DragonFly On-Line Manual Pages


UNDELETE(2)		 DragonFly 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() function attempts to recover the deleted file named by path. Currently, this works only when the named object is a whiteout in a union filesystem. 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 filesystems able to recover deleted files such as the log-structured filesystem.

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 indicate 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 translat- ing the pathname. [EPERM] The directory containing the name is marked sticky, and the containing directory is not owned by the effective user ID. [EIO] An I/O error occurred while updating the directory entry. [EROFS] The name resides on a read-only file system. [EFAULT] Path points outside the process's allocated address space.

SEE ALSO

unlink(2), mount_union(8)

HISTORY

An undelete() function call first appeared in 4.4BSD-Lite. DragonFly 4.1 October 18, 1994 DragonFly 4.1