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From: =?utf-8?B?U3RhbmlzxYJhdyBXYXdzemN6YWs=?= <stanislaw DOT wawszczak AT iscg DOT pl>
To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject: RE: Cygwin IPC - ftok() returns negative values - Bug Report
Date: Wed, 29 Jun 2016 16:06:30 +0000
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Dear Corinna,

I am sorry about confusing you.
Simply:

----------------------------- Issue ------------------------------------
Call to ftok() returns negative value

----------------------------- Conditions -----------------------------
Windows 2012 R2 with latest patches
Cygwin x64 installed from exe installer got two weeks ago
$ cygcheck -V
cygcheck (cygwin) 2.5.2
System Checker for Cygwin
Copyright (C) 1998 - 2016 Cygwin Authors
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

----------------------------- Test case -------------------------------
#include <sys/ipc.h>
#include <stdio.h>

int main(int argc, char**argv)
{
	key_t semHandle = ftok("/etc/fstab", 'A');
	printf("started\n");
	if(semHandle <= 0)
	{
		printf("semHandle <= 0 ; (semHandle = %lld)\n", semHandle);
	}
	else
	{
		printf("semHandle > 0 ; (semHandle = %lld)\n", semHandle);
	}
	printf("finished\n");
	return 0;
}

--------------------------- Result -----------------------------------
$ ./test.exe
started
semHandle <= 0 ; (semHandle = -5833568887996598975)
finished



Pozdrawiam/Best Regards,

Stanisław Wawszczak
Architekt Systemowy

ISCG Sp. z o.o.
Poland


-----Original Message-----
From: cygwin-owner AT cygwin DOT com [mailto:cygwin-owner AT cygwin DOT com] On Behalf Of Corinna Vinschen
Sent: Wednesday, June 29, 2016 5:15 PM
To: cygwin AT cygwin DOT com
Subject: Re: Cygwin IPC - ftok() returns negative values - Bug Report

On Jun 29 13:14, Stanisław Wawszczak wrote:
> Dear All,
>  
> I have had to compile sblim-sfcbd-1.4.10 on Cygwin. It is using IPC semaphores.
> Unfortunately it is returning wrong value as the result of complicated bit-wise logical operations.
> I have tried to “hack the system” 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.
>  
> I have attached the gdb session from such invocation. You can see the path and id in arguments are correct and stat() function returns correct values.
> Finally result in %rax is negative:
> rax            0xaf0b000701cc1d53       -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

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