fchroot(2)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SUMMARY OF TRUSTED SOLARIS CHANGES | SEE ALSO | WARNINGS

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 calling process must assert the PRIV_PROC_CHROOT privilege to use this system call. While it is always possible to change to the system root using the fchroot() function, it is not guaranteed to succeed in any other case, even should fildes be 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 outside 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

chroot() returns:

0

On success.

-1

On failure, and sets errno 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.To override these restrictions, the calling process may assert one or both of these privileges: PRIV_FILE_DAC_SEARCH and PRIV_FILE_MAC_SEARCH.

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 that 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The path argument points to a remote machine and the link to that machine is no longer active.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 calling process must assert the PRIV_PROC_CHROOT privilege to change the root directory.

SUMMARY OF TRUSTED SOLARIS CHANGES

Appropriate privilege is required to override access checks.

The calling process must assert the PRIV_PROC_CHROOT privilege to change the root directory.

SEE ALSO

Trusted Solaris 8 HW 12/02 Reference Manual

chroot(1M)

WARNINGS

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

Trusted Solaris 8 HW 12/02  Last Revised 30 Sep 1999

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SUMMARY OF TRUSTED SOLARIS CHANGES | SEE ALSO | WARNINGS