undelete man page on 4.4BSD

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

     undelete — attempt to recover a deleted file

     #include <unistd.h>

     undelete(const char *path);

     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 filesys‐
     tems able to recover deleted files such as the log-structured filesystem.

     Upon successful completion, a value of 0 is returned.  Otherwise, a value
     of -1 is returned and errno is set to indicate the error.

     The undelete() succeeds unless:

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

     [EINVAL]	     The pathname contains a character with the high-order bit

     [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

     [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

     unlink(2), mount_union(8)

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

4th Berkeley Distribution      October 18, 1994	     4th Berkeley Distribution

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