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Subject: Re: Help needed with libsigsegv2.10-2 + cygwin 2.4.1-1 + win7
To: cygwin@cygwin.com
References: <1458329766.2996.6.camel@linuxBox>
From: Marco Atzeri <marco.atzeri@gmail.com>
Message-ID: <56EC747F.2040306@gmail.com>
Date: Fri, 18 Mar 2016 22:34:55 +0100
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On 18/03/2016 20:36, ari kumpumäki wrote:
> Hi all
>
> Why the following test code works fluently in Linux and cygwin 1.5.
> But with cygwin 2.4.1 it gives a segmentation fault, when running "x =
> mem[filePageSize];"


>    return (char *) mmap(0, ALIGN_TO_PAGE_SIZE(size), PROT_NONE,
> MAP_SHARED | MAP_ANONYMOUS | MAP_NORESERVE, -1, 0);

why a file descriptor = -1 ?
http://pubs.opengroup.org/onlinepubs/9699919799/functions/mmap.html

Please note also that unsigned is not always same size of address
(eg 64 bit)

size_t works better for that.

In any case you should check the function result.

Regards
Marco

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