SNAP_CTL_PATH
if ((ctlfd = open(SNAP_CTL_PATH, O_RDONLY | O_EXCL)) == -1) {
die_perror(SNAP_CTL_PATH);
SNAP_CTL_PATH);
if ((ctlfd = open(SNAP_CTL_PATH, O_RDONLY | O_EXCL)) == -1)
die_perror(SNAP_CTL_PATH);
SNAP_CTL_PATH);