Mac Developer Library Developer


This manual page is part of Xcode Tools version 5.0

To obtain these tools:

If you are running a version of Xcode Tools other than 5.0, view the documentation locally:

  • In Xcode

  • In Terminal, using the man(1) command

Reading manual pages

Manual pages are intended as a quick reference for people who already understand a technology.

  • To learn how the manual is organized or to learn about command syntax, read the manual page for manpages(5).

  • For more information about this technology, look for other documentation in the Apple Developer Library.

  • For general information about writing shell scripts, read Shell Scripting Primer.

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

     undelete -- attempt to recover a deleted file

     Standard C Library (libc, -lc)

     #include <unistd.h>

     undelete(const char *path);

     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.

     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.

     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 entry.

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

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


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

BSD                            January 22, 2006                            BSD

Reporting Problems

The way to report a problem with this manual page depends on the type of problem:

Content errors
Report errors in the content of this documentation with the feedback links below.
Bug reports
Report bugs in the functionality of the described tool or API through Bug Reporter.
Formatting problems
Report formatting mistakes in the online version of these pages with the feedback links below.