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CHROOT(2) BSD System Calls Manual CHROOT(2)
NAME
chroot -- change root directory
SYNOPSIS
#include <unistd.h>
int
chroot(const char *dirname);
DESCRIPTION
Dirname is the address of the pathname of a directory, terminated by an ASCII NUL. Chroot() causes
dirname to become the root directory, that is, the starting point for path searches of pathnames begin-ning beginning
ning with `/'.
In order for a directory to become the root directory a process must have execute (search) access for
that directory.
If the program is not currently running with an altered root directory, it should be noted that
chroot() has no effect on the process's current directory.
If the program is already running with an altered root directory, the process's current directory is
changed to the same new root directory. This prevents the current directory from being further up the
directory tree than the altered root directory.
This call is restricted to the super-user.
RETURN VALUES
Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and errno
is set to indicate an error.
ERRORS
Chroot() will fail and the root directory will be unchanged if:
[ENOTDIR] A component of the path name is not a directory.
[ENAMETOOLONG] A component of a pathname exceeded {NAME_MAX} characters, or an entire path name
exceeded {PATH_MAX} characters.
[ENOENT] The named directory does not exist.
[EACCES] Search permission is denied for any component of the path name.
[ELOOP] Too many symbolic links were encountered in translating the pathname.
[EFAULT] Path points outside the process's allocated address space.
[EIO] An I/O error occurred while reading from or writing to the file system.
SEE ALSO
chdir(2)
WARNINGS
There are ways for a root process to escape from the chroot jail.
HISTORY
The chroot() function call appeared in 4.2BSD.
4.2 Berkeley Distribution June 4, 1993 4.2 Berkeley Distribution
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