F_SETLKW
cmd = F_SETLKW;
case F_SETLKW:
case F_SETLKW:
if (fcntl(fd, F_SETLKW, &lk) == 0) {
if (fcntl(fd, F_SETLKW, &lk) == 0) {
if (fcntl(fd, F_SETLKW, &lk) == 0) {
ret = fcntl(fd, F_SETLKW, &fl);
fcntl(lockdes, F_SETLKW, &lock);
fcntl(lockdes, F_SETLKW, &lock);