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Date: Wed, 29 Jun 2016 17:14:46 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Cygwin IPC - ftok() returns negative values - Bug Report
Message-ID: <20160629151446.GO981@calimero.vinschen.de>
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On Jun 29 13:14, Stanis=C5=82aw Wawszczak wrote:
> Dear All,
> =C2=A0
> I have had to compile sblim-sfcbd-1.4.10 on Cygwin. It is using IPC semap=
hores.
> Unfortunately it is returning wrong value as the result of complicated bi=
t-wise logical operations.
> I have tried to =E2=80=9Chack the system=E2=80=9D and make multiplication=
 of returned value by -1, but it triggers error in semget()
> Environment:
> Windows 2012 R2 with latest patches
> I have installed Cygwin from official installer couple days ago.
> =C2=A0
> I have attached the gdb session from such invocation. You can see the pat=
h and id in arguments are correct and stat() function returns correct value=
s.
> Finally result in %rax is negative:
> rax=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0xa=
f0b000701cc1d53=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 -5833568862233420461

Ok,  but what's the exact problem?  Following a GDB session is kind
of a lot of work.  Simple, very short, self-contained testcase, perhaps?


Corinna

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

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