chroot man page on SmartOS

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CHROOT(2)							     CHROOT(2)

       chroot, fchroot - change root directory

       #include <unistd.h>

       int chroot(const char *path);

       int fchroot(int fildes);

       The  chroot()  and  fchroot() functions cause a directory to become the
       root directory, the starting point for path  searches  for  path	 names
       beginning with / (slash). The user's working directory is unaffected by
       the chroot() and fchroot() functions.

       The path argument points to a path name naming a directory. The	fildes
       argument	 to  fchroot()	is  the	 open file descriptor of the directory
       which is to become the root.

       The privilege {PRIV_PROC_CHROOT} must be asserted in the effective  set
       of  the process to change the root directory. While it is always possi‐
       ble to change to the system root using the fchroot()  function,	it  is
       not guaranteed to succeed in any other case, even if fildes is valid in
       all respects.

       The ".." entry in the root directory is interpreted to  mean  the  root
       directory  itself.  Therefore, ".." cannot be used to access files out‐
       side the subtree rooted at the root directory. Instead,	fchroot()  can
       be  used	 to  reset  the root to a directory that was opened before the
       root directory was changed.

       Upon successful completion, 0 is returned. Otherwise, −1	 is  returned,
       the  root directory remains unchanged, and errno is set to indicate the

       The chroot() function will fail if:

		       Search permission is denied for a component of the path
		       prefix  of  dirname, or search permission is denied for
		       the directory referred to by dirname.

		       The descriptor is not valid.

		       The path argument points to an illegal address.

		       The fchroot() function attempted to change to a	direc‐
		       tory  the  is  not the system root and external circum‐
		       stances do not allow this.

		       A  signal  was  caught  during  the  execution  of  the
		       chroot() function.

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

		       Too many symbolic links were encountered in translating

		       The  length  of	the path argument exceeds PATH_MAX, or
		       the length of a path component exceeds  NAME_MAX	 while
		       _POSIX_NO_TRUNC is in effect.

		       The  named  directory does not exist or is a null path‐

		       The path argument points to a remote  machine  and  the
		       link to that machine is no longer active.

		       Any component of the path name is not a directory.

		       The {PRIV_PROC_CHROOT} privilege is not asserted in the
		       effective set of the calling process.

       chroot(1M), chdir(2), privileges(5)

       The only use of fchroot() that is appropriate is to change back to  the
       system root.

				 Jan 20, 2003			     CHROOT(2)

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