LOCK_EX
case LOCK_EX:
return flock(fd, LOCK_EX | LOCK_NB);
err = flock(map_fd, LOCK_EX);
if (flock(pid_file_handle, LOCK_EX|LOCK_NB) < 0) {
flock(nx_gzip_log->_fileno, LOCK_EX); \