84d9c625bf
- Fix for possible unset uid/gid in toproto
- Fix for default mtree style
- Update libelf
- Importing libexecinfo
- Resynchronize GCC, mpc, gmp, mpfr
- build.sh: Replace params with show-params.
This has been done as the make target has been renamed in the same
way, while a new target named params has been added. This new
target generates a file containing all the parameters, instead of
printing it on the console.
- Update test48 with new etc/services (Fix by Ben Gras <ben@minix3.org)
get getservbyport() out of the inner loop
Change-Id: Ie6ad5226fa2621ff9f0dee8782ea48f9443d2091
164 lines
4.2 KiB
Groff
164 lines
4.2 KiB
Groff
.\" $NetBSD: realpath.3,v 1.18 2013/05/24 09:35:11 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 May 24, 2013
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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, or be
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.Dv NULL .
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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 resolvedname
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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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.Fn realpath ,
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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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.\" First sorted by section, then by name.
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.Xr lstat 2 ,
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.Xr readlink 2 ,
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.Xr getcwd 3
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and
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.Xr malloc 3 .
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.Pp
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In addition, the following errors may be reported:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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The value of the
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.Fa pathname
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argument is
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.Dv NULL .
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.It Bq Er ELOOP
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Too many symbolic links were encountered in translating the
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.Fa pathname .
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.It Bq Er ENAMETOOLONG
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The resulting absolute pathname exceeds
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.Dv MAXPATHLEN
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characters.
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.It Bq Er ENOENT
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The value of the
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.Fa pathname
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argument is an empty string;
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or a symbolic link to an empty string is encountered.
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.It Bq Er ENOTDIR
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A component of the path prefix is not a directory.
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.El
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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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