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From: Szabolcs Nagy <nsz@port70.net>
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Subject: Re: SUN_LEN
Date: Wed, 21 Aug 2013 16:45:52 +0200
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* ?$B>.NSM* <yukoba@gmail.com> [2013-08-21 22:27:22 +0900]:
> 
> So is this mean, you don't want to add glibc non-standard APIs to musl?

i think SUN_LEN can be added, but it should be under
_BSD_SOURCE because it violates the posix namespace

#if defined(_BSD_SOURCE) || defined(_GNU_SOURCE)
#define SUN_LEN(s) (sizeof *(s) - sizeof (s)->sun_path + strlen((s)->sun_path))
#endif