chroot man page on 4.4BSD

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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 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
     chdir(2)

HISTORY
     The chroot function call appeared in 4.2BSD.

4.2 Berkeley Distribution	 June 4, 1993	     4.2 Berkeley Distribution
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