[Haskell-cafe] seeking advice on my POSIX wrapper

Galchin, Vasili vigalchin at gmail.com
Sat May 10 19:57:06 EDT 2008

The Linux version of mqueue that I am using is implemented as a Linux
filesystem. I am reading now, Brandon.


On Sat, May 10, 2008 at 4:09 PM, Brandon S. Allbery KF8NH <
allbery at ece.cmu.edu> wrote:

> On 2008 May 10, at 16:47, Galchin, Vasili wrote:
>      Last night I sent out an announcement about some POSIX work that I
> have been doing. In any case, one of the FFI wrappers is driving me crazy,
> i.e. the one for mq_receive:
> http://opengroup.org/onlinepubs/007908799/xsh/mq_receive.html  . When I
> call this function (mqReceive), I get "message too long". In my test cases I
> am sending and receiving messages that are only 11 bytes! The wrapper seems
> really straightforward. Perhaps  I am looking right at the problem and don't
> see. I need other eyes on the wrapper to help me ;^). Please see below.
> What's the other end sending?
> I suspect most implementations of mq_receive() layer it on top of msgrcv(),
> which can return E2BIG (== EMSGSIZE) if the message to be received is larger
> than the receiving buffer --- a condition which I note mq_receive() does not
> document (unless mq_msgsize means a given queue only supports fixed size
> messages, which seems odd).
> --
> brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery at kf8nh.com
> system administrator [openafs,heimdal,too many hats] allbery at ece.cmu.edu
> electrical and computer engineering, carnegie mellon university    KF8NH
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