GNU/Linux man pages
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GNU/Linux |
CentOS 4.8 |
i386 |
 |
chroot(2) |
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chroot − change root directory
#include <unistd.h>
int chroot(const char *path);
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 the super-user may change the root directory.
Note that this call does not change the current working directory, so that ’.’ 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 ..’.
On success, zero is returned. On error, −1 is returned, and errno is set appropriately.
Depending on the file system, other errors can be returned. The more general errors are listed below:
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EPERM |
The effective UID is not zero. |
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EFAULT |
path points outside your accessible address space. |
ENAMETOOLONG
path is too long.
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ENOENT |
The file does not exist. |
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ENOMEM |
Insufficient kernel memory was available. |
ENOTDIR
A component of path is not a directory.
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EACCES |
Search permission is denied on a component of the path prefix. | ||
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ELOOP |
Too many symbolic links were encountered in resolving path. | ||
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EIO |
An I/O error occurred. |
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.
FreeBSD has a stronger jail() system call.
chdir(2)
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chroot(2) | |