1 files changed, 102 insertions, 0 deletions
diff --git a/src/pal/tests/palsuite/filemapping_memmgt/LockFile/test3/helper.cpp b/src/pal/tests/palsuite/filemapping_memmgt/LockFile/test3/helper.cpp
new file mode 100644
index 0000000000..079417fce8
--- /dev/null
+++ b/src/pal/tests/palsuite/filemapping_memmgt/LockFile/test3/helper.cpp
@@ -0,0 +1,102 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+/*=============================================================
+**
+** Source: helper.c
+**
+** Purpose: A child process which will attempt to read and write to files
+** which were locked in the parent.
+**
+**
+**============================================================*/
+
+#include <palsuite.h>
+
+#define FILENAME "testfile.txt"
+#define BUF_SIZE 128
+
+int __cdecl main(int argc, char *argv[])
+{
+    HANDLE TheFile;
+    int result = 0;
+    char DataBuffer[BUF_SIZE];
+    DWORD BytesRead, BytesWritten;
+    
+    if(0 != (PAL_Initialize(argc, argv)))
+    {
+        return FAIL;
+    }
+    
+    /* Open the same file that the parent has opened and locked */
+    TheFile = CreateFile(FILENAME,     
+                         GENERIC_READ|GENERIC_WRITE, 
+                         FILE_SHARE_READ|FILE_SHARE_WRITE,
+                         NULL,     
+                         OPEN_EXISTING,                 
+                         FILE_ATTRIBUTE_NORMAL, 
+                         NULL);
+    
+    if (TheFile == INVALID_HANDLE_VALUE) 
+    { 
+        Fail("ERROR: Could not open file '%s' with CreateFile.  "
+             "GetLastError() returns %d.",FILENAME,GetLastError()); 
+    }
+    
+    /* Attempt to Read the first 3 bytes from this file.  
+       Since it is unlocked, this should work properly.
+    */
+    
+    if(ReadFile(TheFile, DataBuffer, 3, &BytesRead, NULL) == 0)
+    {
+        Trace("ERROR: ReadFile should have succeeded in reading the first "
+              "three bytes of the file, as these bytes were not locked.  "
+              "GetLastError() returned %d.",GetLastError());
+        result = 1;
+    }
+
+    /* Now, read the next 10 bytes, which should be locked.  Ensure that 
+       ReadFile fails.
+    */
+    
+    if(ReadFile(TheFile, DataBuffer,10, &BytesRead, NULL) != 0)
+    {
+        Trace("ERROR: ReadFile should have failed when attempting to read in "
+              "bytes between StartOfFile+3 and EndOfFile-3.");
+        result = 1;
+    }
+    
+    /* Attempt to Write 10 bytes to this file.  Since it is locked this should
+       fail.
+    */
+    
+    memset(DataBuffer,'X',BUF_SIZE);
+    
+    if(WriteFile(TheFile, DataBuffer, 10,&BytesWritten, NULL) != 0)
+    {
+        Trace("ERROR: WriteFile should have failed when attempting to write "
+              "bytes between StartOfFile+3 and EOF-3.");
+        result = 1;
+    } 
+    
+    
+    /* Move the FilePointer to the EOF-3, where the lock ends */
+    if(SetFilePointer(TheFile,-3,NULL,FILE_END) == INVALID_SET_FILE_POINTER)
+    {
+        Fail("ERROR: Could not set the file pointer to the EOF-3 "
+             "using SetFilePointer.  It returned INVALID_SET_FILE_POINTER.");
+    }
+    
+    /* Attempt to write to those 3 unlocked bytes on the end of the file */
+    if(WriteFile(TheFile, DataBuffer, 3,&BytesWritten, NULL) == 0)
+    {
+        Trace("ERROR: WriteFile should have succeeded when attempting "
+              "to write the last three bytes of the file, as they were not "
+              "locked.  GetLastError() returned %d.",GetLastError());
+        result = 1;
+    } 
+    
+    PAL_TerminateEx(result);
+    return result;
+}