[ekohl] 61026: [EVENTLOG] LogfInitializeExisting: Do not try to write to a file that has been opened as a backup file. It has been opened read-only.

Author: ekohl
Date: Sun Nov 17 22:30:55 2013
New Revision: 61026

URL: http://svn.reactos.org/svn/reactos?rev=61026&view=rev
Log:
[EVENTLOG]
LogfInitializeExisting: Do not try to write to a file that has been opened as a backup
file. It has been opened read-only.

Modified:
    trunk/reactos/base/services/eventlog/file.c

Modified: trunk/reactos/base/services/eventlog/file.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/base/services/eventlog/fil…
==============================================================================
--- trunk/reactos/base/services/eventlog/file.c	[iso-8859-1] (original)
+++ trunk/reactos/base/services/eventlog/file.c	[iso-8859-1] Sun Nov 17 22:30:55 2013
@@ -82,7 +82,7 @@
 
 
 static NTSTATUS
-LogfInitializeExisting(PLOGFILE LogFile)
+LogfInitializeExisting(PLOGFILE LogFile, BOOL Backup)
 {
     DWORD dwRead;
     DWORD dwRecordsNumber = 0;
@@ -264,27 +264,30 @@
        But for now limit EventLog size to just under 5K. */
     LogFile->Header.MaxSize = 5000;
 
-    if (SetFilePointer(LogFile->hFile, 0, NULL, FILE_BEGIN) ==
-        INVALID_SET_FILE_POINTER)
-    {
-        DPRINT1("SetFilePointer() failed! %d\n", GetLastError());
-        return STATUS_EVENTLOG_FILE_CORRUPT;
-    }
-
-    if (!WriteFile(LogFile->hFile,
-                   &LogFile->Header,
-                   sizeof(EVENTLOGHEADER),
-                   &dwRead,
-                   NULL))
-    {
-        DPRINT1("WriteFile failed! %d\n", GetLastError());
-        return STATUS_EVENTLOG_FILE_CORRUPT;
-    }
-
-    if (!FlushFileBuffers(LogFile->hFile))
-    {
-        DPRINT1("FlushFileBuffers failed! %d\n", GetLastError());
-        return STATUS_EVENTLOG_FILE_CORRUPT;
+    if (!Backup)
+    {
+        if (SetFilePointer(LogFile->hFile, 0, NULL, FILE_BEGIN) ==
+            INVALID_SET_FILE_POINTER)
+        {
+            DPRINT1("SetFilePointer() failed! %d\n", GetLastError());
+            return STATUS_EVENTLOG_FILE_CORRUPT;
+        }
+
+        if (!WriteFile(LogFile->hFile,
+                       &LogFile->Header,
+                       sizeof(EVENTLOGHEADER),
+                       &dwRead,
+                       NULL))
+        {
+            DPRINT1("WriteFile failed! %d\n", GetLastError());
+            return STATUS_EVENTLOG_FILE_CORRUPT;
+        }
+
+        if (!FlushFileBuffers(LogFile->hFile))
+        {
+            DPRINT1("FlushFileBuffers failed! %d\n", GetLastError());
+            return STATUS_EVENTLOG_FILE_CORRUPT;
+        }
     }
 
     return STATUS_SUCCESS;
@@ -380,7 +383,7 @@
     if (bCreateNew)
         Status = LogfInitializeNew(pLogFile);
     else
-        Status = LogfInitializeExisting(pLogFile);
+        Status = LogfInitializeExisting(pLogFile, Backup);
 
     if (!NT_SUCCESS(Status))
         goto fail;