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UNDELETE(2)		 DragonFly System Calls Manual		   UNDELETE(2)


undelete -- attempt to recover a deleted file


Standard C Library (libc, -lc)


#include <unistd.h> int undelete(const char *path);


The undelete() function attempts to recover the deleted file named by path. Currently, this 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. Eventually, the undelete() functionality may be expanded to other filesystems able to recover deleted files such as the log-structured filesystem.


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 translat- ing the pathname. [EPERM] The directory containing the name is marked sticky, and the containing directory is not owned by the effective user ID. [EIO] An I/O error occurred while updating the directory entry. [EROFS] The name resides on a read-only file system. [EFAULT] Path points outside the process's allocated address space.




An undelete() function call first appeared in 4.4BSD-Lite. DragonFly 4.9 October 18, 1994 DragonFly 4.9

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