From c6fafbbb2d4318d292d0119b560cdefa2c00822f Mon Sep 17 00:00:00 2001
From: Kenneth J Davis <PerditionC@gmail.com>
Date: Thu, 22 Jul 2021 22:31:45 -0400
Subject: [PATCH] int 21h/4400h only return low byte of SFT flags if not a
 device, part of dosemu2/fdpp bug #147 fix -
 https://github.com/dosemu2/fdpp/commit/b2b55fc1af2b7e65cf98c2c393565cc2f8418ee0

---
 kernel/ioctl.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/ioctl.c b/kernel/ioctl.c
index 9ea4d7a..c17ff0b 100644
--- a/kernel/ioctl.c
+++ b/kernel/ioctl.c
@@ -114,10 +114,10 @@ int DosDevIOctl(lregs * r)
       {
         case 0x00:
           /* Get the flags from the SFT                           */
+          r->AX = flags & 0xff;
           if (flags & SFT_FDEVICE)
-            r->AX = (flags & 0xff) | (s->sft_dev->dh_attr & 0xff00);
-          else
-            r->AX = flags;
+            r->AX |= (s->sft_dev->dh_attr & 0xff00);
+          /* else: files/networks return 0 in AH/DH */
           /* Undocumented result, Ax = Dx seen using Pcwatch */
           r->DX = r->AX;
           return SUCCESS;