BIO_DGRAM_CAP_HANDLES_SRC_ADDR
| BIO_DGRAM_CAP_HANDLES_SRC_ADDR
return (~readb->cap & (BIO_DGRAM_CAP_HANDLES_SRC_ADDR | BIO_DGRAM_CAP_PROVIDES_DST_ADDR)) == 0;
const uint32_t ref_caps = BIO_DGRAM_CAP_HANDLES_SRC_ADDR
int bio_caps = BIO_DGRAM_CAP_HANDLES_DST_ADDR | BIO_DGRAM_CAP_HANDLES_SRC_ADDR;