NAME

chroot − change root directory

SYNOPSIS

int chroot (path)
char ∗path;

DESCRIPTION

path points to a path name naming a directory.  chroot causes the named directory to become the root directory, the starting point for path searches for path names beginning with /.  The user’s working directory is unaffected by the chroot system call. 

The effective user ID of the process must be super-user to change the root directory. 

The ..  entry in the root directory is interpreted to mean the root directory itself.  Thus, ..  cannot be used to access files outside the subtree rooted at the root directory. 

chroot fails and the root directory is not changed if one or more of the following are true:

­[ENOTDIR] Any component of the path name is not a directory. 

­[ENOENT] The named directory does not exist. 

­[EPERM] The effective user ID is not super-user. 

­[EFAULT] path points outside the allocated address space of the process. 

­[EINTR] A signal was caught during the chroot system call. 

­[ENOLINK] path points to a remote machine and the link to that machine is no longer active. 

­[EMULTIHOP] Components of path require hopping to multiple remote machines. 

SEE ALSO

chdir(2). 

DIAGNOSTICS

Upon successful completion, a value of 0 is returned.  Otherwise, a value of −1 is returned and errno is set to indicate the error. 

September 29, 2021