1 files changed, 125 insertions, 0 deletions
diff --git a/samples/excep/excep.cpp b/samples/excep/excep.cpp
new file mode 100644
index 0000000..488a489
--- /dev/null
+++ b/samples/excep/excep.cpp
@@ -0,0 +1,125 @@
+//////////////////////////////////////////////////////////////////////////////
+//
+//  First Chance Exception Handling Test Program (excep.cpp of excep.exe)
+//
+//  Microsoft Research Detours Package
+//
+//  Copyright (c) Microsoft Corporation.  All rights reserved.
+//
+//  For more information on exception handling, see "A Crash Course on the
+//  Depths of Win32 Structured Exception Handling," by Matt Pietrek in the
+//  January 1997 issue of Microsoft Systems Journal.
+//
+#include <stdio.h>
+#include <windows.h>
+#include <detours.h>
+#include "firstexc.h"
+
+//////////////////////////////////////////////////////////////////////////////
+//
+static LPVOID   s_pvData = NULL;
+static DWORD    s_dwDataPerm = 0;
+
+static LONG ExceptCatch(LONG nTry, DWORD dwException, LPEXCEPTION_POINTERS pinfo)
+{
+    printf("      ExceptCatch(%ld, %08lx, %08lx)\n", nTry, dwException, (ULONG)pinfo);
+#ifdef INCLUDE_THIS
+    if (nTry == 0) {
+        return EXCEPTION_CONTINUE_EXECUTION;
+    }
+#endif
+    return EXCEPTION_EXECUTE_HANDLER;
+}
+
+static int BadCode(int nTry)
+{
+    printf("    BadCode(Try:%d)\n", nTry);
+    printf("      BadCode -> %ld\n", *(PULONG)s_pvData);
+    ((PULONG)s_pvData)[0] = 0;
+    printf("      BadCode -> %ld\n", *(PULONG)s_pvData);
+    ((PULONG)s_pvData)[-1] = 0;
+    printf("      BadCode -> %ld\n", *(PULONG)s_pvData);
+
+    return 0;
+}
+
+void safe(int nTry)
+{
+    __try {
+        printf("  try(%d)\n", nTry);
+        BadCode(nTry);
+        printf("  good(%d)\n", nTry);
+    } __except(ExceptCatch(nTry,
+                           GetExceptionCode(),
+                           GetExceptionInformation())) {
+        DWORD dwExcept = GetExceptionCode();
+
+        printf("  handler(%d) : %08lx\n", nTry, dwExcept);
+    }
+}
+
+void raw(int nTry)
+{
+    BadCode(nTry);
+}
+
+LONG WINAPI MyVirtualFaultFilter(PEXCEPTION_POINTERS pException)
+{
+    PEXCEPTION_RECORD pExceptRec = pException->ExceptionRecord;
+
+    if (pExceptRec->ExceptionCode == 0xc0000005) {
+        printf("--        Memory access exception.\n");
+        if (pExceptRec->NumberParameters >= 2 &&
+            pExceptRec->ExceptionInformation[1] >= (ULONG)s_pvData &&
+            pExceptRec->ExceptionInformation[1] <= (ULONG)s_pvData + sizeof(ULONG)) {
+
+            VirtualProtect(s_pvData, sizeof(ULONG), PAGE_READWRITE, &s_dwDataPerm);
+            printf("--        Changed permissions.\n");
+            return EXCEPTION_CONTINUE_EXECUTION;
+        }
+    }
+    return EXCEPTION_CONTINUE_SEARCH;
+}
+
+int WINAPI WinMain(HINSTANCE hinst, HINSTANCE hprev, LPSTR lpszCmdLine, int nCmdShow)
+{
+    (void)hinst;
+    (void)hprev;
+    (void)lpszCmdLine;
+    (void)nCmdShow;
+
+    s_pvData = VirtualAlloc(NULL, sizeof(ULONG), MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE);
+    if (s_pvData == NULL) {
+        printf("VirtualAlloc failed: %ld\n", GetLastError());
+        return 0;
+    }
+    *(PULONG)s_pvData = 1;
+
+    VirtualProtect(s_pvData, sizeof(ULONG), PAGE_READONLY, &s_dwDataPerm);
+
+    DetourFirstChanceExceptionFilter(MyVirtualFaultFilter);
+
+    printf("main\n");
+    printf("--------------------------------------------------\n");
+    int nTry = 0;
+    for (; nTry < 1; nTry++) {
+        // safe(nTry);
+    }
+    printf("-- safe ------------------------------------------\n");
+    safe(nTry);
+    VirtualProtect(s_pvData, sizeof(ULONG), PAGE_READWRITE, &s_dwDataPerm);
+    *(PULONG)s_pvData = 1;
+    VirtualProtect(s_pvData, sizeof(ULONG), PAGE_READONLY, &s_dwDataPerm);
+
+    printf("-- raw -------------------------------------------\n");
+    printf("*\n");
+    printf("* NB: The second attempt to write will fail because it isn't handled.\n");
+    printf("*\n");
+    raw(nTry);
+    printf("--------------------------------------------------\n");
+    printf("exit\n");
+
+    return 0;
+}
+//
+///////////////////////////////////////////////////////////////// End of File.