On Sat, May 10, 2008 at 4:09 PM, Brandon S. Allbery KF8NH <allbery@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@kf8nh.com

system administrator [openafs,heimdal,too many hats] allbery@ece.cmu.edu

electrical and computer engineering, carnegie mellon university KF8NH