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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);

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 direc-
       tory is inherited by all children of the calling process.

       Only  a privileged process (Linux: one with the CAP_SYS_CHROOT capability) 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 descriptors 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 appropri-
       ately.

ERRORS
       Depending  on  the  file  system,  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 directory.  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 3.22 of the Linux man-pages project.  A description of
       the  project, and information about reporting bugs, can be found at http://www.ker-
       nel.org/doc/man-pages/.



Linux                             2008-06-23                         CHROOT(2)

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