NAME

undelete — remove whiteout

LIBRARY

Standard C Library (libc, -lc)

SYNOPSIS

#include <unistd.h>

int
undelete(const char *path);

DESCRIPTION

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.

RETURN VALUES

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 undelete() succeeds unless:

[EACCES]

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.

[EEXIST]

The path does not reference a whiteout.

[EFAULT]

path points outside the process's allocated address space.

[EINVAL]

The pathname contains a character with the high-order bit set.

[EIO]

An I/O error occurred while updating the directory entry.

[ELOOP]

Too many symbolic links were encountered in translating the pathname.

[ENAMETOOLONG]

A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 characters.

[ENOENT]

The named whiteout does not exist.

[ENOTDIR]

A component of the path prefix is not a directory.

[EPERM]

The directory containing the name is marked sticky, and the containing directory is not owned by the effective user ID.

[EROFS]

The name resides on a read-only file system.

SEE ALSO

unlink(2), mount_union(8)

HISTORY

An undelete function call first appeared in 4.4BSD--Lite.