Brendan Shanks : kernelbase: Implement DiscardVirtualMemory().

[Alexandre Julliard]

Module: wine
Branch: master
Commit: d7d94ed0df6931907d1c89d7d7551dd40f5214c5
URL:    https://gitlab.winehq.org/wine/wine/-/commit/d7d94ed0df6931907d1c89d7d7551dd...

Author: Brendan Shanks 
Date:   Fri Mar  3 10:49:18 2023 -0800

kernelbase: Implement DiscardVirtualMemory().

---

dlls/kernel32/kernel32.spec     |  1 +
 dlls/kernelbase/kernelbase.spec |  2 +-
 dlls/kernelbase/memory.c        | 13 +++++++++++++
 include/memoryapi.h             |  1 +
 4 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/dlls/kernel32/kernel32.spec b/dlls/kernel32/kernel32.spec
index 47ff251067a..8da6321e8d0 100644
--- a/dlls/kernel32/kernel32.spec
+++ b/dlls/kernel32/kernel32.spec
@@ -371,6 +371,7 @@
 @ stdcall -import DeleteProcThreadAttributeList(ptr)
 # @ stub DisableThreadProfiling
 @ stdcall DisassociateCurrentThreadFromCallback(ptr) NTDLL.TpDisassociateCallback
+@ stdcall DiscardVirtualMemory(ptr long) kernelbase.DiscardVirtualMemory
 @ stdcall DeleteTimerQueue(long)
 @ stdcall -import DeleteTimerQueueEx(long long)
 @ stdcall -import DeleteTimerQueueTimer(long long long)
diff --git a/dlls/kernelbase/kernelbase.spec b/dlls/kernelbase/kernelbase.spec
index e3a0ad257f2..af3af8ecabe 100644
--- a/dlls/kernelbase/kernelbase.spec
+++ b/dlls/kernelbase/kernelbase.spec
@@ -269,7 +269,7 @@
 @ stdcall DisablePredefinedHandleTableInternal(long)
 @ stdcall DisableThreadLibraryCalls(long)
 @ stdcall DisassociateCurrentThreadFromCallback(ptr) ntdll.TpDisassociateCallback
-# @ stub DiscardVirtualMemory
+@ stdcall DiscardVirtualMemory(ptr long)
 @ stdcall DisconnectNamedPipe(long)
 @ stdcall DnsHostnameToComputerNameExW(wstr ptr ptr)
 # @ stub DsBindWithSpnExW
diff --git a/dlls/kernelbase/memory.c b/dlls/kernelbase/memory.c
index 4bcd4a639f6..a3ba79f3405 100644
--- a/dlls/kernelbase/memory.c
+++ b/dlls/kernelbase/memory.c
@@ -52,6 +52,19 @@ BOOLEAN WINAPI RtlSetUserValueHeap( HANDLE handle, ULONG flags, void *ptr, void
  ***********************************************************************/

+/***********************************************************************
+ *             DiscardVirtualMemory   (kernelbase.@)
+ */
+DWORD WINAPI DECLSPEC_HOTPATCH DiscardVirtualMemory( void *addr, SIZE_T size )
+{
+    NTSTATUS status;
+    LPVOID ret = addr;
+
+    status = NtAllocateVirtualMemory( GetCurrentProcess(), &ret, 0, &size, MEM_RESET, PAGE_NOACCESS );
+    return RtlNtStatusToDosError( status );
+}
+
+
 /***********************************************************************
  *             FlushViewOfFile   (kernelbase.@)
  */
diff --git a/include/memoryapi.h b/include/memoryapi.h
index 8743e67927c..6728b832fa7 100644
--- a/include/memoryapi.h
+++ b/include/memoryapi.h
@@ -41,5 +41,6 @@ typedef struct WIN32_MEMORY_REGION_INFORMATION
     SIZE_T CommitSize;
 } WIN32_MEMORY_REGION_INFORMATION;

+DWORD WINAPI DiscardVirtualMemory(void *addr, SIZE_T size);
 BOOL WINAPI QueryVirtualMemoryInformation(HANDLE process,const void *addr,
         WIN32_MEMORY_INFORMATION_CLASS info_class, void *info, SIZE_T size, SIZE_T *ret_size);