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From Yann Ylavic <ylavic....@gmail.com>
Subject Re: ftok (Was: Re: svn commit: r1561150 - /httpd/httpd/trunk/server/core.c)
Date Fri, 24 Jan 2014 23:00:01 GMT
According to the man (
http://pubs.opengroup.org/onlinepubs/009696899/functions/ftok.html), ftok()
uses only the low-order 8-bits of the id.
Maybe the APR could use the last char of the filename instead, so that the
users knows and can choose it.
For APR's internal/choosen filenames (if any), this byte could be generated
randomly.


On Fri, Jan 24, 2014 at 10:57 PM, Jim Jagielski <jim@jagunet.com> wrote:

> On httpd there was a discussion regarding versioning, and
> this got me thinking...
>
> Included in the APR 1.5.1 changes is an internal change
> to how apr_shm_create(), when using APR_USE_SHMEM_SHMGET,
> calculates the key (via ftok())...
>
> The problem (see the Bugz report) was that using the constant
> 1 would cause collisions, so I adjusted it to use a hash
> of the filename. The problem there is that any external
> APR users that needed to also determine the key needs to
> be aware of that. And from what I can see, there is no
> easy way to do that.
>
> So I will be pulling that from 2.0-dev and 1.5-dev until
> we can figure out a better way. Ideas appreciated.
>

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