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
                        translating 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)

HISTORY
     An undelete() function call first appeared in 4.4BSD-Lite.

DragonFly 4.3                  October 18, 1994                  DragonFly 4.3