Stop root from writing to directory

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LEARN ABOUT ULTRIX

chroot

chroot(2)							System Calls Manual							 chroot(2)

Name
       chroot - change root directory

Syntax
       chroot(dirname)
       char *dirname;

Description
       The  dirname is the address of the pathname of a directory, terminated by a null byte.  The system call causes this directory to become the
       root directory (/).

       For a directory to become the root directory, a process must have execute (search) access to the directory.

       This call is restricted to the superuser.

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.

Diagnostics
       The system call fails and the root directory is unchanged under the following conditions:

       [ENOTDIR]      A component of the dirname is not a directory.

       [ENAMETOOLONG] A component of a dirname exceeded 255 characters, or an entire dirname exceeded 1023 characters.

       [ENOENT]       The dirname argument points to the name of a directory which does not exist, or to  an  empty  string  and  the  environment
		      defined is POSIX or SYSTEM_FIVE.

       [EFAULT]       The dirname points outside the process's allocated address space.

       [ELOOP]	      Too many symbolic links were encountered in translating the pathname.

       [EIO]	      An I/O error occurred while reading from or writing to the file system.

       [ESTALE]       The  file  handle  given	in the argument is invalid.  The file referred to by that file handle no longer exists or has been
		      revoked.

       [ETIMEDOUT]    A connect request or remote file operation failed because the connected party did not properly respond  after  a	period	of
		      time that is dependent on the communications protocol.

       [EPERM]	      The effective user ID is not that of superuser.

See Also
       chdir(2)

																	 chroot(2)

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