_PATH_LOCKFILE
lockfd = open(_PATH_LOCKFILE, O_CREAT|O_RDWR|O_EXLOCK|O_NONBLOCK, 0600);
err(1, "%s", _PATH_LOCKFILE);
lockfd = open(_PATH_LOCKFILE, O_CREAT|O_RDWR|O_EXLOCK|O_NONBLOCK, 0600);
err(1, "%s", _PATH_LOCKFILE);
lockfd = open(_PATH_LOCKFILE, O_CREAT|O_RDWR|O_EXLOCK|O_NONBLOCK, 0600);
err(1, "%s", _PATH_LOCKFILE);
lockfd = open(_PATH_LOCKFILE, O_CREAT|O_RDWR|O_EXLOCK|O_NONBLOCK, 0600);
err(1, "%s", _PATH_LOCKFILE);