_SS_MAXSIZE
#define _SS_PAD2SIZE (_SS_MAXSIZE - sizeof(unsigned char) - \
buf.buf = alloca(_SS_MAXSIZE);
buf.maxlen = _SS_MAXSIZE;
#define _SS_PADSIZE (_SS_MAXSIZE - sizeof (struct sockaddr))
#define _SS_PAD2SIZE (_SS_MAXSIZE - (sizeof (sa_family_t)+ \