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Date:	Thu, 20 Feb 2014 15:57:27 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Bug with dlopen() and fork()
Message-ID:	<20140220145727.GN2246@calimero.vinschen.de>
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On Feb 20 14:16, Jaime Fabregas Fernandez wrote:
> Hello Corinna,
>=20
> As you've checked, this behaviour doesn't appear with dll's created by
> gcc, but it does with Visual Studio C++.
> That minimal example compiled with VS will result in the freeze of the
> child process.
>=20
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D testlib.h =3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> #ifdef TESTLIB_EXPORTS
> #define TEST_API extern "C" __declspec(dllexport)
> #else
> #define TEST_API extern "C" __declspec(dllimport)
> #endif
>=20
> TEST_API  int  mylib_open (const char *foo);
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>=20
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D testlib.cpp =3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> #include "stdafx.h"
> #include "testLib.h"
>=20
>   int
>   mylib_open (const char *foo)
>   {
>     return 1;
>   }
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>=20
> I've tested several compiler and linker options with same result.
>=20
> Any ideas?

Using MS DLLs across fork in this way is unsupported.  If you get it
working, you're just lucky.


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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