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.TH @PACKAGE@_fso_is_changeable 3 "2008-04-18" "version @PACKAGE_VERSION@" Subversion
.SH NAME
@PACKAGE@_fso_is_changeable \- test if a file or directory is
changeable
.SH SYNOPSIS
.B #include <@PACKAGE@/fso_is_changeable.h>

.BI "int @PACKAGE@_fso_is_changeable(const char* " path ");"
.SH DESCRIPTION
Tests if the file or directory referred to by
.I path
is changeable.  A file or directory is considered changeable if it can
be directly modified or if any component of the path can be renamed.
If any component of the path refers to a symbolic link, the target is
also tested.  Permissions are tested against the real user and group
IDs, not the effective IDs.

This function is designed to help determine whether a file is safe to
.BR exec (3)
from a setuid/setgid binary.  If this function returns true, the user
may be able to start a shell as the effective user.

This function is thread-safe if the user's C POSIX library is
thread-safe.
.SH ARGUMENTS
.TP
.I path
Null-terminated string containing the path to the file or directory to
test.
.SH RETURN VALUE
On success, returns 1 if the user (real user and group IDs) can change
the file or directory referred to by
.IR path ,
or 0 if the file or directory can not be changed.

On error, returns 1 and sets
.I errno
(see
.BR errno (3)).
.SH ERRORS
Error conditions and
.I errno
(see
.BR errno (3))
values are described in the specifications for
.BR stat "(3), " access "(3), " snprintf "(3), " lstat "(3), " readlink "(3), and " getcwd "(3)."
.SH SEE ALSO
.BR lib@PACKAGE@ "(3), " @PACKAGE@_exec_svnserve "(3)"
.SH AUTHOR
Richard Hansen <svnstsw@ir.bbn.com>
.SH COPYING
Copyright (c) 2008 BBN Technologies Corp.  All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
.RS 0
.IP 1. 4
Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
.IP 2. 4
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.
.IP 3. 4
Neither the name of BBN Technologies nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
.RE

THIS SOFTWARE IS PROVIDED BY BBN TECHNOLOGIES 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 BBN TECHNOLOGIES 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.