Manual browser: undelete(2)

UNDELETE(2) System Calls Manual UNDELETE(2)


undeleteremove whiteout


Standard C Library (libc, -lc)


#include <unistd.h>

undelete(const char *path);


Currently undelete 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.


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:
Search permission is denied for a component of the path prefix, or write permission is denied on the directory containing the name to be undeleted.
The path does not reference a whiteout.
path points outside the process's allocated address space.
The pathname contains a character with the high-order bit set.
An I/O error occurred while updating the directory entry.
Too many symbolic links were encountered in translating the pathname.
A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 characters.
The named whiteout does not exist.
A component of the path prefix is not a directory.
The directory containing the name is marked sticky, and the containing directory is not owned by the effective user ID.
The name resides on a read-only file system.


An undelete function call first appeared in 4.4BSD--Lite.
November 28, 2008 NetBSD 7.0