restrict resolvedname"
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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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.Sh RETURN VALUES
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If
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.Fa resolvednamed
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is
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.Dv NULL ,
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it will be allocated and the returned pointer can be deallocated using
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.Xr free 3 .
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The
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.Fn realpath
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function returns
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.Fa resolvedname
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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 resolvedname
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was not allocated by
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.Nm ,
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it will contain 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 malloc 3 ,
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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 SEE ALSO
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.Xr getcwd 3
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.Sh STANDARDS
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.Fn realpath
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first appeared in
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.St -xpg4.2
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and is part of
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.St -p1003.1-2001 .
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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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In
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.Nx 7.0
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the function was updated to accept a
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.Dv NULL
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pointer for the
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.Fa resolvedname
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argument.
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.Sh BUGS
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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 resolvedname
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when given a relative
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.Fa pathname .
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