BLOCKIF_SIG
assert(bc->bc_magic == BLOCKIF_SIG);
assert(bc->bc_magic == BLOCKIF_SIG);
assert(bc->bc_magic == BLOCKIF_SIG);
assert(bc->bc_magic == BLOCKIF_SIG);
assert(bc->bc_magic == BLOCKIF_SIG);
assert(bc->bc_magic == BLOCKIF_SIG);
assert(bc->bc_magic == BLOCKIF_SIG);
assert(bc->bc_magic == BLOCKIF_SIG);
bc->bc_magic = BLOCKIF_SIG;
assert(bc->bc_magic == BLOCKIF_SIG);
assert(bc->bc_magic == BLOCKIF_SIG);
assert(bc->bc_magic == BLOCKIF_SIG);
assert(bc->bc_magic == BLOCKIF_SIG);
assert(bc->bc_magic == BLOCKIF_SIG);