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UNDELETE(2)		  FreeBSD 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 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 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 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.

     [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 allo-
			cated address space.

SEE ALSO
     unlink(2),	mount_unionfs(8)

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

FreeBSD	9.3		       January 22, 2006			   FreeBSD 9.3

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | HISTORY

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