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fchroot(2) [opensolaris 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 ENOLINK The path argument points to a remote machine and the link to that machine is no longer active.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 5.11 20 Jan 2003 chroot(2)

Check Out this Related Man Page

chroot(2)							System Calls Manual							 chroot(2)

NAME
chroot - Changes the effective root directory SYNOPSIS
#include <unistd.h> int chroot ( const char *path ); STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: chroot(): XPG4, XPG4-UNIX Refer to the standards(5) reference page for more information about industry standards and associated tags. PARAMETERS
Points to the new effective root directory. If the path parameter refers to a symbolic link, the chroot() function sets the effective root directory to the directory pointed to by the symbolic link. DESCRIPTION
The chroot() function causes the directory named by the path parameter to become the effective root directory. The effective root directory is the starting point when searching for a file's pathname that begins with a / (slash). The current working directory is not affected by the chroot() function. The calling process must have superuser privilege in order to change the effective root directory. The calling process must also have search access to the new effective root directory. The .. (dot-dot) entry in the effective root directory is interpreted to mean the effective root directory itself. Thus, .. (dot-dot) can- not be used to access files outside the subtree rooted at the effective root directory. RETURN VALUES
Upon successful completion, a value of 0 (zero) is returned. If the chroot() function fails, a value of -1 is returned and errno is set to indicate the error. ERRORS
If the chroot() function fails, the effective root directory remains unchanged and errno may be set to one of the following values: Search permission is denied for any component of the pathname. The path parameter points outside the process' allocated address space. An I/O error occurred while reading from or writing to the file system. More than MAXSYMLINKS symbolic links are encountered while resolving path. The length of the path argument exceeds PATH_MAX or a pathname component is longer than NAME_MAX. The path parameter does not exist or points to an empty string. A component of path is not a directory. The process does not have appropriate privilege. RELATED INFORMATION
Functions: chdir(2) Commands: cd(1) Standards: standards(5) delim off chroot(2)

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