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UNDELETE(2)		       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 ob-
     jects in a lower layer of the union stack to become visible once more.

     Eventually, the undelete() functionality may be expanded to other file sys-
     tems 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  translating
			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 en-
			try.

     [EINTEGRITY]	Corrupted data was detected while reading from the  file
			system.

     [EROFS]		The name resides on a read-only file system.

     [EFAULT]		The path argument points outside the process's allocated
			address space.

SEE ALSO
     unlink(2), mount_unionfs(8)

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

FreeBSD ports 15.quarterly	 March 30, 2020 		     UNDELETE(2)

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