Messages in this thread | | | Date | Wed, 22 Dec 1999 13:57:40 +0800 | From | "Kevin Xie (Xie Huagang)" <> | Subject | Re: Strange piece of code |
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Giovanni Picoli Tirloni wrote:
> Hi, I was having a tour in the kernel sources and I found some codes > that I can't understand why. Like this in ppp: > > int > ppp_init (struct device *dev) > { > static int first_time = 1; <== define to 1 > int answer = 0;
^^^^^^^^^^^^^^^^^^^ static defined here!! look at a C programming Refrence.
> > > if (first_time) { <== check if is 1, why ? any special special reason? >
the first time this function be called , it is first=1 setted by the definition above. And the second time the function be called , first_time=0 setted below.
> first_time = 0; > answer = ppp_first_time(); > if (answer == 0) > (void) register_symtab (&ppp_syms); > } > if (answer == 0) > answer = -ENODEV; > return answer; > } > > I found many more codes like this in the source, I cant remeber where anymore.
Kevin Xie.
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