undelete(2) - NetBSD Manual Pages

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UNDELETE(2)               NetBSD System Calls Manual               UNDELETE(2)

undelete -- remove whiteout
Standard C Library (libc, -lc)
#include <unistd.h> int 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: [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.
unlink(2), mount_union(8)
An undelete function call first appeared in 4.4BSD -Lite. NetBSD 6.0 November 28, 2008 NetBSD 6.0
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