Topic       : TOS - The Operating System
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Version     : tos.hyp (December 19, 2008)
Subject     : Programmieren/Atari
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Compiled on : Atari
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View Ref-File11.5.16.33  The directory handle descriptor (DHD)                  TOS

The directory handles are required for Dopendir/Dclosedir/Drewinddir. 
Unlike the file descriptors (FDs) the kernel does not hold a list of 
opened directory handles (DH). When a process terminates, the XFS is 
called via the function xfs_pterm and must release all DHs created for 
the process.

The XFS can obtain the owner of a DH with the kernel pointer act_pd. 
For the kernel a DH looks like the following; these entries have to be 
created by the XFS:

dhd_dmd:  DS.L   1   /* 0x00: Pointer to DMD  */

See also: MagiC's XFS-concept   DMD