fdbe55fccb
[ENOENT] A component of file_name does not name an existing file or
file_name points to an empty string.
[ENOTDIR] A component of the path prefix is not a directory, or the
file_name argument contains at least one non- <slash> character
and ends with one or more trailing <slash> characters and the last
pathname component names an existing file that is neither a
directory nor a symbolic link to a directory.
Add checks for the listed conditions, and set errno accordingly.
Update the realpath(3) manpage to mention SUS behaviour. Remove the
requirement to include sys/param.h before stdlib.h.
PR: 128933
MFC after: 3 weeks
136 lines
3.7 KiB
Groff
136 lines
3.7 KiB
Groff
.\" 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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.\" 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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.\" @(#)realpath.3 8.2 (Berkeley) 2/16/94
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.\" $FreeBSD$
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.\"
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.Dd May 11, 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 stdlib.h
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.Ft "char *"
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.Fn realpath "const char *pathname" "char *resolved_path"
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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 pointed to by
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.Fa resolved_path .
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The
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.Fa resolved_path
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argument
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.Em must
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point to a buffer capable of storing at least
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.Dv PATH_MAX
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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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All components 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, and all but the last component must name either directories or
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symlinks pointing to the directories.
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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_path
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on success.
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If the function was supplied
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.Dv NULL
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as
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.Fa resolved_path ,
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and operation did not cause errors, the returned value is
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a null-terminated string in a buffer allocated by a call to
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.Fn malloc 3 .
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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 if
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.Fa resolved_path
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is not
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.Dv NULL ,
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the array that it points to 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 lstat 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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.\" The
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.\" .Fn realpath
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.\" function conforms to
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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 first appeared in
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.Bx 4.4 .
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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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