.\" Copyright (c) 1983, 1991, 1993.\"	The Regents of the University of California.  All rights reserved..\".\" Redistribution and use in source and binary forms, with or without.\" modification, are permitted provided that the following conditions.\" are met:.\" 1. Redistributions of source code must retain the above copyright.\"    notice, this list of conditions and the following disclaimer..\" 2. 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..\" 3. All advertising materials mentioning features or use of this software.\"    must display the following acknowledgement:.\"	This product includes software developed by the University of.\"	California, Berkeley and its contributors..\" 4. Neither the name of the University nor the names of its contributors.\"    may be used to endorse or promote products derived from this software.\"    without specific prior written permission..\".\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 THE REGENTS 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..\".\"     @(#)chroot.2	8.1 (Berkeley) 6/4/93.\".Dd June 4, 1993.Dt CHROOT 2.Os BSD 4.2.Sh NAME.Nm chroot.Nd change root directory.Sh SYNOPSIS.Fd #include <unistd.h>.Ft int.Fn chroot "const char *dirname".Sh DESCRIPTION.Fa Dirnameis the address of the pathname of a directory, terminated by an ASCII NUL..Fn Chrootcauses.Fa dirnameto become the root directory,that is, the starting point for path searches of pathnamesbeginning with.Ql / ..PpIn order for a directory to become the root directorya process must have execute (search) access for that directory..PpIt should be noted that.Fn chroothas no effect on the process's current directory..PpThis call is restricted to the super-user..Sh RETURN VALUESUpon successful completion, a value of 0 is returned.  Otherwise,a value of -1 is returned and.Va errnois set to indicate an error..Sh ERRORS.Fn Chrootwill fail and the root directory will be unchanged if:.Bl -tag -width [ENOTDIR].It Bq Er ENOTDIRA component of the path name is not a directory..It Bq Er EINVALThe pathname contains a character with the high-order bit set..It Bq Er ENAMETOOLONGA component of a pathname exceeded 255 characters,or an entire path name exceeded 1023 characters..It Bq Er ENOENTThe named directory does not exist..It Bq Er EACCESSearch permission is denied for any component of the path name..It Bq Er ELOOPToo many symbolic links were encountered in translating the pathname..It Bq Er EFAULT.Fa Pathpoints outside the process's allocated address space..It Bq Er EIOAn I/O error occurred while reading from or writing to the file system..El.Sh SEE ALSO.Xr chdir 2.Sh HISTORYThe.Nmfunction call appeared in.Bx 4.2 .