undelete(2) [debian man page]
UNDELETE(2) BSD 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 white- out 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 indi- cate 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 entry. [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. BSD
January 22, 2006 BSD
Check Out this Related Man Page
UNLINK(2) System Calls Manual UNLINK(2) NAME
unlink - remove directory entry SYNOPSIS
unlink(path) char *path; DESCRIPTION
Unlink removes the entry for the file path from its directory. If this entry was the last link to the file, and no process has the file open, then all resources associated with the file are reclaimed. If, however, the file was open in any process, the actual resource recla- mation is delayed until it is closed, even though the directory entry has disappeared. RETURN VALUE
Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and errno is set to indicate the error. ERRORS
The unlink succeeds unless: [ENOTDIR] A component of the path prefix is not a directory. [EINVAL] The pathname contains a character with the high-order bit set. [ENAMETOOLONG] A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 characters. [ENOENT] The named file 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 link to be removed. [ELOOP] Too many symbolic links were encountered in translating the pathname. [EPERM] The named file is a directory and the effective user ID of the process is not the super-user. [EPERM] The directory containing the file is marked sticky, and neither the containing directory nor the file to be removed are owned by the effective user ID. [EBUSY] The entry to be unlinked is the mount point for a mounted file system. [EIO] An I/O error occurred while deleting the directory entry or deallocating the inode. [EROFS] The named file resides on a read-only file system. [EFAULT] Path points outside the process's allocated address space. SEE ALSO
close(2), link(2), rmdir(2) 4th Berkeley Distribution May 22, 1985 UNLINK(2)