man undelete (2): attempt to recover a deleted file

LIBRARY

Lb libc

SYNOPSIS

In unistd.h Ft int Fn undelete const char *path

DESCRIPTION

The Fn undelete system call attempts to recover the deleted file named by Fa path . Currently, this works only when the named object is a whiteout 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 Fn undelete functionality may be expanded to other file systems able to recover deleted files such as the log-structured file system.

RETURN VALUES

Rv -std undelete

ERRORS

The Fn undelete succeeds unless:

Bq Er ENOTDIR: A component of the path prefix is not a directory.
Bq Er ENAMETOOLONG: A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 characters.
Bq Er EEXIST: The path does not reference a whiteout.
Bq Er ENOENT: The named whiteout does not exist.
Bq Er EACCES: Search permission is denied for a component of the path prefix.
Bq Er EACCES: Write permission is denied on the directory containing the name to be undeleted.
Bq Er ELOOP: Too many symbolic links were encountered in translating the pathname.
Bq Er EPERM: The directory containing the name is marked sticky, and the containing directory is not owned by the effective user ID.
Bq Er EINVAL: The last component of the path is `..'
Bq Er EIO: An I/O error occurred while updating the directory entry.
Bq Er EROFS: The name resides on a read-only file system.
Bq Er EFAULT: The Fa path argument points outside the process's allocated address space.

HISTORY

The Fn undelete system call first appeared in BSD 4.4 Lite