Linux 2.6 - man page for chroot (linux section 2)
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CHROOT(2) Linux Programmer's Manual CHROOT(2)
chroot - change root directory
int chroot(const char *path);
Feature Test Macro Requirements for glibc (see feature_test_macros(7) ):
Since glibc 2.2.2:
(_XOPEN_SOURCE >= 500 ||
_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED) &&
!(_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600)
Before glibc 2.2.2: none
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 inher-
ited by all children of the calling process.
Only a privileged process (Linux: one with the CAP_SYS_CHROOT capability) may call
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.
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
Depending on the filesystem, other errors can be returned. The more general errors are
EACCES Search permission is denied on a component of the path prefix. (See also path_res-
EFAULT path points outside your accessible address space.
EIO An I/O error occurred.
ELOOP Too many symbolic links were encountered in resolving path.
path is too long.
ENOENT The file does not exist.
ENOMEM Insufficient kernel memory was available.
A component of path is not a directory.
EPERM The caller has insufficient privilege.
SVr4, 4.4BSD, SUSv2 (marked LEGACY). This function is not part of POSIX.1-2001.
A child process created via fork(2) inherits its parent's root directory. The root direc-
tory is left unchanged by execve(2) .
FreeBSD has a stronger jail() system call.
chdir(2) , path_resolution(7)
This page is part of release 3.55 of the Linux man-pages project. A description of the
project, and information about reporting bugs, can be found at
Linux 2010-09-20 CHROOT(2)
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