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 beginning with
‘/’.
In order for a directory to become the root directory a process must have execute (search) access for that directory.
It should be noted that
chroot() has
no effect on the process's current 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.
- [
EINVAL] - The pathname contains a character with the high-order bit set.
- [
ENAMETOOLONG] - A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 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
HISTORY
The chroot function call appeared in
4.2BSD.