BLOCKS_FILENAME
(void)unlink(BLOCKS_FILENAME);
(void)unlink(BLOCKS_FILENAME);
fd = open(BLOCKS_FILENAME, O_CREAT | O_TRUNC | O_RDWR, 0600);
err(-1, "fill_blocks: open(%s)", BLOCKS_FILENAME);
(void)unlink(BLOCKS_FILENAME);
(void)unlink(BLOCKS_FILENAME);