undelete(2) [netbsd man page]

UNDELETE(2)						      BSD System Calls Manual						       UNDELETE(2)

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.

BSD
								 November 28, 2008							       BSD

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)