Am Freitag, den 08.05.2015, 15:56 +0800 schrieb 罗勇刚(Yonggang Luo) :
> OK, I understand, cause the pst doesn't return, so the value in it
> doesn't matter.

I am not sure that I understand what you are saying, but you have to
see that implementing a standard C library has much less flexibility
than implementing your own interface. We have to exacly match the
requirements of the standard, and for this state variable they are
clear and precise: implement a static state per such function.

Jens

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