fchroot(2) [sunos man page]

chroot(2)							   System Calls 							 chroot(2)

NAME

       chroot, fchroot - change root directory

SYNOPSIS

       #include <unistd.h>

       int chroot(const char *path);

       int fchroot(int fildes);

DESCRIPTION

       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 pos-
       sible 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.

RETURN VALUES

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

ERRORS

       The chroot() function will fail if:

       EACCES		       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.

       EBADF		       The descriptor is not valid.

       EFAULT		       The path argument points to an illegal address.

       EINVAL		       The  fchroot() function attempted to change to a directory the is not the system root and external circumstances do
			       not allow this.

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

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

       ELOOP		       Too many symbolic links were encountered in translating path.

       ENAMETOOLONG	       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.

       ENOENT		       The named directory does not exist or is a null pathname.

       ENOLINK		       The path argument points to a remote machine and the link to that machine is no longer active.

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

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

SEE ALSO

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

WARNINGS

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

SunOS 5.10							    20 Jan 2003 							 chroot(2)