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Bug report -- MySQL v4.04b, source distribution
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Machine specs (build machine and test machine are same machine):
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Dell Inspiron 8200 laptop
Windows XP Professional SP1
.NET Framework SP2
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Build description:
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libmysqld.dll was built using Microsoft Visual C++ 6.0 SP5 and Microsoft
Visual C++ Processor Pack SP5 (used for ASM files). We build our own
version because we need to make a change so that the DLL will work with
C# clients (see below for more info).
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Problem description:
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A C# client was built using Microsoft Visual Studio.NET. The client
calls mysql_server_init(), mysql_server_end(), and mysql_server_init()
again. On second call to mysql_server_init(), the exception
System.NullReferenceException is thrown.
>From an equivalent C++ program, an access violation occurs at the same
point.
Behavior is identical using debug and release builds of libmysqld.dll.
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C# code:
--------
using System;
using System.Runtime.InteropServices;
using System.Security;
namespace Reproduce_Embedded_MySQL_crash
{
class Class1
{
[STAThread]
static void Main(string[] args)
{
MySqlAPI.ServerInit(0, null, null);
MySqlAPI.ServerEnd();
MySqlAPI.ServerInit(0, null, null);
MySqlAPI.ServerEnd();
}
}
class MySqlAPI
{
[SuppressUnmanagedCodeSecurity]
[DllImport("libmysqld.dll",
CharSet=System.Runtime.InteropServices.CharSet.Ansi,
EntryPoint="mysql_server_init", ExactSpelling=true)]
public static extern int ServerInit(int icArgs, string [] strArgs,
string [] strGroups);
[DllImport("libmysqld.dll",
EntryPoint="mysql_server_end", ExactSpelling=true)]
public static extern void ServerEnd();
}
}
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C++ code:
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/****************************************************/
/* modified from test_dll.cpp that ships with MySQL */
/****************************************************/
#include "stdafx.h"
#include <winsock.h>
#include <mysql.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
const char *server_groups[] = {
"test_libmysqld_SERVER", "embedded", "server", NULL
};
int main(int argc, char* argv[])
{
mysql_server_init(argc, argv, (char **)server_groups);
mysql_server_end();
mysql_server_init(argc, argv, (char **)server_groups);
mysql_server_end();
return 0;
}
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MySQL binaries:
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Upon request, I can supply our debug and release builds of
libmysqld.dll.
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Source code change description:
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There is only one change we make to the MySQL 4.04b source distribution.
We define USE_TLS for the "mysys" project. The reason is that it's
required for clients that use LoadLibrary(), which includes all C#
clients. More information can be found in the VC++ documentation
article "Rules and Limitations for TLS".
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My contact information:
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Matt Solnit <[EMAIL PROTECTED]>
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