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From: Szabolcs Nagy <nsz@port70.net>
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Subject: Re: SUN_LEN
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* Rich Felker <dalias@aerifal.cx> [2013-08-21 12:42:20 -0400]:
> > Declaring strlen is not easy because size_t is not defined. So I guess
> > we also need an additional #if before including bits/alltypes.h to
> > define __NEED_size_t...
> > 
> > This is why I thought a function might be less ugly.
> 
> Here's a sketch of what it could be:
> 
> static __inline unsigned long __SUN_LEN(struct sockaddr_un *__s)
> {
> 	unsigned long __i;
> 	for (__i=0; __s->sun_path[__i]; __i++);
> 	return __i+2;
> }
> #define SUN_LEN(s) __SUN_LEN(s)

you could include stddef.h, but this works as well