chroot: změnit kořenový adresář

Originální popis anglicky: chroot - change root directory

Návod, kniha: Linux Programmer's Manual

STRUČNĚ

#include <unistd.h> int chroot(const char *path);

POPIS / INSTRUKCE

chroot changes the root directory to that specified in path. This directory will be used for path names beginning with /. The root directory is inherited by all children of the current process. Only a privileged process (Linux: one with the CAP_SYS_CHROOT capability) may call chroot(2). This call changes an ingredient in the pathname resolution process and does nothing else. This call does not change the current working directory, so that after the call `.' can be outside the tree rooted at `/'. In particular, the super-user can escape from a `chroot jail' by doing `mkdir foo; chroot foo; cd ..'. This call does not close open file descriptors, and such file descriptors may allow access to files outside the chroot tree.

NÁVRATOVÁ HODNOTA

On success, zero is returned. On error, -1 is returned, and errno is set appropriately.

CHYBY / ERRORY

Depending on the file system, other errors can be returned. The more general errors are listed below:

EACCES

Search permission is denied on a component of the path prefix. (See also path_resolution(2).)

EFAULT

path points outside your accessible address space.

EIO

An I/O error occurred.

ELOOP

Too many symbolic links were encountered in resolving path.

ENAMETOOLONG

path is too long.

ENOENT

The file does not exist.

ENOMEM

Insufficient kernel memory was available.

ENOTDIR

A component of path is not a directory.

EPERM

The caller has insufficient privilege.

ODPOVÍDAJÍCÍ

SVr4, SVID, 4.4BSD, X/OPEN. This function is not part of POSIX.1. SVr4 documents additional EINTR, ENOLINK and EMULTIHOP error conditions. X/OPEN does not document EIO, ENOMEM or EFAULT error conditions. This interface is marked as legacy by X/OPEN.

NOTES

FreeBSD has a stronger jail() system call.

SOUVISEJÍCÍ

chdir(2), path_resolution(2)