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// 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;
}
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