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message queue

Hi,

I am using red hat Linux 7.1 and imeplemening message
queue. But sometimes my server receives the message
sometimes not. I need some help about that.

1. What is the max message size that I can send
through message queue.
2. When server receives a message from a message queue
will it remove the message from the message quque?
3. when function call msgsnd, msgrecv return -1 that
means fail. Is there a way to debug what cause this
fail?
4. when client successfully send the message but
server does not receive the message what can be the
cause?
5. How to see the content of struct msqid_ds?

Thanks
Liton


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