From 81a5adf88569eeddb6ba91ace8e1db58e88ad6ab Mon Sep 17 00:00:00 2001
From: Aleksandar Andrejevic <aandrejevic@reactos.org>
Date: Sat, 9 Nov 2013 18:10:21 +0000
Subject: [PATCH] [NTVDM] Allow COM programs to exit with a simple near return
 to PSP:0000. Spotted by Thomas Faber.

svn path=/branches/ntvdm/; revision=60904
---
 subsystems/ntvdm/dos.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/subsystems/ntvdm/dos.c b/subsystems/ntvdm/dos.c
index df65a78c193..f56ed764d98 100644
--- a/subsystems/ntvdm/dos.c
+++ b/subsystems/ntvdm/dos.c
@@ -1203,6 +1203,12 @@ BOOLEAN DosCreateProcess(LPCSTR CommandLine, WORD EnvBlock)
         /* Set the stack to the last word of the segment */
         EmulatorSetStack(Segment, 0xFFFE);
 
+        /*
+         * Set the value on the stack to 0, so that a near return
+         * jumps to PSP:0000 which has the exit code.
+         */
+        *((LPWORD)SEG_OFF_TO_PTR(Segment, 0xFFFE)) = 0;
+
         /* Execute */
         CurrentPsp = Segment;
         DiskTransferArea = MAKELONG(0x80, Segment);