BIO_DGRAM_CAP_PROVIDES_DST_ADDR
| BIO_DGRAM_CAP_PROVIDES_DST_ADDR
return (~readb->cap & (BIO_DGRAM_CAP_HANDLES_SRC_ADDR | BIO_DGRAM_CAP_PROVIDES_DST_ADDR)) == 0;
| BIO_DGRAM_CAP_PROVIDES_DST_ADDR;