file descriptor limit in AIX 3.1

[rudy at chukran.austin.ibm.com]

Memory mapping files first becomes constrained by the number of
segment registers free.  The hardware for Risc System 6000
has 16, and 6 are already tied
up when your program starts, giving you 10 files which you can map
concurrently.  This is a result of file mapping being tied to the
shmat system call which uses a new segment register.

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