Problem shmat in HP-UX. EINVAL Error - Programmers Heaven

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Problem shmat in HP-UX. EINVAL Error

I have a process that needs two active connections to the same zone of shared memory simultaneously.
The firs conection works ok, but when i do the second call to shmat it give me error 22 (EINVAL). Only works ok the second call to shmat if i disconnect the first connection (shmdt)
In Sun,AIX and Digital, i don
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