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CHROOT(2)		   Linux Programmer's Manual		     CHROOT(2)

NAME
       chroot -	change root directory

SYNOPSIS
       #include	<unistd.h>

       int chroot(const	char *path);

   Feature Test	Macro Requirements for glibc (see feature_test_macros(7)):

       chroot():
	   Since glibc 2.2.2:
	       _BSD_SOURCE ||
		   (_XOPEN_SOURCE >= 500 ||
		       _XOPEN_SOURCE &&	_XOPEN_SOURCE_EXTENDED)	&&
		   !(_POSIX_C_SOURCE >=	200112L	|| _XOPEN_SOURCE >= 600)
	   Before glibc	2.2.2: none

DESCRIPTION
       chroot()	 changes  the  root  directory	of the calling process to that
       specified in path.  This	directory will be used for pathnames beginning
       with /.	The root directory is inherited	by all children	of the calling
       process.

       Only a privileged process (Linux: one with the CAP_SYS_CHROOT  capabil-
       ity) may	call chroot().

       This  call changes an ingredient	in the pathname	resolution process and
       does nothing else.

       This call does not change the current working directory,	so that	 after
       the call	'.' can	be outside the tree rooted at '/'.  In particular, the
       superuser can escape from a "chroot jail" by doing:

	   mkdir foo; chroot foo; cd ..

       This call does not close	open file descriptors, and such	file  descrip-
       tors may	allow access to	files outside the chroot tree.

RETURN VALUE
       On  success,  zero is returned.	On error, -1 is	returned, and errno is
       set appropriately.

ERRORS
       Depending on the	filesystem, other errors can be	 returned.   The  more
       general errors are listed below:

       EACCES Search  permission  is denied on a component of the path prefix.
	      (See also	path_resolution(7).)

       EFAULT path points outside your accessible address space.

       EIO    An I/O error occurred.

       ELOOP  Too many symbolic	links were encountered in resolving path.

       ENAMETOOLONG
	      path is too long.

       ENOENT The file does not	exist.

       ENOMEM Insufficient kernel memory was available.

       ENOTDIR
	      A	component of path is not a directory.

       EPERM  The caller has insufficient privilege.

CONFORMING TO
       SVr4, 4.4BSD, SUSv2 (marked LEGACY).  This  function  is	 not  part  of
       POSIX.1-2001.

NOTES
       A  child	 process created via fork(2) inherits its parent's root	direc-
       tory.  The root directory is left unchanged by execve(2).

       FreeBSD has a stronger jail() system call.

SEE ALSO
       chdir(2), path_resolution(7)

COLOPHON
       This page is part of release 3.74 of the	Linux  man-pages  project.   A
       description  of	the project, information about reporting bugs, and the
       latest	 version    of	  this	  page,	   can	   be	  found	    at
       http://www.kernel.org/doc/man-pages/.

Linux				  2010-09-20			     CHROOT(2)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON

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