To be able to return free space on larger non local disks, the redirector
needs an extension. Dosemu2 has implemented this function and FDPP
has an almost identical patch to this. If the extension is not
implemented by your chosen redirector, then fallback to the standard
110c function is done for int21/7303.
With this patch up to 2TB (with Dosemu2 reporting in 512 blocks) can be
displayed.
Fixes problem with GCC-ia16 compiled share not allowing open of files.
It seems that the TCC 2.01 compiled version was fortunate in that DS
happened to be correct when the interrupt was called, but this was
not the case for the GCC ia16 compiled version.
It's an analogue of this patch by @stsp for FDPP.
https://github.com/dosemu2/fdpp/commit/5b52510b
Delete and Rename should not be able to remove an open file,
so check share's open file table first. Behaviour is now identical
to MS-DOS 6.22.
Note: Uses a new subfunction of the FreeDOS share multiplex
interrupt int2f/0x10a6 called is_file_open()
A similar patch was applied to FDPP at
https://github.com/dosemu2/fdpp/commit/691721f1
Fixes dosemu2 tests:
test_fat_ds3_share_open_rename_fcb
test_fat_ds3_share_open_rename_ds2
test_fat_ds3_share_open_delete_ds2
test_fat_ds3_share_open_delete_fcb
DOS provides the interrupt 2f/12xx functions for use by
filesystem redirectors in order that they do not need to access
structures and variables using undocumented methods. Interrupt
2f/1217 is a function used by a redirector to get the CDS entry
corresponding to a drive without iterating the CDS array found
via SYSVARS LOL.
FreeDOS currently validates the flags in CDS entry before
deciding whether to return the entry to the caller. This behaviour
prevents a redirector receiving the CDS entry corresponding to
an as yet unassigned drive so preventing any new drive mapping.
I've tested the following flavours of DOS and only FreeDOS
does this.
# DOS variants returning new CDS entries okay
DR-DOS
6.00-930319 7.00 7.01 7.02-971119 7.02-980123 7.03 8.00
MS-DOS
3.10 3.20 3.21 3.30-Nec 3.30 3.31 4.01 5.00 6.00 6.20 6.21 6.22
7.00 7.10
PC-DOS
3.00-Compaq 3.00 3.10-850307 3.10-850422 3.10-Compaq 3.20-851230
3.20-860221 3.30 3.31-Compaq 4.00 4.01 5.00 5.02 6.10 6.30 7.00
7.10 7.2K
# DOS variants that return error rather than new CDS entry
FR-DOS
1.00 1.10 1.20
This patch introduces an unvalidated version of get_cds() and calls
it only for the int2f/1217h call, other uses remain as before.
