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Message-id: <52EAA171.406@cygwin.com>
Date: Thu, 30 Jan 2014 14:01:05 -0500
From: "Larry Hall (Cygwin)" <reply-to-list-only-lh AT cygwin DOT com>
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To: cygwin AT cygwin DOT com
Subject: Re: second call to mmap() results in error
References: <20140129181250 DOT GW2821 AT calimero DOT vinschen DOT de> <52E95786 DOT 8050606 AT gmail DOT com> <20140130095822 DOT GY2821 AT calimero DOT vinschen DOT de> <001801cf1db6$66c47c40$344d74c0$@lbmsys.com> <20140130124558 DOT GA2821 AT calimero DOT vinschen DOT de> <003801cf1dbd$fc3ffc70$f4bff550$@lbmsys.com> <20140130170142 DOT GD2821 AT calimero DOT vinschen DOT de> <5F8AAC04F9616747BC4CC0E803D5907D0C4763CC AT MLBXv04 DOT nih DOT gov> <52EA9A53 DOT 2050203 AT cygwin DOT com> <5F8AAC04F9616747BC4CC0E803D5907D0C4764C5 AT MLBXv04 DOT nih DOT gov> <20140130183956 DOT GA3573 AT ednor DOT casa DOT cgf DOT cx> <5F8AAC04F9616747BC4CC0E803D5907D0C4764ED AT MLBXv04 DOT nih DOT gov> <52EA9EA2 DOT 5030202 AT cygwin DOT com> <5F8AAC04F9616747BC4CC0E803D5907D0C476528 AT MLBXv04 DOT nih DOT gov>
In-reply-to: <5F8AAC04F9616747BC4CC0E803D5907D0C476528@MLBXv04.nih.gov>

On 1/30/2014 1:52 PM, Lavrentiev, Anton (NIH/NLM/NCBI) [C] wrote:
>> Try adding -Wall to your compile line.
>
> I did.  There was no warning (and it should not have because
> #include <sys/mman.h> is there).  Why <unistd.h> ?  It's not
> needed to compile and run the original code.

Forget mmap().  That's not the issue here.  It's ftruncate()
which is declared in unistd.h.  If 'gcc -Wall -o foo foo.c',
where foo.c is Steve's code from the link below, doesn't result
in a

foo.c:18:28: error: ‘ftruncate’ was not declared in this scope
    ftruncate(shm_fd1, 524304);

complaint, then I'd say you need to send a full problem report if
you can't find a good reason for that behavior in your environment -
<http://cygwin.com/problems.html>

<http://cygwin.com/ml/cygwin/2014-01/msg00518.html>


-- 
Larry

_____________________________________________________________________

A: Yes.
 > Q: Are you sure?
 >> A: Because it reverses the logical flow of conversation.
 >>> Q: Why is top posting annoying in email?

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