Versioning through undelete

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LEARN ABOUT DEBIAN

undelete

UNDELETE(2)						      BSD System Calls Manual						       UNDELETE(2)

NAME

     undelete -- attempt to recover a deleted file

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <unistd.h>

     int
     undelete(const char *path);

DESCRIPTION

     The undelete() system call attempts to recover the deleted file named by path.  Currently, this works only when the named object is a white-
     out in a union file system.  The system call removes the whiteout causing any objects in a lower layer of the union stack to become visible
     once more.

     Eventually, the undelete() functionality may be expanded to other file systems able to recover deleted files such as the log-structured file
     system.

RETURN VALUES

     The undelete() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indi-
     cate the error.

ERRORS

     The undelete() succeeds unless:

     [ENOTDIR]		A component of the path prefix is not a directory.

     [ENAMETOOLONG]	A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 characters.

     [EEXIST]		The path does not reference a whiteout.

     [ENOENT]		The named whiteout does not exist.

     [EACCES]		Search permission is denied for a component of the path prefix.

     [EACCES]		Write permission is denied on the directory containing the name to be undeleted.

     [ELOOP]		Too many symbolic links were encountered in translating the pathname.

     [EPERM]		The directory containing the name is marked sticky, and the containing directory is not owned by the effective user ID.

     [EINVAL]		The last component of the path is '..'.

     [EIO]		An I/O error occurred while updating the directory entry.

     [EROFS]		The name resides on a read-only file system.

     [EFAULT]		The path argument points outside the process's allocated address space.

SEE ALSO

     unlink(2), mount_unionfs(8)

HISTORY

     The undelete() system call first appeared in 4.4BSD-Lite.

BSD
								 January 22, 2006							       BSD

SCO